compat/strnstr.cc

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