GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/vmd/disklabel.c Lines: 0 16 0.0 %
Date: 2017-11-13 Branches: 0 14 0.0 %

Line Branch Exec Source
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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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