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688903eb | 1 | /* Copyright (C) 1998-2018 Free Software Foundation, Inc. |
4bca4c17 UD |
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 | |
41bdb6e2 AJ |
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. | |
4bca4c17 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
4bca4c17 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
4bca4c17 UD |
18 | |
19 | #include <wchar.h> | |
20 | ||
fcf40ebe SL |
21 | #ifdef WCSNLEN |
22 | # define __wcsnlen WCSNLEN | |
23 | #endif | |
4bca4c17 | 24 | |
fcf40ebe | 25 | /* Return length of string S at most maxlen. */ |
4bca4c17 | 26 | size_t |
9d46370c | 27 | __wcsnlen (const wchar_t *s, size_t maxlen) |
4bca4c17 UD |
28 | { |
29 | size_t len = 0; | |
30 | ||
9cc198f6 | 31 | while (maxlen > 0 && s[len] != L'\0') |
4bca4c17 | 32 | { |
9cc198f6 UD |
33 | ++len; |
34 | if (--maxlen == 0 || s[len] == L'\0') | |
4bca4c17 | 35 | return len; |
9cc198f6 UD |
36 | ++len; |
37 | if (--maxlen == 0 || s[len] == L'\0') | |
4bca4c17 | 38 | return len; |
9cc198f6 UD |
39 | ++len; |
40 | if (--maxlen == 0 || s[len] == L'\0') | |
4bca4c17 UD |
41 | return len; |
42 | ++len; | |
0bd537d8 | 43 | --maxlen; |
4bca4c17 UD |
44 | } |
45 | ||
46 | return len; | |
47 | } | |
fcf40ebe | 48 | #ifndef WCSNLEN |
4bca4c17 | 49 | weak_alias (__wcsnlen, wcsnlen) |
fcf40ebe | 50 | #endif |