sysdeps/generic/strrchr.c

   1 /* Copyright (C) 1991, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <string.h>
  21
  22
  23 /* Find the last ocurrence of C in S.  */
  24 char *
  25 DEFUN(strrchr, (s, c), CONST char *s AND 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