sysdeps/generic/strcspn.c

   1 /* Copyright (C) 1991, 1994, 1996 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 #include <string.h>
  20
  21 /* Return the length of the maximum initial segment of S
  22    which contains no characters from REJECT.  */
  23 size_t
  24 strcspn (s, reject)
  25      register const char *s;
  26      register const char *reject;
  27 {
  28   register size_t count = 0;
  29
  30   while (*s != '\0')
  31     if (strchr (reject, *s++) == NULL)
  32       ++count;
  33     else
  34       return count;
  35
  36   return count;
  37 }