1*4a5d661aSToomas Soome /*- 2*4a5d661aSToomas Soome * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> 3*4a5d661aSToomas Soome * All rights reserved. 4*4a5d661aSToomas Soome * 5*4a5d661aSToomas Soome * Redistribution and use in source and binary forms, with or without 6*4a5d661aSToomas Soome * modification, are permitted provided that the following conditions 7*4a5d661aSToomas Soome * are met: 8*4a5d661aSToomas Soome * 1. Redistributions of source code must retain the above copyright 9*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer. 10*4a5d661aSToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 11*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer in the 12*4a5d661aSToomas Soome * documentation and/or other materials provided with the distribution. 13*4a5d661aSToomas Soome * 14*4a5d661aSToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15*4a5d661aSToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16*4a5d661aSToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17*4a5d661aSToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18*4a5d661aSToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19*4a5d661aSToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20*4a5d661aSToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21*4a5d661aSToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22*4a5d661aSToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23*4a5d661aSToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24*4a5d661aSToomas Soome * SUCH DAMAGE. 25*4a5d661aSToomas Soome */ 26*4a5d661aSToomas Soome 27*4a5d661aSToomas Soome #include <sys/cdefs.h> 28*4a5d661aSToomas Soome __FBSDID("$FreeBSD$"); 29*4a5d661aSToomas Soome 30*4a5d661aSToomas Soome #include <sys/types.h> 31*4a5d661aSToomas Soome #include <limits.h> 32*4a5d661aSToomas Soome #include <string.h> 33*4a5d661aSToomas Soome 34*4a5d661aSToomas Soome #define IDX(c) ((u_char)(c) / LONG_BIT) 35*4a5d661aSToomas Soome #define BIT(c) ((u_long)1 << ((u_char)(c) % LONG_BIT)) 36*4a5d661aSToomas Soome 37*4a5d661aSToomas Soome size_t 38*4a5d661aSToomas Soome strspn(const char *s, const char *charset) 39*4a5d661aSToomas Soome { 40*4a5d661aSToomas Soome /* 41*4a5d661aSToomas Soome * NB: idx and bit are temporaries whose use causes gcc 3.4.2 to 42*4a5d661aSToomas Soome * generate better code. Without them, gcc gets a little confused. 43*4a5d661aSToomas Soome */ 44*4a5d661aSToomas Soome const char *s1; 45*4a5d661aSToomas Soome u_long bit; 46*4a5d661aSToomas Soome u_long tbl[(UCHAR_MAX + 1) / LONG_BIT]; 47*4a5d661aSToomas Soome int idx; 48*4a5d661aSToomas Soome 49*4a5d661aSToomas Soome if(*s == '\0') 50*4a5d661aSToomas Soome return (0); 51*4a5d661aSToomas Soome 52*4a5d661aSToomas Soome #if LONG_BIT == 64 /* always better to unroll on 64-bit architectures */ 53*4a5d661aSToomas Soome tbl[3] = tbl[2] = tbl[1] = tbl[0] = 0; 54*4a5d661aSToomas Soome #else 55*4a5d661aSToomas Soome for (idx = 0; idx < sizeof(tbl) / sizeof(tbl[0]); idx++) 56*4a5d661aSToomas Soome tbl[idx] = 0; 57*4a5d661aSToomas Soome #endif 58*4a5d661aSToomas Soome for (; *charset != '\0'; charset++) { 59*4a5d661aSToomas Soome idx = IDX(*charset); 60*4a5d661aSToomas Soome bit = BIT(*charset); 61*4a5d661aSToomas Soome tbl[idx] |= bit; 62*4a5d661aSToomas Soome } 63*4a5d661aSToomas Soome 64*4a5d661aSToomas Soome for(s1 = s; ; s1++) { 65*4a5d661aSToomas Soome idx = IDX(*s1); 66*4a5d661aSToomas Soome bit = BIT(*s1); 67*4a5d661aSToomas Soome if ((tbl[idx] & bit) == 0) 68*4a5d661aSToomas Soome break; 69*4a5d661aSToomas Soome } 70*4a5d661aSToomas Soome return (s1 - s); 71*4a5d661aSToomas Soome } 72