Annotation of mandoc/compat_strcasestr.c, Revision 1.5
1.5 ! schwarze 1: /* $Id: compat_strcasestr.c,v 1.4 2014/12/11 09:19:32 schwarze Exp $ */
1.4 schwarze 2: /* $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $ */
1.1 schwarze 3:
4: /*-
5: * Copyright (c) 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Chris Torek.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
1.5 ! schwarze 35: #include "config.h"
1.1 schwarze 36:
37: #include <sys/types.h>
38: #include <ctype.h>
39: #include <string.h>
40:
41: #define __UNCONST(a) ((void *)(unsigned long)(const void *)(a))
42:
43: /*
44: * Find the first occurrence of find in s, ignore case.
45: */
46: char *
47: strcasestr(const char *s, const char *find)
48: {
49: char c, sc;
50: size_t len;
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 __UNCONST(s);
64: }
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