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1 | #ifndef _SQUID_COMPAT_STRNSTR_C_ |
2 | #define _SQUID_COMPAT_STRNSTR_C_ | |
3 | /* | |
4 | * Shamelessly duplicated from the FreeBSD public sources | |
5 | * for use by the Squid Project under GNU Public License. | |
6 | * | |
7 | * Update/Maintenance History: | |
8 | * | |
9 | * 26-Apr-2008 : Copied from FreeBSD via OpenGrok | |
10 | * - added protection around libray headers | |
11 | * - added squid_ prefix for uniqueness | |
12 | * so we can use it where OS copy is broken. | |
13 | * | |
14 | * Squid VCS $Id$ | |
15 | * | |
16 | * Original License and code follows. | |
17 | */ | |
18 | ||
19 | #include "config.h" | |
20 | #include "strnstr.h" | |
21 | ||
22 | #if !HAVE_STRNSTR | |
23 | ||
24 | /*- | |
25 | * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org> | |
26 | * Copyright (c) 1990, 1993 | |
27 | * The Regents of the University of California. All rights reserved. | |
28 | * | |
29 | * This code is derived from software contributed to Berkeley by | |
30 | * Chris Torek. | |
31 | * | |
32 | * Redistribution and use in source and binary forms, with or without | |
33 | * modification, are permitted provided that the following conditions | |
34 | * are met: | |
35 | * 1. Redistributions of source code must retain the above copyright | |
36 | * notice, this list of conditions and the following disclaimer. | |
37 | * 2. Redistributions in binary form must reproduce the above copyright | |
38 | * notice, this list of conditions and the following disclaimer in the | |
39 | * documentation and/or other materials provided with the distribution. | |
5bb10e0a | 40 | * 3. Neither the name of the University nor the names of its contributors |
cee08cbc AJ |
41 | * may be used to endorse or promote products derived from this software |
42 | * without specific prior written permission. | |
43 | * | |
44 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
45 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
46 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
47 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
48 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
49 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
50 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
51 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
52 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
53 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
54 | * SUCH DAMAGE. | |
55 | * | |
56 | * @(#)strstr.c 8.1 (Berkeley) 6/4/93 | |
57 | * $FreeBSD: src/lib/libc/string/strnstr.c,v 1.2.2.1 2001/12/09 06:50:03 mike Exp $ | |
58 | * $DragonFly: src/lib/libc/string/strnstr.c,v 1.4 2006/03/20 17:24:20 dillon Exp $ | |
59 | */ | |
60 | ||
61 | #if HAVE_SYS_TYPES_H | |
62 | #include <sys/types.h> | |
63 | #endif | |
64 | #if HAVE_STRING_H | |
65 | #include <string.h> | |
66 | #endif | |
67 | ||
68 | /* | |
69 | * Find the first occurrence of find in s, where the search is limited to the | |
70 | * first slen characters of s. | |
71 | */ | |
72 | const char * | |
73 | squid_strnstr(const char *s, const char *find, size_t slen) | |
74 | { | |
26ac0430 AJ |
75 | char c, sc; |
76 | size_t len; | |
cee08cbc | 77 | |
26ac0430 AJ |
78 | if ((c = *find++) != '\0') { |
79 | len = strlen(find); | |
80 | do { | |
81 | do { | |
82 | if (slen < 1 || (sc = *s) == '\0') | |
83 | return (NULL); | |
84 | --slen; | |
85 | ++s; | |
86 | } while (sc != c); | |
87 | if (len > slen) | |
88 | return (NULL); | |
89 | } while (strncmp(s, find, len) != 0); | |
90 | s--; | |
91 | } | |
92 | return s; | |
cee08cbc AJ |
93 | } |
94 | ||
95 | #endif /* !HAVE_STRNSTR */ | |
96 | #endif /* _SQUID_COMPAT_STRNSTR_C_ */ |