| 1 | /* Find the length of STRING, but scan at most MAXLEN characters. |
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| 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public License as |
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| 6 | published by the Free Software Foundation; either version 2.1 of the |
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| 7 | License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; see the file COPYING.LIB. If |
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| 16 | not, see <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <string.h> |
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| 19 | |
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| 20 | /* Find the length of S, but scan at most MAXLEN characters. If no |
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| 21 | '\0' terminator is found in that many characters, return MAXLEN. */ |
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| 22 | |
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| 23 | #ifdef STRNLEN |
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| 24 | # define __strnlen STRNLEN |
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| 25 | #endif |
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| 26 | |
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| 27 | size_t |
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| 28 | __strnlen (const char *str, size_t maxlen) |
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| 29 | { |
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| 30 | const char *found = memchr (str, '\0', maxlen); |
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| 31 | return found ? found - str : maxlen; |
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| 32 | } |
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| 33 | |
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| 34 | #ifndef STRNLEN |
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| 35 | weak_alias (__strnlen, strnlen) |
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| 36 | libc_hidden_def (__strnlen) |
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| 37 | libc_hidden_def (strnlen) |
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| 38 | #endif |
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| 39 | |
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