string/strcspn.c

   1 /* Copyright (C) 1991, 1994, 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 #if HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #if defined _LIBC || HAVE_STRING_H
  24 # include <string.h>
  25 #else
  26 # include <strings.h>
  27 # ifndef strchr
  28 #  define strchr index
  29 # endif
  30 #endif
  31
  32 #undef strcspn
  33
  34 /* Return the length of the maximum initial segment of S
  35    which contains no characters from REJECT.  */
  36 size_t
  37 strcspn (s, reject)
  38      const char *s;
  39      const char *reject;
  40 {
  41   size_t count = 0;
  42
  43   while (*s != '\0')
  44     if (strchr (reject, *s++) == NULL)
  45       ++count;
  46     else
  47       return count;
  48
  49   return count;
  50 }
  51 libc_hidden_builtin_def (strcspn)