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62f73a711e
Now that we have an optimised memchr(3), we can use it to implement strnlen(3) with better perofrmance. Sponsored by: The FreeBSD Foundation Approved by: mjg MFC after: 1 week MFC to: stable/14 Differential Revision: https://reviews.freebsd.org/D41598 (cherry picked from commit 331737281c1929c29e679e48783055351ac4fbd9)
42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
/*-
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* Copyright (c) 2023 The FreeBSD Foundation
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*
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* This software was developed by Robert Clausecker <fuz@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE
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*/
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#include <sys/cdefs.h>
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#include <string.h>
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char *__memchr(const void *, int, size_t);
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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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const char *loc;
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loc = __memchr(s, '\0', maxlen);
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return (loc == NULL ? maxlen : (size_t)(loc - s));
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}
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