ref: a9edf8c0252898ffb46431e8b5f7bc79d19634f6
dir: /memcmp.c/
/*
jbig2dec
Copyright (C) 2001-2002 artofcode LLC.
This software is distributed under license and may not
be copied, modified or distributed except as expressly
authorized under the terms of the license contained in
the file LICENSE in this distribution.
For information on commercial licensing, go to
http://www.artifex.com/licensing/ or contact
Artifex Software, Inc., 101 Lucas Valley Road #110,
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
$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 */
}