1 |
|
|
/* $OpenBSD: strcasestr.c,v 1.4 2015/08/31 02:53:57 guenther Exp $ */ |
2 |
|
|
/* $NetBSD: strcasestr.c,v 1.2 2005/02/09 21:35:47 kleink Exp $ */ |
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 |
|
|
*/ |
35 |
|
|
|
36 |
|
|
#include <ctype.h> |
37 |
|
|
#include <string.h> |
38 |
|
|
|
39 |
|
|
/* |
40 |
|
|
* Find the first occurrence of find in s, ignore case. |
41 |
|
|
*/ |
42 |
|
|
char * |
43 |
|
|
strcasestr(const char *s, const char *find) |
44 |
|
|
{ |
45 |
|
|
char c, sc; |
46 |
|
|
size_t len; |
47 |
|
|
|
48 |
|
|
if ((c = *find++) != 0) { |
49 |
|
|
c = (char)tolower((unsigned char)c); |
50 |
|
|
len = strlen(find); |
51 |
|
|
do { |
52 |
|
|
do { |
53 |
|
|
if ((sc = *s++) == 0) |
54 |
|
|
return (NULL); |
55 |
|
|
} while ((char)tolower((unsigned char)sc) != c); |
56 |
|
|
} while (strncasecmp(s, find, len) != 0); |
57 |
|
|
s--; |
58 |
|
|
} |
59 |
|
|
return ((char *)s); |
60 |
|
|
} |
61 |
|
|
DEF_WEAK(strcasestr); |