scanc.c revision 9485
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 341817Sdg * 359485Sbde * $Id: scanc.c,v 1.3 1995/03/17 06:15:39 phk Exp $ 361541Srgrimes */ 371541Srgrimes 387109Sphk#include <sys/libkern.h> 391541Srgrimes 401541Srgrimesint 411541Srgrimesscanc(size, cp, table, mask0) 421541Srgrimes u_int size; 431541Srgrimes register u_char *cp, table[]; 441541Srgrimes int mask0; 451541Srgrimes{ 461541Srgrimes register u_char *end; 471541Srgrimes register u_char mask; 481541Srgrimes 491541Srgrimes mask = mask0; 509485Sbde for (end = &cp[size]; cp < end; ++cp) { 519485Sbde /* 529485Sbde * gcc-2.6.3 generates poor (un)sign extension code on i386's. 539485Sbde * The cast to volatile should have no effect, but in fact it 549485Sbde * improves the code on i386's. 559485Sbde */ 569485Sbde if (table[*(volatile u_char *)cp] & mask) 579485Sbde break; 589485Sbde } 591541Srgrimes return (end - cp); 601541Srgrimes} 61