strcspn.c revision 9663:ace9a2ac3683 
1/* Copyright (C) 1991, 1994, 1996-1997, 2002-2003, 2005-2006 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 Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20#include <config.h>
21
22#include <stddef.h>
23#include <string.h>
24
25#undef strcspn
26
27/* Return the length of the maximum initial segment of S
28   which contains no characters from REJECT.  */
29size_t
30strcspn (const char *s, const char *reject)
31{
32  size_t count = 0;
33
34  while (*s != '\0')
35    if (strchr (reject, *s++) == NULL)
36      ++count;
37    else
38      return count;
39
40  return count;
41}
42