wmemcmp.c revision 1.3 
1/*	$OpenBSD: wmemcmp.c,v 1.3 2005/08/08 05:53:01 espie Exp $	*/
2/*	$NetBSD: wmemcmp.c,v 1.3 2003/04/06 18:33:23 tshiozak Exp $	*/
3
4/*-
5 * Copyright (c)1999 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char *rcsid = "$OpenBSD: wmemcmp.c,v 1.3 2005/08/08 05:53:01 espie Exp $";
34#endif /* LIBC_SCCS and not lint */
35
36#include <wchar.h>
37#include "locale/runetype.h"
38
39int
40wmemcmp(const wchar_t *s1, const wchar_t *s2, size_t n)
41{
42	size_t i;
43
44	for (i = 0; i < n; i++) {
45		if (*s1 != *s2) {
46			/* wchar might be unsigned */
47			return *(const rune_t *)s1 >
48			       *(const rune_t *)s2 ? 1 : -1;
49		}
50		s1++;
51		s2++;
52	}
53	return 0;
54}
55