Warn and stop processing if the format string ends with an backslash.

From Andres Perera (andres.p at zoho.com), ok otto@, millert@

1 files changed, 6 insertions, 1 deletions

diff --git a/usr.bin/printf/printf.c b/usr.bin/printf/printf.c
index 311eaf8f906..7973018ae94 100644
--- a/usr.bin/printf/printf.c
+++ b/usr.bin/printf/printf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: printf.c,v 1.17 2009/10/27 23:59:41 deraadt Exp $	*/
+/*	$OpenBSD: printf.c,v 1.18 2011/06/18 02:36:22 guenther Exp $	*/
 
 /*
  * Copyright (c) 1989 The Regents of the University of California.
@@ -351,6 +351,11 @@ print_escape(const char *str)
 		putchar('\v');
 		break;
 
+	case '\0':
+		warnx("null escape sequence");
+		rval = 1;
+		return 0;
+
 	default:
 		putchar(*str);
 		warnx("unknown escape sequence `\\%c'", *str);