#!/bin/sh
## http://kobyla.info/soft/dumplabel
## $Id: dumplabel,v 1.8 2013/09/02 11:06:38 pdc Exp $


CNT=1
cd /dev

help=
nl="
"
VN=$1
{ [ -z "$VN" ] && help="$help "; } || 
{ [ ! -r "$VN" ] && help="$help${nl}Unable to read vnode: $VN" ;}

if [ -n "$2" ]; then
	[ "$2" -gt 0 ] 2>/dev/null && CNT=$2 || help="$help${nl}Invalid sector count: $2"
fi

[ -z "$help" ] && { DI=`diskinfo $VN` || help="$help${nl}Not a disk? $VN" ;}

if [ -n "$help" ]; then
	echo "Usage:
	$0 <vnode> [<sector count> [hd options]]$help"
	{ [ "$help" = " " ] && exit; } || exit 65
fi

LAST=`echo "$DI" | awk "{print \\$4-$CNT}"`
echo "VN=$VN CNT=$CNT LAST=$LAST // $DI" > /dev/stderr
dd if=$VN skip=$LAST count=$CNT | (sleep 0.2;hd $3 ) | tr '\176-\377' 'Û'