ref: 6455a4bffb866a47732b574d1f2fd105f8b03544
parent: d77b454b4a356db81c8db7d0f74e5dc13dc46707
author: giles <giles@ded80894-8fb9-0310-811b-c03f3676ab4d>
date: Mon Aug 5 13:10:44 EDT 2002
Add a memcmp() implementation, pulled in by autoconf if it's not available or the system version is broken. Don't know where the header's supposed to come from, since it defines no symbol for conditionalizing a prototype. git-svn-id: http://svn.ghostscript.com/jbig2dec/trunk@157 ded80894-8fb9-0310-811b-c03f3676ab4d
--- /dev/null
+++ b/memcmp.c
@@ -1,0 +1,44 @@
+/*
+ jbig2dec
+
+ Copyright (C) 2001-2002 artofcode LLC.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ $Id: memcmp.c,v 1.1 2002/08/05 17:10:44 giles Exp $
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stddef.h>
+
+/* replacement for broken memcmp() */
+
+/*
+ * compares two byte strings 'a' and 'b', both assumed to be 'len' bytes long
+ * returns zero if the two strings are identical, otherwise returns the difference
+ * between the values of the first two differing bytes, considered as unsigned chars
+ */
+
+int memcmp(const void *b1, const void *b2, size_t len)
+{+ unsigned char *a, *b;
+ unsigned char c;
+ size_t i;
+
+ a = (unsigned char *)b1;
+ b = (unsigned char *)b2;
+ for(i = 0; i < len; i++) {+ c = *a - *b;
+ if (c) return (int)c; /* strings differ */
+ a++;
+ b++;
+ }
+
+ return 0; /* strings match */
+}