1 files changed, 107 insertions, 0 deletions
diff --git a/src/cmd/page/filter.c b/src/cmd/page/filter.c
new file mode 100644
index 00000000..07c3df2b
--- /dev/null
+++ b/src/cmd/page/filter.c
@@ -0,0 +1,107 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <bio.h>
+#include "page.h"
+
+Document*
+initfilt(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf, char *type, char *cmd, int docopy)
+{
+	int ofd;
+	int p[2];
+	char xbuf[8192];
+	int n;
+
+	if(argc > 1) {
+		fprint(2, "can only view one %s file at a time\n", type);
+		return nil;
+	}
+
+	fprint(2, "converting from %s to postscript...\n", type);
+
+	if(docopy){
+		if(pipe(p) < 0){
+			fprint(2, "pipe fails: %r\n");
+			exits("Epipe");
+		}
+	}else{
+		p[0] = open("/dev/null", ORDWR);
+		p[1] = open("/dev/null", ORDWR);
+	}
+
+	ofd = opentemp("/tmp/pagecvtXXXXXXXXX");
+	switch(fork()){
+	case -1:
+		fprint(2, "fork fails: %r\n");
+		exits("Efork");
+	default:
+		close(p[1]);
+		if(docopy){
+			write(p[0], buf, nbuf);
+			if(b)
+				while((n = Bread(b, xbuf, sizeof xbuf)) > 0)
+					write(p[0], xbuf, n);
+			else
+				while((n = read(stdinfd, xbuf, sizeof xbuf)) > 0)
+					write(p[0], xbuf, n);
+		}
+		close(p[0]);
+		waitpid();
+		break;
+	case 0:
+		close(p[0]);
+		dup(p[1], 0);
+		dup(ofd, 1);
+		/* stderr shines through */
+		execl("/bin/rc", "rc", "-c", cmd, nil);
+		break;
+	}
+
+	if(b)
+		Bterm(b);
+	seek(ofd, 0, 0);
+	b = emalloc(sizeof(Biobuf));
+	Binit(b, ofd, OREAD);
+
+	return initps(b, argc, argv, nil, 0);
+}
+
+Document*
+initdvi(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
+{
+	int fd;
+	char *name;
+	char cmd[256];
+	char fdbuf[20];
+
+	/*
+	 * Stupid DVIPS won't take standard input.
+	 */
+	if(b == nil){	/* standard input; spool to disk (ouch) */
+		fd = spooltodisk(buf, nbuf, &name);
+		sprint(fdbuf, "/fd/%d", fd);
+		b = Bopen(fdbuf, OREAD);
+		if(b == nil){
+			fprint(2, "cannot open disk spool file\n");
+			wexits("Bopen temp");
+		}
+		argv = &name;
+		argc = 1;
+	}
+
+	snprint(cmd, sizeof cmd, "dvips -Pps -r0 -q1 -f1 '%s'", argv[0]);
+	return initfilt(b, argc, argv, buf, nbuf, "dvi", cmd, 0);
+}
+
+Document*
+inittroff(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
+{
+	return initfilt(b, argc, argv, buf, nbuf, "troff", "lp -dstdout", 1);
+}
+
+Document*
+initmsdoc(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
+{
+	return initfilt(b, argc, argv, buf, nbuf, "microsoft office", "doc2ps", 1);
+}