lib/strcspn.c

   1 /* Copyright (C) 1991, 1994, 1996-1997, 2002 Free Software Foundation, Inc.
   2
   3    NOTE: The canonical source of this file is maintained with the GNU C Library.
   4    Bugs can be reported to bug-glibc@gnu.org.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19    USA.  */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <stddef.h>
  26
  27 #if defined _LIBC || HAVE_STRING_H
  28 # include <string.h>
  29 #else
  30 # include <strings.h>
  31 # ifndef strchr
  32 #  define strchr index
  33 # endif
  34 #endif
  35
  36 #undef strcspn
  37
  38 /* Return the length of the maximum initial segment of S
  39    which contains no characters from REJECT.  */
  40 size_t
  41 strcspn (const char *s, const char *reject)
  42 {
  43   size_t count = 0;
  44
  45   while (*s != '\0')
  46     if (strchr (reject, *s++) == NULL)
  47       ++count;
  48     else
  49       return count;
  50
  51   return count;
  52 }