2ca83a6a31
implementations based on the suggestions I made for DragonFly's libc ages ago. For charset with more than one entry and iterating over the first two characters of s, this is consistently faster on amd64.
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* $NetBSD: strpbrk.c,v 1.13 2008/02/22 13:32:19 joerg Exp $ */
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/*-
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* Copyright (c) 2008 Joerg Sonnenberger
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* All rights reserved.
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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(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: strpbrk.c,v 1.13 2008/02/22 13:32:19 joerg Exp $");
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#include <assert.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <string.h>
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char *
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strpbrk(const char *s, const char *charset)
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{
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static const size_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 };
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uint8_t set[32];
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_DIAGASSERT(s != NULL);
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_DIAGASSERT(charset != NULL);
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memset(set, 0, sizeof(set));
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for (; *charset != '\0'; ++charset)
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set[*charset >> 3] |= idx[*charset & 7];
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for (; *s != '\0'; ++s) {
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if (set[*s >> 3] & idx[*s & 7])
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return __UNCONST(s);
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}
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return NULL;
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}
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