# HG changeset patch
# User Russ Cox <rsc@swtch.com>
# Date 1319561709 14400
# Node ID abff10878ce4b6583d71bf3ab8bc73da68957a57
# Parent  cc9d45154e3980ba40fb6c9e74e51d882e6f7f49
page: check for gs failure

diff -r cc9d45154e3980ba40fb6c9e74e51d882e6f7f49 -r abff10878ce4b6583d71bf3ab8bc73da68957a57 src/cmd/page/pdf.c
--- a/src/cmd/page/pdf.c	Sun Oct 23 18:47:29 2011 -0400
+++ b/src/cmd/page/pdf.c	Tue Oct 25 12:55:09 2011 -0400
@@ -103,6 +103,14 @@
 	gscmd(&pdf->gs, "(%s) (r) file { DELAYSAFER { .setsafe } if } stopped pop pdfopen begin\n", fn);
 	gscmd(&pdf->gs, "pdfpagecount PAGE==\n");
 	p = Brdline(&pdf->gs.gsrd, '\n');
+	if(p == nil) {
+		if(Blinelen(&pdf->gs.gsrd) > 0) {
+			fprint(2, "unexpected output (too long) from gs\n");
+			return nil;
+		}
+		fprint(2, "early EOF from gs - is ghostscript installed?\n");
+		return nil;
+	}
 	npage = atoi(p);
 	if(npage < 1) {
 		fprint(2, "no pages?\n");