Import sources from 2011-03-30 iso image

1 files changed, 191 insertions, 0 deletions

diff --git a/sys/src/cmd/postscript/tr2post/ps_include.c b/sys/src/cmd/postscript/tr2post/ps_include.c
new file mode 100755
index 000000000..27d020a3a
--- /dev/null
+++ b/sys/src/cmd/postscript/tr2post/ps_include.c
@@ -0,0 +1,191 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <stdio.h>
+#include "../common/common.h"
+#include "ps_include.h"
+
+extern int curpostfontid;
+extern int curfontsize;
+
+typedef struct {long start, end;} Section;
+static char *buf;
+
+static
+copy(Biobufhdr *fin, Biobufhdr *fout, Section *s) {
+	int cond;
+	if (s->end <= s->start)
+		return;
+	Bseek(fin, s->start, 0);
+	while (Bseek(fin, 0L, 1) < s->end && (buf=Brdline(fin, '\n')) != NULL){
+		/*
+		 * We have to be careful here, because % can legitimately appear
+		 * in Ascii85 encodings, and must not be elided.
+		 * The goal here is to make any DSC comments impotent without
+		 * actually changing the behavior of the Postscript.
+		 * Since stripping ``comments'' breaks Ascii85, we can instead just
+		 * indent comments a space, which turns DSC comments into non-DSC comments
+		 * and has no effect on binary encodings, which are whitespace-blind.
+		 */
+		if(buf[0] == '%')
+			Bputc(fout, ' ');
+		Bwrite(fout, buf, Blinelen(fin));
+	}
+}
+
+/*
+ *
+ * Reads a PostScript file (*fin), and uses structuring comments to locate the
+ * prologue, trailer, global definitions, and the requested page. After the whole
+ * file is scanned, the  special ps_include PostScript definitions are copied to
+ * *fout, followed by the prologue, global definitions, the requested page, and
+ * the trailer. Before returning the initial environment (saved in PS_head) is
+ * restored.
+ *
+ * By default we assume the picture is 8.5 by 11 inches, but the BoundingBox
+ * comment, if found, takes precedence.
+ *
+ */
+/*	*fin, *fout;		/* input and output files */
+/*	page_no;		/* physical page number from *fin */
+/*	whiteout;		/* erase picture area */
+/*	outline;		/* draw a box around it and */
+/*	scaleboth;		/* scale both dimensions - if not zero */
+/*	cx, cy;			/* center of the picture and */
+/*	sx, sy;			/* its size - in current coordinates */
+/*	ax, ay;			/* left-right, up-down adjustment */
+/*	rot;			/* rotation - in clockwise degrees */
+
+void
+ps_include(Biobufhdr *fin, Biobufhdr *fout, int page_no, int whiteout,
+	int outline, int scaleboth, double cx, double cy, double sx, double sy,
+	double ax, double ay, double rot) {
+	char		**strp;
+	int		foundpage = 0;		/* found the page when non zero */
+	int		foundpbox = 0;		/* found the page bounding box */
+	int		nglobal = 0;		/* number of global defs so far */
+	int		maxglobal = 0;		/* and the number we've got room for */
+	Section	prolog, page, trailer;	/* prologue, page, and trailer offsets */
+	Section	*global;		/* offsets for all global definitions */
+	double	llx, lly;		/* lower left and */
+	double	urx, ury;		/* upper right corners - default coords */
+	double	w = whiteout != 0;	/* mostly for the var() macro */
+	double	o = outline != 0;
+	double	s = scaleboth != 0;
+	int		i;		/* loop index */
+
+#define has(word)	(strncmp(buf, word, strlen(word)) == 0)
+#define grab(n)		((Section *)(nglobal \
+			? realloc((char *)global, n*sizeof(Section)) \
+			: calloc(n, sizeof(Section))))
+
+	llx = lly = 0;		/* default BoundingBox - 8.5x11 inches */
+	urx = 72 * 8.5;
+	ury = 72 * 11.0;
+
+	/* section boundaries and bounding box */
+
+	prolog.start = prolog.end = 0;
+	page.start = page.end = 0;
+	trailer.start = 0;
+	Bseek(fin, 0L, 0);
+
+	while ((buf=Brdline(fin, '\n')) != NULL) {
+		buf[Blinelen(fin)-1] = '\0';
+		if (!has("%%"))
+			continue;
+		else if (has("%%Page: ")) {
+			if (!foundpage)
+				page.start = Bseek(fin, 0L, 1);
+			sscanf(buf, "%*s %*s %d", &i);
+			if (i == page_no)
+				foundpage = 1;
+			else if (foundpage && page.end <= page.start)
+				page.end = Bseek(fin, 0L, 1);
+		} else if (has("%%EndPage: ")) {
+			sscanf(buf, "%*s %*s %d", &i);
+			if (i == page_no) {
+				foundpage = 1;
+				page.end = Bseek(fin, 0L, 1);
+			}
+			if (!foundpage)
+				page.start = Bseek(fin, 0L, 1);
+		} else if (has("%%PageBoundingBox: ")) {
+			if (i == page_no) {
+				foundpbox = 1;
+				sscanf(buf, "%*s %lf %lf %lf %lf",
+						&llx, &lly, &urx, &ury);
+			}
+		} else if (has("%%BoundingBox: ")) {
+			if (!foundpbox)
+				sscanf(buf,"%*s %lf %lf %lf %lf",
+						&llx, &lly, &urx, &ury);
+		} else if (has("%%EndProlog") || has("%%EndSetup") || has("%%EndDocumentSetup"))
+			prolog.end = page.start = Bseek(fin, 0L, 1);
+		else if (has("%%Trailer"))
+			trailer.start = Bseek(fin, 0L, 1);
+		else if (has("%%BeginGlobal")) {
+			if (page.end <= page.start) {
+				if (nglobal >= maxglobal) {
+					maxglobal += 20;
+					global = grab(maxglobal);
+				}
+				global[nglobal].start = Bseek(fin, 0L, 1);
+			}
+		} else if (has("%%EndGlobal"))
+			if (page.end <= page.start)
+				global[nglobal++].end = Bseek(fin, 0L, 1);
+	}
+	Bseek(fin, 0L, 2);
+	if (trailer.start == 0)
+		trailer.start = Bseek(fin, 0L, 1);
+	trailer.end = Bseek(fin, 0L, 1);
+
+	if (page.end <= page.start)
+		page.end = trailer.start;
+
+/*
+fprint(2, "prolog=(%d,%d)\n", prolog.start, prolog.end);
+fprint(2, "page=(%d,%d)\n", page.start, page.end);
+for(i = 0; i < nglobal; i++)
+	fprint(2, "global[%d]=(%d,%d)\n", i, global[i].start, global[i].end);
+fprint(2, "trailer=(%d,%d)\n", trailer.start, trailer.end);
+*/
+
+	/* all output here */
+	for (strp = PS_head; *strp != NULL; strp++)
+		Bwrite(fout, *strp, strlen(*strp));
+
+	Bprint(fout, "/llx %g def\n", llx);
+	Bprint(fout, "/lly %g def\n", lly);
+	Bprint(fout, "/urx %g def\n", urx);
+	Bprint(fout, "/ury %g def\n", ury);
+	Bprint(fout, "/w %g def\n", w);
+	Bprint(fout, "/o %g def\n", o);
+	Bprint(fout, "/s %g def\n", s);
+	Bprint(fout, "/cx %g def\n", cx);
+	Bprint(fout, "/cy %g def\n", cy);
+	Bprint(fout, "/sx %g def\n", sx);
+	Bprint(fout, "/sy %g def\n", sy);
+	Bprint(fout, "/ax %g def\n", ax);
+	Bprint(fout, "/ay %g def\n", ay);
+	Bprint(fout, "/rot %g def\n", rot);
+
+	for (strp = PS_setup; *strp != NULL; strp++)
+		Bwrite(fout, *strp, strlen(*strp));
+
+	copy(fin, fout, &prolog);
+	for(i = 0; i < nglobal; i++)
+		copy(fin, fout, &global[i]);
+	copy(fin, fout, &page);
+	copy(fin, fout, &trailer);
+	for (strp = PS_tail; *strp != NULL; strp++)
+		Bwrite(fout, *strp, strlen(*strp));
+
+	if(nglobal)
+		free(global);
+
+	/* force the program to reestablish its state */
+	curpostfontid = -1;
+	curfontsize = -1;
+}