1*58a2b000SEvgeniy Ivanov /* $NetBSD: dkcksum.c,v 1.5 2005/12/11 12:24:46 christos Exp $ */
2*58a2b000SEvgeniy Ivanov
3*58a2b000SEvgeniy Ivanov /*-
4*58a2b000SEvgeniy Ivanov * Copyright (c) 1993
5*58a2b000SEvgeniy Ivanov * The Regents of the University of California. All rights reserved.
6*58a2b000SEvgeniy Ivanov *
7*58a2b000SEvgeniy Ivanov * Redistribution and use in source and binary forms, with or without
8*58a2b000SEvgeniy Ivanov * modification, are permitted provided that the following conditions
9*58a2b000SEvgeniy Ivanov * are met:
10*58a2b000SEvgeniy Ivanov * 1. Redistributions of source code must retain the above copyright
11*58a2b000SEvgeniy Ivanov * notice, this list of conditions and the following disclaimer.
12*58a2b000SEvgeniy Ivanov * 2. Redistributions in binary form must reproduce the above copyright
13*58a2b000SEvgeniy Ivanov * notice, this list of conditions and the following disclaimer in the
14*58a2b000SEvgeniy Ivanov * documentation and/or other materials provided with the distribution.
15*58a2b000SEvgeniy Ivanov * 3. Neither the name of the University nor the names of its contributors
16*58a2b000SEvgeniy Ivanov * may be used to endorse or promote products derived from this software
17*58a2b000SEvgeniy Ivanov * without specific prior written permission.
18*58a2b000SEvgeniy Ivanov *
19*58a2b000SEvgeniy Ivanov * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20*58a2b000SEvgeniy Ivanov * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21*58a2b000SEvgeniy Ivanov * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22*58a2b000SEvgeniy Ivanov * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23*58a2b000SEvgeniy Ivanov * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24*58a2b000SEvgeniy Ivanov * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25*58a2b000SEvgeniy Ivanov * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26*58a2b000SEvgeniy Ivanov * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27*58a2b000SEvgeniy Ivanov * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28*58a2b000SEvgeniy Ivanov * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29*58a2b000SEvgeniy Ivanov * SUCH DAMAGE.
30*58a2b000SEvgeniy Ivanov *
31*58a2b000SEvgeniy Ivanov * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
32*58a2b000SEvgeniy Ivanov */
33*58a2b000SEvgeniy Ivanov
34*58a2b000SEvgeniy Ivanov #include <sys/param.h>
35*58a2b000SEvgeniy Ivanov #include <sys/disklabel.h>
36*58a2b000SEvgeniy Ivanov #include "stand.h"
37*58a2b000SEvgeniy Ivanov
38*58a2b000SEvgeniy Ivanov /*
39*58a2b000SEvgeniy Ivanov * Compute checksum for disk label.
40*58a2b000SEvgeniy Ivanov */
41*58a2b000SEvgeniy Ivanov int
dkcksum(const struct disklabel * lp)42*58a2b000SEvgeniy Ivanov dkcksum(const struct disklabel *lp)
43*58a2b000SEvgeniy Ivanov {
44*58a2b000SEvgeniy Ivanov const u_short *start, *end;
45*58a2b000SEvgeniy Ivanov u_short sum = 0;
46*58a2b000SEvgeniy Ivanov
47*58a2b000SEvgeniy Ivanov start = (const void *)lp;
48*58a2b000SEvgeniy Ivanov end = (const void *)&lp->d_partitions[lp->d_npartitions];
49*58a2b000SEvgeniy Ivanov while (start < end)
50*58a2b000SEvgeniy Ivanov sum ^= *start++;
51*58a2b000SEvgeniy Ivanov return sum;
52*58a2b000SEvgeniy Ivanov }
53