Add nsswitch support.
[dragonfly.git] / lib / libc / string / strcasestr.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 * $FreeBSD: src/lib/libc/string/strcasestr.c,v 1.2.2.1 2001/12/25 00:36:53 ache Exp $
bd4c62e8 37 * $DragonFly: src/lib/libc/string/strcasestr.c,v 1.4 2005/09/18 16:32:34 asmodai Exp $
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38 */
39
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40#include <ctype.h>
41#include <string.h>
42
43/*
44 * Find the first occurrence of find in s, ignore case.
45 */
46char *
bd4c62e8 47strcasestr(const char *s, const char *find)
984263bc 48{
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49 char c, sc;
50 size_t len;
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51
52 if ((c = *find++) != 0) {
53 c = tolower((unsigned char)c);
54 len = strlen(find);
55 do {
56 do {
57 if ((sc = *s++) == 0)
58 return (NULL);
59 } while ((char)tolower((unsigned char)sc) != c);
60 } while (strncasecmp(s, find, len) != 0);
61 s--;
62 }
63 return ((char *)s);
64}