1 /* $NetBSD: dkcksum.c,v 1.13 2010/01/05 15:45:26 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)dkcksum.c 8.1 (Berkeley) 6/5/93"; 40 #else 41 __RCSID("$NetBSD: dkcksum.c,v 1.13 2010/01/05 15:45:26 tsutsui Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #if HAVE_NBTOOL_CONFIG_H 47 #include <nbinclude/sys/disklabel.h> 48 #else 49 #include <sys/disklabel.h> 50 #endif /* HAVE_NBTOOL_CONFIG_H */ 51 #include "dkcksum.h" 52 53 uint16_t 54 dkcksum(struct disklabel *lp) 55 { 56 57 return dkcksum_sized(lp, lp->d_npartitions); 58 } 59 60 uint16_t 61 dkcksum_sized(struct disklabel *lp, size_t npartitions) 62 { 63 uint16_t *start, *end; 64 uint16_t sum; 65 66 sum = 0; 67 start = (uint16_t *)lp; 68 end = (uint16_t *)&lp->d_partitions[npartitions]; 69 while (start < end) 70 sum ^= *start++; 71 return sum; 72 } 73