Import sources from 2011-03-30 iso image

1 files changed, 316 insertions, 0 deletions

diff --git a/sys/src/cmd/mc.c b/sys/src/cmd/mc.c
new file mode 100755
index 000000000..f48fbbf94
--- /dev/null
+++ b/sys/src/cmd/mc.c
@@ -0,0 +1,316 @@
+/*
+ * mc - columnate
+ *
+ * mc[-][-LINEWIDTH][-t][file...]
+ *	- causes break on colon
+ *	-LINEWIDTH sets width of line in which to columnate(default 80)
+ *	-t suppresses expanding multiple blanks into tabs
+ *
+ */
+#include	<u.h>
+#include	<libc.h>
+#include	<draw.h>
+#include	<bio.h>
+
+#define	WIDTH			80
+#define	TAB	4
+#define	WORD_ALLOC_QUANTA	1024
+#define	ALLOC_QUANTA		4096
+
+int linewidth=WIDTH;
+int mintab=1;
+int colonflag=0;
+int tabflag=0;	/* -t flag turned off forever */
+Rune *cbuf, *cbufp;
+Rune **word;
+int maxwidth=0;
+int nalloc=ALLOC_QUANTA;
+int nwalloc=WORD_ALLOC_QUANTA;
+int nchars=0;
+int nwords=0;
+int tabwidth=0;
+Font *font;
+Biobuf	bin;
+Biobuf	bout;
+
+void getwidth(void), readbuf(int), error(char *);
+void scanwords(void), columnate(void), morechars(void);
+int wordwidth(Rune*, int);
+int nexttab(int);
+
+void
+main(int argc, char *argv[])
+{
+	int i;
+	int lineset;
+	int ifd;
+
+	lineset = 0;
+	Binit(&bout, 1, OWRITE);
+	while(argc > 1 && argv[1][0] == '-'){
+		--argc; argv++;
+		switch(argv[0][1]){
+		case '\0':
+			colonflag = 1;
+			break;
+		case 't':
+			tabflag = 0;
+			break;
+		default:
+			linewidth = atoi(&argv[0][1]);
+			if(linewidth <= 1)
+				linewidth = WIDTH;
+			lineset = 1;
+			break;
+		}
+	}
+	if(lineset == 0){
+		getwidth();
+		if(linewidth <= 1){
+			linewidth = WIDTH;
+			font = nil;
+		}
+	}
+
+	cbuf = cbufp = malloc(ALLOC_QUANTA*(sizeof *cbuf));
+	word = malloc(WORD_ALLOC_QUANTA*(sizeof *word));
+	if(word == 0 || cbuf == 0)
+		error("out of memory");
+	if(argc == 1)
+		readbuf(0);
+	else{
+		for(i = 1; i < argc; i++){
+			if((ifd = open(*++argv, OREAD)) == -1)
+				fprint(2, "mc: can't open %s (%r)\n", *argv);
+			else{
+				readbuf(ifd);
+				Bflush(&bin);
+				close(ifd);
+			}
+		}
+	}
+	columnate();
+	exits(0);
+}
+void
+error(char *s)
+{
+	fprint(2, "mc: %s\n", s);
+	exits(s);
+}
+void
+readbuf(int fd)
+{
+	int lastwascolon = 0;
+	long c;
+	int linesiz = 0;
+
+	Binit(&bin, fd, OREAD);
+	do{
+		if(nchars++ >= nalloc)
+			morechars();
+		*cbufp++ = c = Bgetrune(&bin);
+		linesiz++;
+		if(c == '\t') {
+			cbufp[-1] = L' ';
+			while(linesiz%TAB != 0) {
+				if(nchars++ >= nalloc)
+					morechars();
+				*cbufp++ = L' ';
+				linesiz++;
+			}
+		}
+		if(colonflag && c == ':')
+			lastwascolon++;
+		else if(lastwascolon){
+			if(c == '\n'){
+				--nchars; 	/* skip newline */
+				*cbufp = L'\0';
+				while(nchars > 0 && cbuf[--nchars] != '\n')
+					;
+				if(nchars)
+					nchars++;
+				columnate();
+				if (nchars)
+					Bputc(&bout, '\n');
+				Bprint(&bout, "%S", cbuf+nchars);
+				nchars = 0;
+				cbufp = cbuf;
+			}
+			lastwascolon = 0;
+		}
+		if(c == '\n')
+			linesiz = 0;
+	}while(c >= 0);
+}
+void
+scanwords(void)
+{
+	Rune *p, *q;
+	int i, w;
+
+	nwords=0;
+	maxwidth=0;
+	for(p = q = cbuf, i = 0; i < nchars; i++){
+		if(*p++ == L'\n'){
+			if(nwords >= nwalloc){
+				nwalloc += WORD_ALLOC_QUANTA;
+				if((word = realloc(word, nwalloc*sizeof(*word)))==0)
+					error("out of memory");
+			}
+			word[nwords++] = q;
+			p[-1] = L'\0';
+			w = wordwidth(q, p-q-1);
+			if(w > maxwidth)
+				maxwidth = w;
+			q = p;
+		}
+	}
+}
+
+void
+columnate(void)
+{
+	int i, j;
+	int words_per_line;
+	int nlines;
+	int col;
+	int endcol;
+
+
+	scanwords();
+	if(nwords==0)
+		return;
+	maxwidth = nexttab(maxwidth+mintab-1);
+	words_per_line = linewidth/maxwidth;
+	if(words_per_line <= 0)
+		words_per_line = 1;
+	nlines=(nwords+words_per_line-1)/words_per_line;
+	for(i = 0; i < nlines; i++){
+		col = endcol = 0;
+		for(j = i; j < nwords; j += nlines){
+			endcol += maxwidth;
+			Bprint(&bout, "%S", word[j]);
+			col += wordwidth(word[j], runestrlen(word[j]));
+			if(j+nlines < nwords){
+				if(tabflag) {
+					while(col < endcol){
+						Bputc(&bout, '\t');
+						col = nexttab(col);
+					}
+				}else{
+					while(col < endcol){
+						Bputc(&bout, ' ');
+						col++;
+					}
+				}
+			}
+		}
+		Bputc(&bout, '\n');
+	}
+}
+
+int
+wordwidth(Rune *w, int nw)
+{
+	if(font)
+		return runestringnwidth(font, w, nw);
+	return nw;
+}
+
+int
+nexttab(int col)
+{
+	if(tabwidth){
+		col += tabwidth;
+		col -= col%tabwidth;
+		return col;
+	}
+	return col+1;
+}
+
+void
+morechars(void)
+{
+	nalloc += ALLOC_QUANTA;
+	if((cbuf = realloc(cbuf, nalloc*sizeof(*cbuf))) == 0)
+		error("out of memory");
+	cbufp = cbuf+nchars-1;
+}
+
+/*
+ * These routines discover the width of the display.
+ * It takes some work.  If we do the easy calls to the
+ * draw library, the screen flashes due to repainting
+ * when mc exits.
+ */
+
+jmp_buf	drawjmp;
+
+void
+terror(Display*, char*)
+{
+	longjmp(drawjmp, 1);
+}
+
+void
+getwidth(void)
+{
+	int n, fd;
+	char buf[128], *f[10], *p;
+
+	if(access("/dev/acme", OREAD) >= 0){
+		if((fd = open("/dev/acme/ctl", OREAD)) < 0)
+			return;
+		n = read(fd, buf, sizeof buf-1);
+		close(fd);
+		if(n <= 0)
+			return;
+		buf[n] = 0;
+		n = tokenize(buf, f, nelem(f));
+		if(n < 7)
+			return;
+		if((font = openfont(nil, f[6])) == nil)
+			return;
+		if(n >= 8)
+			tabwidth = atoi(f[7]);
+		else
+			tabwidth = 4*stringwidth(font, "0");
+		mintab = stringwidth(font, "0");
+		linewidth = atoi(f[5]);
+		tabflag = 1;
+		return;
+	}
+
+	if((p = getenv("font")) == nil)
+		return;
+	if((font = openfont(nil, p)) == nil)
+		return;
+	if((fd = open("/dev/window", OREAD)) < 0){
+		font = nil;
+		return;
+	}
+	n = read(fd, buf, 5*12);
+	close(fd);
+	if(n < 5*12){
+		font = nil;
+		return;
+	}
+	buf[n] = 0;
+	
+	/* window stucture:
+		4 bit left edge
+		1 bit gap
+		12 bit scrollbar
+		4 bit gap
+		text
+		4 bit right edge
+	*/
+	linewidth = atoi(buf+3*12) - atoi(buf+1*12) - (4+1+12+4+4);
+	mintab = stringwidth(font, "0");
+	if((p = getenv("tabstop")) != nil)
+		tabwidth = atoi(p)*stringwidth(font, "0");
+	if(tabwidth == 0)
+		tabwidth = 4*stringwidth(font, "0");
+	tabflag = 1;
+}