1/* Copyright (C) 1995-2023 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 <https://www.gnu.org/licenses/>. */
17
18#include <wchar.h>
19
20#ifdef WCSCSPN
21# define wcscspn WCSCSPN
22#endif
23
24/* Return the length of the maximum initial segment
25 of WCS which contains only wide-characters not in REJECT. */
26size_t
27wcscspn (const wchar_t *wcs, const wchar_t *reject)
28{
29 size_t count = 0;
30
31 while (*wcs != L'\0')
32 if (wcschr (reject, *wcs++) == NULL)
33 ++count;
34 else
35 return count;
36
37 return count;
38}
39