libhed/memrchr.c

   1 /*
   2  * memrchr - Scan memory backwards for a character
   3  * Copyright (C) 2011  Petr Tesarik <petr@tesarici.cz>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 /* memrchr(3) is available with recent versions of glibc, but it may be
  20  * missing on other platforms, so provide a replacement
  21  */
  22 static void *
  23 memrchr(const void *s, int c, size_t n)
  24 {
  25         unsigned char *p = s + n;
  26         while (p-- > s)
  27                 if (*p == (unsigned char)c)
  28                         return p;
  29         return NULL;
  30 }