source: squid-ssl/trunk/fuentes/compat/strnstr.cc @ 5495

Last change on this file since 5495 was 5495, checked in by Juanma, 2 years ago

Initial release

File size: 3.4 KB
Line 
1/*
2 * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9#ifndef SQUID_COMPAT_STRNSTR_CC_
10#define SQUID_COMPAT_STRNSTR_CC_
11
12/*
13 *  Shamelessly duplicated from the FreeBSD public sources
14 *  for use by the Squid Project under GNU Public License.
15 *
16 * Update/Maintenance History:
17 *
18 *    26-Apr-2008 : Copied from FreeBSD via OpenGrok
19 *          - added protection around libray headers
20 *          - added squid_ prefix for uniqueness
21 *            so we can use it where OS copy is broken.
22 *
23 *  Original License and code follows.
24 */
25
26#include "squid.h"
27
28#if !HAVE_STRNSTR
29
30/*-
31 * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
32 * Copyright (c) 1990, 1993
33 *  The Regents of the University of California.  All rights reserved.
34 *
35 * This code is derived from software contributed to Berkeley by
36 * Chris Torek.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 *    notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 *    notice, this list of conditions and the following disclaimer in the
45 *    documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 *    may be used to endorse or promote products derived from this software
48 *    without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)strstr.c 8.1 (Berkeley) 6/4/93
63 * $FreeBSD: src/lib/libc/string/strnstr.c,v 1.2.2.1 2001/12/09 06:50:03 mike Exp $
64 * $DragonFly: src/lib/libc/string/strnstr.c,v 1.4 2006/03/20 17:24:20 dillon Exp $
65 */
66
67#if HAVE_SYS_TYPES_H
68#include <sys/types.h>
69#endif
70#include <cstring>
71
72/**
73 * Find the first occurrence of find in s, where the search is limited to the
74 * first slen characters of s.
75 */
76const char *
77squid_strnstr(const char *s, const char *find, size_t slen)
78{
79    char c, sc;
80    size_t len;
81
82    if ((c = *find++) != '\0') {
83        len = strlen(find);
84        do {
85            do {
86                if (slen < 1 || (sc = *s) == '\0')
87                    return (NULL);
88                --slen;
89                ++s;
90            } while (sc != c);
91            if (len > slen)
92                return (NULL);
93        } while (strncmp(s, find, len) != 0);
94        --s;
95    }
96    return s;
97}
98
99#endif /* !HAVE_STRNSTR */
100#endif /* SQUID_COMPAT_STRNSTR_CC_ */
101
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