string/strcspn.c

   1 /* Copyright (C) 1991-2015 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <string.h>
  19
  20 #undef strcspn
  21
  22 #ifndef STRCSPN
  23 # define STRCSPN strcspn
  24 #endif
  25
  26 /* Return the length of the maximum initial segment of S
  27    which contains no characters from REJECT.  */
  28 size_t
  29 STRCSPN (const char *s, const char *reject)
  30 {
  31   size_t count = 0;
  32
  33   while (*s != '\0')
  34     if (strchr (reject, *s++) == NULL)
  35       ++count;
  36     else
  37       return count;
  38
  39   return count;
  40 }
  41 libc_hidden_builtin_def (strcspn)