71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/* $NetBSD: strcspn.c,v 1.17 2009/07/30 21:42:06 dsl 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: strcspn.c,v 1.17 2009/07/30 21:42:06 dsl 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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/* 64bit version is in strspn.c */
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#if ULONG_MAX != 0xffffffffffffffffull
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size_t
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strcspn(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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const char *t;
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uint8_t set[32];
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#define UC(a) ((unsigned int)(unsigned char)(a))
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_DIAGASSERT(s != NULL);
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_DIAGASSERT(charset != NULL);
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if (charset[0] == '\0')
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return strlen(s);
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if (charset[1] == '\0') {
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for (t = s; *t != '\0'; ++t)
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if (*t == *charset)
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break;
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return t - s;
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}
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(void)memset(set, 0, sizeof(set));
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for (; *charset != '\0'; ++charset)
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set[UC(*charset) >> 3] |= idx[UC(*charset) & 7];
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for (t = s; *t != '\0'; ++t)
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if (set[UC(*t) >> 3] & idx[UC(*t) & 7])
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break;
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return t - s;
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}
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#endif
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