1 /* $OpenBSD: dkcksum.c,v 1.7 2004/09/28 17:57:46 otto Exp $ */ 2 /* $NetBSD: dkcksum.c,v 1.6 1995/03/18 14:54:42 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)dkcksum.c 8.1 (Berkeley) 6/5/93"; 36 #else 37 static char rcsid[] = "$OpenBSD: dkcksum.c,v 1.7 2004/09/28 17:57:46 otto Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 #include <sys/disklabel.h> 43 #include <stdio.h> 44 #include "extern.h" 45 46 u_short 47 dkcksum(struct disklabel *lp) 48 { 49 u_short *start, *end; 50 u_short sum = 0; 51 52 start = (u_short *)lp; 53 end = (u_short *)&lp->d_partitions[lp->d_npartitions]; 54 while (start < end) 55 sum ^= *start++; 56 return (sum); 57 } 58