scanc.c revision 116189
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1992, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)scanc.c 8.1 (Berkeley) 6/10/93 341541Srgrimes */ 351541Srgrimes 36116189Sobrien#include <sys/cdefs.h> 37116189Sobrien__FBSDID("$FreeBSD: head/sys/libkern/scanc.c 116189 2003-06-11 05:37:42Z obrien $"); 38116189Sobrien 397109Sphk#include <sys/libkern.h> 401541Srgrimes 411541Srgrimesint 421541Srgrimesscanc(size, cp, table, mask0) 431541Srgrimes u_int size; 4417974Sbde register const u_char *cp, table[]; 451541Srgrimes int mask0; 461541Srgrimes{ 4717974Sbde register const u_char *end; 481541Srgrimes register u_char mask; 491541Srgrimes 501541Srgrimes mask = mask0; 519485Sbde for (end = &cp[size]; cp < end; ++cp) { 529485Sbde /* 539485Sbde * gcc-2.6.3 generates poor (un)sign extension code on i386's. 549485Sbde * The cast to volatile should have no effect, but in fact it 559485Sbde * improves the code on i386's. 569485Sbde */ 5717974Sbde if (table[*(volatile const u_char *)cp] & mask) 589485Sbde break; 599485Sbde } 601541Srgrimes return (end - cp); 611541Srgrimes} 62