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  * Squid VCS $Id$
  16  *
  17  *  Original License and code follows.
  18  */
  19
  20 #include "config.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.
  40  * 3. Neither the name of the University nor the names of its contributors
  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 {
  75     char c, sc;
  76     size_t len;
  77
  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;
  93 }
  94
  95 #endif /* !HAVE_STRNSTR */
  96 #endif /* _SQUID_COMPAT_STRNSTR_CC_ */