1/* Copyright (C) 1998-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <wchar.h>
20
21#ifdef WCSNLEN
22# define __wcsnlen WCSNLEN
23#endif
24
25/* Return length of string S at most maxlen. */
26size_t
27__wcsnlen (const wchar_t *s, size_t maxlen)
28{
29 size_t len = 0;
30
31 while (maxlen > 0 && s[len] != L'\0')
32 {
33 ++len;
34 if (--maxlen == 0 || s[len] == L'\0')
35 return len;
36 ++len;
37 if (--maxlen == 0 || s[len] == L'\0')
38 return len;
39 ++len;
40 if (--maxlen == 0 || s[len] == L'\0')
41 return len;
42 ++len;
43 --maxlen;
44 }
45
46 return len;
47}
48#ifndef WCSNLEN
49weak_alias (__wcsnlen, wcsnlen)
50#endif
51