1df8bae1dSRodney W. Grimes /*- 2df8bae1dSRodney W. Grimes * Copyright (c) 1992, 1993 3df8bae1dSRodney W. Grimes * The Regents of the University of California. All rights reserved. 4df8bae1dSRodney W. Grimes * 5df8bae1dSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 6df8bae1dSRodney W. Grimes * modification, are permitted provided that the following conditions 7df8bae1dSRodney W. Grimes * are met: 8df8bae1dSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 9df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 10df8bae1dSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 11df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 12df8bae1dSRodney W. Grimes * documentation and/or other materials provided with the distribution. 13df8bae1dSRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 14df8bae1dSRodney W. Grimes * must display the following acknowledgement: 15df8bae1dSRodney W. Grimes * This product includes software developed by the University of 16df8bae1dSRodney W. Grimes * California, Berkeley and its contributors. 17df8bae1dSRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 18df8bae1dSRodney W. Grimes * may be used to endorse or promote products derived from this software 19df8bae1dSRodney W. Grimes * without specific prior written permission. 20df8bae1dSRodney W. Grimes * 21df8bae1dSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22df8bae1dSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23df8bae1dSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24df8bae1dSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25df8bae1dSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26df8bae1dSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27df8bae1dSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28df8bae1dSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29df8bae1dSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30df8bae1dSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31df8bae1dSRodney W. Grimes * SUCH DAMAGE. 32df8bae1dSRodney W. Grimes * 33df8bae1dSRodney W. Grimes * @(#)scanc.c 8.1 (Berkeley) 6/10/93 34df8bae1dSRodney W. Grimes */ 35df8bae1dSRodney W. Grimes 36ab0de15bSDavid E. O'Brien #include <sys/cdefs.h> 37ab0de15bSDavid E. O'Brien __FBSDID("$FreeBSD$"); 38ab0de15bSDavid E. O'Brien 395edd0e15SPoul-Henning Kamp #include <sys/libkern.h> 40df8bae1dSRodney W. Grimes 41df8bae1dSRodney W. Grimes int 42df8bae1dSRodney W. Grimes scanc(size, cp, table, mask0) 43df8bae1dSRodney W. Grimes u_int size; 44e0c95ed9SBruce Evans register const u_char *cp, table[]; 45df8bae1dSRodney W. Grimes int mask0; 46df8bae1dSRodney W. Grimes { 47e0c95ed9SBruce Evans register const u_char *end; 48df8bae1dSRodney W. Grimes register u_char mask; 49df8bae1dSRodney W. Grimes 50df8bae1dSRodney W. Grimes mask = mask0; 515182dcbeSBruce Evans for (end = &cp[size]; cp < end; ++cp) { 525182dcbeSBruce Evans /* 535182dcbeSBruce Evans * gcc-2.6.3 generates poor (un)sign extension code on i386's. 545182dcbeSBruce Evans * The cast to volatile should have no effect, but in fact it 555182dcbeSBruce Evans * improves the code on i386's. 565182dcbeSBruce Evans */ 57e0c95ed9SBruce Evans if (table[*(volatile const u_char *)cp] & mask) 585182dcbeSBruce Evans break; 595182dcbeSBruce Evans } 60df8bae1dSRodney W. Grimes return (end - cp); 61df8bae1dSRodney W. Grimes } 62