sysdeps/generic/strcspn.c

   1 /* Copyright (C) 1991, 1994, 1996, 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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 /* Return the length of the maximum initial segment of S
  33    which contains no characters from REJECT.  */
  34 size_t
  35 strcspn (s, reject)
  36      const char *s;
  37      const char *reject;
  38 {
  39   size_t count = 0;
  40
  41   while (*s != '\0')
  42     if (strchr (reject, *s++) == NULL)
  43       ++count;
  44     else
  45       return count;
  46
  47   return count;
  48 }