libc/string/memrchr.c

   1 /*
   2  * Copyright (C) 2002     Manuel Novoa III
   3  * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include "_string.h"
   9
  10 #ifdef __USE_GNU
  11 void *memrchr(const void *s, int c, size_t n)
  12 {
  13         register const unsigned char *r;
  14
  15         r = ((unsigned char *)s) + ((size_t) n);
  16
  17         while (n) {
  18                 if (*--r == ((unsigned char)c)) {
  19                         return (void *) r;      /* silence the warning */
  20                 }
  21                 --n;
  22         }
  23
  24         return NULL;
  25 }
  26
  27 libc_hidden_def(memrchr)
  28 #endif