1/* $NetBSD: strcspn.c,v 1.2 2018/02/04 01:13:45 mrg Exp $ */ 2 3/*- 4 * Copyright (c) 2008 Joerg Sonnenberger 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__RCSID("$NetBSD: strcspn.c,v 1.2 2018/02/04 01:13:45 mrg Exp $"); 30 31#if !defined(_KERNEL) && !defined(_STANDALONE) 32#include <assert.h> 33#include <inttypes.h> 34#include <limits.h> 35#include <string.h> 36#else 37#include <lib/libkern/libkern.h> 38#endif 39 40/* 64bit version is in strspn.c */ 41#if ULONG_MAX != 0xffffffffffffffffull 42 43size_t 44strcspn(const char *s, const char *charset) 45{ 46 static const uint8_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 }; 47 const char *t; 48 uint8_t set[32]; 49#define UC(a) ((unsigned int)(unsigned char)(a)) 50 51 if (charset[0] == '\0') 52 return strlen(s); 53 if (charset[1] == '\0') { 54 for (t = s; *t != '\0'; ++t) 55 if (*t == *charset) 56 break; 57 return t - s; 58 } 59 60 (void)memset(set, 0, sizeof(set)); 61 62 for (; *charset != '\0'; ++charset) 63 set[UC(*charset) >> 3] |= idx[UC(*charset) & 7]; 64 65 for (t = s; *t != '\0'; ++t) 66 if (set[UC(*t) >> 3] & idx[UC(*t) & 7]) 67 break; 68 return t - s; 69} 70 71#endif 72