===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/printf/printf.c,v
retrieving revision 1.18
retrieving revision 1.19
diff -u -r1.18 -r1.19
--- src/usr.bin/printf/printf.c	2011/06/18 02:36:22	1.18
+++ src/usr.bin/printf/printf.c	2013/11/20 20:46:47	1.19
@@ -1,4 +1,4 @@
-/*	$OpenBSD: printf.c,v 1.18 2011/06/18 02:36:22 guenther Exp $	*/
+/*	$OpenBSD: printf.c,v 1.19 2013/11/20 20:46:47 deraadt Exp $	*/
 
 /*
  * Copyright (c) 1989 The Regents of the University of California.
@@ -291,7 +291,7 @@
 
 	case 'x':
 		str++;
-		for (value = 0; isxdigit(*str); str++) {
+		for (value = 0; isxdigit((unsigned char)*str); str++) {
 			value <<= 4;
 			value += hextobin(*str);
 		}