1 /** $MirOS: src/lib/libc/string/wcsncmp.c,v 1.2 2005/09/22 20:53:00 tg Exp $ */
2 /* $OpenBSD: wcsncmp.c,v 1.4 2005/08/08 08:05:37 espie Exp $ */
3 /* $NetBSD: wcsncmp.c,v 1.5 2003/08/07 16:43:54 agc Exp $ */
4
5 /*
6 * Copyright (c) 1989, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <wchar.h>
35
36 int
wcsncmp(const wchar_t * s1,const wchar_t * s2,size_t n)37 wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
38 {
39
40 if (n == 0)
41 return (0);
42 do {
43 if (*s1 != *s2++) {
44 return (*(const wchar_t *)s1 -
45 *(const wchar_t *)--s2);
46 }
47 if (*s1++ == 0)
48 break;
49 } while (--n != 0);
50 return (0);
51 }
52