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/* $OpenBSD: disklabel.c,v 1.2 2017/08/29 21:10:20 deraadt Exp $ */ |
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/* $NetBSD: disklabel.c,v 1.3 1994/10/26 05:44:42 cgd 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> /* DEV_BSIZE */ |
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#include <sys/disklabel.h> |
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#include "vmboot.h" |
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/* |
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* Compute checksum for disk label. |
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*/ |
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u_int |
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dkcksum(struct disklabel *lp) |
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{ |
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const u_short *start, *end; |
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u_short sum = 0; |
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start = (u_short *)lp; |
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end = (u_short *)&lp->d_partitions[lp->d_npartitions]; |
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while (start < end) |
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sum ^= *start++; |
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return (sum); |
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} |
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char * |
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getdisklabel(char *buf, struct disklabel *lp) |
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{ |
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struct disklabel *dlp, *elp; |
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char *msg = NULL; |
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elp = (struct disklabel *)(buf + DEV_BSIZE - sizeof(*dlp)); |
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for (dlp = (struct disklabel *)buf; dlp <= elp; |
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dlp = (struct disklabel *)((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 = "no disk label"; |
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} else if (dlp->d_npartitions > MAXPARTITIONS || |
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dkcksum(dlp) != 0) |
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msg = "disk label corrupted"; |
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else { |
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*lp = *dlp; |
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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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