added /sys/doc

32 files changed, 40137 insertions, 0 deletions

diff --git a/sys/doc/sam/fig1.bm b/sys/doc/sam/fig1.bm
new file mode 100644
index 000000000..7f5e63a7c
--- /dev/null
+++ b/sys/doc/sam/fig1.bm
diff --git a/sys/doc/sam/fig1.gif b/sys/doc/sam/fig1.gif
new file mode 100644
index 000000000..b540c6694
--- /dev/null
+++ b/sys/doc/sam/fig1.gif
diff --git a/sys/doc/sam/fig1.png b/sys/doc/sam/fig1.png
new file mode 100644
index 000000000..fe1a83e21
--- /dev/null
+++ b/sys/doc/sam/fig1.png
diff --git a/sys/doc/sam/fig1.ps b/sys/doc/sam/fig1.ps
new file mode 100644
index 000000000..6c18c63a7
--- /dev/null
+++ b/sys/doc/sam/fig1.ps
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diff --git a/sys/doc/sam/fig5.pic b/sys/doc/sam/fig5.pic
new file mode 100644
index 000000000..67ecd8abc
--- /dev/null
+++ b/sys/doc/sam/fig5.pic
@@ -0,0 +1,27 @@
+.PS
+scale=100
+define m0 |
+[
+$2: box "\f(CWBuffer\fP" $1 ht 40 wid 88 with .nw at 0,40 
+box "\f(CWString\fP" "(cache)" ht 40 wid 72 with .nw at 104,40 
+line left 16 from last box.w
+] |
+
+define m1 |
+[
+box "\f(CWDisc\fP" ht 40 wid 88 with .sw at 0,56
+box "temp. file" ht 40 wid 88 with .sw at 0,0
+line up 16 from last box.n
+] |
+
+D1: m1 with .nw at 184,576
+D2: m1 with .nw at 0,576
+Mtranscript: m0("(transcript)", Buffer) with .nw at 0,640
+Mcontents: m0("(contents)", Contents) with .nw at 184,640
+F: box "\f(CWFile\fP" ht 40 wid 112 with .nw at 75,704 
+
+line from D2.n to Mtranscript.Buffer.s
+line from D1.n to Mcontents.Contents.s
+line up 12 from Mtranscript.Buffer.n then right 50 then up 12
+line up 12 from Mcontents.Contents.n then left 60 then up 12
+.PE
diff --git a/sys/doc/sam/fig6.pic b/sys/doc/sam/fig6.pic
new file mode 100644
index 000000000..52ac9a045
--- /dev/null
+++ b/sys/doc/sam/fig6.pic
@@ -0,0 +1,38 @@
+.PS
+scale=100
+
+T: box "\f(CWText\fP" ht 40 wid 112
+R: box "\f(CWRasp\fP" ht 40 wid 90 with .w at (T.e.x+16, T.e.y)
+
+line from T.e to R.w
+arrow from R.e right 24
+box invis "to host" with .w at end of last arrow
+
+line from T.s down 16 then left 30 then down 30 then right 16
+
+FL: box "\f(CWFlayer\fP" ht 40 wid 75 with .w at end of last line
+F1: box                  ht 40 wid 75 with .w at FL.e
+F2: box                  ht 40 wid 75 with .w at F1.e
+F3: box "\&\f(CW...\fP"  ht 40 wid 75 with .w at F2.e
+
+FX: box invis "\f(CW...\fP" ht 40 wid 75 with .n at (F1.s.x, F1.s.y-24)
+
+FR: box "\f(CWFrame\fP" ht 40 wid 75 with .n at (FL.s.x, FL.s.y-24)
+
+line from FL.s to FR.n
+line from F1.s down 24
+line from F2.s down 24
+line from F3.s down 24
+
+BM: box "\f(CWBitmap\fP" "(cache)" ht 40 wid 68 with .e at (FR.w.x-28, FR.w.y)
+
+line from BM.e to FR.w
+
+line from FR.s down 16 then left 50 then down 30 then right 16
+
+B1: box "\f(CWBox\fP"   ht 40 wid 45 with .w at end of last line
+B2: box 		ht 40 wid 45 with .w at B1.e
+B3: box 		ht 40 wid 45 with .w at B2.e
+B4: box "\f(CW...\fP"	ht 40 wid 45 with .w at B3.e
+
+.PE
diff --git a/sys/doc/sam/fig7.pic b/sys/doc/sam/fig7.pic
new file mode 100644
index 000000000..840eac782
--- /dev/null
+++ b/sys/doc/sam/fig7.pic
@@ -0,0 +1,12 @@
+.PS
+scale=100
+
+tw=15
+
+T1: box ht tw wid 80
+T2: box "\f(CW\s8for(i=0; i<NL; i++){\s0\fP" ht tw wid 166 with .w at T1.e
+T3: box ht tw wid 60 with .w at T2.e
+T4: box "\f(CW\s8/* for each element */\s0\fP" ht tw wid 186 with .w at T3.e
+T5: box ht tw wid 50
+
+.PE
diff --git a/sys/doc/sam/mkfile b/sys/doc/sam/mkfile
new file mode 100644
index 000000000..26de1d431
--- /dev/null
+++ b/sys/doc/sam/mkfile
@@ -0,0 +1,19 @@
+</sys/doc/fonts
+
+default:V: sam.ps sam.tut.out
+
+sam.ps:D:	sam.ms fig1.ps fig2.ps fig3.ps fig4.ps fig5.pic fig6.pic fig7.pic refs
+	{echo $FONTS; cat sam.ms refs} | pic | tbl | troff -ms -mpictures | lp -dstdout >sam.ps
+	../cleanps sam.ps
+
+sam.trout:D:	sam.ms fig1.ps fig2.ps fig3.ps fig4.ps fig5.pic fig6.pic fig7.pic refs
+	{echo $FONTS; cat sam.ms refs} | pic | tbl | troff -ms -mpictures >sam.trout
+
+sam.html:D:	sam.ms fig1.ps fig2.ps fig3.ps fig4.ps fig5.pic fig6.pic fig7.pic refs
+	pic sam.ms refs | tbl | htmlroff -ms -mhtml >sam.html
+
+sam.tut.out:D:	sam.tut
+	troff -ms sam.tut > sam.tut.out
+
+clean:V:
+	rm -f sam.ps
diff --git a/sys/doc/sam/refs b/sys/doc/sam/refs
new file mode 100644
index 000000000..d50b062db
--- /dev/null
+++ b/sys/doc/sam/refs
@@ -0,0 +1,166 @@
+.SH
+REFERENCES
+.PP
+.nr PI \w'20. 'u
+.IP \01. 
+R. Pike,
+`The Blit: a multiplexed graphics terminal,'
+.I
+AT&T Bell Labs. Tech. J.,
+.R
+.B 63 ,
+(8),
+1607-1631 (1984).
+.IP \02. 
+L. Johnson,
+.I MacWrite,
+Apple Computer Inc., Cupertino, Calif. 1983.
+.IP \03. 
+B. Lampson,
+`Bravo Manual,'
+in
+.I
+Alto User's Handbook,
+.R
+pp. 31-62,
+Xerox Palo Alto Research Center,
+Palo Alto, Calif.
+1979.
+.IP \04. 
+W. Teitelman,
+`A tour through Cedar,'
+.I
+IEEE Software,
+.R
+.B 1
+(2), 44-73 (1984).
+.IP \05. 
+J. Gutknecht,
+`Concepts of the text editor Lara,'
+.I
+Comm. ACM,
+.R
+.B 28 ,
+(9),
+942-960 (1985).
+.IP \06. 
+Bell Telephone Laboratories,
+.I
+UNIX Programmer's Manual,
+.R
+Holt, Rinehart and Winston, New York 1983.
+.IP \07. 
+B. W. Kernighan and R. Pike,
+.I
+The Unix Programming Environment,
+.R
+Prentice-Hall, Englewood Cliffs, New Jersey 1984.
+.IP \08. 
+.I
+Unix Time-Sharing System Programmer's Manual, Research Version, Ninth Edition,
+Volume 1,
+.R
+AT&T Bell Laboratories, Murray Hill, New Jersey 1986.
+.IP \09. 
+.I
+Unix Time-Sharing System Programmer's Manual, 4.1 Berkeley Software Distribution,
+Volumes 1 and 2C,
+.R
+University of California, Berkeley, Calif. 1981.
+.IP 10. 
+R. Pike,
+`Structural Regular Expressions,'
+.I
+Proc. EUUG Spring Conf., Helsinki 1987,
+.R
+Eur. Unix User's Group, Buntingford, Herts, UK 1987.
+.IP 11. 
+A. Goldberg,
+.I
+Smalltalk-80 \(en The Interactive Programming Environment,
+.R
+Addison-Wesley, Reading, Mass. 1984.
+.IP 12. 
+K. Thompson,
+`Regular expression search algorithm,'
+.I
+Comm. ACM,
+.R
+.B 11 ,
+(6),
+419-422 (1968).
+.IP 13. 
+A. V. Aho, J. E. Hopcroft and J. D. Ullman,
+.I
+The Design and Analysis of Computer Algorithms,
+.R
+Addison-Wesley, Reading, Mass. 1974.
+.IP 14. 
+B. W. Kernighan and D. M. Ritchie,
+.I
+The C Programming Language,
+.R
+Prentice-Hall, Englewood Cliffs, New Jersey 1978.
+.IP 15. 
+W. M. Waite,
+`The cost of lexical analysis,'
+.I
+Softw. Pract. Exp.,
+.R
+.B 16 ,
+(5),
+473-488 (1986).
+.IP 16. 
+C. W. Fraser,
+`A generalized text editor,'
+.I
+Comm. ACM,
+.R
+.B 23 ,
+(3),
+154-158 (1980).
+.IP 17. 
+R. Pike,
+`Graphics in overlapping bitmap layers,'
+.I
+ACM Trans. on Graph.,
+.R
+.B 2 ,
+(2)
+135-160 (1983).
+.IP 18. 
+L. J. Guibas and J. Stolfi,
+`A language for bitmap manipulation,'
+.I
+ACM Trans. on Graph.,
+.R
+.B 1 ,
+(3),
+191-214 (1982).
+.IP 19. 
+R. Pike, B. Locanthi and J. Reiser,
+`Hardware/software trade-offs for bitmap graphics on the Blit,'
+.I
+Softw. Pract. Exp.,
+.R
+.B 15 ,
+(2),
+131-151 (1985).
+.IP 20. 
+T. A. Cargill,
+`The feel of Pi,'
+.I
+Winter USENIX Conference Proceedings,
+Denver 1986,
+.R
+62-71,
+USENIX Assoc., El Cerrito, CA.
+.IP 21. 
+G. J. Holzmann,
+`Tracing protocols,'
+.I
+AT&T Tech. J.,
+.R
+.B 64 ,
+(10),
+2413-2434 (1985).
diff --git a/sys/doc/sam/sam.html b/sys/doc/sam/sam.html
new file mode 100644
index 000000000..e7bda43b6
--- /dev/null
+++ b/sys/doc/sam/sam.html
@@ -0,0 +1,3705 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+"http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<meta http-equiv=Content-Type content="text/html; charset=utf8">
+<title>The Text Editor sam</title>
+</meta>
+</head>
+<body>
+<p style="margin-top: 0; margin-bottom: 0.50in"></p>
+<p style="margin-top: 0; margin-bottom: 0.21in"></p>
+
+<p style="line-height: 1.4em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: center;">
+<span style="font-size: 12pt"><b>The Text Editor </b></span><span style="font-size: 12pt"><tt>sam</tt></span><span style="font-size: 12pt"><b></b></span></p>
+<p style="margin-top: 0; margin-bottom: 0.21in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.4em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: center;">
+<span style="font-size: 10pt"><i>Rob Pike</i></span></p>
+<p style="line-height: 1.4em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: center;">
+<span style="font-size: 10pt"><i>rob@plan9.bell-labs.com</i></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="margin-top: 0; margin-bottom: 0.33in"></p>
+<p style="line-height: 1.4em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: center;">
+<span style="font-size: 10pt"><i>ABSTRACT</i></span></p>
+<p style="margin-top: 0; margin-bottom: 0.19in"></p>
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.50in; text-indent: 0.50in; margin-right: 1.50in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is an interactive multi-file text editor intended for
+bitmap displays.
+A textual command language
+supplements the mouse-driven, cut-and-paste interface
+to make complex or
+repetitive editing tasks easy to specify.
+The language is characterized by the composition of regular expressions
+to describe the structure of the text being modified.
+The treatment of files as a database, with changes logged
+as atomic transactions, guides the implementation and
+makes a general &lsquo;undo&rsquo; mechanism straightforward.
+</span><span style="font-size: 10pt"></span><span style="font-size: 10pt"></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.50in; text-indent: 0.35in; margin-right: 1.50in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is implemented as two processes connected by a low-bandwidth stream,
+one process handling the display and the other the editing
+algorithms.  Therefore it can run with the display process
+in a bitmap terminal and the editor on a local host,
+with both processes on a bitmap-equipped host, or with
+the display process in the terminal and the editor in a
+remote host.
+By suppressing the display process,
+it can even run without a bitmap terminal.
+</span><span style="font-size: 10pt"></span><span style="font-size: 10pt"></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.50in; text-indent: 0.35in; margin-right: 1.50in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">This paper is reprinted from Software&mdash;Practice and Experience,
+Vol 17, number 11, pp. 813-845, November 1987.
+The paper has not been updated for the Plan 9 manuals.  Although
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+has not changed much since the paper was written, the system around it certainly has.
+Nonetheless, the description here still stands as the best introduction to the editor.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.50in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Introduction
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is an interactive text editor that combines cut-and-paste interactive editing with
+an unusual command language based on the composition of regular expressions.
+It is written as two programs: one, the &lsquo;host part,&rsquo; runs on a UNIX system
+and implements the command language and provides file access; the other, the
+&lsquo;terminal part,&rsquo; runs asynchronously
+on a machine with a mouse and bitmap display
+and supports the display and interactive editing.
+The host part may be even run in isolation on an ordinary terminal
+to edit text using the command
+language, much like a traditional line editor,
+without assistance from a mouse or display.
+Most often,
+the terminal part runs on a Blit<sup></sup></span><sup><span style="font-size: 6pt">1</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt"> terminal
+(actually on a Teletype DMD 5620, the production version of the Blit), whose
+host connection is an ordinary 9600 bps RS232 link;
+on the SUN computer the host and display processes run on a single machine,
+connected by a pipe.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+edits uninterpreted
+ASCII text.
+It has no facilities for multiple fonts, graphics or tables,
+unlike MacWrite,<sup></sup></span><sup><span style="font-size: 6pt">2</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt"> Bravo,<sup></sup></span><sup><span style="font-size: 6pt">3</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt"> Tioga<sup></sup></span><sup><span style="font-size: 6pt">4</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+or Lara.<sup></sup></span><sup><span style="font-size: 6pt">5</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+Also unlike them, it has a rich command language.
+(Throughout this paper, the phrase
+</span><span style="font-size: 10pt"><i>command language
+</i></span><span style="font-size: 10pt">refers to
+textual commands; commands activated from the mouse form the
+</span><span style="font-size: 10pt"><i>mouse</i></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><i>language.</i></span><span style="font-size: 10pt">)
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+developed as an editor for use by programmers, and tries to join
+the styles of the UNIX text editor
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt"><sup></sup></span><sup><span style="font-size: 6pt">6,7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+with that of interactive cut-and-paste editors by
+providing a comfortable mouse-driven interface
+to a program with a solid command language driven by regular expressions.
+The command language developed more than the mouse language, and
+acquired a notation for describing the structure of files
+more richly than as a sequence of lines,
+using a dataflow-like syntax for specifying changes.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The interactive style was influenced by
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">1</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+an early cut-and-paste editor for the Blit, and by
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">8</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+the Blit window system.
+</span><span style="font-size: 10pt"><tt>Mux</tt></span><span style="font-size: 10pt">
+merges the original Blit window system,
+</span><span style="font-size: 10pt"><tt>mpx</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">1</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+with cut-and-paste editing, forming something like a
+multiplexed version of
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+that edits the output of (and input to) command sessions rather than files.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The first part of this paper describes the command language, then the mouse
+language, and explains how they interact.
+That is followed by a description of the implementation,
+first of the host part, then of the terminal part.
+A principle that influenced the design of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is that it should have no explicit limits, such as upper limits on
+file size or line length.
+A secondary consideration is that it be efficient.
+To honor these two goals together requires a method for efficiently
+manipulating
+huge strings (files) without breaking them into lines,
+perhaps while making thousands of changes
+under control of the command language.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">&rsquo;s
+method is to
+treat the file as a transaction database, implementing changes as atomic
+updates.  These updates may be unwound easily to &lsquo;undo&rsquo; changes.
+Efficiency is achieved through a collection of caches that minimizes
+disc traffic and data motion, both within the two parts of the program
+and between them.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The terminal part of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is fairly straightforward.
+More interesting is how the two halves of the editor stay
+synchronized when either half may initiate a change.
+This is achieved through a data structure that organizes the
+communications and is maintained in parallel by both halves.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The last part of the paper chronicles the writing of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+and discusses the lessons that were learned through its development and use.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The paper is long, but is composed largely of two papers of reasonable length:
+a description of the user interface of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+and a discussion of its implementation.
+They are combined because the implementation is strongly influenced by
+the user interface, and vice versa.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>The Interface
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is a text editor for multiple files.
+File names may be provided when it is invoked:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>sam file1 file2 ...</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">and there are commands
+to add new files and discard unneeded ones.
+Files are not read until necessary
+to complete some command.
+Editing operations apply to an internal copy
+made when the file is read; the UNIX file associated with the copy
+is changed only by an explicit command.
+To simplify the discussion, the internal copy is here called a
+</span><span style="font-size: 10pt"><i>file</i></span><span style="font-size: 10pt">,
+while the disc-resident original is called a
+</span><span style="font-size: 10pt"><i>disc file.
+</i></span><span style="font-size: 10pt"></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is usually connected to a bitmap display that presents a cut-and-paste
+editor driven by the mouse.
+In this mode, the command language is still available:
+text typed in a special window, called the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><i>window,</i></span><span style="font-size: 10pt">
+is interpreted
+as commands to be executed in the current file.
+Cut-and-paste editing may be used in any window &mdash; even in the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window to construct commands.
+The other mode of operation, invoked by starting
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+with the option
+</span><span style="font-size: 10pt"><tt>-d</tt></span><span style="font-size: 10pt">
+(for &lsquo;no download&rsquo;),
+does not use the mouse or bitmap display, but still permits
+editing using the textual command language, even on an ordinary terminal,
+interactively or from a script.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The following sections describe first the command language (under
+</span><span style="font-size: 10pt"><tt>sam\fP-d
+and in the
+</tt></span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt"><tt>
+window), and then the mouse interface.
+These two languages are nearly independent, but connect through the
+</tt></span><span style="font-size: 10pt"><i>current</i></span><span style="font-size: 10pt"><tt>
+</tt></span><span style="font-size: 10pt"><i>text,</i></span><span style="font-size: 10pt"><tt>
+described below.
+</tt></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>The Command Language
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A file consists of its contents, which are an array of characters
+(that is, a string); the
+</span><span style="font-size: 10pt"><i>name</i></span><span style="font-size: 10pt">
+of the associated disc file; the
+</span><span style="font-size: 10pt"><i>modified bit
+</i></span><span style="font-size: 10pt">that states whether the contents match those of
+the disc file;
+and a substring of the contents, called the
+</span><span style="font-size: 10pt"><i>current text
+</i></span><span style="font-size: 10pt">or
+</span><span style="font-size: 10pt"><i>dot</i></span><span style="font-size: 10pt">
+(see Figures 1 and 2).
+If the current text is a null string, dot falls between characters.
+The
+</span><span style="font-size: 10pt"><i>value</i></span><span style="font-size: 10pt">
+of dot is the location of the current text; the
+</span><span style="font-size: 10pt"><i>contents</i></span><span style="font-size: 10pt">
+of dot are the characters it contains.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+imparts to the text no two-dimensional interpretation such as columns
+or fields; text is always one-dimensional.
+Even the idea of a &lsquo;line&rsquo; of text as understood by most UNIX programs
+&mdash; a sequence of characters terminated by a newline character &mdash;
+is only weakly supported.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><i>current file
+</i></span><span style="font-size: 10pt">is the file to which editing commands refer.
+The current text is therefore dot in the current file.
+If a command doesn&rsquo;t explicitly name a particular file or piece of text,
+the command is assumed to apply to the current text.
+For the moment, ignore the presence of multiple files and consider
+editing a single file.
+</span><span style="font-size: 10pt"></span></p><center><img src="fig1.gif" /></center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 1. A typical
+</i></span><span style="font-size: 8pt"><tt>sam</tt></span><span style="font-size: 8pt"><i>
+screen, with the editing menu presented.
+The
+</i></span><span style="font-size: 8pt"><tt>sam</tt></span><span style="font-size: 8pt"><i>
+(command language) window is in the middle, with file windows above and below.
+(The user interface makes it easy to create these abutting windows.)
+The partially obscured window is a third file window.
+The uppermost window is that to which typing and mouse operations apply,
+as indicated by its heavy border.
+Each window has its current text highlighted in reverse video.
+The
+</i></span><span style="font-size: 8pt"><tt>sam</tt></span><span style="font-size: 8pt"><i>
+window&rsquo;s current text is the null string on the last visible line,
+indicated by a vertical bar.
+See also Figure 2.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Commands have one-letter names.
+Except for non-editing commands such as writing
+the file to disc, most commands make some change
+to the text in dot and leave dot set to the text resulting from the change.
+For example, the delete command,
+</span><span style="font-size: 10pt"><tt>d</tt></span><span style="font-size: 10pt">,
+deletes the text in dot, replacing it by the null string and setting dot
+to the result.
+The change command,
+</span><span style="font-size: 10pt"><tt>c</tt></span><span style="font-size: 10pt">,
+replaces dot by text delimited by an arbitrary punctuation character,
+conventionally
+a slash.  Thus,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>c/Peter/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces the text in dot by the string
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">.
+Similarly,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>a/Peter/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(append) adds the string after dot, and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>i/Peter/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(insert) inserts before dot.
+All three leave dot set to the new text,
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Newlines are part of the syntax of commands:
+the newline character lexically terminates a command.
+Within the inserted text, however, newlines are never implicit.
+But since it is often convenient to insert multiple lines of text,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+has a special
+syntax for that case:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>a</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>some lines of text</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>to be inserted in the file,</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>terminated by a period</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>on a line by itself</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>.</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">In the one-line syntax, a newline character may be specified by a C-like
+escape, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>c/\n/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces dot by a single newline character.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+also has a substitute command,
+</span><span style="font-size: 10pt"><tt>s</tt></span><span style="font-size: 10pt">:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>s/</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>/</tt></span><span style="font-size: 9pt"><i>replacement</i></span><span style="font-size: 9pt"><tt>/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">substitutes the replacement text for the first match, in dot,
+of the regular expression.
+Thus, if dot is the string
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">,
+the command
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>s/t/st/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">changes it to
+</span><span style="font-size: 10pt"><tt>Pester</tt></span><span style="font-size: 10pt">.
+In general,
+</span><span style="font-size: 10pt"><tt>s</tt></span><span style="font-size: 10pt">
+is unnecessary, but it was inherited from
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+and it has some convenient variations.
+For instance, the replacement text may include the matched text,
+specified by
+</span><span style="font-size: 10pt"><tt>&amp;</tt></span><span style="font-size: 10pt">:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>s/Peter/Oh, &amp;, &amp;, &amp;, &amp;!/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">There are also three commands that apply programs
+to text:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>&lt; </tt></span><span style="font-size: 9pt"><i>UNIX program</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces dot by the output of the UNIX program.
+Similarly, the
+</span><span style="font-size: 10pt"><tt>&gt;</tt></span><span style="font-size: 10pt">
+command
+runs the program with dot as its standard input, and
+</span><span style="font-size: 10pt"><tt>|</tt></span><span style="font-size: 10pt">
+does both.  For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>| sort</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces dot by the result of applying the standard sorting utility to it.
+Again, newlines have no special significance for these
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+commands.
+The text acted upon and resulting from these commands is not necessarily
+bounded by newlines, although for connection with UNIX programs,
+newlines may be necessary to obey conventions.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">One more command:
+</span><span style="font-size: 10pt"><tt>p</tt></span><span style="font-size: 10pt">
+prints the contents of dot.
+Table I summarizes
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+commands.
+</span><span style="font-size: 10pt"></span></p><center><img src="sam0.png"></center>
+</center>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The value of dot may be changed by
+specifying an
+</span><span style="font-size: 10pt"><i>address</i></span><span style="font-size: 10pt">
+for the command.
+The simplest address is a line number:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>3</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">refers to the third line of the file, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>3d</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">deletes the third line of the file, and implicitly renumbers
+the lines so the old line 4 is now numbered 3.
+(This is one of the few places where
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+deals with lines directly.)
+Line
+</span><span style="font-size: 10pt"><tt>0</tt></span><span style="font-size: 10pt">
+is the null string at the beginning of the file.
+If a command consists of only an address, a
+</span><span style="font-size: 10pt"><tt>p</tt></span><span style="font-size: 10pt">
+command is assumed, so typing an unadorned
+</span><span style="font-size: 10pt"><tt>3</tt></span><span style="font-size: 10pt">
+prints line 3 on the terminal.
+There are a couple of other basic addresses:
+a period addresses dot itself; and
+a dollar sign
+(</span><span style="font-size: 10pt"><tt>$</tt></span><span style="font-size: 10pt">)
+addresses the null string at the end of the file.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">An address is always a single substring of the file.
+Thus, the address
+</span><span style="font-size: 10pt"><tt>3</tt></span><span style="font-size: 10pt">
+addresses the characters
+after the second newline of
+the file through the third newline of the file.
+A
+</span><span style="font-size: 10pt"><i>compound address
+</i></span><span style="font-size: 10pt">is constructed by the comma operator
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><i>address1</i></span><span style="font-size: 9pt"><tt>,</tt></span><span style="font-size: 9pt"><i>address2</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">and addresses the substring of the file from the beginning of
+</span><span style="font-size: 10pt"><i>address1</i></span><span style="font-size: 10pt">
+to the end of
+</span><span style="font-size: 10pt"><i>address2</i></span><span style="font-size: 10pt">.
+For example, the command
+</span><span style="font-size: 10pt"><tt>3,5p</tt></span><span style="font-size: 10pt">
+prints the third through fifth lines of the file and
+</span><span style="font-size: 10pt"><tt>.,$d</tt></span><span style="font-size: 10pt">
+deletes the text from the beginning of dot to the end of the file.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">These addresses are all absolute positions in the file, but
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+also has relative addresses, indicated by
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>-</tt></span><span style="font-size: 10pt">.
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>$-3</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">is the third line before the end of the file and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>.+1</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">is the line after dot.
+If no address appears to the left of the
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>-</tt></span><span style="font-size: 10pt">,
+dot is assumed;
+if nothing appears to the right,
+</span><span style="font-size: 10pt"><tt>1</tt></span><span style="font-size: 10pt">
+is assumed.
+Therefore,
+</span><span style="font-size: 10pt"><tt>.+1</tt></span><span style="font-size: 10pt">
+may be abbreviated to just a plus sign.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+operator acts relative to the end of its first argument, while the
+</span><span style="font-size: 10pt"><tt>-</tt></span><span style="font-size: 10pt">
+operator acts relative to the beginning.  Thus
+</span><span style="font-size: 10pt"><tt>.+1</tt></span><span style="font-size: 10pt">
+addresses the first line after dot,
+</span><span style="font-size: 10pt"><tt>.-</tt></span><span style="font-size: 10pt">
+addresses the first line before dot, and
+</span><span style="font-size: 10pt"><tt>+-</tt></span><span style="font-size: 10pt">
+refers to the line containing the end of dot.  (Dot may span multiple lines, and
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+selects the line after the end of dot, then
+</span><span style="font-size: 10pt"><tt>-</tt></span><span style="font-size: 10pt">
+backs up one line.)
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The final type of address is a regular expression, which addresses the
+text matched by the expression.  The expression is enclosed in slashes, as in
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>/</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The expressions are the same as those in the UNIX program
+</span><span style="font-size: 10pt"><tt>egrep</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">6,7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+and include closures, alternations, and so on.
+They find the
+</span><span style="font-size: 10pt"><i>leftmost longest
+</i></span><span style="font-size: 10pt">string that matches the expression, that is,
+the first match after the point where the search is started,
+and if more than one match begins at the same spot, the longest such match.
+(I assume familiarity with the syntax for regular expressions in UNIX programs.<sup></sup></span><sup><span style="font-size: 6pt">9</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">)
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>/x/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">matches the next
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+character in the file,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>/xx*/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">matches the next run of one or more
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">&rsquo;s,
+and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>/x|Peter/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">matches the next
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">.
+For compatibility with other UNIX programs, the &lsquo;any character&rsquo; operator,
+a period,
+does not match a newline, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>/.*/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">matches the text from dot to the end of the line, but excludes the newline
+and so will not match across
+the line boundary.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Regular expressions are always relative addresses.
+The direction is forwards by default,
+so
+</span><span style="font-size: 10pt"><tt>/Peter/</tt></span><span style="font-size: 10pt">
+is really an abbreviation for
+</span><span style="font-size: 10pt"><tt>+/Peter/</tt></span><span style="font-size: 10pt">.
+The search can be reversed with a minus sign, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt></tt></span><span style="font-size: 9pt"><tt>-/Peter/</tt></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">finds the first
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">
+before dot.
+Regular expressions may be used with other address forms, so
+</span><span style="font-size: 10pt"><tt>0+/Peter/</tt></span><span style="font-size: 10pt">
+finds the first
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">
+in the file and
+</span><span style="font-size: 10pt"><tt>$-/Peter/</tt></span><span style="font-size: 10pt">
+finds the last.
+Table II summarizes
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+addresses.
+</span><span style="font-size: 10pt"></span></p><center><img src="sam1.png"></center>
+</center>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The language discussed so far will not seem novel
+to people who use UNIX text editors
+such as
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>vi</tt></span><span style="font-size: 10pt">.<sup></sup></span><sup><span style="font-size: 6pt">9</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+Moreover, the kinds of editing operations these commands allow, with the exception
+of regular expressions and line numbers,
+are clearly more conveniently handled by a mouse-based interface.
+Indeed,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+mouse language (discussed at length below) is the means by which
+simple changes are usually made.
+For large or repetitive changes, however, a textual language
+outperforms a manual interface.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Imagine that, instead of deleting just one occurrence of the string
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">,
+we wanted to eliminate every
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">.
+What&rsquo;s needed is an iterator that runs a command for each occurrence of some
+text.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">&rsquo;s
+iterator is called
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">,
+for extract:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>x/</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>/ </tt></span><span style="font-size: 9pt"><i>command</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">finds all matches in dot of the specified expression, and for each
+such match, sets dot to the text matched and runs the command.
+So to delete all the
+</span><span style="font-size: 10pt"><tt>Peters:</tt></span><span style="font-size: 10pt">
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>0,$ x/Peter/ d</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(Blanks in these examples are to improve readability;
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+neither requires nor interprets them.)
+This searches the entire file
+(</span><span style="font-size: 10pt"><tt>0,$</tt></span><span style="font-size: 10pt">)
+for occurrences of the string
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">,
+and runs the
+</span><span style="font-size: 10pt"><tt>d</tt></span><span style="font-size: 10pt">
+command with dot set to each such occurrence.
+(By contrast, the comparable
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+command would delete all
+</span><span style="font-size: 10pt"><i>lines</i></span><span style="font-size: 10pt">
+containing
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">;
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+deletes only the
+</span><span style="font-size: 10pt"><tt>Peters</tt></span><span style="font-size: 10pt">.)
+The address
+</span><span style="font-size: 10pt"><tt>0,$</tt></span><span style="font-size: 10pt">
+is commonly used, and may be abbreviated to just a comma.
+As another example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/Peter/ p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">prints a list of
+</span><span style="font-size: 10pt"><tt>Peters,</tt></span><span style="font-size: 10pt">
+one for each appearance in the file, with no intervening text (not even newlines
+to separate the instances).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Of course, the text extracted by
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+may be selected by a regular expression,
+which complicates deciding what set of matches is chosen &mdash;
+matches may overlap.  This is resolved by generating the matches
+starting from the beginning of dot using the leftmost-longest rule,
+and searching for each match starting from the end of the previous one.
+Regular expressions may also match null strings, but a null match
+adjacent to a non-null match is never selected; at least one character
+must intervene.
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, c/AAA/</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>x/B*/ c/-/</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">produces as output
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>-A-A-A-</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">because the pattern
+</span><span style="font-size: 10pt"><tt>B*</tt></span><span style="font-size: 10pt">
+matches the null strings separating the
+</span><span style="font-size: 10pt"><tt>A</tt></span><span style="font-size: 10pt">&rsquo;s.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command has a complement,
+</span><span style="font-size: 10pt"><tt>y</tt></span><span style="font-size: 10pt">,
+with similar syntax, that executes the command with dot set to the text
+</span><span style="font-size: 10pt"><i>between</i></span><span style="font-size: 10pt">
+the matches of the expression.
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, c/AAA/</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>y/A/ c/-/</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">produces the same result as the example above.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>y</tt></span><span style="font-size: 10pt">
+commands are looping constructs, and
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+has a pair of conditional commands to go with them.
+They have similar syntax:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>g/</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>/ </tt></span><span style="font-size: 9pt"><i>command</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(guard)
+runs the command exactly once if dot contains a match of the expression.
+This is different from
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">,
+which runs the command for
+</span><span style="font-size: 10pt"><i>each</i></span><span style="font-size: 10pt">
+match:
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+loops;
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+merely tests, without changing the value of dot.
+Thus,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/Peter/ d</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">deletes all occurrences of
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">,
+but
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, g/Peter/ d</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">deletes the whole file (reduces it to a null string) if
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">
+occurs anywhere in the text.
+The complementary conditional is
+</span><span style="font-size: 10pt"><tt>v</tt></span><span style="font-size: 10pt">,
+which runs the command if there is
+</span><span style="font-size: 10pt"><i>no</i></span><span style="font-size: 10pt">
+match of the expression.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">These control-structure-like commands may be composed to construct more
+involved operations.  For example, to print those lines of text that
+contain the string
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/.*\n/ g/Peter/ p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+breaks the file into lines, the
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+selects those lines containing
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">,
+and the
+</span><span style="font-size: 10pt"><tt>p</tt></span><span style="font-size: 10pt">
+prints them.
+This command gives an address for the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command (the whole file), but because
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+does not have an explicit address, it applies to the value of
+dot produced by the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command, that is, to each line.
+All commands in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+except for the command to write a file to disc use dot for the
+default address.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Composition may be continued indefinitely.
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/.*\n/ g/Peter/ v/SaltPeter/ p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">prints those lines containing
+</span><span style="font-size: 10pt"><tt>Peter</tt></span><span style="font-size: 10pt">
+but
+</span><span style="font-size: 10pt"><i>not</i></span><span style="font-size: 10pt">
+those containing
+</span><span style="font-size: 10pt"><tt>SaltPeter</tt></span><span style="font-size: 10pt">.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Structural Regular Expressions
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Unlike other UNIX text editors,
+including the non-interactive ones such as
+</span><span style="font-size: 10pt"><tt>sed</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>awk</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is good for manipulating files with multi-line &lsquo;records.&rsquo;
+An example is an on-line phone book composed of records,
+separated by blank lines, of the form
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>Herbert Tic</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>44 Turnip Ave., Endive, NJ</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>201-5555642</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.15in"></p>
+
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>Norbert Twinge</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>16 Potato St., Cabbagetown, NJ</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>201-5553145</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.15in"></p>
+
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>...</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The format may be encoded as a regular expression:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>(.+\n)+</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">that is, a sequence of one or more non-blank lines.
+The command to print Mr. Tic&rsquo;s entire record is then
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/(.+\n)+/ g/^Herbert Tic$/ p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">and that to extract just the phone number is
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/(.+\n)+/ g/^Herbert Tic$/ x/^[0-9]*-[0-9]*\n/ p</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The latter command breaks the file into records,
+chooses Mr. Tic&rsquo;s record,
+extracts the phone number from the record,
+and finally prints the number.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A more involved problem is that of
+renaming a particular variable, say
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">,
+to
+</span><span style="font-size: 10pt"><tt>num</tt></span><span style="font-size: 10pt">
+in a C program.
+The obvious first attempt,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/n/ c/num/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">is badly flawed: it changes not only the variable
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">
+but any letter
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">
+that appears.
+We need to extract all the variables, and select those that match
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">
+and only
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The pattern
+</span><span style="font-size: 10pt"><tt>[A-Za-z_][A-Za-z_0-9]*</tt></span><span style="font-size: 10pt">
+matches C identifiers.
+Next
+</span><span style="font-size: 10pt"><tt>g/n/</tt></span><span style="font-size: 10pt">
+selects those containing an
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">.
+Then
+</span><span style="font-size: 10pt"><tt>v/../</tt></span><span style="font-size: 10pt">
+rejects those containing two (or more) characters, and finally
+</span><span style="font-size: 10pt"><tt>c/num/</tt></span><span style="font-size: 10pt">
+changes the remainder (identifiers
+</span><span style="font-size: 10pt"><tt>n</tt></span><span style="font-size: 10pt">)
+to
+</span><span style="font-size: 10pt"><tt>num</tt></span><span style="font-size: 10pt">.
+This version clearly works much better, but there may still be problems.
+For example, in C character and string constants, the sequence
+</span><span style="font-size: 10pt"><tt>\n</tt></span><span style="font-size: 10pt">
+is interpreted as a newline character, and we don&rsquo;t want to change it to
+</span><span style="font-size: 10pt"><tt>\num.</tt></span><span style="font-size: 10pt">
+This problem can be forestalled with a
+</span><span style="font-size: 10pt"><tt>y</tt></span><span style="font-size: 10pt">
+command:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>, y/\\n/ x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(the second
+</span><span style="font-size: 10pt"><tt>\</tt></span><span style="font-size: 10pt">
+is necessary because of lexical conventions in regular expressions),
+or we could even reject character constants and strings outright:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>,y/&rsquo;[^&rsquo;]*&rsquo;/ y/"[^"]*"/ x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>y</tt></span><span style="font-size: 10pt">
+commands in this version exclude from consideration all character constants
+and strings.
+The only remaining problem is to deal with the possible occurrence of
+</span><span style="font-size: 10pt"><tt>\&rsquo;</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>\"</tt></span><span style="font-size: 10pt">
+within these sequences, but it&rsquo;s easy to see how to resolve this difficulty.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The point of these composed commands is successive refinement.
+A simple version of the command is tried, and if it&rsquo;s not good enough,
+it can be honed by adding a clause or two.
+(Mistakes can be undone; see below.
+Also, the mouse language makes it unnecessary to retype the command each time.)
+The resulting chains of commands are somewhat reminiscent of
+shell pipelines.<sup></sup></span><sup><span style="font-size: 6pt">7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+Unlike pipelines, though, which pass along modified
+</span><span style="font-size: 10pt"><i>data</i></span><span style="font-size: 10pt">,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+commands pass a
+</span><span style="font-size: 10pt"><i>view</i></span><span style="font-size: 10pt">
+of the data.
+The text at each step of the command is the same, but which pieces
+are selected is refined step by step until the correct piece is
+available to the final step of the command line, which ultimately makes the change.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">In other UNIX programs, regular expressions are used only for selection,
+as in the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+command, never for extraction as in the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>y</tt></span><span style="font-size: 10pt">
+command.
+For example, patterns in
+</span><span style="font-size: 10pt"><tt>awk</tt></span><span style="font-size: 10pt"><sup></sup></span><sup><span style="font-size: 6pt">7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+are used to select lines to be operated on, but cannot be used
+to describe the format of the input text, or to handle newline-free text.
+The use of regular expressions to describe the structure of a piece
+of text rather than its contents, as in the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command, 
+has been given a name:
+</span><span style="font-size: 10pt"><i>structural regular expressions.
+</i></span><span style="font-size: 10pt">When they are composed, as in the above example,
+they are pleasantly expressive.
+Their use is discussed at greater length elsewhere.<sup></sup></span><sup><span style="font-size: 6pt">10</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Multiple files
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+has a few other commands, mostly relating to input and output.
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>e discfilename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces the contents and name of the current file with those of the named
+disc file;
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>w discfilename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">writes the contents to the named disc file; and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>r discfilename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">replaces dot with the contents of the named disc file.
+All these commands use the current file&rsquo;s name if none is specified.
+Finally,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>f discfilename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">changes the name associated with the file and displays the result:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>&rsquo;-. discfilename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">This output is called the file&rsquo;s
+</span><span style="font-size: 10pt"><i>menu line,
+</i></span><span style="font-size: 10pt">because it is the contents of the file&rsquo;s line in the button 3 menu (described
+in the
+next section).
+The first three characters are a concise notation for the state of the file.
+The apostrophe signifies that the file is modified.
+The minus sign indicates the number of windows
+open on the file (see the next section):
+</span><span style="font-size: 10pt"><tt>-</tt></span><span style="font-size: 10pt">
+means none,
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+means one, and
+</span><span style="font-size: 10pt"><tt>*</tt></span><span style="font-size: 10pt">
+means more than one.
+Finally, the period indicates that this is the current file.
+These characters are useful for controlling the
+</span><span style="font-size: 10pt"><tt>X</tt></span><span style="font-size: 10pt">
+command, described shortly.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+may be started with a set of disc files (such as all the source for
+a program) by invoking it with a list of file names as arguments, and
+more may be added or deleted on demand.
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>B discfile1 discfile2 ...</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">adds the named files to
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+list, and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>D discfile1 discfile2 ...</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">removes them from
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+memory (without effect on associated disc files).
+Both these commands have a syntax for using the shell<sup></sup></span><sup><span style="font-size: 6pt">7</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+(the UNIX command interpreter) to generate the lists:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>B &lt;echo *.c</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">will add all C source files, and
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>B &lt;grep -l variable *.c</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">will add all C source files referencing a particular variable
+(the UNIX command
+</span><span style="font-size: 10pt"><tt>grep\fP-l
+lists all files in its arguments that contain matches of
+the specified regular expression).
+Finally,
+</tt></span><span style="font-size: 10pt"><tt>D</tt></span><span style="font-size: 10pt"><tt>
+without arguments deletes the current file.
+</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">There are two ways to change which file is current:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>b filename</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">makes the named file current.
+The
+</span><span style="font-size: 10pt"><tt>B</tt></span><span style="font-size: 10pt">
+command
+does the same, but also adds any new files to
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+list.
+(In practice, of course, the current file
+is usually chosen by mouse actions, not by textual commands.)
+The other way is to use a form of address that refers to files:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>"</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>" </tt></span><span style="font-size: 9pt"><i>address</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">refers to the address evaluated in the file whose menu line
+matches the expression (there must be exactly one match).
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>"peter.c" 3</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">refers to the third line of the file whose name matches
+</span><span style="font-size: 10pt"><tt>peter.c</tt></span><span style="font-size: 10pt">.
+This is most useful in the move
+(</span><span style="font-size: 10pt"><tt>m</tt></span><span style="font-size: 10pt">)
+and copy
+(</span><span style="font-size: 10pt"><tt>t</tt></span><span style="font-size: 10pt">)
+commands:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>0,$ t "peter.c" 0</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">makes a copy of the current file at the beginning of
+</span><span style="font-size: 10pt"><tt>peter.c</tt></span><span style="font-size: 10pt">.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>X</tt></span><span style="font-size: 10pt">
+command
+is a looping construct, like
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">,
+that refers to files instead of strings:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>X/</tt></span><span style="font-size: 9pt"><i>expression</i></span><span style="font-size: 9pt"><tt>/ </tt></span><span style="font-size: 9pt"><i>command</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">runs the command in all
+files whose menu lines match the expression.  The best example is
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>X/&rsquo;/ w</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">which writes to disc all modified files.
+</span><span style="font-size: 10pt"><tt>Y</tt></span><span style="font-size: 10pt">
+is the complement of
+</span><span style="font-size: 10pt"><tt>X</tt></span><span style="font-size: 10pt">:
+it runs the command on all files whose menu lines don&rsquo;t match the expression:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>Y/\.c/ D</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">deletes all files that don&rsquo;t have
+</span><span style="font-size: 10pt"><tt>.c</tt></span><span style="font-size: 10pt">
+in their names, that is, it keeps all C source files and deletes the rest.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Braces allow commands to be grouped, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    </tt></span><span style="font-size: 9pt"><i>command1</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    </tt></span><span style="font-size: 9pt"><i>command2</i></span><span style="font-size: 9pt"><tt></tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">is syntactically a single command that runs two commands.
+Thus,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>X/\.c/ ,g/variable/ {</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    f</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    , x/.*\n/ g/variable/ p</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">finds all occurrences of
+</span><span style="font-size: 10pt"><tt>variable</tt></span><span style="font-size: 10pt">
+in C source files, and prints
+out the file names and lines of each match.
+The precise semantics of compound operations is discussed in the implementation
+sections below.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Finally,
+the undo command,
+</span><span style="font-size: 10pt"><tt>u</tt></span><span style="font-size: 10pt">,
+undoes the last command,
+no matter how many files were affected.
+Multiple undo operations move further back in time, so
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>u</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>u</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(which may be abbreviated
+</span><span style="font-size: 10pt"><tt>u2</tt></span><span style="font-size: 10pt">)
+undoes the last two commands.  An undo may not be undone, however, nor
+may any command that adds or deletes files.
+Everything else is undoable, though, including for example
+</span><span style="font-size: 10pt"><tt>e</tt></span><span style="font-size: 10pt">
+commands:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>e filename</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>u</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">restores the state of the file completely, including its name, dot,
+and modified bit.  Because of the undo, potentially dangerous commands
+are not guarded by confirmations.  Only
+</span><span style="font-size: 10pt"><tt>D</tt></span><span style="font-size: 10pt">,
+which destroys the information necessary to restore itself, is protected.
+It will not delete a modified file, but a second
+</span><span style="font-size: 10pt"><tt>D</tt></span><span style="font-size: 10pt">
+of the same file will succeed regardless.
+The
+</span><span style="font-size: 10pt"><tt>q</tt></span><span style="font-size: 10pt">
+command, which exits
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">,
+is similarly guarded.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Mouse Interface
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is most commonly run
+connected to a bitmap display and mouse for interactive editing.
+The only difference in the command language
+between regular, mouse-driven
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>sam\fP-d
+is that if an address
+is provided without a command,
+</tt></span><span style="font-size: 10pt"><tt>sam\fP-d
+will print the text referenced by the address, but
+regular
+</tt></span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt"><tt>
+will highlight it on the screen &mdash; in fact,
+dot is always highlighted (see Figure 2).
+</tt></span><span style="font-size: 10pt"></span></p><center><img src="fig3.gif" /></center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 2. A
+</i></span><span style="font-size: 8pt"><tt>sam</tt></span><span style="font-size: 8pt"><i>
+window.  The scroll bar down the left
+represents the file, with the bubble showing the fraction
+visible in the window.
+The scroll bar may be manipulated by the mouse for convenient browsing.
+The current text,
+which is highlighted, need not fit on a line.  Here it consists of one partial
+line, one complete line, and final partial line.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Each file may have zero or more windows open on the display.
+At any time, only one window in all of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is the
+</span><span style="font-size: 10pt"><i>current window,
+</i></span><span style="font-size: 10pt">that is, the window to which typing and mouse actions refer;
+this may be the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window (that in which commands may be typed)
+or one of the file windows.
+When a file has multiple windows, the image of the file in each window
+is always kept up to date.
+The current file is the last file affected by a command,
+so if the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window is current,
+the current window is not a window on the current file.
+However, each window on a file has its own value of dot,
+and when switching between windows on a single file,
+the file&rsquo;s value of dot is changed to that of the window.
+Thus, flipping between windows behaves in the obvious, convenient way.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The mouse on the Blit has three buttons, numbered left to right.
+Button 3 has a list of commands to manipulate windows,
+followed by a list of &lsquo;menu lines&rsquo; exactly as printed by the
+</span><span style="font-size: 10pt"><tt>f</tt></span><span style="font-size: 10pt">
+command, one per file (not one per window).
+These menu lines are sorted by file name.
+If the list is long, the Blit menu software will make it more manageable
+by generating a scrolling menu instead of an unwieldy long list.
+Using the menu to select a file from the list makes that file the current
+file, and the most recently current window in that file the current window.
+But if that file is already current, selecting it in the menu cycles through
+the windows on the file; this simple trick avoids a special menu to
+choose windows on a file.
+If there is no window open on the file,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+changes the mouse cursor to prompt the user to create one.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The commands on the button 3 menu are straightforward (see Figure 3), and
+are like the commands to manipulate windows in
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">8</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+the Blit&rsquo;s window system.
+</span><span style="font-size: 10pt"><tt>New</tt></span><span style="font-size: 10pt">
+makes a new file, and gives it one empty window, whose size is determined
+by a rectangle swept by the mouse.
+</span><span style="font-size: 10pt"><tt>Zerox</tt></span><span style="font-size: 10pt">
+prompts for a window to be selected, and
+makes a clone of that window; this is how multiple windows are created on one file.
+</span><span style="font-size: 10pt"><tt>Reshape</tt></span><span style="font-size: 10pt">
+changes the size of the indicated window, and
+</span><span style="font-size: 10pt"><tt>close</tt></span><span style="font-size: 10pt">
+deletes it.  If that is the last window open on the file,
+</span><span style="font-size: 10pt"><tt>close</tt></span><span style="font-size: 10pt">
+first does a
+</span><span style="font-size: 10pt"><tt>D</tt></span><span style="font-size: 10pt">
+command on the file.
+</span><span style="font-size: 10pt"><tt>Write</tt></span><span style="font-size: 10pt">
+is identical to a
+</span><span style="font-size: 10pt"><tt>w</tt></span><span style="font-size: 10pt">
+command on the file; it is in the menu purely for convenience.
+Finally,
+</span><span style="font-size: 10pt"><tt>~~sam~~</tt></span><span style="font-size: 10pt">
+is a menu item that appears between the commands and the file names.
+Selecting it makes the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window the current window,
+causing subsequent typing to be interpreted as commands.
+</span><span style="font-size: 10pt"></span></p><center><img src="fig2.gif" /></center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 3. The menu on button 3.
+The black rectangle on the left is a scroll bar; the menu is limited to
+the length shown to prevent its becoming unwieldy.
+Above the
+</i></span><span style="font-size: 8pt"><tt>~~sam~~</tt></span><span style="font-size: 8pt"><i>
+line is a list of commands;
+beneath it is a list of files, presented exactly as with the
+</i></span><span style="font-size: 8pt"><tt>f</tt></span><span style="font-size: 8pt"><i>
+command.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">When
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+requests that a window be swept, in response to
+</span><span style="font-size: 10pt"><tt>new</tt></span><span style="font-size: 10pt">,
+</span><span style="font-size: 10pt"><tt>zerox</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>reshape</tt></span><span style="font-size: 10pt">,
+it changes the mouse cursor from the usual arrow to a box with
+a small arrow.
+In this state, the mouse may be used to indicate an arbitrary rectangle by
+pressing button 3 at one corner and releasing it at the opposite corner.
+More conveniently,
+button 3 may simply be clicked,
+whereupon
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+creates the maximal rectangle that contains the cursor
+and abuts the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window.
+By placing the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window in the middle of the screen, the user can define two regions (one above,
+one below) in which stacked fully-overlapping
+windows can be created with minimal fuss (see Figure 1).
+This simple user interface trick makes window creation noticeably easier.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The cut-and-paste editor is essentially the same as that in Smalltalk-80.<sup></sup></span><sup><span style="font-size: 6pt">11</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+The text in dot is always highlighted on the screen.
+When a character is typed it replaces dot, and sets dot to the null
+string after the character.  Thus, ordinary typing inserts text.
+Button 1 is used for selection:
+pressing the button, moving the mouse, and lifting the button
+selects (sets dot to) the text between the points where the
+button was pressed and released.
+Pressing and releasing at the same point selects a null string; this
+is called clicking.  Clicking twice quickly, or
+</span><span style="font-size: 10pt"><i>double clicking,
+</i></span><span style="font-size: 10pt">selects larger objects;
+for example, double clicking in a word selects the word,
+double clicking just inside an opening bracket selects the text
+contained in the brackets (handling nested brackets correctly),
+and similarly for
+parentheses, quotes, and so on.
+The double-clicking rules reflect a bias toward
+programmers.
+If
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+were intended more for word processing, double-clicks would probably
+select linguistic structures such as sentences.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">If button 1 is pressed outside the current window, it makes the indicated
+window current.
+This is the easiest way to switch between windows and files.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Pressing button 2 brings up a menu of editing functions (see Figure 4).
+These mostly apply to the selected text:
+</span><span style="font-size: 10pt"><tt>cut</tt></span><span style="font-size: 10pt">
+deletes the selected text, and remembers it in a hidden buffer called the
+</span><span style="font-size: 10pt"><i>snarf buffer,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>paste</tt></span><span style="font-size: 10pt">
+replaces the selected text by the contents of the snarf buffer,
+</span><span style="font-size: 10pt"><tt>snarf</tt></span><span style="font-size: 10pt">
+just copies the selected text to the snarf buffer,
+</span><span style="font-size: 10pt"><tt>look</tt></span><span style="font-size: 10pt">
+searches forward for the next literal occurrence of the selected text, and
+</span><span style="font-size: 10pt"><tt>&lt;mux&gt;</tt></span><span style="font-size: 10pt">
+exchanges snarf buffers with the window system in which
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is running.
+Finally, the last regular expression used appears as a menu entry
+to search
+forward for the next occurrence of a match for the expression.
+</span><span style="font-size: 10pt"></span></p><center><img src="fig4.gif" /></center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 4. The menu on button 2.
+The bottom entry tracks the most recently used regular expression, which may
+be literal text.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The relationship between the command language and the mouse language is
+entirely due to the equality of dot and the selected text chosen
+with button 1 on the mouse.
+For example, to make a set of changes in a C subroutine, dot can be
+set by double clicking on the left brace that begins the subroutine,
+which sets dot for the command language.
+An address-free command then typed in the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window will apply only to the text between the opening and closing
+braces of the function.
+The idea is to select what you want, and then say what you want
+to do with it, whether invoked by a menu selection or by a typed command.
+And of course, the value of dot is highlighted on
+the display after the command completes.
+This relationship between mouse interface and command language
+is clumsy to explain, but comfortable, even natural, in practice.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>The Implementation
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The next few sections describe how
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is put together, first the host part,
+then the inter-component communication,
+then the terminal part.
+After explaining how the command language is implemented,
+the discussion follows (roughly) the path of a character
+from the temporary file on disc to the screen.
+The presentation centers on the data structures,
+because that is how the program was designed and because
+the algorithms are easy to provide, given the right data
+structures.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Parsing and execution
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The command language is interpreted by parsing each command with a
+table-driven recursive
+descent parser, and when a complete command is assembled, invoking a top-down
+executor.
+Most editors instead employ a simple character-at-a-time
+lexical scanner.
+Use of a parser makes it
+easy and unambiguous to detect when a command is complete,
+which has two advantages.
+First, escape conventions such as backslashes to quote
+multiple-line commands are unnecessary;  if the command isn&rsquo;t finished,
+the parser keeps reading.  For example, a multiple-line append driven by an
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command is straightforward:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>x/.*\n/ g/Peter/ a</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>one line about Peter</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>another line about Peter</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>.</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Other UNIX editors would require a backslash after all but the last line.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The other advantage is specific to the two-process structure of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">.
+The host process must decide when a command is completed so the
+command interpreter can be called.  This problem is easily resolved
+by having the lexical analyzer read the single stream of events from the
+terminal, directly executing all typing and mouse commands,
+but passing to the parser characters typed to the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+command window.
+This scheme is slightly complicated by the availability of cut-and-paste
+editing in the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window, but that difficulty is resolved by applying the rules
+used in
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">:
+when a newline is typed to the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window, all text between the newline and the previously typed newline
+is made available to the parser.
+This permits arbitrary editing to be done to a command before
+typing newline and thereby requesting execution.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The parser is driven by a table because the syntax of addresses
+and commands is regular enough
+to be encoded compactly.  There are few special cases, such as the
+replacement text in a substitution, so the syntax of almost all commands
+can be encoded with a few flags.
+These include whether the command allows an address (for example,
+</span><span style="font-size: 10pt"><tt>e</tt></span><span style="font-size: 10pt">
+does not), whether it takes a regular expression (as in
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>s</tt></span><span style="font-size: 10pt">),
+whether it takes replacement text (as in
+</span><span style="font-size: 10pt"><tt>c</tt></span><span style="font-size: 10pt">
+or
+</span><span style="font-size: 10pt"><tt>i</tt></span><span style="font-size: 10pt">),
+which may be multi-line, and so on.
+The internal syntax of regular expressions is handled by a separate
+parser; a regular expression is a leaf of the command parse tree.
+Regular expressions are discussed fully in the next section.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The parser table also has information about defaults, so the interpreter
+is always called with a complete tree.  For example, the parser fills in
+the implicit
+</span><span style="font-size: 10pt"><tt>0</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>$</tt></span><span style="font-size: 10pt">
+in the abbreviated address
+</span><span style="font-size: 10pt"><tt>,</tt></span><span style="font-size: 10pt">
+(comma),
+inserts a
+</span><span style="font-size: 10pt"><tt>+</tt></span><span style="font-size: 10pt">
+to the left of an unadorned regular expression in an address,
+and provides the usual default address
+</span><span style="font-size: 10pt"><tt>.</tt></span><span style="font-size: 10pt">
+(dot) for commands that expect an address but are not given one.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Once a complete command is parsed, the evaluation is easy.
+The address is evaluated left-to-right starting from the value of dot,
+with a mostly ordinary expression evaluator.
+Addresses, like many of the data structures in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">,
+are held in a C structure and passed around by value:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>typedef long Posn;    /* Position in a file */</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>typedef struct Range{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        Posn    p1, p2;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}Range;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>typedef struct Address{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        Range   r;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        File    *f;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}Address;</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">An address is encoded as a substring (character positions
+</span><span style="font-size: 10pt"><tt>p1</tt></span><span style="font-size: 10pt">
+to
+</span><span style="font-size: 10pt"><tt>p2</tt></span><span style="font-size: 10pt">)
+in a file
+</span><span style="font-size: 10pt"><tt>f</tt></span><span style="font-size: 10pt">.
+(The data type
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+is described in detail below.)
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The address interpreter is an
+</span><span style="font-size: 10pt"><tt>Address</tt></span><span style="font-size: 10pt">-valued
+function that traverses the parse tree describing an address (the
+parse tree for the address has type
+</span><span style="font-size: 10pt"><tt>Addrtree</tt></span><span style="font-size: 10pt">):
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>Address</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>address(ap, a, sign)</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    Addrtree *ap;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    Address a;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    int sign;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    Address a2;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    do</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        switch(ap-&gt;type){</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        case &rsquo;.&rsquo;:</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a=a.f-&gt;dot;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            break;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        case &rsquo;$&rsquo;:</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a.r.p1=a.r.p2=a.f-&gt;nbytes;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            break;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        case &rsquo;"&rsquo;:   </tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a=matchfile(a, ap-&gt;aregexp)-&gt;dot; </tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            break;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        case &rsquo;,&rsquo;:</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a2=address(ap-&gt;right, a, 0);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a=address(ap-&gt;left, a, 0);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            if(a.f!=a2.f || a2.r.p2&lt;a.r.p1)</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>                error(Eorder);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            a.r.p2=a2.r.p2;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>            return a;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        /* and so on */</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        }</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    while((ap=ap-&gt;right)!=0);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    return a;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Throughout, errors are handled by a non-local
+</span><span style="font-size: 10pt"><tt>goto</tt></span><span style="font-size: 10pt">
+(a
+</span><span style="font-size: 10pt"><tt>setjmp/longjmp</tt></span><span style="font-size: 10pt">
+in C terminology)
+hidden in a routine called
+</span><span style="font-size: 10pt"><tt>error</tt></span><span style="font-size: 10pt">
+that immediately aborts the execution, retracts any
+partially made changes (see the section below on &lsquo;undoing&rsquo;), and
+returns to the top level of the parser.
+The argument to
+</span><span style="font-size: 10pt"><tt>error</tt></span><span style="font-size: 10pt">
+is an enumeration type that
+is translated to a terse but possibly helpful
+message such as &lsquo;?addresses out of order.&rsquo;
+Very common messages are kept short; for example the message for
+a failed regular expression search is &lsquo;?search.&rsquo;
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Character addresses such as
+</span><span style="font-size: 10pt"><tt>#3</tt></span><span style="font-size: 10pt">
+are trivial to implement, as the
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+data structure is accessible by character number.
+However,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+keeps no information about the position of newlines &mdash; it is too
+expensive to track dynamically &mdash; so line addresses are computed by reading
+the file, counting newlines.  Except in very large files, this has proven
+acceptable: file access is fast enough to make the technique practical,
+and lines are not central to the structure of the command language.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The command interpreter, called
+</span><span style="font-size: 10pt"><tt>cmdexec</tt></span><span style="font-size: 10pt">,
+is also straightforward.  The parse table includes a
+function to call to interpret a particular command.  That function
+receives as arguments
+the calculated address
+for the command
+and the command tree (of type
+</span><span style="font-size: 10pt"><tt>Cmdtree</tt></span><span style="font-size: 10pt">),
+which may contain information such as the subtree for compound commands.
+Here, for example, is the function for the
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>v</tt></span><span style="font-size: 10pt">
+commands:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>int</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>g_cmd(a, cp)</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    Address a;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    Cmdtree *cp;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    compile(cp-&gt;regexp);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    if(execute(a.f, a.r.p1, a.r.p2)!=(cp-&gt;cmdchar==&rsquo;v&rsquo;)){</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        a.f-&gt;dot=a;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        return cmdexec(a, cp-&gt;subcmd);</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    }</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>    return TRUE;    /* cause execution to continue */</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">(</span><span style="font-size: 10pt"><tt>Compile</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>execute</tt></span><span style="font-size: 10pt">
+are part of the regular expression code, described in the next section.)
+Because the parser and the
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+data structure do most of the work, most commands
+are similarly brief.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Regular expressions
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The regular expression code in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is an interpreted, rather than compiled on-the-fly, implementation of Thompson&rsquo;s
+non-deterministic finite automaton algorithm.<sup></sup></span><sup><span style="font-size: 6pt">12</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+The syntax and semantics of the expressions are as in the UNIX program
+</span><span style="font-size: 10pt"><tt>egrep</tt></span><span style="font-size: 10pt">,
+including alternation, closures, character classes, and so on.
+The only changes in the notation are two additions:
+</span><span style="font-size: 10pt"><tt>\n</tt></span><span style="font-size: 10pt">
+is translated to, and matches, a newline character, and
+</span><span style="font-size: 10pt"><tt>@</tt></span><span style="font-size: 10pt">
+matches any character.  In
+</span><span style="font-size: 10pt"><tt>egrep</tt></span><span style="font-size: 10pt">,
+the character
+</span><span style="font-size: 10pt"><tt>.</tt></span><span style="font-size: 10pt">
+matches any character except newline, and in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+the same rule seemed safest, to prevent idioms like
+</span><span style="font-size: 10pt"><tt>.*</tt></span><span style="font-size: 10pt">
+from spanning newlines.
+</span><span style="font-size: 10pt"><tt>Egrep</tt></span><span style="font-size: 10pt">
+expressions are arguably too complicated for an interactive editor &mdash;
+certainly it would make sense if all the special characters were two-character
+sequences, so that most of the punctuation characters wouldn&rsquo;t have
+peculiar meanings &mdash; but for an interesting command language, full
+regular expressions are necessary, and
+</span><span style="font-size: 10pt"><tt>egrep</tt></span><span style="font-size: 10pt">
+defines the full regular expression syntax for UNIX programs.
+Also, it seemed superfluous to define a new syntax, since various UNIX programs
+(</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">,
+</span><span style="font-size: 10pt"><tt>egrep</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>vi</tt></span><span style="font-size: 10pt">)
+define too many already.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The expressions are compiled by a routine,
+</span><span style="font-size: 10pt"><tt>compile</tt></span><span style="font-size: 10pt">,
+that generates the description of the non-deterministic finite state machine.
+A second routine,
+</span><span style="font-size: 10pt"><tt>execute</tt></span><span style="font-size: 10pt">,
+interprets the machine to generate the leftmost-longest match of the
+expression in a substring of the file.
+The algorithm is described elsewhere.<sup></sup></span><sup><span style="font-size: 6pt">12,13</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>Execute</tt></span><span style="font-size: 10pt">
+reports
+whether a match was found, and sets a global variable,
+of type
+</span><span style="font-size: 10pt"><tt>Range</tt></span><span style="font-size: 10pt">,
+to the substring matched.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A trick is required to evaluate the expression in reverse, such as when
+searching backwards for an expression.
+For example,
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>-/P.*r/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">looks backwards through the file for a match of the expression.
+The expression, however, is defined for a forward search.
+The solution is to construct a machine identical to the machine
+for a forward search except for a reversal of all the concatenation
+operators (the other operators are symmetric under direction reversal),
+to exchange the meaning of the operators
+</span><span style="font-size: 10pt"><tt>^</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>$</tt></span><span style="font-size: 10pt">,
+and then to read the file backwards, looking for the
+usual earliest longest match.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Execute</tt></span><span style="font-size: 10pt">
+generates only one match each time it is called.
+To interpret looping constructs such as the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+must therefore synchronize between
+calls of
+</span><span style="font-size: 10pt"><tt>execute</tt></span><span style="font-size: 10pt">
+to avoid
+problems with null matches.
+For example, even given the leftmost-longest rule,
+the expression
+</span><span style="font-size: 10pt"><tt>a*</tt></span><span style="font-size: 10pt">
+matches three times in the string
+</span><span style="font-size: 10pt"><tt>ab</tt></span><span style="font-size: 10pt">
+(the character
+</span><span style="font-size: 10pt"><tt>a</tt></span><span style="font-size: 10pt">,
+the null string between the
+</span><span style="font-size: 10pt"><tt>a</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>b</tt></span><span style="font-size: 10pt">,
+and the final null string).
+After returning a match for the
+</span><span style="font-size: 10pt"><tt>a</tt></span><span style="font-size: 10pt">,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+must not match the null string before the
+</span><span style="font-size: 10pt"><tt>b</tt></span><span style="font-size: 10pt">.
+The algorithm starts
+</span><span style="font-size: 10pt"><tt>execute</tt></span><span style="font-size: 10pt">
+at the end of its previous match, and
+if the match it returns
+is null and abuts the previous match, rejects the match and advances
+the initial position one character.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Memory allocation
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The C language has no memory allocation primitives, although a standard
+library routine,
+</span><span style="font-size: 10pt"><tt>malloc</tt></span><span style="font-size: 10pt">,
+provides adequate service for simple programs.
+For specific uses, however,
+it can be better to write a custom allocator.
+The allocator (or rather, pair of allocators) described here
+work in both the terminal and host parts of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">.
+They are designed for efficient manipulation of strings,
+which are allocated and freed frequently and vary in length from essentially
+zero to 32 Kbytes (very large strings are written to disc).
+More important, strings may be large and change size often,
+so to minimize memory usage it is helpful to reclaim and to coalesce the
+unused portions of strings when they are truncated.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Objects to be allocated in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+are of two flavors:
+the first is C
+</span><span style="font-size: 10pt"><tt>structs</tt></span><span style="font-size: 10pt">,
+which are small and often addressed by pointer variables;
+the second is variable-sized arrays of characters
+or integers whose
+base pointer is always used to access them.
+The memory allocator in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is therefore in two parts:
+first, a traditional first-fit allocator that provides fixed storage for
+</span><span style="font-size: 10pt"><tt>structs</tt></span><span style="font-size: 10pt">;
+and second, a garbage-compacting allocator that reduces storage
+overhead for variable-sized objects, at the cost of some bookkeeping.
+The two types of objects are allocated from adjoining arenas, with
+the garbage-compacting allocator controlling the arena with higher addresses.
+Separating into two arenas simplifies compaction and prevents fragmentation due
+to immovable objects.
+The access rules for garbage-compactable objects
+(discussed in the next paragraph) allow them to be relocated, so when
+the first-fit arena needs space, it moves the garbage-compacted arena
+to higher addresses to make room.  Storage is therefore created only
+at successively higher addresses, either when more garbage-compacted
+space is needed or when the first-fit arena pushes up the other arena.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Objects that may be compacted declare to the
+allocator a cell that is guaranteed to be the sole repository of the
+address of the object whenever a compaction can occur.
+The compactor can then update the address when the object is moved.
+For example, the implementation of type
+</span><span style="font-size: 10pt"><tt>List</tt></span><span style="font-size: 10pt">
+(really a variable-length array)
+is:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>typedef struct List{</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        int     nused;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>        long    *ptr;</tt></span></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>}List;</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>ptr</tt></span><span style="font-size: 10pt">
+cell must always be used directly, and never copied.  When a
+</span><span style="font-size: 10pt"><tt>List</tt></span><span style="font-size: 10pt">
+is to be created the
+</span><span style="font-size: 10pt"><tt>List</tt></span><span style="font-size: 10pt">
+structure is allocated in the ordinary first-fit arena
+and its
+</span><span style="font-size: 10pt"><tt>ptr</tt></span><span style="font-size: 10pt">
+is allocated in the garbage-compacted arena.
+A similar data type for strings, called
+</span><span style="font-size: 10pt"><tt>String</tt></span><span style="font-size: 10pt">,
+stores variable-length character arrays of up to 32767 elements.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A related matter of programming style:
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+frequently passes structures by value, which
+simplifies the code.
+Traditionally, C programs have
+passed structures by reference, but implicit allocation on
+the stack is easier to use.
+Structure passing is a relatively new feature of C
+(it is not in the 
+standard reference manual for C<sup></sup></span><sup><span style="font-size: 6pt">14</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">), and is poorly supported in most
+commercial C compilers.
+It&rsquo;s convenient and expressive, though,
+and simplifies memory management by
+avoiding the allocator altogether
+and eliminating pointer aliases.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Data structures for manipulating files
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Experience with
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+showed that the requirements
+of the file data structure were few, but strict.
+First, files need to be read and written quickly;
+adding a fresh file must be painless.
+Second, the implementation must place no arbitrary upper limit on
+the number or sizes of files.  (It should be practical to edit many files,
+and files up to megabytes in length should be handled gracefully.)
+This implies that files be stored on disc, not in main memory.
+(Aficionados of virtual memory may argue otherwise, but the
+implementation of virtual
+memory in our system is not something to depend on
+for good performance.)
+Third, changes to files need be made by only two primitives:
+deletion and insertion.
+These are inverses of each other,
+which simplifies the implementation of the undo operation.
+Finally,
+it must be easy and efficient to access the file, either
+forwards or backwards, a byte at a time.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+data type is constructed from three simpler data structures that hold arrays
+of characters.
+Each of these types has an insertion and deletion operator, and the
+insertion and deletion operators of the
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+type itself are constructed from them.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The simplest type is the
+</span><span style="font-size: 10pt"><tt>String</tt></span><span style="font-size: 10pt">,
+which is used to hold strings in main memory.
+The code that manages
+</span><span style="font-size: 10pt"><tt>Strings</tt></span><span style="font-size: 10pt">
+guarantees that they will never be longer
+than some moderate size, and in practice they are rarely larger than 8 Kbytes.
+</span><span style="font-size: 10pt"><tt>Strings</tt></span><span style="font-size: 10pt">
+have two purposes: they hold short strings like file names with little overhead,
+and because they are deliberately small, they are efficient to modify.
+They are therefore used as the data structure for in-memory caches.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The disc copy of the file is managed by a data structure called a
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">,
+which corresponds to a temporary file.  A
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+has no storage in main memory other than bookkeeping information;
+the actual data being held is all on the disc.
+To reduce the number of open files needed,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+opens a dozen temporary UNIX files and multiplexes the
+</span><span style="font-size: 10pt"><tt>Discs</tt></span><span style="font-size: 10pt">
+upon them.
+This permits many files to
+be edited; the entire
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+source (48 files) may be edited comfortably with a single
+instance of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">.
+Allocating one temporary file per
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+would strain the operating system&rsquo;s limit on the number of open files.
+Also, spreading the traffic among temporary files keeps the files shorter,
+and shorter files are more efficiently implemented by the UNIX
+I/O subsystem.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+is an array of fixed-length blocks, each of which contains
+between 1 and 4096 characters of active data.
+(The block size of our UNIX file system is 4096 bytes.)
+The block addresses within the temporary file and the length of each
+block are stored in a
+</span><span style="font-size: 10pt"><tt>List</tt></span><span style="font-size: 10pt">.
+When changes are made the live part of blocks may change size.
+Blocks are created and coalesced when necessary to try to keep the sizes
+between 2048 and 4096 bytes.
+An actively changing part of the
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+therefore typically has about a kilobyte of slop that can be
+inserted or deleted
+without changing more than one block or affecting the block order.
+When an insertion would overflow a block, the block is split, a new one
+is allocated to receive the overflow, and the memory-resident list of blocks
+is rearranged to reflect the insertion of the new block.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Obviously, going to the disc for every modification to the file is
+prohibitively expensive.
+The data type
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">
+consists of a
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+to hold the data and a
+</span><span style="font-size: 10pt"><tt>String</tt></span><span style="font-size: 10pt">
+that acts as a cache.
+This is the first of a series of caches throughout the data structures in
+</span><span style="font-size: 10pt"><tt>sam.</tt></span><span style="font-size: 10pt">
+The caches not only improve performance, they provide a way to organize
+the flow of data, particularly in the communication between the host
+and terminal.
+This idea is developed below, in the section on communications.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">To reduce disc traffic, changes to a
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">
+are mediated by a variable-length string, in memory, that acts as a cache.
+When an insertion or deletion is made to a
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">,
+if the change can be accommodated by the cache, it is done there.
+If the cache becomes bigger than a block because of an insertion,
+some of it is written to the
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+and deleted from the cache.
+If the change does not intersect the cache, the cache is flushed.
+The cache is only loaded at the new position if the change is smaller than a block;
+otherwise, it is sent directly to the
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">.
+This is because
+large changes are typically sequential,
+whereupon the next change is unlikely to overlap the current one.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">A
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+comprises a
+</span><span style="font-size: 10pt"><tt>String</tt></span><span style="font-size: 10pt">
+to hold the file name and some ancillary data such as dot and the modified bit.
+The most important components, though, are a pair of
+</span><span style="font-size: 10pt"><tt>Buffers</tt></span><span style="font-size: 10pt">,
+one called the transcript and the other the contents.
+Their use is described in the next section.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The overall structure is shown in Figure 5.
+Although it may seem that the data is touched many times on its
+way from the
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">,
+it is read (by one UNIX system call) directly into the cache of the
+associated
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">;
+no extra copy is done.
+Similarly, when flushing the cache, the text is written
+directly from the cache to disc.
+Most operations act directly on the text in the cache.
+A principle applied throughout
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is that the fewer times the data is copied, the faster the program will run
+(see also the paper by Waite<sup></sup></span><sup><span style="font-size: 6pt">15</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">).
+</span><span style="font-size: 10pt"></span></p><center><img src="sam2.png"></center>
+</center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 5. File data structures.
+The temporary files are stored in the standard repository for such files
+on the host system.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The contents of a
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+are accessed by a routine that
+copies to a buffer a substring of a file starting at a specified offset.
+To read a byte at a time, a
+per-</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+array is loaded starting from a specified initial position,
+and bytes may then be read from the array.
+The implementation is done by a macro similar to the C standard I/O
+</span><span style="font-size: 10pt"><tt>getc</tt></span><span style="font-size: 10pt">
+macro.<sup></sup></span><sup><span style="font-size: 6pt">14</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+Because the reading may be done at any address, a minor change to the
+macro allows the file to be read backwards.
+This array is read-only; there is no
+</span><span style="font-size: 10pt"><tt>putc</tt></span><span style="font-size: 10pt">.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Doing and undoing
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+has an unusual method for managing changes to files.
+The command language makes it easy to specify multiple variable-length changes
+to a file millions of bytes long, and such changes
+must be made efficiently if the editor is to be practical.
+The usual techniques for inserting and deleting strings
+are inadequate under these conditions.
+The
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+data structures are designed for efficient random access to long strings,
+but care must be taken to avoid super-linear behavior when making
+many changes simultaneously.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+uses a two-pass algorithm for making changes, and treats each file as a database
+against which transactions are registered.
+Changes are not made directly to the contents.
+Instead, when a command is started, a &lsquo;mark&rsquo; containing
+a sequence number is placed in the transcript
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">,
+and each change made to the file, either an insertion or deletion
+or a change to the file name,
+is appended to the end of the transcript.
+When the command is complete, the transcript is rewound to the
+mark and applied to the contents.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">One reason for separating evaluation from
+application in this way is to simplify tracking the addresses of changes
+made in the middle of a long sequence.
+The two-pass algorithm also allows all changes to apply to the
+</span><span style="font-size: 10pt"><i>original</i></span><span style="font-size: 10pt">
+data: no change can affect another change made in the same command.
+This is particularly important when evaluating an
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command because it prevents regular expression matches
+from stumbling over changes made earlier in the execution.
+Also, the two-pass
+algorithm is cleaner than the way other UNIX editors allow changes to
+affect each other;
+for example,
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s
+idioms to do things like delete every other line
+depend critically on the implementation.
+Instead,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+simple model, in which all changes in a command occur effectively
+simultaneously, is easy to explain and to understand.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The records in the transcript are of the form &lsquo;&lsquo;delete substring from
+locations
+123 to 456&rsquo;&rsquo; and &lsquo;&lsquo;insert 11 characters &lsquo;hello there&rsquo; at location 789.&rsquo;&rsquo;
+(It is an error if the changes are not at monotonically greater
+positions through the file.)
+While the update is occurring, these numbers must be
+offset by earlier changes, but that is straightforward and
+local to the update routine;
+moreover, all the numbers have been computed
+before the first is examined.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Treating the file as a transaction system has another advantage:
+undo is trivial.
+All it takes is to invert the transcript after it has been
+implemented, converting insertions
+into deletions and vice versa, and saving them in a holding
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">.
+The &lsquo;do&rsquo; transcript can then be deleted from
+the transcript
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">
+and replaced by the &lsquo;undo&rsquo; transcript.
+If an undo is requested, the transcript is rewound and the undo transcript
+executed.
+Because the transcript
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">
+is not truncated after each command, it accumulates
+successive changes.
+A sequence of undo commands
+can therefore back up the file arbitrarily,
+which is more helpful than the more commonly implemented self-inverse form of undo.
+(</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+provides no way to undo an undo, but if it were desired,
+it would be easy to provide by re-interpreting the &lsquo;do&rsquo; transcript.)
+Each mark in the transcript contains a sequence number and the offset into
+the transcript of the previous mark, to aid in unwinding the transcript.
+Marks also contain the value of dot and the modified bit so these can be
+restored easily.
+Undoing multiple files is easy; it merely demands undoing all files whose
+latest change has the same sequence number as the current file.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Another benefit of having a transcript is that errors encountered in the middle
+of a complicated command need not leave the files in an intermediate state.
+By rewinding the transcript to the mark beginning the command,
+the partial command can be trivially undone.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">When the update algorithm was first implemented, it was unacceptably slow,
+so a cache was added to coalesce nearby changes,
+replacing multiple small changes by a single larger one.
+This reduced the number
+of insertions into the transaction
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">,
+and made a dramatic improvement in performance,
+but made it impossible
+to handle changes in non-monotonic order in the file; the caching method
+only works if changes don&rsquo;t overlap.
+Before the cache was added, the transaction could in principle be sorted
+if the changes were out of order, although
+this was never done.
+The current status is therefore acceptable performance with a minor
+restriction on global changes, which is sometimes, but rarely, an annoyance.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The update algorithm obviously paws the data more than simpler
+algorithms, but it is not prohibitively expensive;
+the caches help.
+(The principle of avoiding copying the data is still honored here,
+although not as piously:
+the data is moved from contents&rsquo; cache to
+the transcript&rsquo;s all at once and through only one internal buffer.)
+Performance figures confirm the efficiency.
+To read from a dead start a hundred kilobyte file on a VAX-11/750
+takes 1.4 seconds of user time, 2.5 seconds of system time,
+and 5 seconds of real time.
+Reading the same file in
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+takes 6.0 seconds of user time, 1.7 seconds of system time,
+and 8 seconds of real time.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+uses about half the CPU time.
+A more interesting example is the one stated above:
+inserting a character between every pair of characters in the file.
+The
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+command is
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>,y/@/ a/x/</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">and takes 3 CPU seconds per kilobyte of input file, of which
+about a third is spent in the regular expression code.
+This translates to about 500 changes per second.
+</span><span style="font-size: 10pt"><tt>Ed</tt></span><span style="font-size: 10pt">
+takes 1.5 seconds per kilobyte to make a similar change (ignoring newlines),
+but cannot undo it.
+The same example in
+</span><span style="font-size: 10pt"><tt>ex</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">9</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+a variant of
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+done at the University of California at Berkeley,
+which allows one level of undoing, again takes 3 seconds.
+In summary,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+performance is comparable to that of other UNIX editors, although it solves
+a harder problem.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Communications
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The discussion so far has described the implementation of the host part of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">;
+the next few sections explain how a machine with mouse and bitmap display
+can be engaged to improve interaction.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is not the first editor to be written as two processes,<sup></sup></span><sup><span style="font-size: 6pt">16</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+but its implementation
+has some unusual aspects.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">There are several ways
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+host and terminal parts may be connected.
+The first and simplest is to forgo the terminal part and use the host
+part&rsquo;s command language to edit text on an ordinary terminal.
+This mode is invoked by starting
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+with the
+</span><span style="font-size: 10pt"><tt>-d</tt></span><span style="font-size: 10pt">
+option.
+With no options,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+runs separate host and terminal programs,
+communicating with a message protocol over the physical
+connection that joins them.
+Typically, the connection is an RS-232 link between a Blit
+(the prototypical display for
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">)
+and a host running
+the Ninth Edition of the UNIX operating system.<sup></sup></span><sup><span style="font-size: 6pt">8</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+(This is the version of the system used in the Computing Sciences Research
+Center at AT&amp;T Bell Laboratories [now Lucent Technologies, Bell Labs], where I work.  Its relevant
+aspects are discussed in the Blit paper.<sup></sup></span><sup><span style="font-size: 6pt">1</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">)
+The implementation of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+for the SUN computer runs both processes on the same machine and
+connects them by a pipe.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The low bandwidth of an RS-232 link
+necessitated the split between
+the two programs.
+The division is a mixed blessing:
+a program in two parts is much harder to write and to debug
+than a self-contained one,
+but the split makes several unusual configurations possible.
+The terminal may be physically separated from the host, allowing the conveniences
+of a mouse and bitmap display to be taken home while leaving the files at work.
+It is also possible to run the host part on a remote machine:
+</span></p><p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.1em; margin-left: 1.28in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 9pt"><tt>sam -r host</tt></span></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">connects to the terminal in the usual way, and then makes a call
+across the network to establish the host part of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+on the named machine.
+Finally, it cross-connects the I/O to join the two parts.
+This allows
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+to be run on machines that do not support bitmap displays;
+for example,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is the editor of choice on our Cray X-MP/24.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>-r</tt></span><span style="font-size: 10pt">
+involves
+</span><span style="font-size: 10pt"><i>three</i></span><span style="font-size: 10pt">
+machines: the remote host, the terminal, and the local host.
+The local host&rsquo;s job is simple but vital: it passes the data
+between the remote host and terminal.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The host and terminal exchange messages asynchronously
+(rather than, say, as remote procedure calls) but there is no
+error detection or correction
+because, whatever the configuration, the connection is reliable.
+Because the terminal handles mundane interaction tasks such as
+popping up menus and interpreting the responses, the messages are about
+data, not actions.
+For example, the host knows nothing about what is displayed on the screen,
+and when the user types a character, the message sent to the host says
+&lsquo;&lsquo;insert a one-byte string at location 123 in file 7,&rsquo;&rsquo; not &lsquo;&lsquo;a character
+was typed at the current position in the current file.&rsquo;&rsquo;
+In other words, the messages look very much like the transaction records
+in the transcripts.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Either the host or terminal part of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+may initiate a change to a file.
+The command language operates on the host, while typing and some
+mouse operations are executed directly in the terminal to optimize response.
+Changes initiated by the host program must be transmitted to the terminal,
+and
+vice versa.
+(A token is exchanged to determine which end is in control,
+which means that characters typed while a time-consuming command runs
+must be buffered and do not appear until the command is complete.)
+To maintain consistent information,
+the host and terminal track changes through a per-file
+data structure that records what portions of the file
+the terminal has received.
+The data structure, called a
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+(a weak pun: it&rsquo;s a file with holes)
+is held and updated by both the host and terminal.
+A
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+is a list of
+</span><span style="font-size: 10pt"><tt>Strings</tt></span><span style="font-size: 10pt">
+holding those parts of the file known to the terminal,
+separated by counts of the number of bytes in the interstices.
+Of course, the host doesn&rsquo;t keep a separate copy of the data (it only needs
+the lengths of the various pieces),
+but the structure is the same on both ends.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+in the terminal doubles as a cache.
+Since the terminal keeps the text for portions of the file it has displayed,
+it need not request data from the host when revisiting old parts of the file
+or redrawing obscured windows, which speeds things up considerably
+over low-speed links.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">It&rsquo;s trivial for the terminal to maintain its
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">,
+because all changes made on the terminal apply to parts of the file
+already loaded there.
+Changes made by the host are compared against the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+during the update sequence after each command.
+Small changes to pieces of the file loaded in the terminal
+are sent in their entirety.
+Larger changes, and changes that fall entirely in the holes,
+are transmitted as messages without literal data:
+only the lengths of the deleted and inserted strings are transmitted.
+When a command is completed, the terminal examines its visible
+windows to see if any holes in their
+</span><span style="font-size: 10pt"><tt>Rasps</tt></span><span style="font-size: 10pt">
+intersect the visible portion of the file.
+It then requests the missing data from the host,
+along with up to 512 bytes of surrounding data, to minimize
+the number of messages when visiting a new portion of the file.
+This technique provides a kind of two-level lazy evaluation for the terminal.
+The first level sends a minimum of information about
+parts of the file not being edited interactively;
+the second level waits until a change is displayed before
+transmitting the new data.
+Of course,
+performance is also helped by having the terminal respond immediately to typing
+and simple mouse requests.
+Except for small changes to active pieces of the file, which are
+transmitted to the terminal without negotiation,
+the terminal is wholly responsible for deciding what is displayed;
+the host uses the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+only to tell the terminal what might be relevant.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">When a change is initiated by the host,
+the messages to the terminal describing the change
+are generated by the routine that applies the transcript of the changes
+to the contents of the
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">.
+Since changes are undone by the same update routine,
+undoing requires
+no extra code in the communications;
+the usual messages describing changes to the file are sufficient
+to back up the screen image.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+is a particularly good example of the way caches are used in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">.
+First, it facilitates access to the active portion of the text by placing
+the busy text in main memory.
+In so doing, it provides efficient access
+to a large data structure that does not fit in memory.
+Since the form of data is to be imposed by the user, not by the program,
+and because characters will frequently be scanned sequentially,
+files are stored as flat objects.
+Caches help keep performance good and linear when working with such
+data.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Second, the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+and several of the other caches have some
+</span><span style="font-size: 10pt"><i>read-ahead;</i></span><span style="font-size: 10pt">
+that is, the cache is loaded with more information than is needed for
+the job immediately at hand.
+When manipulating linear structures, the accesses are usually sequential,
+and read-ahead can significantly reduce the average time to access the
+next element of the object.
+Sequential access is a common mode for people as well as programs;
+consider scrolling through a document while looking for something.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Finally, like any good data structure,
+the cache guides the algorithm, or at least the implementation.
+The
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+was actually invented to control the communications between the host and
+terminal parts, but I realized very early that it was also a form of
+cache.  Other caches were more explicitly intended to serve a double
+purpose: for example, the caches in
+</span><span style="font-size: 10pt"><tt>Files</tt></span><span style="font-size: 10pt">
+that coalesce updates not only reduce traffic to the
+transcript and contents
+</span><span style="font-size: 10pt"><tt>Buffers</tt></span><span style="font-size: 10pt">,
+they also clump screen updates so that complicated changes to the
+screen are achieved in
+just a few messages to the terminal.
+This saved me considerable work: I did not need to write special
+code to optimize the message traffic to the
+terminal.
+Caches pay off in surprising ways.
+Also, they tend to be independent, so their performance improvements
+are multiplicative.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Data structures in the terminal
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The terminal&rsquo;s job is to display and to maintain a consistent image of
+pieces of the files being edited.
+Because the text is always in memory, the data structures are
+considerably simpler than those in the host part.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+typically has far more windows than does
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">,
+the window system within which its Blit implementation runs.
+</span><span style="font-size: 10pt"><tt>Mux</tt></span><span style="font-size: 10pt">
+has a fairly small number of asynchronously updated windows;
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+needs a large number of synchronously updated windows that are
+usually static and often fully obscured.
+The different tradeoffs guided
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+away from the memory-intensive implementation of windows, called
+</span><span style="font-size: 10pt"><tt>Layers</tt></span><span style="font-size: 10pt">,<sup></sup></span><sup><span style="font-size: 6pt">17</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+used in
+</span><span style="font-size: 10pt"><tt>mux.</tt></span><span style="font-size: 10pt">
+Rather than depending on a complete bitmap image of the display for each window,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+regenerates the image from its in-memory text
+(stored in the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">)
+when necessary, although it will use such an image if it is available.
+Like
+</span><span style="font-size: 10pt"><tt>Layers</tt></span><span style="font-size: 10pt">,
+though,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+uses the screen bitmap as active storage in which to update the image using
+</span><span style="font-size: 10pt"><tt>bitblt</tt></span><span style="font-size: 10pt">.<sup></sup></span><sup><span style="font-size: 6pt">18,19</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+The resulting organization, pictured in Figure 6,
+has a global array of windows, called
+</span><span style="font-size: 10pt"><tt>Flayers</tt></span><span style="font-size: 10pt">,
+each of which holds an image of a piece of text held in a data structure
+called a
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">,
+which in turn represents
+a rectangular window full of text displayed in some
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">.
+Each
+</span><span style="font-size: 10pt"><tt>Flayer</tt></span><span style="font-size: 10pt">
+appears in a global list that orders them all front-to-back
+on the display, and simultaneously as an element of a per-file array
+that holds all the open windows for that file.
+The complement in the terminal of the
+</span><span style="font-size: 10pt"><tt>File</tt></span><span style="font-size: 10pt">
+on the host is called a
+</span><span style="font-size: 10pt"><tt>Text</tt></span><span style="font-size: 10pt">;
+each connects its
+</span><span style="font-size: 10pt"><tt>Flayers</tt></span><span style="font-size: 10pt">
+to the associated
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">.
+</span><span style="font-size: 10pt"></span></p><center><img src="sam3.png"></center>
+</center>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 6. Data structures in the terminal.
+</i></span><span style="font-size: 8pt"><tt>Flayers</tt></span><span style="font-size: 8pt"><i>
+are also linked together into a front-to-back list.
+</i></span><span style="font-size: 8pt"><tt>Boxes</tt></span><span style="font-size: 8pt"><i>
+are discussed in the next section.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+for a
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+contains the image of the text.
+For a fully visible window, the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+will be the screen (or at least the
+</span><span style="font-size: 10pt"><tt>Layer</tt></span><span style="font-size: 10pt">
+in which
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is being run),
+while for partially obscured windows the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+will be off-screen.
+If the window is fully obscured, the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+will be null.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+is a kind of cache.
+When making changes to the display, most of the original image will
+look the same in the final image, and the update algorithms exploit this.
+The
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+software updates the image in the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+incrementally; the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+is not just an image, it is a data structure.<sup></sup></span><sup><span style="font-size: 6pt">18,19</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+The job of the software that updates the display is therefore
+to use as much as possible of the existing image (converting the
+text from ASCII characters to pixels is expensive) in a sort of two-dimensional
+string insertion algorithm.
+The details of this process are described in the next section.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+software has no code to support overlapping windows;
+its job is to keep a single
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+up to date.
+It falls to the
+</span><span style="font-size: 10pt"><tt>Flayer</tt></span><span style="font-size: 10pt">
+software to multiplex the various
+</span><span style="font-size: 10pt"><tt>Bitmaps</tt></span><span style="font-size: 10pt">
+onto the screen.
+The problem of maintaining overlapping
+</span><span style="font-size: 10pt"><tt>Flayers</tt></span><span style="font-size: 10pt">
+is easier than for
+</span><span style="font-size: 10pt"><tt>Layers</tt></span><span style="font-size: 10pt"><sup></sup></span><sup><span style="font-size: 6pt">17</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt">
+because changes are made synchronously and because the contents of the window
+can be reconstructed from the data stored in the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">;
+the
+</span><span style="font-size: 10pt"><tt>Layers</tt></span><span style="font-size: 10pt">
+software
+makes no such assumptions.
+In
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">,
+the window being changed is almost always fully visible, because the current
+window is always fully visible, by construction.
+However, when multi-file changes are being made, or when
+more than one window is open on a file,
+it may be necessary to update partially obscured windows.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">There are three cases: the window is 
+fully visible, invisible (fully obscured), or partially visible.
+If fully visible, the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+is part of the screen, so when the
+</span><span style="font-size: 10pt"><tt>Flayer</tt></span><span style="font-size: 10pt">
+update routine calls the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+update routine, the screen will be updated directly.
+If the window is invisible,
+there is no associated
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">,
+and all that is necessary is to update the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+data structure, not the image.
+If the window is partially visible, the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+routine is called to update the image in the off-screen
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">,
+which may require regenerating it from the text of the window.
+The
+</span><span style="font-size: 10pt"><tt>Flayer</tt></span><span style="font-size: 10pt">
+code then clips this
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+against the
+</span><span style="font-size: 10pt"><tt>Bitmaps</tt></span><span style="font-size: 10pt">
+of all
+</span><span style="font-size: 10pt"><tt>Frames</tt></span><span style="font-size: 10pt">
+in front of the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+being modified, and the remainder is copied to the display.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">This is much faster than recreating the image off-screen
+for every change, or clipping all the changes made to the image
+during its update.
+Unfortunately, these caches can also consume prohibitive amounts of
+memory, so they are freed fairly liberally &mdash; after every change to the
+front-to-back order of the
+</span><span style="font-size: 10pt"><tt>Flayers</tt></span><span style="font-size: 10pt">.
+The result is that
+the off-screen
+</span><span style="font-size: 10pt"><tt>Bitmaps</tt></span><span style="font-size: 10pt">
+exist only while multi-window changes are occurring,
+which is the only time the performance improvement they provide is needed.
+Also, the user interface causes fully-obscured windows to be the
+easiest to make &mdash;
+creating a canonically sized and placed window requires only a button click
+&mdash; which reduces the need for caching still further.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Screen update
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Only two low-level primitives are needed for incremental update:
+</span><span style="font-size: 10pt"><tt>bitblt</tt></span><span style="font-size: 10pt">,
+which copies rectangles of pixels, and
+</span><span style="font-size: 10pt"><tt>string</tt></span><span style="font-size: 10pt">
+(which in turn calls
+</span><span style="font-size: 10pt"><tt>bitblt</tt></span><span style="font-size: 10pt">),
+which draws a null-terminated character string in a
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">.
+A
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+contains a list of
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">,
+each of which defines a horizontal strip of text in the window
+(see Figure 7).
+A
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+has a character string
+</span><span style="font-size: 10pt"><tt>str</tt></span><span style="font-size: 10pt">,
+and a
+</span><span style="font-size: 10pt"><tt>Rectangle</tt></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>rect</tt></span><span style="font-size: 10pt">
+that defines the location of the strip in the window.
+(The text in
+</span><span style="font-size: 10pt"><tt>str</tt></span><span style="font-size: 10pt">
+is stored in the
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+separately from the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+associated with the window&rsquo;s file, so
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+are self-contained.)
+The invariant is that
+the image of the
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+can be reproduced by calling
+</span><span style="font-size: 10pt"><tt>string</tt></span><span style="font-size: 10pt">
+with argument
+</span><span style="font-size: 10pt"><tt>str</tt></span><span style="font-size: 10pt">
+to draw the string in
+</span><span style="font-size: 10pt"><tt>rect</tt></span><span style="font-size: 10pt">,
+and the resulting picture fits perfectly within
+</span><span style="font-size: 10pt"><tt>rect</tt></span><span style="font-size: 10pt">.
+In other words, the
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+define the tiling of the window.
+The tiling may be complicated by long lines of text, which
+are folded onto the next line.
+Some editors use horizontal scrolling to avoid this complication,
+but to be comfortable this technique requires that lines not be
+</span><span style="font-size: 10pt"><i>too</i></span><span style="font-size: 10pt">
+long;
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+has no such restriction.
+Also, and perhaps more importantly, UNIX programs and terminals traditionally fold
+long lines to make their contents fully visible.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Two special kinds of
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+contain a single
+character: either a newline or a tab.
+Newlines and tabs are white space.
+A newline
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+always extends to the right edge of the window,
+forcing the following
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+to the next line.
+The width of a tab depends on where it is located:
+it forces the next
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+to begin at a tab location.
+Tabs also
+have a minimum width equivalent to a blank (blanks are
+drawn by
+</span><span style="font-size: 10pt"><tt>string</tt></span><span style="font-size: 10pt">
+and are not treated specially); newlines have a minimum width of zero.
+</span><span style="font-size: 10pt"></span></p><center><img src="sam4.png"></center>
+</center>
+<p style="margin-top: 0; margin-bottom: 0.08in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 8pt"><i>Figure 7. A line of text showing its
+</i></span><span style="font-size: 8pt"><tt>Boxes</tt></span><span style="font-size: 8pt"><i>.
+The first two blank
+</i></span><span style="font-size: 8pt"><tt>Boxes</tt></span><span style="font-size: 8pt"><i>
+contain tabs; the last contains a newline.
+Spaces are handled as ordinary characters.
+</i></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="margin-top: 0; margin-bottom: 0.02in"></p>
+
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The update algorithms always use the
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">
+image of the text (either the display or cache
+</span><span style="font-size: 10pt"><tt>Bitmap</tt></span><span style="font-size: 10pt">);
+they never examine the characters within a
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+except when the
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+needs to be split in two.
+Before a change, the window consists of a tiling of
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">;
+after the change the window is tiled differently.
+The update algorithms rearrange the tiles in place, without
+backup storage.
+The algorithms are not strictly optimal &mdash; for example, they can
+clear a pixel that is later going to be written upon &mdash;
+but they never move a tile that doesn&rsquo;t need to be moved,
+and they move each tile at most once.
+</span><span style="font-size: 10pt"><tt>Frinsert</tt></span><span style="font-size: 10pt">
+on a Blit can absorb over a thousand characters a second if the strings
+being inserted are a few tens of characters long.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Consider
+</span><span style="font-size: 10pt"><tt>frdelete</tt></span><span style="font-size: 10pt">.
+Its job is to delete a substring from a
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+and restore the image of the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">.
+The image of a substring has a peculiar shape (see Figure 2) comprising
+possibly a partial line,
+zero or more full lines,
+and possibly a final partial line.
+For reference, call this the
+</span><span style="font-size: 10pt"><i>Z-shape.
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Frdelete</tt></span><span style="font-size: 10pt">
+begins by splitting, if necessary, the
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+containing the ends of
+the substring so the substring begins and ends on
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+boundaries.
+Because the substring is being deleted, its image is not needed,
+so the Z-shape is then cleared.
+Then, tiles (that is, the images of
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">)
+are copied, using
+</span><span style="font-size: 10pt"><tt>bitblt</tt></span><span style="font-size: 10pt">,
+from immediately after the Z-shape to
+the beginning of the Z-shape,
+resulting in a new Z-shape.
+(</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+whose contents would span two lines in the new position must first be split.)
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Copying the remainder of the
+</span><span style="font-size: 10pt"><tt>Frame</tt></span><span style="font-size: 10pt">
+tile by tile
+this way will clearly accomplish the deletion but eventually,
+typically when the copying algorithm encounters a tab or newline,
+the old and new
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+coordinates of the tile
+to be copied are the same.
+This correspondence implies
+that the Z-shape has its beginning and ending edges aligned
+vertically, and a sequence of at most two
+</span><span style="font-size: 10pt"><tt>bitblts</tt></span><span style="font-size: 10pt">
+can be used to copy the remaining tiles.
+The last step is to clear out the resulting empty space at the bottom
+of the window;
+the number of lines to be cleared is the number of complete lines in the
+Z-shape closed by the final
+</span><span style="font-size: 10pt"><tt>bitblts.</tt></span><span style="font-size: 10pt">
+The final step is to merge horizontally adjacent
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+of plain text.
+The complete source to
+</span><span style="font-size: 10pt"><tt>frdelete</tt></span><span style="font-size: 10pt">
+is less than 100 lines of C.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>frinsert</tt></span><span style="font-size: 10pt">
+is more complicated because it must do four passes:
+one to construct the
+</span><span style="font-size: 10pt"><tt>Box</tt></span><span style="font-size: 10pt">
+list for the inserted string,
+one to reconnoitre,
+one to copy (in opposite order to
+</span><span style="font-size: 10pt"><tt>frdelete</tt></span><span style="font-size: 10pt">)
+the
+</span><span style="font-size: 10pt"><tt>Boxes</tt></span><span style="font-size: 10pt">
+to make the hole for the new text,
+and finally one to copy the new text into place.
+Overall, though,
+</span><span style="font-size: 10pt"><tt>frinsert</tt></span><span style="font-size: 10pt">
+has a similar flavor to
+</span><span style="font-size: 10pt"><tt>frdelete</tt></span><span style="font-size: 10pt">,
+and needn&rsquo;t be described further.
+</span><span style="font-size: 10pt"><tt>Frinsert</tt></span><span style="font-size: 10pt">
+and its subsidiary routines comprise 211 lines of C.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The terminal source code is 3024 lines of C,
+and the host source is 5797 lines.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Discussion
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>History
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">The immediate ancestor of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+was the original text editor for the Blit, called
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+inherited
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">&rsquo;s
+two-process structure and mouse language almost unchanged, but
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+suffered from several drawbacks that were addressed in the design of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">.
+The most important of these was the lack of a command language.
+Although
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+was easy to use for simple editing, it provided no direct help with
+large or repetitive editing tasks.  Instead, it provided a command to pass
+selected text through a shell pipeline,
+but this was no more satisfactory than could be expected of a stopgap measure.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Jim</tt></span><span style="font-size: 10pt">
+was written primarily as a vehicle for experimenting with a mouse-based
+interface to text, and the experiment was successful.
+</span><span style="font-size: 10pt"><tt>Jim</tt></span><span style="font-size: 10pt">
+had some spin-offs:
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">,
+the second window system for the Blit, is essentially a multiplexed
+version of the terminal part of
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">;
+and the debugger
+</span><span style="font-size: 10pt"><tt>pi</tt></span><span style="font-size: 10pt">&rsquo;s
+user interface<sup></sup></span><sup><span style="font-size: 6pt">20</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt"> was closely modeled on
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">&rsquo;s.
+But after a couple of years,
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+had become difficult to maintain and limiting to use,
+and its replacement was overdue.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">I began the design of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+by asking
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+customers what they wanted.
+This was probably a mistake; the answers were essentially a list of features
+to be found in other editors, which did not provide any of the
+guiding principles I was seeking.
+For instance, one common request was for a &lsquo;&lsquo;global substitute,&rsquo;&rsquo;
+but no one suggested how to provide it within a cut-and-paste editor.
+I was looking for a scheme that would
+support such specialized features comfortably in the context of some
+general command language.
+Ideas were not forthcoming, though, particularly given my insistence
+on removing all limits on file sizes, line lengths and so on.
+Even worse, I recognized that, since the mouse could easily
+indicate a region of the screen that was not an integral number of lines,
+the command language would best forget about newlines altogether,
+and that meant the command language had to treat the file as a single
+string, not an array of lines.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Eventually, I decided that thinking was not getting me very far and it was
+time to try building.
+I knew that the terminal part could be built easily &mdash;
+that part of
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+behaved acceptably well &mdash; and that most of the hard work was going
+to be in the host part: the file interface, command interpreter and so on.
+Moreover, I had some ideas about how the architecture of
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+could be improved without destroying its basic structure, which I liked
+in principle but which hadn&rsquo;t worked out as well as I had hoped.
+So I began by designing the file data structure,
+starting with the way
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+worked &mdash; comparable to a single structure merging
+</span><span style="font-size: 10pt"><tt>Disc</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>Buffer</tt></span><span style="font-size: 10pt">,
+which I split to make the cache more general
+&mdash; and thinking about how global substitute could be implemented.
+The answer was clearly that it had to be done in two passes,
+and the transcript-oriented implementation fell out naturally.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+was written bottom-up,
+starting from the data structures and algorithms for manipulating text,
+through the command language and up to the code for maintaining
+the display.
+In retrospect, it turned out well, but this implementation method is
+not recommended in general.
+There were several times when I had a large body of interesting code
+assembled and no clue how to proceed with it.
+The command language, in particular, took almost a year to figure out,
+but can be implemented (given what was there at the beginning of that year)
+in a day or two.  Similarly, inventing the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+data structure delayed the
+connection of the host and terminal pieces by another few months.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+took about two years to write, although only about four months were
+spent actually working on it.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Part of the design process was unusual:
+the subset of the protocol that maintains the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+was simulated, debugged
+and verified by an automatic protocol analyzer,<sup></sup></span><sup><span style="font-size: 6pt">21</span><span style="font-size: 10pt"></span></sup><span style="font-size: 10pt"> and was bug-free
+from the start.
+The rest of the protocol, concerned mostly
+with keeping menus up to date,
+was unfortunately too unwieldy for such analysis,
+and was debugged by more traditional methods, primarily
+by logging in a file all messages in and out of the host.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Reflections
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is essentially the only interactive editor used by the sixty or so members of
+the computing science research center in which I work.
+The same could not be said of
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">;
+the lack of a command language kept some people from adopting it.
+The union of a user interface as comfortable as
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">&rsquo;s
+with a command language as powerful as
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s&dagger;
+</span></p><p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.50in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">is essential to
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+success.
+When
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+was first made available to the
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+community,
+almost everyone switched to it within two or three days.
+In the months that followed, even people who had never adopted
+</span><span style="font-size: 10pt"><tt>jim</tt></span><span style="font-size: 10pt">
+started using
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+exclusively.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">To be honest,
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+still gets occasional use, but usually when
+something quick needs to be done and the overhead of
+downloading the terminal part of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+isn&rsquo;t worth the trouble.
+Also, as a &lsquo;line&rsquo; editor,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+</span><span style="font-size: 10pt"><tt>-d</tt></span><span style="font-size: 10pt">
+is a bit odd;
+when using a good old ASCII terminal, it&rsquo;s comforting to have
+a true line editor.
+But it is fair to say that
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language has displaced
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s
+for most of the complicated editing that has kept line editors
+(that is, command-driven editors) with us.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language is even fancier than
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s,
+and most
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+customers don&rsquo;t come near to using all its capabilities.
+Does it need to be so sophisticated?
+I think the answer is yes, for two reasons.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">First, the
+</span><span style="font-size: 10pt"><i>model</i></span><span style="font-size: 10pt">
+for
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language is really relatively simple, and certainly simpler than that of
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">.
+For instance, there is only one kind of textual loop in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+&mdash; the
+</span><span style="font-size: 10pt"><tt>x</tt></span><span style="font-size: 10pt">
+command &mdash;
+while
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+has three (the
+</span><span style="font-size: 10pt"><tt>g</tt></span><span style="font-size: 10pt">
+command, the global flag on substitutions, and the implicit loop over
+lines in multi-line substitutions).
+Also,
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s
+substitute command is necessary to make changes within lines, but in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+the
+</span><span style="font-size: 10pt"><tt>s</tt></span><span style="font-size: 10pt">
+command is more of a familiar convenience than a necessity;
+</span><span style="font-size: 10pt"><tt>c</tt></span><span style="font-size: 10pt">
+and
+</span><span style="font-size: 10pt"><tt>t</tt></span><span style="font-size: 10pt">
+can do all the work.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Second,
+given a community that expects an editor to be about as powerful as
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">,
+it&rsquo;s hard to see how
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+could really be much simpler and still satisfy that expectation.
+People want to do &lsquo;&lsquo;global substitutes,&rsquo;&rsquo; and most are content
+to have the recipe for that and a few other fancy changes.
+The sophistication of the command language is really just a veneer
+over a design that makes it possible to do global substitutes
+in a screen editor.
+Some people will always want something more, however, and it&rsquo;s gratifying to
+be able to provide it.
+The real power of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language comes from composability of the operators, which is by
+nature orthogonal to the underlying model.
+In other words,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is not itself complex, but it makes complex things possible.
+If you don&rsquo;t want to do anything complex, you can ignore the
+complexity altogether, and many people do so.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Sometimes I am asked the opposite question: why didn&rsquo;t I just make
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+a real programmable editor, with macros and variables and so on?
+The main reason is a matter of taste: I like the editor
+to be the same every time I use it.
+There is one technical reason, though:
+programmability in editors is largely a workaround for insufficient
+interactivity.
+Programmable editors are used to make particular, usually short-term,
+things easy to do, such as by providing shorthands for common actions.
+If things are generally easy to do in the first place,
+shorthands are not as helpful.
+</span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+makes common editing operations very easy, and the solutions to
+complex editing problems seem commensurate with the problems themselves.
+Also, the ability to edit the
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+window makes it easy to repeat commands &mdash; it only takes a mouse button click
+to execute a command again.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Pros and cons
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+has several other good points,
+and its share of problems.
+Among the good things is the idea of
+structural regular expressions,
+whose usefulness has only begun to be explored.
+They were arrived at serendipitously when I attempted to distill the essence of
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s
+way of doing global substitution and recognized that the looping command in
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+was implicitly imposing a structure (an array of lines) on the file.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Another of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+good things is its undo capability.
+I had never before used an editor with a true undo,
+but I would never go back now.
+Undo
+</span><span style="font-size: 10pt"><i>must</i></span><span style="font-size: 10pt">
+be done well, but if it is, it can be relied on.
+For example,
+it&rsquo;s safe to experiment if you&rsquo;re not sure how to write some intricate command,
+because if you make a mistake, it can be fixed simply and reliably.
+I learned two things about undo from writing
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">:
+first, it&rsquo;s easy to provide if you design it in from the beginning, and
+second, it&rsquo;s necessary, particularly if the system has some subtle
+properties that may be unfamiliar or error-prone for users.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">&rsquo;s
+lack of internal limits and sizes is a virtue.
+Because it avoids all fixed-size tables and data structures,
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is able to make global changes to files that some of our other
+tools cannot even read.
+Moreover, the design keeps the performance linear when doing such
+operations, although I must admit
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+does get slow when editing a huge file.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Now, the problems.
+Externally, the most obvious is that it is poorly integrated into the
+surrounding window system.
+By design, the user interface in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+feels almost identical to that of
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">,
+but a thick wall separates text in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+from the programs running in
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">.
+For instance, the &lsquo;snarf buffer&rsquo; in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+must be maintained separately from that in
+</span><span style="font-size: 10pt"><tt>mux</tt></span><span style="font-size: 10pt">.
+This is regrettable, but probably necessary given the unusual configuration
+of the system, with a programmable terminal on the far end of an RS-232 link.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"></span><span style="font-size: 10pt"><tt>Sam</tt></span><span style="font-size: 10pt">
+is reliable; otherwise, people wouldn&rsquo;t use it.
+But it was written over such a long time, and has so many new (to me)
+ideas in it, that I would like to see it done over again to clean
+up the code and remove many of the lingering problems in the implementation.
+The worst part is in the interconnection of the host and terminal parts,
+which might even be able to go away in a redesign for a more
+conventional window system.
+The program must be split in two to use the terminal effectively,
+but the low bandwidth of the connection forces the separation to
+occur in an inconvenient part of the design if performance is to be acceptable.
+A simple remote procedure call
+protocol driven by the host, emitting only graphics
+commands, would be easy to write but wouldn&rsquo;t have nearly the
+necessary responsiveness.  On the other hand, if the terminal were in control
+and requested much simpler file services from the host, regular expression
+searches would require that the terminal read the entire file over its RS-232
+link, which would be unreasonably slow.
+A compromise in which either end can take control is necessary.
+In retrospect, the communications protocol should have been
+designed and verified formally, although I do not know of any tool
+that can adequately relate the protocol to
+its implementation.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Not all of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+users are comfortable with its command language, and few are adept.
+Some (venerable) people use a sort of
+&lsquo;&lsquo;</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+subset&rsquo;&rsquo; of
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language,
+and even ask why
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+command language is not exactly
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s.
+(The reason, of course, is that
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+model for text does not include newlines, which are central to
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">.
+Making the text an array of newlines to the command language would
+be too much of a break from the seamless model provided by the mouse.
+Some editors, such as
+</span><span style="font-size: 10pt"><tt>vi</tt></span><span style="font-size: 10pt">,
+are willing to make this break, though.)
+The difficulty is that
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">&rsquo;s
+syntax is so close to
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">&rsquo;s
+that people believe it
+</span><span style="font-size: 10pt"><i>should</i></span><span style="font-size: 10pt">
+be the same.
+I thought, with some justification in hindsight,
+that making
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+similar to
+</span><span style="font-size: 10pt"><tt>ed</tt></span><span style="font-size: 10pt">
+would make it easier to learn and to accept.
+But I may have overstepped and raised the users&rsquo;
+expectations too much.
+It&rsquo;s hard to decide which way to resolve this problem.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.35in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Finally, there is a tradeoff in
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+that was decided by the environment in which it runs:
+</span><span style="font-size: 10pt"><tt>sam</tt></span><span style="font-size: 10pt">
+is a multi-file editor, although in a different system there might instead be
+multiple single-file editors.
+The decision was made primarily because starting a new program in a Blit is
+time-consuming.
+If the choice could be made freely, however, I would
+still choose the multi-file architecture, because it allows
+groups of files to be handled as a unit;
+the usefulness of the multi-file commands is incontrovertible.
+It is delightful to have the source to an entire program
+available at your fingertips.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>Acknowledgements
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">Tom Cargill suggested the idea behind the
+</span><span style="font-size: 10pt"><tt>Rasp</tt></span><span style="font-size: 10pt">
+data structure.
+Norman Wilson and Ken Thompson influenced the command language.
+This paper was improved by comments from
+Al Aho,
+Jon Bentley,
+Chris Fraser,
+Gerard Holzmann,
+Brian Kernighan,
+Ted Kowalski,
+Doug McIlroy
+and
+Dennis Ritchie.
+</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"><b>REFERENCES
+</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 1.    R. Pike,
+&lsquo;The Blit: a multiplexed graphics terminal,&rsquo;
+</span><span style="font-size: 10pt"><i>AT&amp;T Bell Labs. Tech. J.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>63</b></span><span style="font-size: 10pt">,
+(8),
+1607-1631 (1984).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 2.    L. Johnson,
+</span><span style="font-size: 10pt"><i>MacWrite,</i></span><span style="font-size: 10pt">
+Apple Computer Inc., Cupertino, Calif. 1983.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 3.    B. Lampson,
+&lsquo;Bravo Manual,&rsquo;
+in
+</span><span style="font-size: 10pt"><i>Alto User&rsquo;s Handbook,
+</i></span><span style="font-size: 10pt">pp. 31-62,
+Xerox Palo Alto Research Center,
+Palo Alto, Calif.
+1979.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 4.    W. Teitelman,
+&lsquo;A tour through Cedar,&rsquo;
+</span><span style="font-size: 10pt"><i>IEEE Software,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>1</b></span><span style="font-size: 10pt">
+(2), 44-73 (1984).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 5.    J. Gutknecht,
+&lsquo;Concepts of the text editor Lara,&rsquo;
+</span><span style="font-size: 10pt"><i>Comm. ACM,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>28</b></span><span style="font-size: 10pt">,
+(9),
+942-960 (1985).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 6.    Bell Telephone Laboratories,
+</span><span style="font-size: 10pt"><i>UNIX Programmer&rsquo;s Manual,
+</i></span><span style="font-size: 10pt">Holt, Rinehart and Winston, New York 1983.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 7.    B. W. Kernighan and R. Pike,
+</span><span style="font-size: 10pt"><i>The Unix Programming Environment,
+</i></span><span style="font-size: 10pt">Prentice-Hall, Englewood Cliffs, New Jersey 1984.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 8.    </span><span style="font-size: 10pt"><i>Unix Time-Sharing System Programmer&rsquo;s Manual, Research Version, Ninth Edition,
+Volume 1,
+</i></span><span style="font-size: 10pt">AT&amp;T Bell Laboratories, Murray Hill, New Jersey 1986.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt"> 9.    </span><span style="font-size: 10pt"><i>Unix Time-Sharing System Programmer&rsquo;s Manual, 4.1 Berkeley Software Distribution,
+Volumes 1 and 2C,
+</i></span><span style="font-size: 10pt">University of California, Berkeley, Calif. 1981.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">10.    R. Pike,
+&lsquo;Structural Regular Expressions,&rsquo;
+</span><span style="font-size: 10pt"><i>Proc. EUUG Spring Conf., Helsinki 1987,
+</i></span><span style="font-size: 10pt">Eur. Unix User&rsquo;s Group, Buntingford, Herts, UK 1987.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">11.    A. Goldberg,
+</span><span style="font-size: 10pt"><i>Smalltalk-80 &ndash; The Interactive Programming Environment,
+</i></span><span style="font-size: 10pt">Addison-Wesley, Reading, Mass. 1984.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">12.    K. Thompson,
+&lsquo;Regular expression search algorithm,&rsquo;
+</span><span style="font-size: 10pt"><i>Comm. ACM,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>11</b></span><span style="font-size: 10pt">,
+(6),
+419-422 (1968).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">13.    A. V. Aho, J. E. Hopcroft and J. D. Ullman,
+</span><span style="font-size: 10pt"><i>The Design and Analysis of Computer Algorithms,
+</i></span><span style="font-size: 10pt">Addison-Wesley, Reading, Mass. 1974.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">14.    B. W. Kernighan and D. M. Ritchie,
+</span><span style="font-size: 10pt"><i>The C Programming Language,
+</i></span><span style="font-size: 10pt">Prentice-Hall, Englewood Cliffs, New Jersey 1978.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">15.    W. M. Waite,
+&lsquo;The cost of lexical analysis,&rsquo;
+</span><span style="font-size: 10pt"><i>Softw. Pract. Exp.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>16</b></span><span style="font-size: 10pt">,
+(5),
+473-488 (1986).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">16.    C. W. Fraser,
+&lsquo;A generalized text editor,&rsquo;
+</span><span style="font-size: 10pt"><i>Comm. ACM,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>23</b></span><span style="font-size: 10pt">,
+(3),
+154-158 (1980).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">17.    R. Pike,
+&lsquo;Graphics in overlapping bitmap layers,&rsquo;
+</span><span style="font-size: 10pt"><i>ACM Trans. on Graph.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>2</b></span><span style="font-size: 10pt">,
+(2)
+135-160 (1983).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">18.    L. J. Guibas and J. Stolfi,
+&lsquo;A language for bitmap manipulation,&rsquo;
+</span><span style="font-size: 10pt"><i>ACM Trans. on Graph.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>1</b></span><span style="font-size: 10pt">,
+(3),
+191-214 (1982).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">19.    R. Pike, B. Locanthi and J. Reiser,
+&lsquo;Hardware/software trade-offs for bitmap graphics on the Blit,&rsquo;
+</span><span style="font-size: 10pt"><i>Softw. Pract. Exp.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>15</b></span><span style="font-size: 10pt">,
+(2),
+131-151 (1985).
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">20.    T. A. Cargill,
+&lsquo;The feel of Pi,&rsquo;
+</span><span style="font-size: 10pt"><i>Winter USENIX Conference Proceedings,
+Denver 1986,
+</i></span><span style="font-size: 10pt">62-71,
+USENIX Assoc., El Cerrito, CA.
+</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
+<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
+<span style="font-size: 10pt">21.    G. J. Holzmann,
+&lsquo;Tracing protocols,&rsquo;
+</span><span style="font-size: 10pt"><i>AT&amp;T Tech. J.,
+</i></span><span style="font-size: 10pt"></span><span style="font-size: 10pt"><b>64</b></span><span style="font-size: 10pt">,
+(10),
+2413-2434 (1985).
+</span></p><p style="margin-top: 0; margin-bottom: 0.50in"></p>
+</body>
+</html>
+
diff --git a/sys/doc/sam/sam.ms b/sys/doc/sam/sam.ms
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+.HTML "The Text Editor sam
+.Vx 17 11 November 87 1 32 "ROB PIKE" "THE TEXT EDITOR SAM"
+.ds DY "31 May 1987
+.ds DR "Revised 1 July 1987
+.de CW		\" puts first arg in CW font, same as UL; maintains font
+\%\&\\$3\f(CW\\$1\fP\&\\$2
+..
+.de Cs
+.br
+.fi
+.ft 2
+.ps -2
+.vs -2
+..
+.de Ce
+.br
+.nf
+.ft 1
+.ps
+.vs
+.sp
+..
+.de XP
+.ie h .html - <center><img src="\\$1.gif" /></center>
+.el .BP \\$1.ps \\$2
+..
+.TL
+The Text Editor \&\f(CWsam\fP
+.AU
+Rob Pike
+rob@plan9.bell-labs.com
+.AB
+.LP
+.CW Sam
+is an interactive multi-file text editor intended for
+bitmap displays.
+A textual command language
+supplements the mouse-driven, cut-and-paste interface
+to make complex or
+repetitive editing tasks easy to specify.
+The language is characterized by the composition of regular expressions
+to describe the structure of the text being modified.
+The treatment of files as a database, with changes logged
+as atomic transactions, guides the implementation and
+makes a general `undo' mechanism straightforward.
+.PP
+.CW Sam
+is implemented as two processes connected by a low-bandwidth stream,
+one process handling the display and the other the editing
+algorithms.  Therefore it can run with the display process
+in a bitmap terminal and the editor on a local host,
+with both processes on a bitmap-equipped host, or with
+the display process in the terminal and the editor in a
+remote host.
+By suppressing the display process,
+it can even run without a bitmap terminal.
+.PP
+This paper is reprinted from Software\(emPractice and Experience,
+Vol 17, number 11, pp. 813-845, November 1987.
+The paper has not been updated for the Plan 9 manuals.  Although
+.CW Sam
+has not changed much since the paper was written, the system around it certainly has.
+Nonetheless, the description here still stands as the best introduction to the editor.
+.AE
+.SH
+Introduction
+.LP
+.CW Sam
+is an interactive text editor that combines cut-and-paste interactive editing with
+an unusual command language based on the composition of regular expressions.
+It is written as two programs: one, the `host part,' runs on a UNIX system
+and implements the command language and provides file access; the other, the
+`terminal part,' runs asynchronously
+on a machine with a mouse and bitmap display
+and supports the display and interactive editing.
+The host part may be even run in isolation on an ordinary terminal
+to edit text using the command
+language, much like a traditional line editor,
+without assistance from a mouse or display.
+Most often,
+the terminal part runs on a Blit\u\s-4\&1\s+4\d terminal
+(actually on a Teletype DMD 5620, the production version of the Blit), whose
+host connection is an ordinary 9600 bps RS232 link;
+on the SUN computer the host and display processes run on a single machine,
+connected by a pipe.
+.PP
+.CW Sam
+edits uninterpreted
+ASCII text.
+It has no facilities for multiple fonts, graphics or tables,
+unlike MacWrite,\u\s-4\&2\s+4\d Bravo,\u\s-4\&3\s+4\d Tioga\u\s-4\&4\s+4\d
+or Lara.\u\s-4\&5\s+4\d
+Also unlike them, it has a rich command language.
+(Throughout this paper, the phrase
+.I
+command language
+.R
+refers to
+textual commands; commands activated from the mouse form the
+.I mouse
+.I language. )
+.CW Sam
+developed as an editor for use by programmers, and tries to join
+the styles of the UNIX text editor
+.CW ed \u\s-4\&6,7\s+4\d
+with that of interactive cut-and-paste editors by
+providing a comfortable mouse-driven interface
+to a program with a solid command language driven by regular expressions.
+The command language developed more than the mouse language, and
+acquired a notation for describing the structure of files
+more richly than as a sequence of lines,
+using a dataflow-like syntax for specifying changes.
+.PP
+The interactive style was influenced by
+.CW jim ,\u\s-4\&1\s+4\d
+an early cut-and-paste editor for the Blit, and by
+.CW mux ,\u\s-4\&8\s+4\d
+the Blit window system.
+.CW Mux
+merges the original Blit window system,
+.CW mpx ,\u\s-4\&1\s+4\d
+with cut-and-paste editing, forming something like a
+multiplexed version of
+.CW jim
+that edits the output of (and input to) command sessions rather than files.
+.PP
+The first part of this paper describes the command language, then the mouse
+language, and explains how they interact.
+That is followed by a description of the implementation,
+first of the host part, then of the terminal part.
+A principle that influenced the design of
+.CW sam
+is that it should have no explicit limits, such as upper limits on
+file size or line length.
+A secondary consideration is that it be efficient.
+To honor these two goals together requires a method for efficiently
+manipulating
+huge strings (files) without breaking them into lines,
+perhaps while making thousands of changes
+under control of the command language.
+.CW Sam 's
+method is to
+treat the file as a transaction database, implementing changes as atomic
+updates.  These updates may be unwound easily to `undo' changes.
+Efficiency is achieved through a collection of caches that minimizes
+disc traffic and data motion, both within the two parts of the program
+and between them.
+.PP
+The terminal part of
+.CW sam
+is fairly straightforward.
+More interesting is how the two halves of the editor stay
+synchronized when either half may initiate a change.
+This is achieved through a data structure that organizes the
+communications and is maintained in parallel by both halves.
+.PP
+The last part of the paper chronicles the writing of
+.CW sam
+and discusses the lessons that were learned through its development and use.
+.PP
+The paper is long, but is composed largely of two papers of reasonable length:
+a description of the user interface of
+.CW sam
+and a discussion of its implementation.
+They are combined because the implementation is strongly influenced by
+the user interface, and vice versa.
+.SH
+The Interface
+.LP
+.CW Sam
+is a text editor for multiple files.
+File names may be provided when it is invoked:
+.P1
+sam file1 file2 ...
+.P2
+and there are commands
+to add new files and discard unneeded ones.
+Files are not read until necessary
+to complete some command.
+Editing operations apply to an internal copy
+made when the file is read; the UNIX file associated with the copy
+is changed only by an explicit command.
+To simplify the discussion, the internal copy is here called a
+.I file ,
+while the disc-resident original is called a
+.I
+disc file.
+.R
+.PP
+.CW Sam
+is usually connected to a bitmap display that presents a cut-and-paste
+editor driven by the mouse.
+In this mode, the command language is still available:
+text typed in a special window, called the
+.CW sam
+.I window,
+is interpreted
+as commands to be executed in the current file.
+Cut-and-paste editing may be used in any window \(em even in the
+.CW sam
+window to construct commands.
+The other mode of operation, invoked by starting
+.CW sam
+with the option
+.CW -d
+(for `no download'),
+does not use the mouse or bitmap display, but still permits
+editing using the textual command language, even on an ordinary terminal,
+interactively or from a script.
+.PP
+The following sections describe first the command language (under
+.CW sam\ -d
+and in the
+.CW sam
+window), and then the mouse interface.
+These two languages are nearly independent, but connect through the
+.I current
+.I text,
+described below.
+.SH 2
+The Command Language
+.LP
+A file consists of its contents, which are an array of characters
+(that is, a string); the
+.I name
+of the associated disc file; the
+.I
+modified bit
+.R
+that states whether the contents match those of
+the disc file;
+and a substring of the contents, called the
+.I
+current text
+.R
+or
+.I dot
+(see Figures 1 and 2).
+If the current text is a null string, dot falls between characters.
+The
+.I value
+of dot is the location of the current text; the
+.I contents
+of dot are the characters it contains.
+.CW Sam
+imparts to the text no two-dimensional interpretation such as columns
+or fields; text is always one-dimensional.
+Even the idea of a `line' of text as understood by most UNIX programs
+\(em a sequence of characters terminated by a newline character \(em
+is only weakly supported.
+.PP
+The
+.I
+current file
+.R
+is the file to which editing commands refer.
+The current text is therefore dot in the current file.
+If a command doesn't explicitly name a particular file or piece of text,
+the command is assumed to apply to the current text.
+For the moment, ignore the presence of multiple files and consider
+editing a single file.
+.KF L
+.XP fig1 3.5i
+.Cs
+Figure 1. A typical
+.CW sam
+screen, with the editing menu presented.
+The
+.CW sam
+(command language) window is in the middle, with file windows above and below.
+(The user interface makes it easy to create these abutting windows.)
+The partially obscured window is a third file window.
+The uppermost window is that to which typing and mouse operations apply,
+as indicated by its heavy border.
+Each window has its current text highlighted in reverse video.
+The
+.CW sam
+window's current text is the null string on the last visible line,
+indicated by a vertical bar.
+See also Figure 2.
+.Ce
+.KE
+.PP
+Commands have one-letter names.
+Except for non-editing commands such as writing
+the file to disc, most commands make some change
+to the text in dot and leave dot set to the text resulting from the change.
+For example, the delete command,
+.CW d ,
+deletes the text in dot, replacing it by the null string and setting dot
+to the result.
+The change command,
+.CW c ,
+replaces dot by text delimited by an arbitrary punctuation character,
+conventionally
+a slash.  Thus,
+.P1
+c/Peter/
+.P2
+replaces the text in dot by the string
+.CW Peter .
+Similarly,
+.P1
+a/Peter/
+.P2
+(append) adds the string after dot, and
+.P1
+i/Peter/
+.P2
+(insert) inserts before dot.
+All three leave dot set to the new text,
+.CW Peter .
+.PP
+Newlines are part of the syntax of commands:
+the newline character lexically terminates a command.
+Within the inserted text, however, newlines are never implicit.
+But since it is often convenient to insert multiple lines of text,
+.CW sam
+has a special
+syntax for that case:
+.P1
+a
+some lines of text
+to be inserted in the file,
+terminated by a period
+on a line by itself
+\&.
+.P2
+In the one-line syntax, a newline character may be specified by a C-like
+escape, so
+.P1
+c/\en/
+.P2
+replaces dot by a single newline character.
+.PP
+.CW Sam
+also has a substitute command,
+.CW s :
+.P1
+s/\f2expression\fP/\f2replacement\fP/
+.P2
+substitutes the replacement text for the first match, in dot,
+of the regular expression.
+Thus, if dot is the string
+.CW Peter ,
+the command
+.P1
+s/t/st/
+.P2
+changes it to
+.CW Pester .
+In general,
+.CW s
+is unnecessary, but it was inherited from
+.CW ed
+and it has some convenient variations.
+For instance, the replacement text may include the matched text,
+specified by
+.CW & :
+.P1
+s/Peter/Oh, &, &, &, &!/
+.P2
+.PP
+There are also three commands that apply programs
+to text:
+.P1
+< \f2UNIX program\fP
+.P2
+replaces dot by the output of the UNIX program.
+Similarly, the
+.CW >
+command
+runs the program with dot as its standard input, and
+.CW |
+does both.  For example,
+.P1
+| sort
+.P2
+replaces dot by the result of applying the standard sorting utility to it.
+Again, newlines have no special significance for these
+.CW sam
+commands.
+The text acted upon and resulting from these commands is not necessarily
+bounded by newlines, although for connection with UNIX programs,
+newlines may be necessary to obey conventions.
+.PP
+One more command:
+.CW p
+prints the contents of dot.
+Table I summarizes
+.CW sam 's
+commands.
+.KF
+.TS
+center;
+c s
+lfCW l.
+Table I. \f(CWSam\fP commands
+.sp .4
+.ft CW
+_
+.ft
+.sp .4
+\f1Text commands\fP	
+.sp .4
+_
+.sp .4
+a/\f2text\fP/	Append text after dot
+c/\f2text\fP/	Change text in dot
+i/\f2text\fP/	Insert text before dot
+d	Delete text in dot
+s/\f2regexp\fP/\f2text\fP/	Substitute text for match of regular expression in dot
+m \f2address\fP	Move text in dot after address
+t \f2address\fP	Copy text in dot after address
+.sp .4
+_
+.sp .4
+\f1Display commands\fP	
+.sp .4
+_
+.sp .2
+p	Print contents of dot
+\&=	Print value (line numbers and character numbers) of dot
+.sp .4
+_
+.sp .4
+\f1File commands\fP
+.sp .4
+_
+.sp .2
+b \f2file-list\fP	Set current file to first file in list that \f(CWsam\fP has in menu
+B \f2file-list\fP	Same as \f(CWb\fP, but load new files
+n	Print menu lines of all files
+D \f2file-list\fP	Delete named files from \f(CWsam\fP
+.sp .4
+_
+.sp .4
+\f1I/O commands\fP	
+.sp .4
+_
+.sp .2
+e \f2filename\fP	Replace file with named disc file
+r \f2filename\fP	Replace dot by contents of named disc file
+w \f2filename\fP	Write file to named disc file
+f \f2filename\fP	Set file name and print new menu line
+< \f2UNIX-command\fP	Replace dot by standard output of command
+> \f2UNIX-command\fP	Send dot to standard input of command
+| \f2UNIX-command\fP	Replace dot by result of command applied to dot
+! \f2UNIX-command\fP	Run the command
+.sp .4
+_
+.sp .4
+\f1Loops and conditionals\fP	
+.sp .4
+_
+.sp .2
+x/\f2regexp\fP/ \f2command\fP	For each match of regexp, set dot and run command
+y/\f2regexp\fP/ \f2command\fP	Between adjacent matches of regexp, set dot and run command
+X/\f2regexp\fP/ \f2command\fP	Run command in each file whose menu line matches regexp
+Y/\f2regexp\fP/ \f2command\fP	Run command in each file whose menu line does not match
+g/\f2regexp\fP/ \f2command\fP	If dot contains a match of regexp, run command
+v/\f2regexp\fP/ \f2command\fP	If dot does not contain a match of regexp, run command
+.sp .4
+_
+.sp .4
+\f1Miscellany\fP	
+.sp .4
+_
+.sp .2
+k	Set address mark to value of dot
+q	Quit
+u \f2n\fP	Undo last \f2n\fP (default 1) changes
+{ }	Braces group commands
+.sp .3
+.ft CW
+_
+.ft
+.TE
+.sp
+.KE
+.PP
+The value of dot may be changed by
+specifying an
+.I address
+for the command.
+The simplest address is a line number:
+.P1
+3
+.P2
+refers to the third line of the file, so
+.P1
+3d
+.P2
+deletes the third line of the file, and implicitly renumbers
+the lines so the old line 4 is now numbered 3.
+(This is one of the few places where
+.CW sam
+deals with lines directly.)
+Line
+.CW 0
+is the null string at the beginning of the file.
+If a command consists of only an address, a
+.CW p
+command is assumed, so typing an unadorned
+.CW 3
+prints line 3 on the terminal.
+There are a couple of other basic addresses:
+a period addresses dot itself; and
+a dollar sign
+.CW $ ) (
+addresses the null string at the end of the file.
+.PP
+An address is always a single substring of the file.
+Thus, the address
+.CW 3
+addresses the characters
+after the second newline of
+the file through the third newline of the file.
+A
+.I
+compound address
+.R
+is constructed by the comma operator
+.P1
+\f2address1\fP,\f2address2\fP
+.P2
+and addresses the substring of the file from the beginning of
+.I address1
+to the end of
+.I address2 .
+For example, the command
+.CW 3,5p
+prints the third through fifth lines of the file and
+.CW .,$d
+deletes the text from the beginning of dot to the end of the file.
+.PP
+These addresses are all absolute positions in the file, but
+.CW sam
+also has relative addresses, indicated by
+.CW +
+or
+.CW - .
+For example,
+.P1
+$-3
+.P2
+is the third line before the end of the file and
+.P1
+\&.+1
+.P2
+is the line after dot.
+If no address appears to the left of the
+.CW +
+or
+.CW - ,
+dot is assumed;
+if nothing appears to the right,
+.CW 1
+is assumed.
+Therefore,
+.CW .+1
+may be abbreviated to just a plus sign.
+.PP
+The
+.CW +
+operator acts relative to the end of its first argument, while the
+.CW -
+operator acts relative to the beginning.  Thus
+.CW .+1
+addresses the first line after dot,
+.CW .-
+addresses the first line before dot, and
+.CW +-
+refers to the line containing the end of dot.  (Dot may span multiple lines, and
+.CW +
+selects the line after the end of dot, then
+.CW -
+backs up one line.)
+.PP
+The final type of address is a regular expression, which addresses the
+text matched by the expression.  The expression is enclosed in slashes, as in
+.P1
+/\f2expression\fP/
+.P2
+The expressions are the same as those in the UNIX program
+.CW egrep ,\u\s-4\&6,7\s+4\d
+and include closures, alternations, and so on.
+They find the
+.I
+leftmost longest
+.R
+string that matches the expression, that is,
+the first match after the point where the search is started,
+and if more than one match begins at the same spot, the longest such match.
+(I assume familiarity with the syntax for regular expressions in UNIX programs.\u\s-4\&9\s+4\d)
+For example,
+.P1
+/x/
+.P2
+matches the next
+.CW x
+character in the file,
+.P1
+/xx*/
+.P2
+matches the next run of one or more
+.CW x 's,
+and
+.P1
+/x|Peter/
+.P2
+matches the next
+.CW x
+or
+.CW Peter .
+For compatibility with other UNIX programs, the `any character' operator,
+a period,
+does not match a newline, so
+.P1
+/.*/
+.P2
+matches the text from dot to the end of the line, but excludes the newline
+and so will not match across
+the line boundary.
+.PP
+Regular expressions are always relative addresses.
+The direction is forwards by default,
+so
+.CW /Peter/
+is really an abbreviation for
+.CW +/Peter/ .
+The search can be reversed with a minus sign, so
+.P1
+.CW -/Peter/
+.P2
+finds the first
+.CW Peter
+before dot.
+Regular expressions may be used with other address forms, so
+.CW 0+/Peter/
+finds the first
+.CW Peter
+in the file and
+.CW $-/Peter/
+finds the last.
+Table II summarizes
+.CW sam 's
+addresses.
+.KF
+.TS
+center;
+c s
+lfCW l.
+Table II. \f(CWSam\fP addresses
+.sp .4
+.ft CW
+_
+.ft
+.sp .4
+\f1Simple addresses\fP	
+.sp .4
+_
+.sp .2
+#\f2n\fP	The empty string after character \f2n\fP
+\f2n\fP	Line \f2n\fP.
+/\f2regexp\fP/	The first following match of the regular expression
+-/\f2regexp\fP/	The first previous match of the regular expression
+$	The null string at the end of the file
+\&.	Dot
+\&'	The address mark, set by \f(CWk\fP command
+"\f2regexp\fP"	Dot in the file whose menu line matches regexp
+.sp .4
+_
+.sp .4
+\f1Compound addresses\fP	
+.sp .4
+_
+.sp .2
+\f2a1\fP+\f2a2\fP	The address \f2a2\fP evaluated starting at right of \f2a1\fP
+\f2a1\fP-\f2a2\fP	\f2a2\fP evaluated in the reverse direction starting at left of \f2a1\fP
+\f2a1\fP,\f2a2\fP	From the left of \f2a1\fP to the right of \f2a2\fP (default \f(CW0,$\fP)
+\f2a1\fP;\f2a2\fP	Like \f(CW,\fP but sets dot after evaluating \f2a1\fP
+.sp .4
+_
+.sp .4
+.T&
+c s.
+T{
+The operators
+.CW +
+and
+.CW -
+are high precedence, while
+.CW ,
+and
+.CW ;
+are low precedence.
+In both
+.CW +
+and
+.CW -
+forms,
+.I a2
+defaults to 1 and
+.I a1
+defaults to dot.
+If both
+.I a1
+and
+.I a2
+are present,
+.CW +
+may be elided.
+T}
+.sp .5
+.ft CW
+_
+.ft
+.TE
+.sp
+.KE
+.PP
+The language discussed so far will not seem novel
+to people who use UNIX text editors
+such as
+.CW ed
+or
+.CW vi .\u\s-4\&9\s+4\d
+Moreover, the kinds of editing operations these commands allow, with the exception
+of regular expressions and line numbers,
+are clearly more conveniently handled by a mouse-based interface.
+Indeed,
+.CW sam 's
+mouse language (discussed at length below) is the means by which
+simple changes are usually made.
+For large or repetitive changes, however, a textual language
+outperforms a manual interface.
+.PP
+Imagine that, instead of deleting just one occurrence of the string
+.CW Peter ,
+we wanted to eliminate every
+.CW Peter .
+What's needed is an iterator that runs a command for each occurrence of some
+text.
+.CW Sam 's
+iterator is called
+.CW x ,
+for extract:
+.P1
+x/\f2expression\fP/ \f2command\fP
+.P2
+finds all matches in dot of the specified expression, and for each
+such match, sets dot to the text matched and runs the command.
+So to delete all the
+.CW Peters:
+.P1
+0,$ x/Peter/ d
+.P2
+(Blanks in these examples are to improve readability;
+.CW sam
+neither requires nor interprets them.)
+This searches the entire file
+.CW 0,$ ) (
+for occurrences of the string
+.CW Peter ,
+and runs the
+.CW d
+command with dot set to each such occurrence.
+(By contrast, the comparable
+.CW ed
+command would delete all
+.I lines
+containing
+.CW Peter ;
+.CW sam
+deletes only the
+.CW Peters .)
+The address
+.CW 0,$
+is commonly used, and may be abbreviated to just a comma.
+As another example,
+.P1
+, x/Peter/ p
+.P2
+prints a list of
+.CW Peters,
+one for each appearance in the file, with no intervening text (not even newlines
+to separate the instances).
+.PP
+Of course, the text extracted by
+.CW x
+may be selected by a regular expression,
+which complicates deciding what set of matches is chosen \(em
+matches may overlap.  This is resolved by generating the matches
+starting from the beginning of dot using the leftmost-longest rule,
+and searching for each match starting from the end of the previous one.
+Regular expressions may also match null strings, but a null match
+adjacent to a non-null match is never selected; at least one character
+must intervene.
+For example,
+.P1
+, c/AAA/
+x/B*/ c/-/
+, p
+.P2
+produces as output
+.P1
+-A-A-A-
+.P2
+because the pattern
+.CW B*
+matches the null strings separating the
+.CW A 's.
+.PP
+The
+.CW x
+command has a complement,
+.CW y ,
+with similar syntax, that executes the command with dot set to the text
+.I between
+the matches of the expression.
+For example,
+.P1
+, c/AAA/
+y/A/ c/-/
+, p
+.P2
+produces the same result as the example above.
+.PP
+The
+.CW x
+and
+.CW y
+commands are looping constructs, and
+.CW sam
+has a pair of conditional commands to go with them.
+They have similar syntax:
+.P1
+g/\f2expression\fP/ \f2command\fP
+.P2
+(guard)
+runs the command exactly once if dot contains a match of the expression.
+This is different from
+.CW x ,
+which runs the command for
+.I each
+match:
+.CW x
+loops;
+.CW g
+merely tests, without changing the value of dot.
+Thus,
+.P1
+, x/Peter/ d
+.P2
+deletes all occurrences of
+.CW Peter ,
+but
+.P1
+, g/Peter/ d
+.P2
+deletes the whole file (reduces it to a null string) if
+.CW Peter
+occurs anywhere in the text.
+The complementary conditional is
+.CW v ,
+which runs the command if there is
+.I no
+match of the expression.
+.PP
+These control-structure-like commands may be composed to construct more
+involved operations.  For example, to print those lines of text that
+contain the string
+.CW Peter :
+.P1
+, x/.*\en/ g/Peter/ p
+.P2
+The
+.CW x
+breaks the file into lines, the
+.CW g
+selects those lines containing
+.CW Peter ,
+and the
+.CW p
+prints them.
+This command gives an address for the
+.CW x
+command (the whole file), but because
+.CW g
+does not have an explicit address, it applies to the value of
+dot produced by the
+.CW x
+command, that is, to each line.
+All commands in
+.CW sam
+except for the command to write a file to disc use dot for the
+default address.
+.PP
+Composition may be continued indefinitely.
+.P1
+, x/.*\en/ g/Peter/ v/SaltPeter/ p
+.P2
+prints those lines containing
+.CW Peter
+but
+.I not
+those containing
+.CW SaltPeter .
+.SH 2
+Structural Regular Expressions
+.LP
+Unlike other UNIX text editors,
+including the non-interactive ones such as
+.CW sed
+and
+.CW awk ,\u\s-4\&7\s+4\d
+.CW sam
+is good for manipulating files with multi-line `records.'
+An example is an on-line phone book composed of records,
+separated by blank lines, of the form
+.P1
+Herbert Tic
+44 Turnip Ave., Endive, NJ
+201-5555642
+
+Norbert Twinge
+16 Potato St., Cabbagetown, NJ
+201-5553145
+
+\&...
+.P2
+The format may be encoded as a regular expression:
+.P1
+(.+\en)+
+.P2
+that is, a sequence of one or more non-blank lines.
+The command to print Mr. Tic's entire record is then
+.P1
+, x/(.+\en)+/ g/^Herbert Tic$/ p
+.P2
+and that to extract just the phone number is
+.P1
+, x/(.+\en)+/ g/^Herbert Tic$/ x/^[0-9]*-[0-9]*\en/ p
+.P2
+The latter command breaks the file into records,
+chooses Mr. Tic's record,
+extracts the phone number from the record,
+and finally prints the number.
+.PP
+A more involved problem is that of
+renaming a particular variable, say
+.CW n ,
+to
+.CW num
+in a C program.
+The obvious first attempt,
+.P1
+, x/n/ c/num/
+.P2
+is badly flawed: it changes not only the variable
+.CW n
+but any letter
+.CW n
+that appears.
+We need to extract all the variables, and select those that match
+.CW n
+and only
+.CW n :
+.P1
+, x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/
+.P2
+The pattern
+.CW [A-Za-z_][A-Za-z_0-9]*
+matches C identifiers.
+Next
+.CW g/n/
+selects those containing an
+.CW n .
+Then
+.CW v/../
+rejects those containing two (or more) characters, and finally
+.CW c/num/
+changes the remainder (identifiers
+.CW n )
+to
+.CW num .
+This version clearly works much better, but there may still be problems.
+For example, in C character and string constants, the sequence
+.CW \en
+is interpreted as a newline character, and we don't want to change it to
+.CW \enum.
+This problem can be forestalled with a
+.CW y
+command:
+.P1
+, y/\e\en/ x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/
+.P2
+(the second
+.CW \e
+is necessary because of lexical conventions in regular expressions),
+or we could even reject character constants and strings outright:
+.P1 0
+,y/'[^']*'/ y/"[^"]*"/ x/[A-Za-z_][A-Za-z_0-9]*/ g/n/ v/../ c/num/
+.P2
+The
+.CW y
+commands in this version exclude from consideration all character constants
+and strings.
+The only remaining problem is to deal with the possible occurrence of
+.CW \e'
+or
+.CW \e"
+within these sequences, but it's easy to see how to resolve this difficulty.
+.PP
+The point of these composed commands is successive refinement.
+A simple version of the command is tried, and if it's not good enough,
+it can be honed by adding a clause or two.
+(Mistakes can be undone; see below.
+Also, the mouse language makes it unnecessary to retype the command each time.)
+The resulting chains of commands are somewhat reminiscent of
+shell pipelines.\u\s-4\&7\s+4\d
+Unlike pipelines, though, which pass along modified
+.I data ,
+.CW sam
+commands pass a
+.I view
+of the data.
+The text at each step of the command is the same, but which pieces
+are selected is refined step by step until the correct piece is
+available to the final step of the command line, which ultimately makes the change.
+.PP
+In other UNIX programs, regular expressions are used only for selection,
+as in the
+.CW sam
+.CW g
+command, never for extraction as in the
+.CW x
+or
+.CW y
+command.
+For example, patterns in
+.CW awk \u\s-4\&7\s+4\d
+are used to select lines to be operated on, but cannot be used
+to describe the format of the input text, or to handle newline-free text.
+The use of regular expressions to describe the structure of a piece
+of text rather than its contents, as in the
+.CW x
+command, 
+has been given a name:
+.I
+structural regular expressions.
+.R
+When they are composed, as in the above example,
+they are pleasantly expressive.
+Their use is discussed at greater length elsewhere.\u\s-4\&10\s+4\d
+.PP
+.SH 2
+Multiple files
+.LP
+.CW Sam
+has a few other commands, mostly relating to input and output.
+.P1
+e discfilename
+.P2
+replaces the contents and name of the current file with those of the named
+disc file;
+.P1
+w discfilename
+.P2
+writes the contents to the named disc file; and
+.P1
+r discfilename
+.P2
+replaces dot with the contents of the named disc file.
+All these commands use the current file's name if none is specified.
+Finally,
+.P1
+f discfilename
+.P2
+changes the name associated with the file and displays the result:
+.P1
+\&'-. discfilename
+.P2
+This output is called the file's
+.I
+menu line,
+.R
+because it is the contents of the file's line in the button 3 menu (described
+in the
+next section).
+The first three characters are a concise notation for the state of the file.
+The apostrophe signifies that the file is modified.
+The minus sign indicates the number of windows
+open on the file (see the next section):
+.CW -
+means none,
+.CW +
+means one, and
+.CW *
+means more than one.
+Finally, the period indicates that this is the current file.
+These characters are useful for controlling the
+.CW X
+command, described shortly.
+.PP
+.CW Sam
+may be started with a set of disc files (such as all the source for
+a program) by invoking it with a list of file names as arguments, and
+more may be added or deleted on demand.
+.P1
+B discfile1 discfile2 ...
+.P2
+adds the named files to
+.CW sam 's
+list, and
+.P1
+D discfile1 discfile2 ...
+.P2
+removes them from
+.CW sam 's
+memory (without effect on associated disc files).
+Both these commands have a syntax for using the shell\u\s-4\&7\s+4\d
+(the UNIX command interpreter) to generate the lists:
+.P1
+B <echo *.c
+.P2
+will add all C source files, and
+.P1
+B <grep -l variable *.c
+.P2
+will add all C source files referencing a particular variable
+(the UNIX command
+.CW grep\ -l
+lists all files in its arguments that contain matches of
+the specified regular expression).
+Finally,
+.CW D
+without arguments deletes the current file.
+.PP
+There are two ways to change which file is current:
+.P1
+b filename
+.P2
+makes the named file current.
+The
+.CW B
+command
+does the same, but also adds any new files to
+.CW sam 's
+list.
+(In practice, of course, the current file
+is usually chosen by mouse actions, not by textual commands.)
+The other way is to use a form of address that refers to files:
+.P1
+"\f2expression\fP" \f2address\fP
+.P2
+refers to the address evaluated in the file whose menu line
+matches the expression (there must be exactly one match).
+For example,
+.P1
+"peter.c" 3
+.P2
+refers to the third line of the file whose name matches
+.CW peter.c .
+This is most useful in the move
+.CW m ) (
+and copy
+.CW t ) (
+commands:
+.P1
+0,$ t "peter.c" 0
+.P2
+makes a copy of the current file at the beginning of
+.CW peter.c .
+.PP
+The
+.CW X
+command
+is a looping construct, like
+.CW x ,
+that refers to files instead of strings:
+.P1
+X/\f2expression\fP/ \f2command\fP
+.P2
+runs the command in all
+files whose menu lines match the expression.  The best example is
+.P1
+X/'/ w
+.P2
+which writes to disc all modified files.
+.CW Y
+is the complement of
+.CW X :
+it runs the command on all files whose menu lines don't match the expression:
+.P1
+Y/\e.c/ D
+.P2
+deletes all files that don't have
+.CW \&.c
+in their names, that is, it keeps all C source files and deletes the rest.
+.PP
+Braces allow commands to be grouped, so
+.P1
+{
+	\f2command1\fP
+	\f2command2\fP
+}
+.P2
+is syntactically a single command that runs two commands.
+Thus,
+.P1
+X/\e.c/ ,g/variable/ {
+	f
+	, x/.*\en/ g/variable/ p
+}
+.P2
+finds all occurrences of
+.CW variable
+in C source files, and prints
+out the file names and lines of each match.
+The precise semantics of compound operations is discussed in the implementation
+sections below.
+.PP
+Finally,
+the undo command,
+.CW u ,
+undoes the last command,
+no matter how many files were affected.
+Multiple undo operations move further back in time, so
+.P1
+u
+u
+.P2
+(which may be abbreviated
+.CW u2 )
+undoes the last two commands.  An undo may not be undone, however, nor
+may any command that adds or deletes files.
+Everything else is undoable, though, including for example
+.CW e
+commands:
+.P1
+e filename
+u
+.P2
+restores the state of the file completely, including its name, dot,
+and modified bit.  Because of the undo, potentially dangerous commands
+are not guarded by confirmations.  Only
+.CW D ,
+which destroys the information necessary to restore itself, is protected.
+It will not delete a modified file, but a second
+.CW D
+of the same file will succeed regardless.
+The
+.CW q
+command, which exits
+.CW sam ,
+is similarly guarded.
+.SH 2
+Mouse Interface
+.LP
+.CW Sam
+is most commonly run
+connected to a bitmap display and mouse for interactive editing.
+The only difference in the command language
+between regular, mouse-driven
+.CW sam
+and
+.CW sam\ -d
+is that if an address
+is provided without a command,
+.CW sam\ -d
+will print the text referenced by the address, but
+regular
+.CW sam
+will highlight it on the screen \(em in fact,
+dot is always highlighted (see Figure 2).
+.WS 1
+.KF
+.XP fig3 2.04i
+.Cs
+Figure 2. A
+.CW sam
+window.  The scroll bar down the left
+represents the file, with the bubble showing the fraction
+visible in the window.
+The scroll bar may be manipulated by the mouse for convenient browsing.
+The current text,
+which is highlighted, need not fit on a line.  Here it consists of one partial
+line, one complete line, and final partial line.
+.Ce
+.KE
+.PP
+Each file may have zero or more windows open on the display.
+At any time, only one window in all of
+.CW sam
+is the
+.I
+current window,
+.R
+that is, the window to which typing and mouse actions refer;
+this may be the
+.CW sam
+window (that in which commands may be typed)
+or one of the file windows.
+When a file has multiple windows, the image of the file in each window
+is always kept up to date.
+The current file is the last file affected by a command,
+so if the
+.CW sam
+window is current,
+the current window is not a window on the current file.
+However, each window on a file has its own value of dot,
+and when switching between windows on a single file,
+the file's value of dot is changed to that of the window.
+Thus, flipping between windows behaves in the obvious, convenient way.
+.PP
+The mouse on the Blit has three buttons, numbered left to right.
+Button 3 has a list of commands to manipulate windows,
+followed by a list of `menu lines' exactly as printed by the
+.CW f
+command, one per file (not one per window).
+These menu lines are sorted by file name.
+If the list is long, the Blit menu software will make it more manageable
+by generating a scrolling menu instead of an unwieldy long list.
+Using the menu to select a file from the list makes that file the current
+file, and the most recently current window in that file the current window.
+But if that file is already current, selecting it in the menu cycles through
+the windows on the file; this simple trick avoids a special menu to
+choose windows on a file.
+If there is no window open on the file,
+.CW sam
+changes the mouse cursor to prompt the user to create one.
+.PP
+The commands on the button 3 menu are straightforward (see Figure 3), and
+are like the commands to manipulate windows in
+.CW mux ,\u\s-4\&8\s+4\d
+the Blit's window system.
+.CW New
+makes a new file, and gives it one empty window, whose size is determined
+by a rectangle swept by the mouse.
+.CW Zerox
+prompts for a window to be selected, and
+makes a clone of that window; this is how multiple windows are created on one file.
+.CW Reshape
+changes the size of the indicated window, and
+.CW close
+deletes it.  If that is the last window open on the file,
+.CW close
+first does a
+.CW D
+command on the file.
+.CW Write
+is identical to a
+.CW w
+command on the file; it is in the menu purely for convenience.
+Finally,
+.CW ~~sam~~
+is a menu item that appears between the commands and the file names.
+Selecting it makes the
+.CW sam
+window the current window,
+causing subsequent typing to be interpreted as commands.
+.KF
+.XP fig2 2.74i
+.Cs
+Figure 3. The menu on button 3.
+The black rectangle on the left is a scroll bar; the menu is limited to
+the length shown to prevent its becoming unwieldy.
+Above the
+.CW ~~sam~~
+line is a list of commands;
+beneath it is a list of files, presented exactly as with the
+.CW f
+command.
+.Ce
+.KE
+.PP
+When
+.CW sam
+requests that a window be swept, in response to
+.CW new ,
+.CW zerox
+or
+.CW reshape ,
+it changes the mouse cursor from the usual arrow to a box with
+a small arrow.
+In this state, the mouse may be used to indicate an arbitrary rectangle by
+pressing button 3 at one corner and releasing it at the opposite corner.
+More conveniently,
+button 3 may simply be clicked,
+whereupon
+.CW sam
+creates the maximal rectangle that contains the cursor
+and abuts the
+.CW sam
+window.
+By placing the
+.CW sam
+window in the middle of the screen, the user can define two regions (one above,
+one below) in which stacked fully-overlapping
+windows can be created with minimal fuss (see Figure 1).
+This simple user interface trick makes window creation noticeably easier.
+.PP
+The cut-and-paste editor is essentially the same as that in Smalltalk-80.\u\s-4\&11\s+4\d
+The text in dot is always highlighted on the screen.
+When a character is typed it replaces dot, and sets dot to the null
+string after the character.  Thus, ordinary typing inserts text.
+Button 1 is used for selection:
+pressing the button, moving the mouse, and lifting the button
+selects (sets dot to) the text between the points where the
+button was pressed and released.
+Pressing and releasing at the same point selects a null string; this
+is called clicking.  Clicking twice quickly, or
+.I
+double clicking,
+.R
+selects larger objects;
+for example, double clicking in a word selects the word,
+double clicking just inside an opening bracket selects the text
+contained in the brackets (handling nested brackets correctly),
+and similarly for
+parentheses, quotes, and so on.
+The double-clicking rules reflect a bias toward
+programmers.
+If
+.CW sam
+were intended more for word processing, double-clicks would probably
+select linguistic structures such as sentences.
+.PP
+If button 1 is pressed outside the current window, it makes the indicated
+window current.
+This is the easiest way to switch between windows and files.
+.PP
+Pressing button 2 brings up a menu of editing functions (see Figure 4).
+These mostly apply to the selected text:
+.CW cut
+deletes the selected text, and remembers it in a hidden buffer called the
+.I
+snarf buffer,
+.R
+.CW paste
+replaces the selected text by the contents of the snarf buffer,
+.CW snarf
+just copies the selected text to the snarf buffer,
+.CW look
+searches forward for the next literal occurrence of the selected text, and
+.CW <mux>
+exchanges snarf buffers with the window system in which
+.CW sam
+is running.
+Finally, the last regular expression used appears as a menu entry
+to search
+forward for the next occurrence of a match for the expression.
+.WS 1
+.KF
+.XP fig4 1.20i
+.Cs
+Figure 4. The menu on button 2.
+The bottom entry tracks the most recently used regular expression, which may
+be literal text.
+.Ce
+.KE
+.PP
+The relationship between the command language and the mouse language is
+entirely due to the equality of dot and the selected text chosen
+with button 1 on the mouse.
+For example, to make a set of changes in a C subroutine, dot can be
+set by double clicking on the left brace that begins the subroutine,
+which sets dot for the command language.
+An address-free command then typed in the
+.CW sam
+window will apply only to the text between the opening and closing
+braces of the function.
+The idea is to select what you want, and then say what you want
+to do with it, whether invoked by a menu selection or by a typed command.
+And of course, the value of dot is highlighted on
+the display after the command completes.
+This relationship between mouse interface and command language
+is clumsy to explain, but comfortable, even natural, in practice.
+.SH
+The Implementation
+.LP
+The next few sections describe how
+.CW sam
+is put together, first the host part,
+then the inter-component communication,
+then the terminal part.
+After explaining how the command language is implemented,
+the discussion follows (roughly) the path of a character
+from the temporary file on disc to the screen.
+The presentation centers on the data structures,
+because that is how the program was designed and because
+the algorithms are easy to provide, given the right data
+structures.
+.SH 2
+Parsing and execution
+.LP
+The command language is interpreted by parsing each command with a
+table-driven recursive
+descent parser, and when a complete command is assembled, invoking a top-down
+executor.
+Most editors instead employ a simple character-at-a-time
+lexical scanner.
+Use of a parser makes it
+easy and unambiguous to detect when a command is complete,
+which has two advantages.
+First, escape conventions such as backslashes to quote
+multiple-line commands are unnecessary;  if the command isn't finished,
+the parser keeps reading.  For example, a multiple-line append driven by an
+.CW x
+command is straightforward:
+.P1
+x/.*\en/ g/Peter/ a
+one line about Peter
+another line about Peter
+\&.
+.P2
+Other UNIX editors would require a backslash after all but the last line.
+.PP
+The other advantage is specific to the two-process structure of
+.CW sam .
+The host process must decide when a command is completed so the
+command interpreter can be called.  This problem is easily resolved
+by having the lexical analyzer read the single stream of events from the
+terminal, directly executing all typing and mouse commands,
+but passing to the parser characters typed to the
+.CW sam
+command window.
+This scheme is slightly complicated by the availability of cut-and-paste
+editing in the
+.CW sam
+window, but that difficulty is resolved by applying the rules
+used in
+.CW mux :
+when a newline is typed to the
+.CW sam
+window, all text between the newline and the previously typed newline
+is made available to the parser.
+This permits arbitrary editing to be done to a command before
+typing newline and thereby requesting execution.
+.PP
+The parser is driven by a table because the syntax of addresses
+and commands is regular enough
+to be encoded compactly.  There are few special cases, such as the
+replacement text in a substitution, so the syntax of almost all commands
+can be encoded with a few flags.
+These include whether the command allows an address (for example,
+.CW e
+does not), whether it takes a regular expression (as in
+.CW x
+and
+.CW s ),
+whether it takes replacement text (as in
+.CW c
+or
+.CW i ),
+which may be multi-line, and so on.
+The internal syntax of regular expressions is handled by a separate
+parser; a regular expression is a leaf of the command parse tree.
+Regular expressions are discussed fully in the next section.
+.PP
+The parser table also has information about defaults, so the interpreter
+is always called with a complete tree.  For example, the parser fills in
+the implicit
+.CW 0
+and
+.CW $
+in the abbreviated address
+.CW ,
+(comma),
+inserts a
+.CW +
+to the left of an unadorned regular expression in an address,
+and provides the usual default address
+.CW .
+(dot) for commands that expect an address but are not given one.
+.PP
+Once a complete command is parsed, the evaluation is easy.
+The address is evaluated left-to-right starting from the value of dot,
+with a mostly ordinary expression evaluator.
+Addresses, like many of the data structures in
+.CW sam ,
+are held in a C structure and passed around by value:
+.P1
+typedef long Posn;    /* Position in a file */
+typedef struct Range{
+        Posn    p1, p2;
+}Range;
+typedef struct Address{
+        Range   r;
+        File    *f;
+}Address;
+.P2
+An address is encoded as a substring (character positions
+.CW p1
+to
+.CW p2 )
+in a file
+.CW f .
+(The data type
+.CW File
+is described in detail below.)
+.PP
+The address interpreter is an
+.CW Address -valued
+function that traverses the parse tree describing an address (the
+parse tree for the address has type
+.CW Addrtree ):
+.P1
+Address
+address(ap, a, sign)
+	Addrtree *ap;
+	Address a;
+	int sign;
+{
+	Address a2;
+	do
+		switch(ap->type){
+		case '.':
+			a=a.f->dot;
+			break;
+		case '$':
+			a.r.p1=a.r.p2=a.f->nbytes;
+			break;
+		case '"':	
+			a=matchfile(a, ap->aregexp)->dot; 
+			break;
+		case ',':
+			a2=address(ap->right, a, 0);
+			a=address(ap->left, a, 0);
+			if(a.f!=a2.f || a2.r.p2<a.r.p1)
+				error(Eorder);
+			a.r.p2=a2.r.p2;
+			return a;
+		/* and so on */
+		}
+	while((ap=ap->right)!=0);
+	return a;
+}
+.P2
+.PP
+Throughout, errors are handled by a non-local
+.CW goto
+(a
+.CW setjmp/longjmp
+in C terminology)
+hidden in a routine called
+.CW error
+that immediately aborts the execution, retracts any
+partially made changes (see the section below on `undoing'), and
+returns to the top level of the parser.
+The argument to
+.CW error
+is an enumeration type that
+is translated to a terse but possibly helpful
+message such as `?addresses out of order.'
+Very common messages are kept short; for example the message for
+a failed regular expression search is `?search.'
+.PP
+Character addresses such as
+.CW #3
+are trivial to implement, as the
+.CW File
+data structure is accessible by character number.
+However,
+.CW sam
+keeps no information about the position of newlines \(em it is too
+expensive to track dynamically \(em so line addresses are computed by reading
+the file, counting newlines.  Except in very large files, this has proven
+acceptable: file access is fast enough to make the technique practical,
+and lines are not central to the structure of the command language.
+.PP
+The command interpreter, called
+.CW cmdexec ,
+is also straightforward.  The parse table includes a
+function to call to interpret a particular command.  That function
+receives as arguments
+the calculated address
+for the command
+and the command tree (of type
+.CW Cmdtree ),
+which may contain information such as the subtree for compound commands.
+Here, for example, is the function for the
+.CW g
+and
+.CW v
+commands:
+.P1
+int
+g_cmd(a, cp)
+	Address a;
+	Cmdtree *cp;
+{
+	compile(cp->regexp);
+	if(execute(a.f, a.r.p1, a.r.p2)!=(cp->cmdchar=='v')){
+		a.f->dot=a;
+		return cmdexec(a, cp->subcmd);
+	}
+	return TRUE;	/* cause execution to continue */
+}
+.P2
+.CW Compile "" (
+and
+.CW execute
+are part of the regular expression code, described in the next section.)
+Because the parser and the
+.CW File
+data structure do most of the work, most commands
+are similarly brief.
+.SH 2
+Regular expressions
+.LP
+The regular expression code in
+.CW sam
+is an interpreted, rather than compiled on-the-fly, implementation of Thompson's
+non-deterministic finite automaton algorithm.\u\s-4\&12\s+4\d
+The syntax and semantics of the expressions are as in the UNIX program
+.CW egrep ,
+including alternation, closures, character classes, and so on.
+The only changes in the notation are two additions:
+.CW \en
+is translated to, and matches, a newline character, and
+.CW @
+matches any character.  In
+.CW egrep ,
+the character
+.CW \&.
+matches any character except newline, and in
+.CW sam
+the same rule seemed safest, to prevent idioms like
+.CW \&.*
+from spanning newlines.
+.CW Egrep
+expressions are arguably too complicated for an interactive editor \(em
+certainly it would make sense if all the special characters were two-character
+sequences, so that most of the punctuation characters wouldn't have
+peculiar meanings \(em but for an interesting command language, full
+regular expressions are necessary, and
+.CW egrep
+defines the full regular expression syntax for UNIX programs.
+Also, it seemed superfluous to define a new syntax, since various UNIX programs
+.CW ed , (
+.CW egrep
+and
+.CW vi )
+define too many already.
+.PP
+The expressions are compiled by a routine,
+.CW compile ,
+that generates the description of the non-deterministic finite state machine.
+A second routine,
+.CW execute ,
+interprets the machine to generate the leftmost-longest match of the
+expression in a substring of the file.
+The algorithm is described elsewhere.\u\s-4\&12,13\s+4\d
+.CW Execute
+reports
+whether a match was found, and sets a global variable,
+of type
+.CW Range ,
+to the substring matched.
+.PP
+A trick is required to evaluate the expression in reverse, such as when
+searching backwards for an expression.
+For example,
+.P1
+-/P.*r/
+.P2
+looks backwards through the file for a match of the expression.
+The expression, however, is defined for a forward search.
+The solution is to construct a machine identical to the machine
+for a forward search except for a reversal of all the concatenation
+operators (the other operators are symmetric under direction reversal),
+to exchange the meaning of the operators
+.CW ^
+and
+.CW $ ,
+and then to read the file backwards, looking for the
+usual earliest longest match.
+.PP
+.CW Execute
+generates only one match each time it is called.
+To interpret looping constructs such as the
+.CW x
+command,
+.CW sam
+must therefore synchronize between
+calls of
+.CW execute
+to avoid
+problems with null matches.
+For example, even given the leftmost-longest rule,
+the expression
+.CW a*
+matches three times in the string
+.CW ab
+(the character
+.CW a ,
+the null string between the
+.CW a
+and
+.CW b ,
+and the final null string).
+After returning a match for the
+.CW a ,
+.CW sam
+must not match the null string before the
+.CW b .
+The algorithm starts
+.CW execute
+at the end of its previous match, and
+if the match it returns
+is null and abuts the previous match, rejects the match and advances
+the initial position one character.
+.SH 2
+Memory allocation
+.LP
+The C language has no memory allocation primitives, although a standard
+library routine,
+.CW malloc ,
+provides adequate service for simple programs.
+For specific uses, however,
+it can be better to write a custom allocator.
+The allocator (or rather, pair of allocators) described here
+work in both the terminal and host parts of
+.CW sam .
+They are designed for efficient manipulation of strings,
+which are allocated and freed frequently and vary in length from essentially
+zero to 32 Kbytes (very large strings are written to disc).
+More important, strings may be large and change size often,
+so to minimize memory usage it is helpful to reclaim and to coalesce the
+unused portions of strings when they are truncated.
+.PP
+Objects to be allocated in
+.CW sam
+are of two flavors:
+the first is C
+.CW structs ,
+which are small and often addressed by pointer variables;
+the second is variable-sized arrays of characters
+or integers whose
+base pointer is always used to access them.
+The memory allocator in
+.CW sam
+is therefore in two parts:
+first, a traditional first-fit allocator that provides fixed storage for
+.CW structs ;
+and second, a garbage-compacting allocator that reduces storage
+overhead for variable-sized objects, at the cost of some bookkeeping.
+The two types of objects are allocated from adjoining arenas, with
+the garbage-compacting allocator controlling the arena with higher addresses.
+Separating into two arenas simplifies compaction and prevents fragmentation due
+to immovable objects.
+The access rules for garbage-compactable objects
+(discussed in the next paragraph) allow them to be relocated, so when
+the first-fit arena needs space, it moves the garbage-compacted arena
+to higher addresses to make room.  Storage is therefore created only
+at successively higher addresses, either when more garbage-compacted
+space is needed or when the first-fit arena pushes up the other arena.
+.PP
+Objects that may be compacted declare to the
+allocator a cell that is guaranteed to be the sole repository of the
+address of the object whenever a compaction can occur.
+The compactor can then update the address when the object is moved.
+For example, the implementation of type
+.CW List
+(really a variable-length array)
+is:
+.P1
+typedef struct List{
+        int     nused;
+        long    *ptr;
+}List;
+.P2
+The
+.CW ptr
+cell must always be used directly, and never copied.  When a
+.CW List
+is to be created the
+.CW List
+structure is allocated in the ordinary first-fit arena
+and its
+.CW ptr
+is allocated in the garbage-compacted arena.
+A similar data type for strings, called
+.CW String ,
+stores variable-length character arrays of up to 32767 elements.
+.PP
+A related matter of programming style:
+.CW sam
+frequently passes structures by value, which
+simplifies the code.
+Traditionally, C programs have
+passed structures by reference, but implicit allocation on
+the stack is easier to use.
+Structure passing is a relatively new feature of C
+(it is not in the 
+standard reference manual for C\u\s-4\&14\s+4\d), and is poorly supported in most
+commercial C compilers.
+It's convenient and expressive, though,
+and simplifies memory management by
+avoiding the allocator altogether
+and eliminating pointer aliases.
+.SH 2
+Data structures for manipulating files
+.LP
+Experience with
+.CW jim
+showed that the requirements
+of the file data structure were few, but strict.
+First, files need to be read and written quickly;
+adding a fresh file must be painless.
+Second, the implementation must place no arbitrary upper limit on
+the number or sizes of files.  (It should be practical to edit many files,
+and files up to megabytes in length should be handled gracefully.)
+This implies that files be stored on disc, not in main memory.
+(Aficionados of virtual memory may argue otherwise, but the
+implementation of virtual
+memory in our system is not something to depend on
+for good performance.)
+Third, changes to files need be made by only two primitives:
+deletion and insertion.
+These are inverses of each other,
+which simplifies the implementation of the undo operation.
+Finally,
+it must be easy and efficient to access the file, either
+forwards or backwards, a byte at a time.
+.PP
+The
+.CW File
+data type is constructed from three simpler data structures that hold arrays
+of characters.
+Each of these types has an insertion and deletion operator, and the
+insertion and deletion operators of the
+.CW File
+type itself are constructed from them.
+.PP
+The simplest type is the
+.CW String ,
+which is used to hold strings in main memory.
+The code that manages
+.CW Strings
+guarantees that they will never be longer
+than some moderate size, and in practice they are rarely larger than 8 Kbytes.
+.CW Strings
+have two purposes: they hold short strings like file names with little overhead,
+and because they are deliberately small, they are efficient to modify.
+They are therefore used as the data structure for in-memory caches.
+.PP
+The disc copy of the file is managed by a data structure called a
+.CW Disc ,
+which corresponds to a temporary file.  A
+.CW Disc
+has no storage in main memory other than bookkeeping information;
+the actual data being held is all on the disc.
+To reduce the number of open files needed,
+.CW sam
+opens a dozen temporary UNIX files and multiplexes the
+.CW Discs
+upon them.
+This permits many files to
+be edited; the entire
+.CW sam
+source (48 files) may be edited comfortably with a single
+instance of
+.CW sam .
+Allocating one temporary file per
+.CW Disc
+would strain the operating system's limit on the number of open files.
+Also, spreading the traffic among temporary files keeps the files shorter,
+and shorter files are more efficiently implemented by the UNIX
+I/O subsystem.
+.PP
+A
+.CW Disc
+is an array of fixed-length blocks, each of which contains
+between 1 and 4096 characters of active data.
+(The block size of our UNIX file system is 4096 bytes.)
+The block addresses within the temporary file and the length of each
+block are stored in a
+.CW List .
+When changes are made the live part of blocks may change size.
+Blocks are created and coalesced when necessary to try to keep the sizes
+between 2048 and 4096 bytes.
+An actively changing part of the
+.CW Disc
+therefore typically has about a kilobyte of slop that can be
+inserted or deleted
+without changing more than one block or affecting the block order.
+When an insertion would overflow a block, the block is split, a new one
+is allocated to receive the overflow, and the memory-resident list of blocks
+is rearranged to reflect the insertion of the new block.
+.PP
+Obviously, going to the disc for every modification to the file is
+prohibitively expensive.
+The data type
+.CW Buffer
+consists of a
+.CW Disc
+to hold the data and a
+.CW String
+that acts as a cache.
+This is the first of a series of caches throughout the data structures in
+.CW sam.
+The caches not only improve performance, they provide a way to organize
+the flow of data, particularly in the communication between the host
+and terminal.
+This idea is developed below, in the section on communications.
+.PP
+To reduce disc traffic, changes to a
+.CW Buffer
+are mediated by a variable-length string, in memory, that acts as a cache.
+When an insertion or deletion is made to a
+.CW Buffer ,
+if the change can be accommodated by the cache, it is done there.
+If the cache becomes bigger than a block because of an insertion,
+some of it is written to the
+.CW Disc
+and deleted from the cache.
+If the change does not intersect the cache, the cache is flushed.
+The cache is only loaded at the new position if the change is smaller than a block;
+otherwise, it is sent directly to the
+.CW Disc .
+This is because
+large changes are typically sequential,
+whereupon the next change is unlikely to overlap the current one.
+.PP
+A
+.CW File
+comprises a
+.CW String
+to hold the file name and some ancillary data such as dot and the modified bit.
+The most important components, though, are a pair of
+.CW Buffers ,
+one called the transcript and the other the contents.
+Their use is described in the next section.
+.PP
+The overall structure is shown in Figure 5.
+Although it may seem that the data is touched many times on its
+way from the
+.CW Disc ,
+it is read (by one UNIX system call) directly into the cache of the
+associated
+.CW Buffer ;
+no extra copy is done.
+Similarly, when flushing the cache, the text is written
+directly from the cache to disc.
+Most operations act directly on the text in the cache.
+A principle applied throughout
+.CW sam
+is that the fewer times the data is copied, the faster the program will run
+(see also the paper by Waite\u\s-4\&15\s+4\d).
+.KF
+.PS
+copy "fig5.pic"
+.PE
+.Cs
+Figure 5. File data structures.
+The temporary files are stored in the standard repository for such files
+on the host system.
+.Ce
+.KE
+.PP
+The contents of a
+.CW File
+are accessed by a routine that
+copies to a buffer a substring of a file starting at a specified offset.
+To read a byte at a time, a
+.CW File "" per-
+array is loaded starting from a specified initial position,
+and bytes may then be read from the array.
+The implementation is done by a macro similar to the C standard I/O
+.CW getc
+macro.\u\s-4\&14\s+4\d
+Because the reading may be done at any address, a minor change to the
+macro allows the file to be read backwards.
+This array is read-only; there is no
+.CW putc .
+.SH 2
+Doing and undoing
+.LP
+.CW Sam
+has an unusual method for managing changes to files.
+The command language makes it easy to specify multiple variable-length changes
+to a file millions of bytes long, and such changes
+must be made efficiently if the editor is to be practical.
+The usual techniques for inserting and deleting strings
+are inadequate under these conditions.
+The
+.CW Buffer
+and
+.CW Disc
+data structures are designed for efficient random access to long strings,
+but care must be taken to avoid super-linear behavior when making
+many changes simultaneously.
+.PP
+.CW Sam
+uses a two-pass algorithm for making changes, and treats each file as a database
+against which transactions are registered.
+Changes are not made directly to the contents.
+Instead, when a command is started, a `mark' containing
+a sequence number is placed in the transcript
+.CW Buffer ,
+and each change made to the file, either an insertion or deletion
+or a change to the file name,
+is appended to the end of the transcript.
+When the command is complete, the transcript is rewound to the
+mark and applied to the contents.
+.PP
+One reason for separating evaluation from
+application in this way is to simplify tracking the addresses of changes
+made in the middle of a long sequence.
+The two-pass algorithm also allows all changes to apply to the
+.I original
+data: no change can affect another change made in the same command.
+This is particularly important when evaluating an
+.CW x
+command because it prevents regular expression matches
+from stumbling over changes made earlier in the execution.
+Also, the two-pass
+algorithm is cleaner than the way other UNIX editors allow changes to
+affect each other;
+for example,
+.CW ed 's
+idioms to do things like delete every other line
+depend critically on the implementation.
+Instead,
+.CW sam 's
+simple model, in which all changes in a command occur effectively
+simultaneously, is easy to explain and to understand.
+.PP
+The records in the transcript are of the form ``delete substring from
+locations
+123 to 456'' and ``insert 11 characters `hello there' at location 789.''
+(It is an error if the changes are not at monotonically greater
+positions through the file.)
+While the update is occurring, these numbers must be
+offset by earlier changes, but that is straightforward and
+local to the update routine;
+moreover, all the numbers have been computed
+before the first is examined.
+.PP
+Treating the file as a transaction system has another advantage:
+undo is trivial.
+All it takes is to invert the transcript after it has been
+implemented, converting insertions
+into deletions and vice versa, and saving them in a holding
+.CW Buffer .
+The `do' transcript can then be deleted from
+the transcript
+.CW Buffer
+and replaced by the `undo' transcript.
+If an undo is requested, the transcript is rewound and the undo transcript
+executed.
+Because the transcript
+.CW Buffer
+is not truncated after each command, it accumulates
+successive changes.
+A sequence of undo commands
+can therefore back up the file arbitrarily,
+which is more helpful than the more commonly implemented self-inverse form of undo.
+.CW Sam "" (
+provides no way to undo an undo, but if it were desired,
+it would be easy to provide by re-interpreting the `do' transcript.)
+Each mark in the transcript contains a sequence number and the offset into
+the transcript of the previous mark, to aid in unwinding the transcript.
+Marks also contain the value of dot and the modified bit so these can be
+restored easily.
+Undoing multiple files is easy; it merely demands undoing all files whose
+latest change has the same sequence number as the current file.
+.PP
+Another benefit of having a transcript is that errors encountered in the middle
+of a complicated command need not leave the files in an intermediate state.
+By rewinding the transcript to the mark beginning the command,
+the partial command can be trivially undone.
+.PP
+When the update algorithm was first implemented, it was unacceptably slow,
+so a cache was added to coalesce nearby changes,
+replacing multiple small changes by a single larger one.
+This reduced the number
+of insertions into the transaction
+.CW Buffer ,
+and made a dramatic improvement in performance,
+but made it impossible
+to handle changes in non-monotonic order in the file; the caching method
+only works if changes don't overlap.
+Before the cache was added, the transaction could in principle be sorted
+if the changes were out of order, although
+this was never done.
+The current status is therefore acceptable performance with a minor
+restriction on global changes, which is sometimes, but rarely, an annoyance.
+.PP
+The update algorithm obviously paws the data more than simpler
+algorithms, but it is not prohibitively expensive;
+the caches help.
+(The principle of avoiding copying the data is still honored here,
+although not as piously:
+the data is moved from contents' cache to
+the transcript's all at once and through only one internal buffer.)
+Performance figures confirm the efficiency.
+To read from a dead start a hundred kilobyte file on a VAX-11/750
+takes 1.4 seconds of user time, 2.5 seconds of system time,
+and 5 seconds of real time.
+Reading the same file in
+.CW ed
+takes 6.0 seconds of user time, 1.7 seconds of system time,
+and 8 seconds of real time.
+.CW Sam
+uses about half the CPU time.
+A more interesting example is the one stated above:
+inserting a character between every pair of characters in the file.
+The
+.CW sam
+command is
+.P1
+,y/@/ a/x/
+.P2
+and takes 3 CPU seconds per kilobyte of input file, of which
+about a third is spent in the regular expression code.
+This translates to about 500 changes per second.
+.CW Ed
+takes 1.5 seconds per kilobyte to make a similar change (ignoring newlines),
+but cannot undo it.
+The same example in
+.CW ex ,\u\s-4\&9\s+4\d
+a variant of
+.CW ed
+done at the University of California at Berkeley,
+which allows one level of undoing, again takes 3 seconds.
+In summary,
+.CW sam 's
+performance is comparable to that of other UNIX editors, although it solves
+a harder problem.
+.SH 2
+Communications
+.LP
+The discussion so far has described the implementation of the host part of
+.CW sam ;
+the next few sections explain how a machine with mouse and bitmap display
+can be engaged to improve interaction.
+.CW Sam
+is not the first editor to be written as two processes,\u\s-4\&16\s+4\d
+but its implementation
+has some unusual aspects.
+.PP
+There are several ways
+.CW sam 's
+host and terminal parts may be connected.
+The first and simplest is to forgo the terminal part and use the host
+part's command language to edit text on an ordinary terminal.
+This mode is invoked by starting
+.CW sam
+with the
+.CW -d
+option.
+With no options,
+.CW sam
+runs separate host and terminal programs,
+communicating with a message protocol over the physical
+connection that joins them.
+Typically, the connection is an RS-232 link between a Blit
+(the prototypical display for
+.CW sam )
+and a host running
+the Ninth Edition of the UNIX operating system.\u\s-4\&8\s+4\d
+(This is the version of the system used in the Computing Sciences Research
+Center at AT&T Bell Laboratories [now Lucent Technologies, Bell Labs], where I work.  Its relevant
+aspects are discussed in the Blit paper.\u\s-4\&1\s+4\d)
+The implementation of
+.CW sam
+for the SUN computer runs both processes on the same machine and
+connects them by a pipe.
+.PP
+The low bandwidth of an RS-232 link
+necessitated the split between
+the two programs.
+The division is a mixed blessing:
+a program in two parts is much harder to write and to debug
+than a self-contained one,
+but the split makes several unusual configurations possible.
+The terminal may be physically separated from the host, allowing the conveniences
+of a mouse and bitmap display to be taken home while leaving the files at work.
+It is also possible to run the host part on a remote machine:
+.P1
+sam -r host
+.P2
+connects to the terminal in the usual way, and then makes a call
+across the network to establish the host part of
+.CW sam
+on the named machine.
+Finally, it cross-connects the I/O to join the two parts.
+This allows
+.CW sam
+to be run on machines that do not support bitmap displays;
+for example,
+.CW sam
+is the editor of choice on our Cray X-MP/24.
+.CW Sam
+.CW -r
+involves
+.I three
+machines: the remote host, the terminal, and the local host.
+The local host's job is simple but vital: it passes the data
+between the remote host and terminal.
+.PP
+The host and terminal exchange messages asynchronously
+(rather than, say, as remote procedure calls) but there is no
+error detection or correction
+because, whatever the configuration, the connection is reliable.
+Because the terminal handles mundane interaction tasks such as
+popping up menus and interpreting the responses, the messages are about
+data, not actions.
+For example, the host knows nothing about what is displayed on the screen,
+and when the user types a character, the message sent to the host says
+``insert a one-byte string at location 123 in file 7,'' not ``a character
+was typed at the current position in the current file.''
+In other words, the messages look very much like the transaction records
+in the transcripts.
+.PP
+Either the host or terminal part of
+.CW sam
+may initiate a change to a file.
+The command language operates on the host, while typing and some
+mouse operations are executed directly in the terminal to optimize response.
+Changes initiated by the host program must be transmitted to the terminal,
+and
+vice versa.
+(A token is exchanged to determine which end is in control,
+which means that characters typed while a time-consuming command runs
+must be buffered and do not appear until the command is complete.)
+To maintain consistent information,
+the host and terminal track changes through a per-file
+data structure that records what portions of the file
+the terminal has received.
+The data structure, called a
+.CW Rasp
+(a weak pun: it's a file with holes)
+is held and updated by both the host and terminal.
+A
+.CW Rasp
+is a list of
+.CW Strings
+holding those parts of the file known to the terminal,
+separated by counts of the number of bytes in the interstices.
+Of course, the host doesn't keep a separate copy of the data (it only needs
+the lengths of the various pieces),
+but the structure is the same on both ends.
+.PP
+The
+.CW Rasp
+in the terminal doubles as a cache.
+Since the terminal keeps the text for portions of the file it has displayed,
+it need not request data from the host when revisiting old parts of the file
+or redrawing obscured windows, which speeds things up considerably
+over low-speed links.
+.PP
+It's trivial for the terminal to maintain its
+.CW Rasp ,
+because all changes made on the terminal apply to parts of the file
+already loaded there.
+Changes made by the host are compared against the
+.CW Rasp
+during the update sequence after each command.
+Small changes to pieces of the file loaded in the terminal
+are sent in their entirety.
+Larger changes, and changes that fall entirely in the holes,
+are transmitted as messages without literal data:
+only the lengths of the deleted and inserted strings are transmitted.
+When a command is completed, the terminal examines its visible
+windows to see if any holes in their
+.CW Rasps
+intersect the visible portion of the file.
+It then requests the missing data from the host,
+along with up to 512 bytes of surrounding data, to minimize
+the number of messages when visiting a new portion of the file.
+This technique provides a kind of two-level lazy evaluation for the terminal.
+The first level sends a minimum of information about
+parts of the file not being edited interactively;
+the second level waits until a change is displayed before
+transmitting the new data.
+Of course,
+performance is also helped by having the terminal respond immediately to typing
+and simple mouse requests.
+Except for small changes to active pieces of the file, which are
+transmitted to the terminal without negotiation,
+the terminal is wholly responsible for deciding what is displayed;
+the host uses the
+.CW Rasp
+only to tell the terminal what might be relevant.
+.PP
+When a change is initiated by the host,
+the messages to the terminal describing the change
+are generated by the routine that applies the transcript of the changes
+to the contents of the
+.CW File .
+Since changes are undone by the same update routine,
+undoing requires
+no extra code in the communications;
+the usual messages describing changes to the file are sufficient
+to back up the screen image.
+.PP
+The
+.CW Rasp
+is a particularly good example of the way caches are used in
+.CW sam .
+First, it facilitates access to the active portion of the text by placing
+the busy text in main memory.
+In so doing, it provides efficient access
+to a large data structure that does not fit in memory.
+Since the form of data is to be imposed by the user, not by the program,
+and because characters will frequently be scanned sequentially,
+files are stored as flat objects.
+Caches help keep performance good and linear when working with such
+data.
+.PP
+Second, the
+.CW Rasp
+and several of the other caches have some
+.I read-ahead;
+that is, the cache is loaded with more information than is needed for
+the job immediately at hand.
+When manipulating linear structures, the accesses are usually sequential,
+and read-ahead can significantly reduce the average time to access the
+next element of the object.
+Sequential access is a common mode for people as well as programs;
+consider scrolling through a document while looking for something.
+.PP
+Finally, like any good data structure,
+the cache guides the algorithm, or at least the implementation.
+The
+.CW Rasp
+was actually invented to control the communications between the host and
+terminal parts, but I realized very early that it was also a form of
+cache.  Other caches were more explicitly intended to serve a double
+purpose: for example, the caches in
+.CW Files
+that coalesce updates not only reduce traffic to the
+transcript and contents
+.CW Buffers ,
+they also clump screen updates so that complicated changes to the
+screen are achieved in
+just a few messages to the terminal.
+This saved me considerable work: I did not need to write special
+code to optimize the message traffic to the
+terminal.
+Caches pay off in surprising ways.
+Also, they tend to be independent, so their performance improvements
+are multiplicative.
+.SH 2
+Data structures in the terminal
+.LP
+The terminal's job is to display and to maintain a consistent image of
+pieces of the files being edited.
+Because the text is always in memory, the data structures are
+considerably simpler than those in the host part.
+.PP
+.CW Sam
+typically has far more windows than does
+.CW mux ,
+the window system within which its Blit implementation runs.
+.CW Mux
+has a fairly small number of asynchronously updated windows;
+.CW sam
+needs a large number of synchronously updated windows that are
+usually static and often fully obscured.
+The different tradeoffs guided
+.CW sam
+away from the memory-intensive implementation of windows, called
+.CW Layers ,\u\s-4\&17\s+4\d
+used in
+.CW mux.
+Rather than depending on a complete bitmap image of the display for each window,
+.CW sam
+regenerates the image from its in-memory text
+(stored in the
+.CW Rasp )
+when necessary, although it will use such an image if it is available.
+Like
+.CW Layers ,
+though,
+.CW sam
+uses the screen bitmap as active storage in which to update the image using
+.CW bitblt .\u\s-4\&18,19\s+4\d
+The resulting organization, pictured in Figure 6,
+has a global array of windows, called
+.CW Flayers ,
+each of which holds an image of a piece of text held in a data structure
+called a
+.CW Frame ,
+which in turn represents
+a rectangular window full of text displayed in some
+.CW Bitmap .
+Each
+.CW Flayer
+appears in a global list that orders them all front-to-back
+on the display, and simultaneously as an element of a per-file array
+that holds all the open windows for that file.
+The complement in the terminal of the
+.CW File
+on the host is called a
+.CW Text ;
+each connects its
+.CW Flayers
+to the associated
+.CW Rasp .
+.KF
+.PS
+copy "fig6.pic"
+.PE
+.Cs
+Figure 6. Data structures in the terminal.
+.CW Flayers
+are also linked together into a front-to-back list.
+.CW Boxes
+are discussed in the next section.
+.Ce
+.KE
+.PP
+The
+.CW Bitmap
+for a
+.CW Frame
+contains the image of the text.
+For a fully visible window, the
+.CW Bitmap
+will be the screen (or at least the
+.CW Layer
+in which
+.CW sam
+is being run),
+while for partially obscured windows the
+.CW Bitmap
+will be off-screen.
+If the window is fully obscured, the
+.CW Bitmap
+will be null.
+.PP
+The
+.CW Bitmap
+is a kind of cache.
+When making changes to the display, most of the original image will
+look the same in the final image, and the update algorithms exploit this.
+The
+.CW Frame
+software updates the image in the
+.CW Bitmap
+incrementally; the
+.CW Bitmap
+is not just an image, it is a data structure.\u\s-4\&18,19\s+4\d
+The job of the software that updates the display is therefore
+to use as much as possible of the existing image (converting the
+text from ASCII characters to pixels is expensive) in a sort of two-dimensional
+string insertion algorithm.
+The details of this process are described in the next section.
+.PP
+The
+.CW Frame
+software has no code to support overlapping windows;
+its job is to keep a single
+.CW Bitmap
+up to date.
+It falls to the
+.CW Flayer
+software to multiplex the various
+.CW Bitmaps
+onto the screen.
+The problem of maintaining overlapping
+.CW Flayers
+is easier than for
+.CW Layers \u\s-4\&17\s+4\d
+because changes are made synchronously and because the contents of the window
+can be reconstructed from the data stored in the
+.CW Frame ;
+the
+.CW Layers
+software
+makes no such assumptions.
+In
+.CW sam ,
+the window being changed is almost always fully visible, because the current
+window is always fully visible, by construction.
+However, when multi-file changes are being made, or when
+more than one window is open on a file,
+it may be necessary to update partially obscured windows.
+.PP
+There are three cases: the window is 
+fully visible, invisible (fully obscured), or partially visible.
+If fully visible, the
+.CW Bitmap
+is part of the screen, so when the
+.CW Flayer
+update routine calls the
+.CW Frame
+update routine, the screen will be updated directly.
+If the window is invisible,
+there is no associated
+.CW Bitmap ,
+and all that is necessary is to update the
+.CW Frame
+data structure, not the image.
+If the window is partially visible, the
+.CW Frame
+routine is called to update the image in the off-screen
+.CW Bitmap ,
+which may require regenerating it from the text of the window.
+The
+.CW Flayer
+code then clips this
+.CW Bitmap
+against the
+.CW Bitmaps
+of all
+.CW Frames
+in front of the
+.CW Frame
+being modified, and the remainder is copied to the display.
+.PP
+This is much faster than recreating the image off-screen
+for every change, or clipping all the changes made to the image
+during its update.
+Unfortunately, these caches can also consume prohibitive amounts of
+memory, so they are freed fairly liberally \(em after every change to the
+front-to-back order of the
+.CW Flayers .
+The result is that
+the off-screen
+.CW Bitmaps
+exist only while multi-window changes are occurring,
+which is the only time the performance improvement they provide is needed.
+Also, the user interface causes fully-obscured windows to be the
+easiest to make \(em
+creating a canonically sized and placed window requires only a button click
+\(em which reduces the need for caching still further.
+.PP
+.SH 2
+Screen update
+.LP
+Only two low-level primitives are needed for incremental update:
+.CW bitblt ,
+which copies rectangles of pixels, and
+.CW string
+(which in turn calls
+.CW bitblt ),
+which draws a null-terminated character string in a
+.CW Bitmap .
+A
+.CW Frame
+contains a list of
+.CW Boxes ,
+each of which defines a horizontal strip of text in the window
+(see Figure 7).
+A
+.CW Box
+has a character string
+.CW str ,
+and a
+.CW Rectangle
+.CW rect
+that defines the location of the strip in the window.
+(The text in
+.CW str
+is stored in the
+.CW Box
+separately from the
+.CW Rasp
+associated with the window's file, so
+.CW Boxes
+are self-contained.)
+The invariant is that
+the image of the
+.CW Box
+can be reproduced by calling
+.CW string
+with argument
+.CW str
+to draw the string in
+.CW rect ,
+and the resulting picture fits perfectly within
+.CW rect .
+In other words, the
+.CW Boxes
+define the tiling of the window.
+The tiling may be complicated by long lines of text, which
+are folded onto the next line.
+Some editors use horizontal scrolling to avoid this complication,
+but to be comfortable this technique requires that lines not be
+.I too
+long;
+.CW sam
+has no such restriction.
+Also, and perhaps more importantly, UNIX programs and terminals traditionally fold
+long lines to make their contents fully visible.
+.PP
+Two special kinds of
+.CW Boxes
+contain a single
+character: either a newline or a tab.
+Newlines and tabs are white space.
+A newline
+.CW Box
+always extends to the right edge of the window,
+forcing the following
+.CW Box
+to the next line.
+The width of a tab depends on where it is located:
+it forces the next
+.CW Box
+to begin at a tab location.
+Tabs also
+have a minimum width equivalent to a blank (blanks are
+drawn by
+.CW string
+and are not treated specially); newlines have a minimum width of zero.
+.KF
+.PS
+copy "fig7.pic"
+.PE
+.sp .5
+.Cs
+Figure 7. A line of text showing its
+.CW Boxes .
+The first two blank
+.CW Boxes
+contain tabs; the last contains a newline.
+Spaces are handled as ordinary characters.
+.Ce
+.KE
+.PP
+The update algorithms always use the
+.CW Bitmap
+image of the text (either the display or cache
+.CW Bitmap );
+they never examine the characters within a
+.CW Box
+except when the
+.CW Box
+needs to be split in two.
+Before a change, the window consists of a tiling of
+.CW Boxes ;
+after the change the window is tiled differently.
+The update algorithms rearrange the tiles in place, without
+backup storage.
+The algorithms are not strictly optimal \(em for example, they can
+clear a pixel that is later going to be written upon \(em
+but they never move a tile that doesn't need to be moved,
+and they move each tile at most once.
+.CW Frinsert
+on a Blit can absorb over a thousand characters a second if the strings
+being inserted are a few tens of characters long.
+.PP
+Consider
+.CW frdelete .
+Its job is to delete a substring from a
+.CW Frame
+and restore the image of the
+.CW Frame .
+The image of a substring has a peculiar shape (see Figure 2) comprising
+possibly a partial line,
+zero or more full lines,
+and possibly a final partial line.
+For reference, call this the
+.I
+Z-shape.
+.R
+.CW Frdelete
+begins by splitting, if necessary, the
+.CW Boxes
+containing the ends of
+the substring so the substring begins and ends on
+.CW Box
+boundaries.
+Because the substring is being deleted, its image is not needed,
+so the Z-shape is then cleared.
+Then, tiles (that is, the images of
+.CW Boxes )
+are copied, using
+.CW bitblt ,
+from immediately after the Z-shape to
+the beginning of the Z-shape,
+resulting in a new Z-shape.
+.CW Boxes "" (
+whose contents would span two lines in the new position must first be split.)
+.PP
+Copying the remainder of the
+.CW Frame
+tile by tile
+this way will clearly accomplish the deletion but eventually,
+typically when the copying algorithm encounters a tab or newline,
+the old and new
+.CW x
+coordinates of the tile
+to be copied are the same.
+This correspondence implies
+that the Z-shape has its beginning and ending edges aligned
+vertically, and a sequence of at most two
+.CW bitblts
+can be used to copy the remaining tiles.
+The last step is to clear out the resulting empty space at the bottom
+of the window;
+the number of lines to be cleared is the number of complete lines in the
+Z-shape closed by the final
+.CW bitblts.
+The final step is to merge horizontally adjacent
+.CW Boxes
+of plain text.
+The complete source to
+.CW frdelete
+is less than 100 lines of C.
+.PP
+.CW frinsert
+is more complicated because it must do four passes:
+one to construct the
+.CW Box
+list for the inserted string,
+one to reconnoitre,
+one to copy (in opposite order to
+.CW frdelete )
+the
+.CW Boxes
+to make the hole for the new text,
+and finally one to copy the new text into place.
+Overall, though,
+.CW frinsert
+has a similar flavor to
+.CW frdelete ,
+and needn't be described further.
+.CW Frinsert
+and its subsidiary routines comprise 211 lines of C.
+.PP
+The terminal source code is 3024 lines of C,
+and the host source is 5797 lines.
+.SH
+Discussion
+.SH 2
+History
+.LP
+The immediate ancestor of
+.CW sam
+was the original text editor for the Blit, called
+.CW jim .
+.CW Sam
+inherited
+.CW jim 's
+two-process structure and mouse language almost unchanged, but
+.CW jim
+suffered from several drawbacks that were addressed in the design of
+.CW sam .
+The most important of these was the lack of a command language.
+Although
+.CW jim
+was easy to use for simple editing, it provided no direct help with
+large or repetitive editing tasks.  Instead, it provided a command to pass
+selected text through a shell pipeline,
+but this was no more satisfactory than could be expected of a stopgap measure.
+.PP
+.CW Jim
+was written primarily as a vehicle for experimenting with a mouse-based
+interface to text, and the experiment was successful.
+.CW Jim
+had some spin-offs:
+.CW mux ,
+the second window system for the Blit, is essentially a multiplexed
+version of the terminal part of
+.CW jim ;
+and the debugger
+.CW pi 's
+user interface\u\s-4\&20\s+4\d was closely modeled on
+.CW jim 's.
+But after a couple of years,
+.CW jim
+had become difficult to maintain and limiting to use,
+and its replacement was overdue.
+.PP
+I began the design of
+.CW sam
+by asking
+.CW jim
+customers what they wanted.
+This was probably a mistake; the answers were essentially a list of features
+to be found in other editors, which did not provide any of the
+guiding principles I was seeking.
+For instance, one common request was for a ``global substitute,''
+but no one suggested how to provide it within a cut-and-paste editor.
+I was looking for a scheme that would
+support such specialized features comfortably in the context of some
+general command language.
+Ideas were not forthcoming, though, particularly given my insistence
+on removing all limits on file sizes, line lengths and so on.
+Even worse, I recognized that, since the mouse could easily
+indicate a region of the screen that was not an integral number of lines,
+the command language would best forget about newlines altogether,
+and that meant the command language had to treat the file as a single
+string, not an array of lines.
+.PP
+Eventually, I decided that thinking was not getting me very far and it was
+time to try building.
+I knew that the terminal part could be built easily \(em
+that part of
+.CW jim
+behaved acceptably well \(em and that most of the hard work was going
+to be in the host part: the file interface, command interpreter and so on.
+Moreover, I had some ideas about how the architecture of
+.CW jim
+could be improved without destroying its basic structure, which I liked
+in principle but which hadn't worked out as well as I had hoped.
+So I began by designing the file data structure,
+starting with the way
+.CW jim
+worked \(em comparable to a single structure merging
+.CW Disc
+and
+.CW Buffer ,
+which I split to make the cache more general
+\(em and thinking about how global substitute could be implemented.
+The answer was clearly that it had to be done in two passes,
+and the transcript-oriented implementation fell out naturally.
+.PP
+.CW Sam
+was written bottom-up,
+starting from the data structures and algorithms for manipulating text,
+through the command language and up to the code for maintaining
+the display.
+In retrospect, it turned out well, but this implementation method is
+not recommended in general.
+There were several times when I had a large body of interesting code
+assembled and no clue how to proceed with it.
+The command language, in particular, took almost a year to figure out,
+but can be implemented (given what was there at the beginning of that year)
+in a day or two.  Similarly, inventing the
+.CW Rasp
+data structure delayed the
+connection of the host and terminal pieces by another few months.
+.CW Sam
+took about two years to write, although only about four months were
+spent actually working on it.
+.PP
+Part of the design process was unusual:
+the subset of the protocol that maintains the
+.CW Rasp
+was simulated, debugged
+and verified by an automatic protocol analyzer,\u\s-4\&21\s+4\d and was bug-free
+from the start.
+The rest of the protocol, concerned mostly
+with keeping menus up to date,
+was unfortunately too unwieldy for such analysis,
+and was debugged by more traditional methods, primarily
+by logging in a file all messages in and out of the host.
+.SH 2
+Reflections
+.LP
+.CW Sam
+is essentially the only interactive editor used by the sixty or so members of
+the computing science research center in which I work.
+The same could not be said of
+.CW jim ;
+the lack of a command language kept some people from adopting it.
+The union of a user interface as comfortable as
+.CW jim 's
+with a command language as powerful as
+.CW ed 's†
+.FS
+.vs 9
+†The people who criticize
+.CW ed
+as an interactive program often forget that it and its close relative
+.CW sed \u\s-4\&7\s+4\d
+still thrive as programmable editors.  The strength of these programs is
+independent of their convenience for interactive editing.
+.br
+.vs
+.FE
+is essential to
+.CW sam 's
+success.
+When
+.CW sam
+was first made available to the
+.CW jim
+community,
+almost everyone switched to it within two or three days.
+In the months that followed, even people who had never adopted
+.CW jim
+started using
+.CW sam
+exclusively.
+.PP
+To be honest,
+.CW ed
+still gets occasional use, but usually when
+something quick needs to be done and the overhead of
+downloading the terminal part of
+.CW sam
+isn't worth the trouble.
+Also, as a `line' editor,
+.CW sam
+.CW -d
+is a bit odd;
+when using a good old ASCII terminal, it's comforting to have
+a true line editor.
+But it is fair to say that
+.CW sam 's
+command language has displaced
+.CW ed 's
+for most of the complicated editing that has kept line editors
+(that is, command-driven editors) with us.
+.PP
+.CW Sam 's
+command language is even fancier than
+.CW ed 's,
+and most
+.CW sam
+customers don't come near to using all its capabilities.
+Does it need to be so sophisticated?
+I think the answer is yes, for two reasons.
+.PP
+First, the
+.I model
+for
+.CW sam 's
+command language is really relatively simple, and certainly simpler than that of
+.CW ed .
+For instance, there is only one kind of textual loop in
+.CW sam
+\(em the
+.CW x
+command \(em
+while
+.CW ed
+has three (the
+.CW g
+command, the global flag on substitutions, and the implicit loop over
+lines in multi-line substitutions).
+Also,
+.CW ed 's
+substitute command is necessary to make changes within lines, but in
+.CW sam
+the
+.CW s
+command is more of a familiar convenience than a necessity;
+.CW c
+and
+.CW t
+can do all the work.
+.PP
+Second,
+given a community that expects an editor to be about as powerful as
+.CW ed ,
+it's hard to see how
+.CW sam
+could really be much simpler and still satisfy that expectation.
+People want to do ``global substitutes,'' and most are content
+to have the recipe for that and a few other fancy changes.
+The sophistication of the command language is really just a veneer
+over a design that makes it possible to do global substitutes
+in a screen editor.
+Some people will always want something more, however, and it's gratifying to
+be able to provide it.
+The real power of
+.CW sam 's
+command language comes from composability of the operators, which is by
+nature orthogonal to the underlying model.
+In other words,
+.CW sam
+is not itself complex, but it makes complex things possible.
+If you don't want to do anything complex, you can ignore the
+complexity altogether, and many people do so.
+.PP
+Sometimes I am asked the opposite question: why didn't I just make
+.CW sam
+a real programmable editor, with macros and variables and so on?
+The main reason is a matter of taste: I like the editor
+to be the same every time I use it.
+There is one technical reason, though:
+programmability in editors is largely a workaround for insufficient
+interactivity.
+Programmable editors are used to make particular, usually short-term,
+things easy to do, such as by providing shorthands for common actions.
+If things are generally easy to do in the first place,
+shorthands are not as helpful.
+.CW Sam
+makes common editing operations very easy, and the solutions to
+complex editing problems seem commensurate with the problems themselves.
+Also, the ability to edit the
+.CW sam
+window makes it easy to repeat commands \(em it only takes a mouse button click
+to execute a command again.
+.SH 2
+Pros and cons
+.LP
+.CW Sam
+has several other good points,
+and its share of problems.
+Among the good things is the idea of
+structural regular expressions,
+whose usefulness has only begun to be explored.
+They were arrived at serendipitously when I attempted to distill the essence of
+.CW ed 's
+way of doing global substitution and recognized that the looping command in
+.CW ed
+was implicitly imposing a structure (an array of lines) on the file.
+.PP
+Another of
+.CW sam 's
+good things is its undo capability.
+I had never before used an editor with a true undo,
+but I would never go back now.
+Undo
+.I must
+be done well, but if it is, it can be relied on.
+For example,
+it's safe to experiment if you're not sure how to write some intricate command,
+because if you make a mistake, it can be fixed simply and reliably.
+I learned two things about undo from writing
+.CW sam :
+first, it's easy to provide if you design it in from the beginning, and
+second, it's necessary, particularly if the system has some subtle
+properties that may be unfamiliar or error-prone for users.
+.PP
+.CW Sam 's
+lack of internal limits and sizes is a virtue.
+Because it avoids all fixed-size tables and data structures,
+.CW sam
+is able to make global changes to files that some of our other
+tools cannot even read.
+Moreover, the design keeps the performance linear when doing such
+operations, although I must admit
+.CW sam
+does get slow when editing a huge file.
+.PP
+Now, the problems.
+Externally, the most obvious is that it is poorly integrated into the
+surrounding window system.
+By design, the user interface in
+.CW sam
+feels almost identical to that of
+.CW mux ,
+but a thick wall separates text in
+.CW sam
+from the programs running in
+.CW mux .
+For instance, the `snarf buffer' in
+.CW sam
+must be maintained separately from that in
+.CW mux .
+This is regrettable, but probably necessary given the unusual configuration
+of the system, with a programmable terminal on the far end of an RS-232 link.
+.PP
+.CW Sam
+is reliable; otherwise, people wouldn't use it.
+But it was written over such a long time, and has so many new (to me)
+ideas in it, that I would like to see it done over again to clean
+up the code and remove many of the lingering problems in the implementation.
+The worst part is in the interconnection of the host and terminal parts,
+which might even be able to go away in a redesign for a more
+conventional window system.
+The program must be split in two to use the terminal effectively,
+but the low bandwidth of the connection forces the separation to
+occur in an inconvenient part of the design if performance is to be acceptable.
+A simple remote procedure call
+protocol driven by the host, emitting only graphics
+commands, would be easy to write but wouldn't have nearly the
+necessary responsiveness.  On the other hand, if the terminal were in control
+and requested much simpler file services from the host, regular expression
+searches would require that the terminal read the entire file over its RS-232
+link, which would be unreasonably slow.
+A compromise in which either end can take control is necessary.
+In retrospect, the communications protocol should have been
+designed and verified formally, although I do not know of any tool
+that can adequately relate the protocol to
+its implementation.
+.PP
+Not all of
+.CW sam 's
+users are comfortable with its command language, and few are adept.
+Some (venerable) people use a sort of
+.CW ed \& ``
+subset'' of
+.CW sam 's
+command language,
+and even ask why
+.CW sam 's
+command language is not exactly
+.CW ed 's.
+(The reason, of course, is that
+.CW sam 's
+model for text does not include newlines, which are central to
+.CW ed .
+Making the text an array of newlines to the command language would
+be too much of a break from the seamless model provided by the mouse.
+Some editors, such as
+.CW vi ,
+are willing to make this break, though.)
+The difficulty is that
+.CW sam 's
+syntax is so close to
+.CW ed 's
+that people believe it
+.I should
+be the same.
+I thought, with some justification in hindsight,
+that making
+.CW sam
+similar to
+.CW ed
+would make it easier to learn and to accept.
+But I may have overstepped and raised the users'
+expectations too much.
+It's hard to decide which way to resolve this problem.
+.PP
+Finally, there is a tradeoff in
+.CW sam
+that was decided by the environment in which it runs:
+.CW sam
+is a multi-file editor, although in a different system there might instead be
+multiple single-file editors.
+The decision was made primarily because starting a new program in a Blit is
+time-consuming.
+If the choice could be made freely, however, I would
+still choose the multi-file architecture, because it allows
+groups of files to be handled as a unit;
+the usefulness of the multi-file commands is incontrovertible.
+It is delightful to have the source to an entire program
+available at your fingertips.
+.SH
+Acknowledgements
+.LP
+Tom Cargill suggested the idea behind the
+.CW Rasp
+data structure.
+Norman Wilson and Ken Thompson influenced the command language.
+This paper was improved by comments from
+Al Aho,
+Jon Bentley,
+Chris Fraser,
+Gerard Holzmann,
+Brian Kernighan,
+Ted Kowalski,
+Doug McIlroy
+and
+Dennis Ritchie.
diff --git a/sys/doc/sam/sam.pdf b/sys/doc/sam/sam.pdf
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+cleartomark
+%%EndResource
+%%BeginResource: font lsunr03
+%!PS-AdobeFont-1.1: LucidaSansUnicode03 0.9
+%%CreationDate: 1994 Jun 04 09:58:17
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (0.9) readonly def
+/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
+/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
+/FullName (Lucida Sans Unicode 03) readonly def
+/FamilyName (LucidaSansUnicode) readonly def
+/Weight (Normal) readonly def
+/ItalicAngle 0 def
+/isFixedPitch false def
+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
+/FontName /LucidaSansUnicode03 def
+/PaintType 0 def
+/FontType 1 def
+/FontMatrix [0.001 0 0 0.001 0 0] readonly def
+/Encoding 256 array
+0 1 255 {1 index exch /.notdef put} for
+dup 148 /0394 put
+dup 154 /039a put
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+dup 173 /03ad put
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+readonly def
+/FontBBox{-615 -440 726 1024}readonly def
+%/UniqueID 5054503 def
+currentdict end
+currentfile eexec
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+cleartomark
+%%EndResource
+%%BeginResource: font lsunr04
+%!PS-AdobeFont-1.1: LucidaSansUnicode04 0.9
+%%CreationDate: 1994 Jun 04 09:58:28
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (0.9) readonly def
+/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
+/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
+/FullName (Lucida Sans Unicode 04) readonly def
+/FamilyName (LucidaSansUnicode) readonly def
+/Weight (Normal) readonly def
+/ItalicAngle 0 def
+/isFixedPitch false def
+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
+/FontName /LucidaSansUnicode04 def
+/PaintType 0 def
+/FontType 1 def
+/FontMatrix [0.001 0 0 0.001 0 0] readonly def
+/Encoding 256 array
+0 1 255 {1 index exch /.notdef put} for
+dup 57 /0439 put
+dup 74 /044a put
+dup 76 /044c put
+dup 79 /044f put
+dup 81 /0451 put
+readonly def
+/FontBBox{-90 -211 1024 940}readonly def
+%/UniqueID 5054504 def
+currentdict end
+currentfile eexec
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+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
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+%!PS-AdobeFont-1.1: LucidaSansUnicode21 0.9
+%%CreationDate: 1994 Jun 04 10:04:24
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (0.9) readonly def
+/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
+/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
+/FullName (Lucida Sans Unicode 21) readonly def
+/FamilyName (LucidaSansUnicode) readonly def
+/Weight (Normal) readonly def
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+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
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+dup 145 /2191 put
+dup 146 /2192 put
+dup 147 /2193 put
+dup 34 /2122 put
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+readonly def
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+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
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+%%BeginResource: font lsunr25
+%!PS-AdobeFont-1.1: LucidaSansUnicode25 0.9
+%%CreationDate: 1994 Jun 04 10:42:59
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
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+/version (0.9) readonly def
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+/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
+/FullName (Lucida Sans Unicode 25) readonly def
+/FamilyName (LucidaSansUnicode) readonly def
+/Weight (Normal) readonly def
+/ItalicAngle 0 def
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+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
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+readonly def
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+%%EndResource
+%%BeginResource: font lsi
+%!PS-AdobeFont-1.1: LucidaSans-Italic 1.001
+%%CreationDate: 1993 Aug 11 21:10:09
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (1.001) readonly def
+/Notice ((c) 1992 Bigelow & Holmes Inc. Pat. Des. 289,421. All rights reserved.) readonly def
+/Notice ((c) 1992 by Y&Y Inc. All Rights Reserved.) readonly def
+/FullName (Lucida Sans Italic) readonly def
+/FamilyName (LucidaSans) readonly def
+/Weight (Normal) readonly def
+/ItalicAngle -11.3 def
+/isFixedPitch false def
+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
+/FontName /LucidaSans-Italic def
+/PaintType 0 def
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+%%EndResource
+%%BeginResource: font lsd
+%!PS-AdobeFont-1.1: LucidaSans-Demi 1.001
+%%CreationDate: 1993 Aug 11 21:10:03
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (1.001) readonly def
+/Notice ((c) 1992 Bigelow & Holmes Inc. All rights reserved. ) readonly def
+/Notice ((c) 1992 by Y&Y Inc. All Rights Reserved.) readonly def
+/FullName (Lucida Sans Demibold) readonly def
+/FamilyName (LucidaSans) readonly def
+/Weight (Demibold) readonly def
+/ItalicAngle 0 def
+/isFixedPitch false def
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+/UnderlineThickness 50 def
+end readonly def
+/FontName /LucidaSans-Demi def
+/PaintType 0 def
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+/FontMatrix [0.001 0 0 0.001 0 0] readonly def
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+dup 54 /Aditi put
+dup 39 /Alessio put
+dup 41 /Ali put
+dup 47 /Andre put
+dup 49 /Andrzej put
+dup 51 /Angelika put
+dup 53 /Anton put
+dup 55 /Ari put
+dup 65 /Bent put
+dup 67 /Blair put
+dup 69 /Bonnie put
+dup 71 /Brian put
+dup 73 /Burkhard put
+dup 75 /Castor put
+dup 77 /Charles put
+dup 79 /Chi put
+dup 81 /Christian put
+dup 83 /Christoph put
+dup 85 /Chuck put
+dup 87 /Clovis put
+dup 89 /Cyrus put
+dup 189 /Heinz put
+dup 56 /Jacqueline put
+dup 57 /Jagannatha put
+dup 58 /Jan put
+dup 32 /Jeff put
+dup 66 /Joel put
+dup 38 /Johan put
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+dup 40 /Johnnie put
+dup 70 /Jon put
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+dup 48 /Justin put
+dup 78 /Kamal put
+dup 50 /Karl put
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+dup 102 /Louis put
+dup 104 /Luc put
+dup 106 /Lunjin put
+dup 110 /Malka put
+dup 112 /Manuel put
+dup 108 /Marcy put
+dup 114 /Mariusz put
+dup 116 /Martin put
+dup 118 /Masahiro put
+dup 120 /Matt put
+dup 122 /Maurizio put
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+dup 99 /Ron put
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+dup 45 /Will put
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+dup 109 /Sanjay put
+dup 111 /Saroj put
+dup 113 /Saul put
+dup 115 /Saulius put
+dup 117 /Scott put
+dup 119 /Sean put
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+currentdict end
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+cleartomark
+%%EndResource
+%%BeginResource: font lbtr
+%!PS-AdobeFont-1.1: LucidaTypewriter 1.001
+%%CreationDate: 1994 Nov 12 10:47:10
+% Lucida is a registered trademark of Bigelow & Holmes Inc.
+% NOTE:  This is a partial font in Adobe Type 1 format.
+% The complete font in fully hinted ATM compatible form is available from Y&Y
+% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
+11 dict begin
+/FontInfo 9 dict dup begin
+/version (1.001) readonly def
+/Notice ((c) 1993, 1994 Bigelow & Homes Inc. Pat. Des. 289,422. All Rights Reserved.) readonly def
+/Notice ((c) 1994 Y&Y Inc. All Rights Reserved.) readonly def
+/FullName (Lucida Typewriter) readonly def
+/FamilyName (LucidaTypewriter) readonly def
+/Weight (Medium) readonly def
+/ItalicAngle 0 def
+/isFixedPitch true def
+/UnderlinePosition -100 def
+/UnderlineThickness 50 def
+end readonly def
+/FontName /LucidaTypewriter def
+/PaintType 0 def
+/FontType 1 def
+/FontMatrix [0.001 0 0 0.001 0 0] readonly def
+/Encoding 256 array
+0 1 255 {1 index exch /.notdef put} for
+dup 54 /Aditi put
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+dup 37 /Alasdair put
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+dup 187 /Don put
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+dup 179 /Hong put
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+dup 32 /Jeff put
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+dup 70 /Jon put
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+dup 45 /Will put
+dup 247 /Waldo put
+dup 215 /Wilfred put
+readonly def
+/FontBBox{0 -211 743 940}readonly def
+%/UniqueID 5054489 def
+currentdict end
+currentfile eexec
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+(Trans.) 4549 5364 w
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+(Graph.,) 910 5484 w
+10 /LucidaSans-Demi f
+(1) 1308 5484 w
+10 /LucidaSansUnicode00 f
+(, \(3\), 191-214 \(1982\).) 1372 5484 w
+(19. R.) 720 5640 w
+(Pike,) 1039 5640 w
+(B.) 1303 5640 w
+(Locanthi) 1428 5640 w
+(and) 1873 5640 w
+(J.) 2088 5640 w
+(Reiser,) 2186 5640 w
+10 /LucidaSansUnicode20 f
+(\030) 2549 5640 w
+10 /LucidaSansUnicode00 f
+(Hardware/software) 2581 5640 w
+(trade-offs) 3546 5640 w
+(for) 4077 5640 w
+(bitmap) 4251 5640 w
+(graphics) 4626 5640 w
+(on the Blit,) 910 5760 w
+10 /LucidaSansUnicode20 f
+(\031) 1437 5760 w
+10 /LucidaSans-Italic f
+(Softw. Pract. Exp.,) 1501 5760 w
+10 /LucidaSans-Demi f
+(15) 2416 5760 w
+10 /LucidaSansUnicode00 f
+(, \(2\), 131-151 \(1985\).) 2544 5760 w
+(20. T.) 720 5916 w
+(A.) 1046 5916 w
+(Cargill,) 1189 5916 w
+10 /LucidaSansUnicode20 f
+(\030) 1577 5916 w
+10 /LucidaSansUnicode00 f
+(The) 1609 5916 w
+(feel) 1832 5916 w
+(of) 2052 5916 w
+(Pi,) 2192 5916 w
+10 /LucidaSansUnicode20 f
+(\031) 2308 5916 w
+10 /LucidaSans-Italic f
+(Winter) 2382 5916 w
+(USENIX) 2743 5916 w
+(Conference) 3129 5916 w
+(Proceedings,) 3715 5916 w
+(Denver) 4370 5916 w
+(1986,) 4756 5916 w
+10 /LucidaSansUnicode00 f
+(62-71, USENIX Assoc., El Cerrito, CA.) 910 6036 w
+(21. G. J. Holzmann, ) 720 6192 w
+10 /LucidaSansUnicode20 f
+(\030) 1698 6192 w
+10 /LucidaSansUnicode00 f
+(Tracing protocols,) 1730 6192 w
+10 /LucidaSansUnicode20 f
+(\031) 2612 6192 w
+10 /LucidaSans-Italic f
+(AT&T Tech. J.,) 2676 6192 w
+10 /LucidaSans-Demi f
+(64) 3399 6192 w
+10 /LucidaSansUnicode00 f
+(, \(10\), 2413-2434 \(1985\).) 3527 6192 w
+cleartomark
+showpage
+saveobj restore
+%%EndPage: 30 30
+%%Trailer
+done
+%%Pages: 30
diff --git a/sys/doc/sam/sam.tut b/sys/doc/sam/sam.tut
new file mode 100644
index 000000000..c00e35f2f
--- /dev/null
+++ b/sys/doc/sam/sam.tut
@@ -0,0 +1,1784 @@
+.de P1
+.KS
+.DS
+.ft CW
+.ta 5n 10n 15n 20n 25n 30n 35n 40n 45n 50n 55n 60n 65n 70n 75n 80n
+..
+.de P2
+.ft 1
+.DE
+.KE
+..
+.de CW
+.lg 0
+\%\&\\$3\f(CW\\$1\fP\&\\$2
+.lg
+..
+.de WC
+.lg 0
+\%\&\\$3\f(CI\\$1\fP\&\\$2
+.lg
+..
+.TL
+A tutorial for the
+.CW sam
+.B
+command language
+.AU
+Rob Pike
+.AI
+.MH
+.AB
+.CW sam
+is an interactive text editor with a command language that makes heavy use
+of regular expressions.
+Although the language is syntactically similar to
+.CW ed (1),
+the details are interestingly different.
+This tutorial introduces the command language, but does not discuss
+the screen and mouse interface.
+With apologies to those unfamiliar with the Ninth Edition Blit software,
+it is assumed that the similarity of
+.CW sam
+to
+.CW mux (9)
+at this level makes
+.CW sam 's
+mouse language easy to learn.
+.PP
+The
+.CW sam
+command language applies identically to two environments:
+when running
+.CW sam
+on an ordinary terminal
+(\f2via\f1\f1
+.CW sam\ -d ),
+and in the command window of a
+.I downloaded
+.CW sam ,
+that is, one using the bitmap display and mouse.
+.AE
+.SH
+Introduction
+.PP
+This tutorial describes the command language of
+.CW sam ,
+an interactive text editor that runs on Blits and
+some computers with bitmap displays.
+For most editing tasks, the mouse-based editing features
+are sufficient, and they are easy to use and to learn.
+.PP
+The command language is often useful, however, particularly
+when making global changes.
+Unlike the commands in
+.CW ed ,
+which are necessary to make changes,
+.CW sam
+commands tend to be used
+only for complicated or repetitive editing tasks.
+It is in these more involved uses that
+the differences between
+.CW sam
+and other text editors are most evident.
+.PP
+.CW sam 's
+language makes it easy to do some things that other editors,
+including programs like
+.CW sed
+and
+.CW awk ,
+do not handle gracefully, so this tutorial serves partly as a
+lesson in
+.CW sam 's
+manner of manipulating text.
+The examples below therefore concentrate entirely on the language,
+assuming that facility with the use of the mouse in
+.CW sam
+is at worst easy to pick up.
+In fact,
+.CW sam
+can be run without the mouse at all (not
+.I downloaded ),
+by specifying the
+.CW -d
+flag, and it is this domain that the tutorial
+occupies; the command language in these modes
+are identical.
+.PP
+A word to the Unix adept:
+although
+.CW sam
+is syntactically very similar to
+.CW ed ,
+it is fundamentally and deliberately different in design and detailed semantics.
+You might use knowledge of
+.CW ed
+to predict how the substitute command works,
+but you'd only be right if you had used some understanding of
+.CW sam 's
+workings to influence your prediction.
+Be particularly careful about idioms.
+Idioms form in curious nooks of languages and depend on
+undependable peculiarities.
+.CW ed
+idioms simply don't work in
+.CW sam :
+.CW 1,$s/a/b/
+makes one substitution in the whole file, not one per line.
+.CW sam
+has its own idioms.
+Much of the purpose of this tutorial is to publish them
+and make fluency in
+.CW sam
+a matter of learning, not cunning.
+.PP
+The tutorial depends on familiarity with regular expressions, although
+some experience with a more traditional Unix editor may be helpful.
+To aid readers familiar with
+.CW ed ,
+I have pointed out in square brackets [] some of
+the relevant differences between
+.CW ed
+and
+.CW sam .
+Read these comments only if you wish
+to understand the differences; the lesson is about
+.CW sam ,
+not
+.CW sam
+.I vs.
+.CW ed .
+Another typographic convention is that output appears in
+.CW "this font,
+while typed input appears as
+.WC "slanty text.
+.PP
+Nomenclature:
+.CW sam
+keeps a copy of the text it is editing.
+This copy is called a
+.I file .
+To avoid confusion, I have called the permanent storage on disc a
+.I
+Unix file.
+.R
+.SH
+Text
+.PP
+To get started, we need some text to play with.
+Any text will do; try something from
+James Gosling's Emacs manual:
+.P1
+$ \f(CIsam -d
+a
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+\&.
+.ft
+.P2
+.WC "sam -d
+starts
+.CW sam
+running.
+The
+.CW a
+command adds text until a line containing just a period, and sets the
+.I
+current text
+.R
+(also called
+.I dot )
+to what was typed \(em everything between the
+.CW a
+and the period.
+.CW ed "" [
+would leave dot set to only the last line.]
+The
+.CW p
+command prints the current text:
+.P1
+.WC p
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.P2
+[Again,
+.CW ed
+would print only the last line.]
+The
+.CW a
+command adds its text
+.I after
+dot; the
+.CW i
+command is like
+.CW a,
+but adds the text
+.I before
+dot.
+.P1
+.ft CI
+i
+Introduction
+\&.
+p
+.ft
+Introduction
+.P2
+There is also a
+.CW c
+command that changes (replaces) the current text,
+and
+.CW d
+that deletes it; these are illustrated below.
+.PP
+To see all the text, we can specify what text to print;
+for the moment, suffice it to say that
+.WC 0,$
+specifies the entire file.
+.CW ed "" [
+users would probably type
+.WC 1,$ ,
+which in practice is the same thing, but see below.]
+.P1
+.WC 0,$p
+Introduction
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.P2
+Except for the
+.CW w
+command described below,
+.I all
+commands,
+including
+.CW p ,
+set dot to the text they touch.
+Thus,
+.CW a
+and
+.CW i
+set dot to the new text,
+.CW p
+to the text printed, and so on.
+Similarly, all commands
+(except
+.CW w )
+by default operate on the current
+text [unlike
+.CW ed ,
+for which some commands (such as
+.CW g )
+default to the entire file].
+.PP
+Things are not going to get very interesting until we can
+set dot arbitrarily.
+This is done by
+.I addresses ,
+which specify a piece of the file.
+The address
+.CW 1 ,
+for example, sets dot to the first line of the file.
+.P1
+.WC 1p
+Introduction
+.WC c
+.WC Preamble
+.WC .
+.P2
+The
+.CW c
+command didn't need to specify dot; the
+.CW p
+left it on line one.
+It's therefore easy to delete the first line utterly;
+the last command left dot set to line one:
+.P1
+.WC d
+.WC 1p
+This manual is organized in a rather haphazard manner.  The first
+.P2
+(Line numbers change
+to reflect changes to the file.)
+.PP
+The address \f(CW/\f2text\f(CW/\f1
+sets dot to the first appearance of
+.I text ,
+after dot.
+.CW ed "" [
+matches the first line containing
+.I text .]
+If
+.I text
+is not found, the search restarts at the beginning of the file
+and continues until dot.
+.P1
+.WC /Emacs/p
+Emacs
+.P2
+It's difficult to indicate typographically, but in this example no newline appears
+after
+.CW Emacs :
+the text to be printed is the string
+.CW Emacs ', `
+exactly.
+(The final
+.CW p
+may be left off \(em it is the default command.
+When downloaded, however, the default is instead to select the text,
+to highlight it,
+and to make it visible by moving the window on the file if necessary.
+Thus,
+.CW /Emacs/
+indicates on the display the next occurrence of the text.)
+.PP
+Imagine we wanted to change the word
+.CW haphazard
+to
+.CW thoughtless .
+Obviously, what's needed is another
+.CW c
+command, but the method used so far to insert text includes a newline.
+The syntax for including text without newlines is to surround the
+text with slashes (which is the same as the syntax for
+text searches, but what is going on should be clear from context).
+The text must appear immediately after the
+.CW c
+(or
+.CW a
+or
+.CW i ).
+Given this, it is easy to make the required change:
+.P1
+.WC /haphazard/c/thoughtless/
+.WC 1p
+This manual is organized in a rather thoughtless manner.  The first
+.P2
+[Changes can always be done with a
+.CW c
+command, even if the text is smaller than a line].
+You'll find that this way of providing text to commands is much
+more common than is the multiple-lines syntax.
+If you want to include a slash
+.CW /
+in the text, just precede it with a backslash
+.CW \e ,
+and use a backslash to protect a backslash itself.
+.P1
+.WC /Emacs/c/Emacs\e\e360/
+.WC 4p
+general introduction to the commands in Emacs\e360 and to try to show
+.P2
+We could also make this particular change by
+.P1
+.WC /Emacs/a/\e\e360/
+.P2
+.PP
+This is as good a place as any to introduce the
+.CW u
+command, which undoes the last command.
+A second
+.CW u
+will undo the penultimate command, and so on.
+.P1
+.WC u
+.WC 4p
+general introduction to the commands in Emacs and to try to show
+.WC u
+.WC 3p
+This manual is organized in a rather haphazard manner.  The first
+.P2
+Undoing can only back up; there is no way to undo a previous
+.CW u .
+.SH
+Addresses
+.PP
+We've seen the simplest forms of addresses, but there is more
+to learn before we can get too much further.
+An address selects a region in the file \(em a substring \(em
+and therefore must define the beginning and the end of a region.
+Thus, the address
+.CW 13
+selects from the beginning of line thirteen to the end of line thirteen, and
+.CW /Emacs/
+selects from the beginning of the word
+.CW Emacs ' `
+to the end.
+.PP
+Addresses may be combined with a comma:
+.P1
+13,15
+.P2
+selects lines thirteen through fifteen.  The definition of the comma
+operator is to select from the beginning of the left hand address (the
+beginning of line 13) to the end of the right hand address (the
+end of line 15).
+.PP
+A few special simple addresses come in handy:
+.CW .
+(a period) represents dot, the current text,
+.CW 0
+(line zero) selects the null string at the beginning of the file, and
+.CW $
+selects the null string at the end of the file
+[not the last line of the file].
+Therefore,
+.P1
+0,13
+.P2
+selects from the beginning of the file to the end of line thirteen,
+.P1
+\&.,$
+.P2
+selects from the beginning of the current text to the end of the file, and
+.P1
+0,$
+.P2
+selects the whole file [that is, a single string containing the whole file,
+not a list of all the lines in the file].
+.PP
+These are all
+.I absolute
+addresses: they refer to specific places in the file.
+.CW sam
+also has relative addresses, which depend
+on the value of dot,
+and in fact we have already seen one form:
+.CW /Emacs/
+finds the first occurrence of
+.CW Emacs
+searching forwards from dot.
+Which occurrence of
+.CW Emacs
+it finds depends on the value of dot.
+What if you wanted the first occurrence
+.CW before
+dot?  Just precede the pattern with a minus sign, which reverses the direction
+of the search:
+.P1
+-/Emacs/
+.P2
+In fact, the complete syntax for forward searching is
+.P1
++/Emacs/
+.P2
+but the plus sign is the default, and in practice is rarely used.
+Here is an example that includes it for clarity:
+.P1
+0+/Emacs/
+.P2
+selects the first occurrence of
+.CW Emacs
+in the file; read it as ``go to line 0, then search forwards for
+.CW Emacs .''
+Since the
+.CW +
+is optional, this can be written
+.CW 0/Emacs/ .
+Similarly,
+.P1
+$-/Emacs/
+.P2
+finds the last occurrence in the file, so
+.P1
+0/Emacs/,$-/Emacs/
+.P2
+selects the text from the first to last
+.CW Emacs ,
+inclusive.
+Slightly more interesting:
+.P1
+/Emacs/+/Emacs/
+.P2
+(there is an implicit
+.CW .+
+at the beginning) selects the second
+.CW Emacs
+following dot.
+.PP
+Line numbers may also be relative.
+.P1
+-2
+.P2
+selects the second previous line, and
+.P1
++5
+.P2
+selects the fifth following line (here the plus sign is obligatory).
+.PP
+Since addresses may select (and dot may be) more than one line,
+we need a definition of `previous' and `following:'
+`previous' means
+.I
+before the beginning
+.R
+of dot, and `following'
+means
+.I
+after the end
+.R
+of dot.
+For example, if the file contains \f(CWA\f(CIAA\f(CWA\f1,
+with dot set to the middle two
+.CW A 's
+(the slanting characters),
+.CW -/A/
+sets dot to the first
+.CW A ,
+and
+.CW +/A/
+sets dot to the last
+.CW A .
+Except under odd circumstances (such as when the only occurrence of the
+text in the file is already the current text), the text selected by a
+search will be disjoint from dot.
+.PP
+To select the
+.CW "troff -ms
+paragraph containing dot, however long it is, use
+.P1
+-/.PP/,/.PP/-1
+.P2
+which will include the
+.CW .PP
+that begins the paragraph, and exclude the one that ends it.
+.PP
+When typing relative line number addresses, the default number is
+.CW 1 ,
+so the above could be written slightly more simply:
+.P1
+-/.PP/,/.PP/-
+.P2
+.PP
+What does the address
+.CW +1-1
+or the equivalent
+.CW +-
+mean?  It looks like it does nothing, but recall that dot need not be a
+complete line of text.
+.CW +1
+selects the line after the end of the current text, and
+.CW -1
+selects the line before the beginning.  Therefore
+.CW +1-1
+selects the line before the line after the end of dot, that is,
+the complete line containing the end of dot.
+We can use this construction to expand a selection to include a complete line,
+say the first line in the file containing
+.CW Emacs :
+.P1
+.WC 0/Emacs/+-p
+general introduction to the commands in Emacs and to try to show
+.P2
+The address
+.CW +-
+is an idiom.
+.SH
+Loops
+.PP
+Above, we changed one occurrence of
+.CW Emacs
+to
+.CW Emacs\e360 ,
+but if the name of the editor is really changing, it would be useful
+to change
+.I all
+instances of the name in a single command.
+.CW sam
+provides a command,
+.CW x
+(extract), for just that job.
+The syntax is
+\f(CWx/\f2pattern\f(CW/\f2command\f1.
+For each occurrence of the pattern in the selected text,
+.CW x
+sets dot to the occurrence and runs command.
+For example, to change
+.CW Emacs
+to
+.CW vi,
+.P1
+.WC 0,$x/Emacs/c/vi/
+.WC 0,$p
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in vi and to try to show
+the method in the madness that is the vi command structure.
+.P2
+This
+works by subdividing the current text
+.CW 0,$ "" (
+\(em the whole file) into appearances of its textual argument
+.CW Emacs ), (
+and then running the command that follows
+.CW c/vi/ ) (
+with dot set to the text.
+We can read this example as, ``find all occurrences of
+.CW Emacs
+in the file, and for each one,
+set the current text to the occurrence and run the command
+.CW c/vi/ ,
+which will replace the current text by
+.CW vi. ''
+[This command is somewhat similar to
+.CW ed 's
+.CW g
+command.  The differences will develop below, but note that the
+default address, as always, is dot rather than the whole file.]
+.PP
+A single
+.CW u
+command is sufficient to undo an
+.CW x
+command, regardless of how many individual changes the
+.CW x
+makes.
+.P1
+.WC u
+.WC 0,$p
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.P2
+.PP
+Of course,
+.CW c
+is not the only command
+.CW x
+can run.  An
+.CW a
+command can be used to put proprietary markings on
+.CW Emacs :
+.P1
+.WC 0,$x/Emacs/a/{TM}/
+.WC /Emacs/+-p
+general introduction to the commands in Emacs{TM} and to try to show
+.P2
+[There is no way to see the changes as they happen, as in
+.CW ed 's
+.CW g/Emacs/s//&{TM}/p ;
+see the section on Multiple Changes, below.]
+.PP
+The
+.CW p
+command is also useful when driven by an
+.CW x ,
+but be careful that you say what you mean;
+.P1
+.WC 0,$x/Emacs/p
+EmacsEmacs
+.P2
+since
+.CW x
+sets dot to the text in the slashes, printing only that text
+is not going to be very
+informative.  But the command that
+.CW x
+runs can contain addresses.  For example, if we want to print all
+lines containing
+.CW Emacs ,
+just use
+.CW +- :
+.P1
+.WC 0,$x/Emacs/+-p
+general introduction to the commands in Emacs{TM} and to try to show
+the method in the madness that is the Emacs{TM} command structure.
+.P2
+Finally, let's restore the state of the file with another
+.CW x
+command, and make use of a handy shorthand:
+a comma in an address has its left side default to
+.CW 0 ,
+and its right side default to
+.CW $ ,
+so the easy-to-type address
+.CW ,
+refers to the whole file:
+.P1
+.WC ",x/Emacs/ /{TM}/d
+.WC ,p
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.P2
+Notice what this
+.CW x
+does: for each occurrence of Emacs,
+find the
+.CW {TM}
+that follows, and delete it.
+.PP
+The `text'
+.CW sam
+accepts
+for searches in addresses and in
+.CW x
+commands is not simple text, but rather
+.I regular\ expressions.
+Unix has several distinct interpretations of regular expressions.
+The form used by
+.CW sam
+is that of
+.CW egrep (1),
+including parentheses
+.CW ()
+for grouping and an `or' operator
+.CW |
+for matching strings in parallel.
+.CW sam
+makes two extensions:
+although
+.CW .
+(the most overloaded character in Unix) matches any character
+.I except
+newline, the regular expression
+.CW @
+(think of it as a big dot) matches any character, even newlines;
+and the character sequence
+.CW \en
+matches a newline character.
+Replacement text, such as used in the
+.CW a
+and
+.CW c
+commands, is still plain text, but the sequence
+.CW \en
+represents newline in that context, too.
+.PP
+Here is an example.  Say we wanted to double space the document, that is,
+turn every newline into two newlines.
+The following all do the job:
+.P1
+.WC ",x/\en/ a/\en/
+.WC ",x/\en/ c/\en\en/
+.WC ",x/$/ a/\en/
+.WC ",x/^/ i/\en/
+.P2
+The last example is slightly different, because it puts a newline
+.I before
+each line; the other examples place it after.
+The first two examples manipulate newlines directly
+[something outside
+.CW ed 's
+ken]; the last two
+use regular expressions:
+.CW $
+is the empty string at the end of a line, while
+.CW ^
+is the empty string at the beginning.
+.PP
+These solutions all have a possible drawback: if there is already a blank line
+(that is, two consecutive newlines), they make it much larger (four
+consecutive newlines).
+A better method is to extend every group of newlines by one:
+.P1
+.WC ",x/\en+/ a/\en/
+.P2
+The regular expression operator
+.CW +
+means `one or more;'
+.CW \en+
+is identical to
+.CW \en\en* .
+Thus, this example
+takes every sequence of newlines and adds another
+to the end.
+.PP
+A more common example is indenting a block of text by a tab stop.
+The following all work,
+although the first is arguably the cleanest (the blank text in slashes is a tab):
+.P1
+.WC ",x/^/a/	 /
+.WC ",x/^/c/	 /
+.WC ",x/.*\en/i/	 /
+.P2
+The last example uses the pattern (idiom, really)
+.CW .*\en
+to match lines:
+.CW .*
+matches the longest possible string of non-newline characters.
+Taking initial tabs away is just as easy:
+.P1
+.WC ",x/^    /d
+.P2
+In these examples I have specified an address (the whole file), but
+in practice commands like these are more likely to be run without
+an address, using the value of dot set by selecting text with the mouse.
+.SH
+Conditionals
+.PP
+The
+.CW x
+command is a looping construct:
+for each match of a regular expression,
+it extracts (sets dot to) the match and runs a command.
+.CW sam
+also has a conditional,
+.CW g :
+\f(CWg/\f2pattern\f(CW/\f2command\f1
+runs the command if dot contains a match of the pattern
+.I
+without changing the value of dot.
+.R
+The inverse,
+.CW v ,
+runs the command if dot does
+.I not
+contain a match of the pattern.
+(The letters
+.CW g
+and
+.CW v
+are historical and have no mnemonic significance.  You might
+think of
+.CW g
+as `guard.')
+.CW ed "" [
+users should read the above definitions very carefully; the
+.CW g
+command in
+.CW sam
+is fundamentally different from that in
+.CW ed .]
+Here is an example of the difference between
+.CW x
+and
+.CW g:
+.P1
+,x/Emacs/c/vi/
+.P2
+changes each occurrence of the word
+.CW Emacs
+in the file to the word
+.CW vi ,
+but
+.P1
+,g/Emacs/c/vi/
+.P2
+changes the
+.I "whole file
+to
+.CW vi
+if there is the word
+.CW Emacs
+anywhere in the file.
+.PP
+Neither of these commands is particularly interesting in isolation,
+but they are valuable when combined with
+.CW x
+and with themselves.
+.SH
+Composition
+.PP
+One way to think about the
+.CW x
+command is that, given a selection (a value of dot)
+it iterates through interesting subselections (values of dot within).
+In other words, it takes a piece of text and cuts it into smaller pieces.
+But the text that it cuts up may already be a piece cut by a previous
+.CW x
+command or selected by a
+.CW g .
+.CW sam 's
+most interesting property is the ability to define a sequence of commands
+to perform a particular task.\(dg
+.FS
+\(dg
+The obvious analogy with shell pipelines is only partially valid,
+because the individual
+.CW sam
+commands are all working on the same text; it is only how the text is
+sliced up that is changing.
+.FE
+A simple example is to change all occurrences of
+.CW Emacs
+to
+.CW emacs ;
+certainly the command
+.P1
+.WC ",x/Emacs/ c/emacs/
+.P2
+will work, but we can use an
+.CW x
+command to save retyping most of the word
+.CW Emacs :
+.P1
+.WC ",x/Emacs/ x/E/ c/e/
+.P2
+(Blanks can be used
+to separate commands on a line to make them easier to read.)
+What this command does is find all occurrences of
+.CW Emacs
+.CW ,x/Emacs/ ), (
+and then
+.I
+with dot set to that text,
+.R
+find all occurrences of the letter
+.CW E
+.CW x/E/ ), (
+and then
+.I
+with dot set to that text,
+.R
+run the command
+.CW c/e/
+to change the character to lower case.
+Note that the address for the command \(em the whole file, specified by a comma
+\(em is only given to the leftmost
+piece of the command; the rest of the pieces have dot set for them by
+the execution of the pieces to their left.
+.PP
+As another simple example, consider a problem
+solved above: printing all lines in the file containing the word
+.CW Emacs:
+.P1
+.WC ",x/.*\en/ g/Emacs/p
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.P2
+This command says to break the file into lines
+.CW ,x/.*\en/ ), (
+and for each line that contains the string
+.CW Emacs
+.CW g/Emacs/ ), (
+run the command
+.CW p
+with dot set to the line (not the match of
+.CW Emacs ),
+which prints the line.
+To save typing, because
+.CW .*\en
+is a common pattern in
+.CW x
+commands,
+if the
+.CW x
+is followed immediately by a space, the pattern
+.CW .*\en
+is assumed.
+Therefore, the above could be written more succinctly:
+.P1
+.WC ",x g/Emacs/p
+.P2
+The solution we used before was
+.P1
+.WC ,x/Emacs/+-p
+.P2
+which runs the command
+.CW +-p
+with dot set to each match of
+.CW Emacs
+in the file (recall that the idiom
+.CW +-p
+prints the line containing the end of dot).
+.PP
+The two commands usually produce the same result
+(the
+.CW +-p
+form will print a line twice if it contains
+.CW Emacs
+twice).  Which is better?
+.CW ,x/Emacs/+-p
+is easier to type and will be much faster if the file is large and
+there are few occurrences of the string, but it is really an odd special case.
+.CW ",x/.*\en/ g/Emacs/p
+is slower \(em it breaks each line out separately, then examines
+it for a match \(em but is conceptually cleaner, and generalizes more easily.
+For example, consider the following piece of the Emacs manual:
+.P1
+command name="append-to-file", key="[unbound]"
+Takes the contents of the current buffer and appends it to the
+named file. If the files doesn't exist, it will be created.
+
+command name="apropos", key="ESC-?"
+Prompts for a keyword and then prints a list of those commands
+whose short description contains that keyword.  For example,
+if you forget which commands deal with windows, just type
+"@b[ESC-?]@t[window]@b[ESC]".
+
+\&\f2and so on\f(CW
+.P2
+This text consists of groups of non-empty lines, with a simple format
+for the text within each group.
+Imagine that we wanted to find the description of the `apropos'
+command.
+The problem is to break the file into individual descriptions,
+and then to find the description of `apropos' and to print it.
+The solution is straightforward:
+.P1
+.WC ,x/(.+\en)+/\ g/command\ name="apropos"/p
+command name="apropos", key="ESC-?"
+Prompts for a keyword and then prints a list of those commands
+whose short description contains that keyword.  For example,
+if you forget which commands deal with windows, just type
+"@b[ESC-?]@t[window]@b[ESC]".
+.P2
+The regular expression
+.CW (.+\en)+
+matches one or more lines with one or more characters each, that is,
+the text between blank lines, so
+.CW ,x/(.+\en)+/
+extracts each description; then
+.CW g/command\ name="apropos"/
+selects the description for `apropos' and
+.CW p
+prints it.
+.PP
+Imagine that we had a C program containing the variable
+.CW n ,
+but we wanted to change it to
+.CW num .
+This command is a first cut:
+.P1
+.WC ",x/n/ c/num/
+.P2
+but is obviously flawed: it will change all
+.CW n 's
+in the file, not just the
+.I identifier
+.CW n .
+A better solution is to use an
+.CW x
+command to extract the identifiers, and then use
+.CW g
+to find the
+.CW n 's:
+.P1
+.WC ",x/[a-zA-Z_][a-zA-Z_0-9]*/ g/n/ v/../ c/num/
+.P2
+It looks awful, but it's fairly easy to understand when read
+left to right.
+A C identifier is an alphabetic or underscore followed by zero or more
+alphanumerics or underscores, that is, matches of the regular expression
+.CW [a-zA-Z_][a-zA-Z_0-9]* .
+The
+.CW g
+command selects those identifiers containing
+.CW n ,
+and the
+.CW v
+is a trick: it rejects those identifiers containing more than one
+character.  Hence the
+.CW c/num/
+applies only to free-standing
+.CW n 's.
+.PP
+There is still a problem here:
+we don't want to change
+.CW n 's
+that are part of the character constant
+.CW \en .
+There is a command
+.CW y ,
+complementary to
+.CW x ,
+that is just what we need:
+\f(CWy/\f2pattern\f(CW/\f2command\f1
+runs the command on the pieces of text
+.I between
+matches of the pattern;
+if
+.CW x
+selects,
+.CW y
+rejects.
+Here is the final command:
+.P1
+.WC ",y/\e\en/ x/[a-zA-Z_][a-zA-Z_0-9]*/ g/n/ v/../ c/num/
+.P2
+The
+.CW y/\e\en/
+(with backslash doubled to make it a literal character)
+removes the two-character sequence
+.CW \en
+from consideration, so the rest of the command will not touch it.
+There is more we could do here; for example, another
+.CW y
+could be prefixed to protect comments in the code.
+I won't elaborate the example any further, but you should have
+an idea of the way in which the looping and conditional commands
+in
+.CW sam
+may be composed to do interesting things.
+.SH
+Grouping
+.PP
+There is another way to arrange commands.
+By enclosing them in brace brackets
+.CW {} ,
+commands may be applied in parallel.
+This example uses the
+.CW =
+command, which reports the line and character numbers of dot,
+together with
+.CW p ,
+to report on appearances of
+.CW Emacs
+in our original file:
+.P1
+.WC ,p
+This manual is organized in a rather haphazard manner.  The first
+several sections were written hastily in an attempt to provide a
+general introduction to the commands in Emacs and to try to show
+the method in the madness that is the Emacs command structure.
+.ft CI
+,x/Emacs/{
+	=
+	+-p
+}
+.ft
+3; #171,#176
+general introduction to the commands in Emacs and to try to show
+4; #234,#239
+the method in the madness that is the Emacs command structure.
+.P2
+(The number before the semicolon is the line number;
+the numbers beginning with
+.CW #
+are character numbers.)
+As a more interesting example, consider changing all occurrences of
+.CW Emacs
+to
+.CW vi
+and vice versa.  We can type
+.P1
+.ft CI
+,x/Emacs|vi/{
+	g/Emacs/ c/vi/
+	g/vi/ c/Emacs/
+}
+.ft
+.P2
+or even
+.P1
+.ft CI
+,x/[a-zA-Z]+/{
+	g/Emacs/ v/....../ c/vi/
+	g/vi/ v/.../ c/Emacs/
+}
+.ft
+.P2
+to make sure we don't change strings embedded in words.
+.SH
+Multiple Changes
+.PP
+You might wonder why, once
+.CW Emacs
+has been changed to
+.CW vi
+in the above example,
+the second command in the braces doesn't put it back again.
+The reason is that the commands are run in parallel:
+within any top-level
+.CW sam
+command, all changes to the file refer to the state of the file
+before any of the changes in that command are made.
+After all the changes have been determined, they are all applied
+simultaneously.
+.PP
+This means, as mentioned, that commands within a compound
+command see the state of the file before any of the changes apply.
+This method of evaluation makes some things easier (such as the exchange of
+.CW Emacs
+and
+.CW vi ),
+and some things harder.
+For instance, it is impossible to use a
+.CW p
+command to print the changes as they happen,
+because they haven't happened when the
+.CW p
+is executed.
+An indirect ramification is that changes must occur in forward
+order through the file,
+and must not overlap.
+.SH
+Unix
+.PP
+.CW sam
+has a few commands to connect to Unix processes.
+The simplest is
+.CW ! ,
+which runs the command with input and output connected to the terminal.
+.P1
+.WC !date
+Wed May 28 23:25:21 EDT 1986
+!
+.P2
+(When downloaded, the input is connected to
+.CW /dev/null
+and only the first few lines of output are printed;
+any overflow is stored in
+.CW $HOME/sam.err .)
+The final
+.CW !
+is a prompt to indicate when the command completes.
+.PP
+Slightly more interesting is
+.CW > ,
+which provides the current text as standard input to the Unix command:
+.P1
+.WC "1,2 >wc
+      2       22      131
+!
+.P2
+The complement of
+.CW >
+is, naturally,
+.CW < :
+it replaces the current text with the standard output of the Unix command:
+.P1
+.WC "1 <date
+!
+.WC 1p
+Wed May 28 23:26:44 EDT 1986
+.P2
+The last command is
+.CW | ,
+which is a combination of
+.CW <
+and
+.CW > :
+the current text is provided as standard input to the Unix command,
+and the Unix command's standard output is collected and used to
+replace the original text.
+For example,
+.P1
+.WC ",| sort
+.P2
+runs
+.CW sort (1)
+on the file, sorting the lines of the text lexicographically.
+Note that
+.CW < ,
+.CW >
+and
+.CW |
+are
+.CW sam
+commands, not Unix shell operators.
+.PP
+The next example converts all appearances of
+.CW Emacs
+to upper case using
+.CW tr (1):
+.P1
+.WC ",x/Emacs/ | tr a-z A-Z
+.P2
+.CW tr
+is run once for each occurrence of
+.CW Emacs .
+Of course, you could do this example more efficiently with a simple
+.CW c
+command, but here's a trickier one:
+given a Unix mail box as input,
+convert all the
+.CW Subject
+headers to distinct fortunes:
+.P1
+.WC ",x/^Subject:.*\en/ x/[^:]*\en/ < /usr/games/fortune
+.P2
+(The regular expression
+.CW [^:]
+refers to any character
+.I except
+.CW :
+and newline; the negation operator
+.CW ^
+excludes newline from the list of characters.) 
+Again,
+.CW /usr/games/fortune
+is run once for each
+.CW Subject
+line, so each
+.CW Subject
+line is changed to a different fortune.
+.SH
+A few other text commands
+.PP
+For completeness, I should mention three other commands that
+manipulate text.  The
+.CW m
+command moves the current text to after the text specified by the
+(obligatory) address after the command.
+Thus
+.P1
+.WC "/Emacs/+- m 0
+.P2
+moves the next line containing
+.CW Emacs
+to the beginning of the file.
+Similarly,
+.CW t
+(another historic character) copies the text:
+.P1
+.WC "/Emacs/+- t 0
+.P2
+would make, at the beginning of the file, a copy of the next line
+containing
+.CW Emacs .
+.PP
+The third command is more interesting: it makes substitutions.
+Its syntax is
+\f(CWs/\f2pattern\f(CW/\f2replacement\f(CW/\f1.
+Within the current text, it finds the first occurrence of
+the pattern and replaces it by the replacement text,
+leaving dot set to the entire address of the substitution.
+.P1
+.WC 1p
+This manual is organized in a rather haphazard manner.  The first
+.WC s/haphazard/thoughtless/
+.WC p
+This manual is organized in a rather thoughtless manner.  The first
+.P2
+Occurrences of the character
+.CW &
+in the replacement text stand for the text matching the pattern.
+.P1
+.WC s/T/"&&&&"/
+.WC p
+"TTTT"his manual is organized in a rather thoughtless manner.  The first
+.P2
+There are two variants.  The first is that a number may be specified
+after the
+.CW s ,
+to indicate which occurrence of the pattern to substitute; the default
+is the first.
+.P1
+.WC s2/is/was/
+.WC p
+"TTTT"his manual was organized in a rather thoughtless manner.  The first
+.P2
+The second is that suffixing a
+.CW g
+(global) causes replacement of all occurrences, not just the first.
+.P1
+.WC s/[a-zA-Z]/x/g
+.WC p
+"xxxx"xxx xxxxxx xxx xxxxxxxxx xx x xxxxxx xxxxxxxxxxx xxxxxxx  xxx xxxxx
+.P2
+Notice that in all these examples
+dot is left
+set to the entire line.
+.PP
+[The substitute command is vital to
+.CW ed,
+because it is the only way to make changes within a line.
+It is less valuable in
+.CW sam ,
+in which the concept of a line is much less important.
+For example, many
+.CW ed
+substitution idioms are handled well by
+.CW sam 's
+basic commands. Consider the commands
+.P1
+s/good/bad/
+s/good//
+s/good/& bye/
+.P2
+which are equivalent in
+.CW sam
+to
+.P1
+/good/c/bad/
+/good/d
+/good/a/ bye/
+.P2
+and for which the context search is likely unnecessary because the desired
+text is already dot.
+Also, beware this
+.CW ed
+idiom:
+.P1
+1,$s/good/bad/
+.P2
+which changes the first
+.CW good
+on each line; the same command in
+.CW sam
+will only change the first one in the whole file.
+The correct
+.CW sam
+version is
+.P1
+,x s/good/bad/
+.P2
+but what is more likely meant is
+.P1
+,x/good/ c/bad/
+.P2
+.CW sam
+operates under different rules.]
+.SH
+Files
+.PP
+So far, we have only been working with a single file,
+but
+.CW sam
+is a multi-file editor.
+Only one file may be edited at a time, but
+it is easy to change which file is the `current' file for editing.
+To see how to do this, we need a
+.CW sam
+with a few files;
+the easiest way to do this is to start it
+with a list of Unix file names to edit.
+.P1
+$ \f(CIecho *.ms\f(CW
+conquest.ms death.ms emacs.ms famine.ms slaughter.ms
+$ \f(CIsam -d *.ms\f(CW
+ -. conquest.ms
+.P2
+(I'm sorry the Horsemen don't appear in liturgical order.)
+The line printed by
+.CW sam
+is an indication that the Unix file
+.CW conquest.ms
+has been read, and is now the current file.
+.CW sam
+does not read the Unix file until
+the associated
+.CW sam
+file becomes current.
+.PP
+The
+.CW n
+command prints the names of all the files:
+.P1
+.WC n
+ -. conquest.ms
+ -  death.ms
+ -  emacs.ms
+ -  famine.ms
+ -  slaughter.ms
+.P2
+This list is also available in the menu on mouse button 3.
+The command
+.CW f
+tells the name of just the current file:
+.P1
+.WC f
+ -. conquest.ms
+.P2
+The characters to the left of the file name encode helpful information about
+the file.
+The minus sign becomes a plus sign if the file has a window open, and an
+asterisk if more than one is open.
+The period (another meaning of dot) identifies the current file.
+The leading blank changes to an apostrophe if the file is different
+from the contents of the associated Unix file, as far as
+.CW sam
+knows.
+This becomes evident if we make a change.
+.P1
+.WC 1d
+.WC f
+\&'-. conquest.ms
+.P2
+If the file is restored by an undo command, the apostrophe disappears.
+.P1
+.WC u
+.WC f
+ -. conquest.ms
+.P2
+The file name may be changed by providing a new name with the
+.CW f
+command:
+.P1
+.CW "f pestilence.ms
+\&'-. pestilence.ms
+.P2
+.WC f
+prints the new status of the file,
+that is, it changes the name if one is provided, and prints the
+name regardless.
+A file name change may also be undone.
+.P1
+.WC u
+.WC f
+ -. conquest.ms
+.P2
+.PP
+When
+.CW sam
+is downloaded, the current file may be changed simply by selecting
+the desired file from the menu (selecting the same file subsequently
+cycles through the windows opened on the file).
+Otherwise, the
+.CW b
+command can be used to choose the desired file:\(dg
+.FS
+\(dg A bug prevents the
+.CW b
+command from working when downloaded.
+Because the menu is more convenient anyway, and
+because the method
+of choosing files from the command language is slated to change,
+the bug hasn't been fixed.
+.FE
+.P1
+.WC "b emacs.ms
+ -. emacs.ms
+.P2
+Again,
+.CW sam
+prints the name (actually, executes an implicit
+.CW f
+command) because the Unix file
+.CW emacs.ms
+is being read for the first time.
+It is an error to ask for a file
+.CW sam
+doesn't know about, but the
+.CW B
+command will prime
+.CW sam 's
+menu with a new file, and make it current.
+.P1
+.WC "b flood.pic
+?no such file `flood.pic'
+.WC "B flood.pic
+ -. flood.pic
+.WC n
+ -  conquest.ms
+ -  death.ms
+ -  emacs.ms
+ -  famine.ms
+ -. flood.pic
+ -  slaughter.ms
+.P2
+Both
+.CW b
+and
+.CW B
+will accept a list of file names.
+.CW b
+simply takes the first file in the list, but
+.CW B
+loads them all.
+The list may be typed on one line \(em
+.P1
+.WC "B devil.tex satan.tex 666.tex emacs.tex
+.P2
+\(em or generated by a Unix command \(em
+.P1
+.WC "B <echo *.tex
+.P2
+The latter form requires a Unix command;
+.CW sam
+does not understand the shell file name metacharacters, so
+.CW "B *.tex
+attempts to load a single file named
+.CW *.tex .
+(The
+.CW <
+form is of course derived from
+.CW sam 's
+.CW <
+command.)
+.CW echo
+is not the only useful command to run subservient to
+.CW B ;
+for example,
+.P1
+.WC "B <grep -l Emacs *
+.P2
+will load only those files containing the string
+.CW Emacs .
+Finally, a special case: a
+.CW B
+with no arguments creates an empty, nameless file within
+.CW sam .
+.PP
+The complement of
+.CW B
+is
+.CW D :
+.P1
+.WC "D devil.tex satan.tex 666.tex emacs.tex
+.P2
+eradicates the files from
+.CW sam 's
+memory (not from the Unix machine's disc).
+.CW D
+without any file names removes the current file from
+.CW sam .
+.PP
+There are three other commands that relate the current file
+to Unix files.
+The
+.CW w
+command writes the file to disc;
+without arguments, it writes the entire file to the Unix file associated
+with the current file in
+.CW sam
+(it is the only command whose default address is not dot).
+Of course, you can specify an address to be written,
+and a different file name, with the obvious syntax:
+.P1
+.WC "1,2w /tmp/revelations
+/tmp/revelations: #44
+.P2
+.CW sam
+responds with the file name and the number of characters written to the file.
+The
+.CW write
+command on the button 3 menu is identical in function to an unadorned
+.CW w
+command.
+.PP
+The other two commands,
+.CW e
+and
+.CW r ,
+read data from Unix files.
+The
+.CW e
+command clears out the current file,
+reads the data from the named file (or uses the current file's old name if
+none is explicitly provided), and sets the file name.
+It's much like a
+.CW B
+command, but puts the information in the current file instead of a new one.
+.CW e
+without any file name is therefore an easy way to refresh
+.CW sam 's
+copy of a Unix file.
+[Unlike in
+.CW ed ,
+.CW e
+doesn't complain if the file is modified.  The principle is not
+to protect against things that can be undone if wrong.]
+Since its job is to replace the whole text,
+.CW e
+never takes an address.
+.PP
+The
+.CW r
+command is like
+.CW e ,
+but it doesn't clear the file:
+the text in the Unix file replaces dot, or the specified text if an
+address is given.
+.P1
+.WC "r emacs.ms
+.P2
+has essentially the effect of
+.P1
+.WC "<cat emacs.ms
+.P2
+The commands
+.CW r
+and
+.CW w
+will set the name of the file if the current file has no name already defined;
+.CW e
+sets the name even if the file already has one.
+.PP
+There is a command, analogous to
+.CW x ,
+that iterates over files instead of pieces of text:
+.CW X
+(capital
+.CW x ).
+The syntax is easy; it's just like that of
+.CW x
+\(em \f(CWX/\f2pattern\f(CW/\f2command\f1.
+(The complementary command is
+.CW Y ,
+analogous to
+.CW y .)
+The effect is to run the command in each file whose menu entry
+(that is, whose line printed by an
+.CW f
+command) matches the pattern.
+For example, since an apostrophe identifies modified files,
+.P1
+.WC "X/'/ w
+.P2
+writes the changed files out to disc.
+Here is a longer example: find all uses of a particular variable
+in the C source files:
+.P1
+.WC "X/\e.c$/ ,x/variable/+-p
+.P2
+We can use an
+.CW f
+command to identify which file the variable appears in:
+.P1
+.ft CI
+X/\e.c$/ ,g/variable/ {
+	f
+	,x/variable/+-{
+		=
+		p
+	}
+}
+.ft
+.P2
+Here, the
+.CW g
+command guarantees that only the names of files containing the variable
+will be printed (but beware that
+.CW sam
+may confuse matters by printing the names of files it reads in during
+the command).
+The
+.CW =
+command shows where in the file the variable appears, and the
+.CW p
+command prints the line.
+.PP
+The
+.CW D
+command is handy as the target of an
+.CW X .
+This example deletes from the menu all C files that do not contain
+a particular variable:
+.P1
+.WC "X/\e.c$/ ,v/variable/ D
+.P2
+If no pattern is provided for the
+.CW X ,
+the command (which defaults to
+.CW f )
+is run in all files, so
+.P1
+.WC "X D
+.P2
+cleans
+.CW sam
+up for a fresh start.
+.PP
+But rather than working any further, let's stop now:
+.P1
+.WC q
+$
+.P2
+.fi
+.PP
+Some of the file manipulating commands can be undone:
+undoing a
+.CW f ,
+.CW e ,
+or
+.CW r
+restores the previous state of the file,
+but
+.CW w ,
+.CW B
+and
+.CW D
+are irrevocable.
+And, of course, so is
+.CW q .
diff --git a/sys/doc/sam/sam.tut.out b/sys/doc/sam/sam.tut.out
new file mode 100644
index 000000000..3bdc36596
--- /dev/null
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new file mode 100644
index 000000000..eb488950f
--- /dev/null
+++ b/sys/doc/sam/sam0.png
diff --git a/sys/doc/sam/sam1.png b/sys/doc/sam/sam1.png
new file mode 100644
index 000000000..dcc645778
--- /dev/null
+++ b/sys/doc/sam/sam1.png
diff --git a/sys/doc/sam/sam2.png b/sys/doc/sam/sam2.png
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index 000000000..dfb72baba
--- /dev/null
+++ b/sys/doc/sam/sam2.png
diff --git a/sys/doc/sam/sam3.png b/sys/doc/sam/sam3.png
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index 000000000..f33a701c2
--- /dev/null
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diff --git a/sys/doc/sam/sam4.png b/sys/doc/sam/sam4.png
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