Add nsswitch support.
[dragonfly.git] / lib / libc / string / strstr.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.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)strstr.c 8.1 (Berkeley) 6/4/93
37 * $FreeBSD: src/lib/libc/string/strstr.c,v 1.1.1.1.14.1 2001/07/09 23:30:07 obrien Exp $
c01a9d5f 38 * $DragonFly: src/lib/libc/string/strstr.c,v 1.4 2005/04/28 13:25:12 joerg Exp $
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39 */
40
c01a9d5f 41#include <sys/types.h>
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42#include <string.h>
43
44/*
45 * Find the first occurrence of find in s.
46 */
47char *
c01a9d5f 48strstr(const char *s, const char *find)
984263bc 49{
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50 char c, sc;
51 size_t len;
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52
53 if ((c = *find++) != 0) {
54 len = strlen(find);
55 do {
56 do {
57 if ((sc = *s++) == 0)
58 return (NULL);
59 } while (sc != c);
60 } while (strncmp(s, find, len) != 0);
61 s--;
62 }
c01a9d5f 63 return (__DECONST(char *, s));
984263bc 64}