sysdeps/generic/strcspn.c

   1 /* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
   2
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <string.h>
  21
  22 /* Return the length of the maximum inital segment of S
  23    which contains no characters from REJECT.  */
  24 size_t
  25 strcspn (s, reject)
  26      register const char *s;
  27      register const char *reject;
  28 {
  29   register size_t count = 0;
  30
  31   while (*s != '\0')
  32     if (strchr (reject, *s++) == NULL)
  33       ++count;
  34     else
  35       return count;
  36
  37   return count;
  38 }