lib/strcspn.c

   1 /* Copyright (C) 1991 Free Software Foundation, Inc.
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 2, or (at your option)
   6    any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, write to the Free Software Foundation,
  15    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20
  21 #ifdef HAVE_STRING_H
  22 # include <string.h>
  23 #else
  24 # include <strings.h>
  25 # ifndef strchr
  26 #  define strchr index
  27 # endif
  28 #endif
  29
  30 /* Return the length of the maximum inital segment of S
  31    which contains no characters from REJECT.  */
  32 int
  33 strcspn (s, reject)
  34      register char *s;
  35      register char *reject;
  36 {
  37   register int count = 0;
  38
  39   while (*s != '\0')
  40     if (strchr (reject, *s++) == 0)
  41       ++count;
  42     else
  43       return count;
  44
  45   return count;
  46 }