Sync lib/libc/string with FreeBSD:
[dragonfly.git] / lib / libc / string / wcsstr.c
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1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
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.
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16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
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31 *
32 * @(#)strstr.c 8.1 (Berkeley) 6/4/93
716024cd 33 * $FreeBSD: src/lib/libc/string/wcsstr.c,v 1.9 2007/01/09 00:28:12 imp Exp $
c01a9d5f 34 * $DragonFly: src/lib/libc/string/wcsstr.c,v 1.3 2005/04/28 13:25:12 joerg Exp $
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35 */
36
c01a9d5f 37#include <sys/types.h>
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38#include <wchar.h>
39
40/*
41 * Find the first occurrence of find in s.
42 */
43wchar_t *
716024cd 44wcsstr(const wchar_t * __restrict s, const wchar_t * __restrict find)
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45{
46 wchar_t c, sc;
47 size_t len;
48
49 if ((c = *find++) != 0) {
50 len = wcslen(find);
51 do {
52 do {
53 if ((sc = *s++) == L'\0')
54 return (NULL);
55 } while (sc != c);
56 } while (wcsncmp(s, find, len) != 0);
57 s--;
58 }
c01a9d5f 59 return (__DECONST(wchar_t *, s));
984263bc 60}