70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/* $NetBSD: disklabel.c,v 1.10 2007/11/24 13:20:54 isaki Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)disklabel.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/param.h>
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#include <sys/disklabel.h>
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#include "stand.h"
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#if defined(LIBSA_NO_DISKLABEL_MSGS)
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#define nolabel (char *)1
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#define corruptedlabel (char *)1
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#else
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static char nolabel[] = "no disk label";
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static char corruptedlabel[] = "disk label corrupted";
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#endif
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char *
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getdisklabel(const char *buf, struct disklabel *lp)
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{
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const struct disklabel *dlp, *elp;
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char *msg = NULL;
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elp = (const void *)(buf + DEV_BSIZE - sizeof(*dlp));
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for (dlp = (const void *)buf; dlp <= elp;
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dlp = (const void *)((const char *)dlp + sizeof(long))) {
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if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
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if (msg == NULL)
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msg = nolabel;
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} else if (dlp->d_npartitions > MAXPARTITIONS ||
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dkcksum(dlp) != 0) {
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msg = corruptedlabel;
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} else {
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(void)memcpy(lp, dlp, sizeof *lp);
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msg = NULL;
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break;
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}
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}
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return msg;
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}
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