NetBSD/sbin/disklabel/dkcksum.c

74 lines
2.4 KiB
C

/* $NetBSD: dkcksum.c,v 1.14 2013/05/03 16:05:12 matt Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)dkcksum.c 8.1 (Berkeley) 6/5/93";
#else
__RCSID("$NetBSD: dkcksum.c,v 1.14 2013/05/03 16:05:12 matt Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#if HAVE_NBTOOL_CONFIG_H
#include <nbinclude/sys/disklabel.h>
#else
#include <sys/disklabel.h>
#endif /* HAVE_NBTOOL_CONFIG_H */
#include "dkcksum.h"
uint16_t
dkcksum(const struct disklabel *lp)
{
return dkcksum_sized(lp, lp->d_npartitions);
}
uint16_t
dkcksum_sized(const struct disklabel *lp, size_t npartitions)
{
const uint16_t *start, *end;
uint16_t sum;
sum = 0;
start = (const uint16_t *)lp;
end = (const uint16_t *)&lp->d_partitions[npartitions];
while (start < end) {
sum ^= *start++;
}
return sum;
}