string/strrchr.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <string.h>
  20
  21 #undef strrchr
  22
  23 /* Find the last occurrence of C in S.  */
  24 char *
  25 strrchr (const char *s, int c)
  26 {
  27   register const char *found, *p;
  28
  29   c = (unsigned char) c;
  30
  31   /* Since strchr is fast, we use it rather than the obvious loop.  */
  32
  33   if (c == '\0')
  34     return strchr (s, '\0');
  35
  36   found = NULL;
  37   while ((p = strchr (s, c)) != NULL)
  38     {
  39       found = p;
  40       s = p + 1;
  41     }
  42
  43   return (char *) found;
  44 }
  45
  46 #ifdef weak_alias
  47 #undef rindex
  48 weak_alias (strrchr, rindex)
  49 #endif
  50 libc_hidden_builtin_def (strrchr)