1/*	$NetBSD: wcsncmp.c,v 1.8 2009/01/11 02:46:30 christos Exp $	*/
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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)strncmp.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: wcsncmp.c,v 1.8 2009/01/11 02:46:30 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include <assert.h>
42#include <wchar.h>
43#include "runetype_local.h"
44
45int
46wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
47{
48
49	_DIAGASSERT(s1 != NULL);
50	_DIAGASSERT(s2 != NULL);
51
52	if (n == 0)
53		return (0);
54	do {
55		if (*s1 != *s2++) {
56			/* XXX assumes wchar_t = int */
57			return (*(const __nbrune_t *)s1 -
58			    *(const __nbrune_t *)--s2);
59		}
60		if (*s1++ == 0)
61			break;
62	} while (--n != 0);
63	return (0);
64}
65