1 | /* Find the length of STRING, but scan at most MAXLEN characters. |
2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
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 License as |
6 | published by the Free Software Foundation; either version 2.1 of the |
7 | 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; see the file COPYING.LIB. If |
16 | not, see <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <string.h> |
19 | |
20 | /* Find the length of S, but scan at most MAXLEN characters. If no |
21 | '\0' terminator is found in that many characters, return MAXLEN. */ |
22 | |
23 | #ifdef STRNLEN |
24 | # define __strnlen STRNLEN |
25 | #endif |
26 | |
27 | size_t |
28 | __strnlen (const char *str, size_t maxlen) |
29 | { |
30 | const char *found = memchr (str, '\0', maxlen); |
31 | return found ? found - str : maxlen; |
32 | } |
33 | |
34 | #ifndef STRNLEN |
35 | weak_alias (__strnlen, strnlen) |
36 | libc_hidden_def (__strnlen) |
37 | libc_hidden_def (strnlen) |
38 | #endif |
39 | |