Annotation of sys/lib/libsa/dkcksum.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: dkcksum.c,v 1.5 2003/08/11 06:23:09 deraadt Exp $ */
2: /* $NetBSD: disklabel.c,v 1.3 1994/10/26 05:44:42 cgd Exp $ */
3:
4: /*-
5: * Copyright (c) 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: * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
33: */
34:
35: #include <sys/param.h>
36: #include <sys/disklabel.h>
37: #include "stand.h"
38:
39: /*
40: * Compute checksum for disk label.
41: */
42: u_int
43: dkcksum(struct disklabel *lp)
44: {
45: u_short *start, *end;
46: u_short sum = 0;
47:
48: start = (u_short *)lp;
49: end = (u_short *)&lp->d_partitions[lp->d_npartitions];
50: while (start < end)
51: sum ^= *start++;
52: return (sum);
53: }
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