wcsstr.c revision 76612 
1/*	$NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $	*/
2
3/*-
4 * Copyright (c)1999 Citrus Project,
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 *	citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
29 *
30 * $FreeBSD: head/lib/libc/string/wcsstr.c 76612 2001-05-15 06:01:19Z tshiozak $
31 */
32
33#include <sys/cdefs.h>
34#if defined(LIBC_SCCS) && !defined(lint)
35__RCSID("$NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $");
36#endif /* LIBC_SCCS and not lint */
37
38#include <assert.h>
39#include <wchar.h>
40
41wchar_t *
42wcsstr(big, little)
43	const wchar_t *big;
44	const wchar_t *little;
45{
46	const wchar_t *p;
47	const wchar_t *q;
48	const wchar_t *r;
49
50	_DIAGASSERT(big != NULL);
51	_DIAGASSERT(little != NULL);
52
53	if (!*little) {
54		/* LINTED interface specification */
55		return (wchar_t *)big;
56	}
57	if (wcslen(big) < wcslen(little))
58		return NULL;
59
60	p = big;
61	q = little;
62	while (*p) {
63		q = little;
64		r = p;
65		while (*q) {
66			if (*r != *q)
67				break;
68			q++;
69			r++;
70		}
71		if (!*q) {
72			/* LINTED interface specification */
73			return (wchar_t *)p;
74		}
75		p++;
76	}
77	return NULL;
78}
79