Current Path : /sys/libkern/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/libkern/strcspn.c |
/*- * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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> __FBSDID("$FreeBSD: release/9.1.0/sys/libkern/strcspn.c 181748 2008-08-15 04:07:22Z kmacy $"); #include <sys/libkern.h> #include <sys/types.h> #include <sys/limits.h> #define IDX(c) ((u_char)(c) / LONG_BIT) #define BIT(c) ((u_long)1 << ((u_char)(c) % LONG_BIT)) size_t strcspn(const char * __restrict s, const char * __restrict charset) { /* * NB: idx and bit are temporaries whose use causes gcc 3.4.2 to * generate better code. Without them, gcc gets a little confused. */ const char *s1; u_long bit; u_long tbl[(UCHAR_MAX + 1) / LONG_BIT]; int idx; if(*s == '\0') return (0); #if LONG_BIT == 64 /* always better to unroll on 64-bit architectures */ tbl[0] = 1; tbl[3] = tbl[2] = tbl[1] = 0; #else for (tbl[0] = idx = 1; idx < sizeof(tbl) / sizeof(tbl[0]); idx++) tbl[idx] = 0; #endif for (; *charset != '\0'; charset++) { idx = IDX(*charset); bit = BIT(*charset); tbl[idx] |= bit; } for(s1 = s; ; s1++) { idx = IDX(*s1); bit = BIT(*s1); if ((tbl[idx] & bit) != 0) break; } return (s1 - s); }