1 /* Copyright (C) 1991, 1994, 1996-1997, 2002-2003, 2005-2006, 2009-2020 Free
2 * Software Foundation, Inc.
3
4 NOTE: The canonical source of this file is maintained with the GNU C Library.
5 Bugs can be reported to bug-glibc@gnu.org.
6
7 This program is free software: you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or any
10 later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <https://www.gnu.org/licenses/>. */
19
20 #include <config.h>
21
22 #include <stddef.h>
23 #include <string.h>
24
25 #if _LIBC
26 # undef strcspn
27 #endif
28
29 /* Return the length of the maximum initial segment of S
30 which contains no characters from REJECT. */
31 size_t
strcspn(const char * s,const char * reject)32 strcspn (const char *s, const char *reject)
33 {
34 size_t count = 0;
35
36 while (*s != '\0')
37 if (strchr (reject, *s++) == NULL)
38 ++count;
39 else
40 return count;
41
42 return count;
43 }
44