/* $NetBSD: strcspn.c,v 1.2 2018/02/04 01:13:45 mrg Exp $ */
/*-
* Copyright (c) 2008 Joerg Sonnenberger
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: strcspn.c,v 1.2 2018/02/04 01:13:45 mrg Exp $");
#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <assert.h>
#include <inttypes.h>
#include <limits.h>
#include <string.h>
#else
#include <lib/libkern/libkern.h>
#endif
/* 64bit version is in strspn.c */
#if ULONG_MAX != 0xffffffffffffffffull
size_t
strcspn(const char *s, const char *charset)
{
static const uint8_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 };
const char *t;
uint8_t set[32];
#define UC(a) ((unsigned int)(unsigned char)(a))
if (charset[0] == '\0')
return strlen(s);
if (charset[1] == '\0') {
for (t = s; *t != '\0'; ++t)
if (*t == *charset)
break;
return t - s;
}
(void)memset(set, 0, sizeof(set));
for (; *charset != '\0'; ++charset)
set[UC(*charset) >> 3] |= idx[UC(*charset) & 7];
for (t = s; *t != '\0'; ++t)
if (set[UC(*t) >> 3] & idx[UC(*t) & 7])
break;
return t - s;
}
#endif
