wcsncmp.c revision 76612 
1/*	$NetBSD$	*/
2
3/*
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: head/lib/libc/string/wcsncmp.c 76612 2001-05-15 06:01:19Z tshiozak $
36 */
37
38#include <sys/cdefs.h>
39#if defined(LIBC_SCCS) && !defined(lint)
40#if 0
41static char sccsid[] = "@(#)strncmp.c	8.1 (Berkeley) 6/4/93";
42#else
43__RCSID("$NetBSD$");
44#endif
45#endif /* LIBC_SCCS and not lint */
46
47#include <assert.h>
48#include <wchar.h>
49
50int
51wcsncmp(s1, s2, n)
52	const wchar_t *s1, *s2;
53	size_t n;
54{
55
56	_DIAGASSERT(s1 != NULL);
57	_DIAGASSERT(s2 != NULL);
58
59	if (n == 0)
60		return (0);
61	do {
62		if (*s1 != *s2++) {
63			/* XXX assumes wchar_t = int */
64			return (*(const unsigned int *)s1 -
65			    *(const unsigned int *)--s2);
66		}
67		if (*s1++ == 0)
68			break;
69	} while (--n != 0);
70	return (0);
71}
72