1/* $NetBSD: strpbrk.c,v 1.3 2024/01/20 14:55:11 christos 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: strpbrk.c,v 1.3 2024/01/20 14:55:11 christos 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#define FAST_STRPBRK 1 41#define UC(a) ((unsigned int)(unsigned char)(a)) 42 43#ifdef FAST_STRPBRK 44#define ADD_NEW_TO_SET(i) (set[inv[i] = idx++] = (i)) 45#define IS_IN_SET(i) (inv[i] < idx && set[inv[i]] == (i)) 46#define ADD_TO_SET(i) (void)(IS_IN_SET(i) || /*LINTED no effect*/ADD_NEW_TO_SET(i)) 47#else 48#define IS_IN_SET(i) (set[(i) >> 3] & idx[(i) & 7]) 49#define ADD_TO_SET(i) (void)(set[(i) >> 3] |= idx[(i) & 7]) 50#endif 51 52char * 53strpbrk(const char *s, const char *charset) 54{ 55#ifdef FAST_STRPBRK 56 uint8_t set[256], inv[256], idx = 0; 57#else 58 static const size_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 }; 59 uint8_t set[32]; 60 61 (void)memset(set, 0, sizeof(set)); 62#endif 63 64 if (charset[0] == '\0') 65 return NULL; 66 if (charset[1] == '\0') 67 return __UNCONST(strchr(s, charset[0])); 68 69 for (; *charset != '\0'; ++charset) 70 ADD_TO_SET(UC(*charset)); 71 72 for (; *s != '\0'; ++s) 73 if (IS_IN_SET(UC(*s))) 74 return __UNCONST(s); 75 return NULL; 76} 77