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35 lines
1.3 KiB
C
35 lines
1.3 KiB
C
/* Find the length of STRING, but scan at most MAXLEN characters.
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Copyright (C) 2005-2007, 2009-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <string.h>
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/* Find the length of S, but scan at most MAXLEN bytes.
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S must be a string if it starts with fewer than MAXLEN initialized bytes.
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If no '\0' terminator is found in that many bytes, return MAXLEN. */
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size_t
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strnlen (const char *s, size_t maxlen)
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{
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/* Do not use memchr, because on some platforms memchr has
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undefined behavior if MAXLEN exceeds the number of bytes in S. */
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size_t i;
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for (i = 0; i < maxlen && s[i]; i++)
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continue;
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return i;
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}
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