lib/strcspn.c

   1 /* Copyright (C) 1991 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 char *index ();
  20
  21 /* Return the length of the maximum inital segment of S
  22    which contains no characters from REJECT.  */
  23 int
  24 strcspn (s, reject)
  25      register char *s;
  26      register char *reject;
  27 {
  28   register int count = 0;
  29
  30   while (*s != '\0')
  31     if (index (reject, *s++) == 0)
  32       ++count;
  33     else
  34       return count;
  35
  36   return count;
  37 }