compat/memrchr.cc

   1 /*
   2  * Copyright (C) 1996-2022 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 /*
  10  * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com>
  11  *
  12  * Permission to use, copy, modify, and distribute this software for any
  13  * purpose with or without fee is hereby granted, provided that the above
  14  * copyright notice and this permission notice appear in all copies.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  17  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  19  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  20  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  21  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  22  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include "squid.h"
  26
  27 #if !HAVE_MEMRCHR
  28
  29 #include "compat/memrchr.h"
  30
  31 /*
  32  * Reverse memchr()
  33  * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
  34  */
  35 void *
  36 memrchr(const void *s, int c, size_t n)
  37 {
  38     const unsigned char *cp;
  39
  40     if (n != 0) {
  41         cp = (unsigned char *)s + n;
  42         do {
  43             if (*(--cp) == (unsigned char)c)
  44                 return((void *)cp);
  45         } while (--n != 0);
  46     }
  47     return((void *)0);
  48 }
  49
  50 #endif
  51