#!/bin/ksh
wd=$(pwd)
if [[ ! -r ./zapb ]] ;
then
	echo zapb is missing, please compile zapb.c with: '"cc -o zapb zapb.c"'
	exit 1
fi
cd /
grep ris.dec /etc/bootptab | tr ':' '\n' | grep bf= | sed 's/bf=//' | while read kr
do
	echo Found Ris Kernel: $kr
	if [[ -L $kr ]] && [[ -r $kr ]] ; then
		dr=$(dirname $kr)
		cd $dr
		fi=$(ls -l $kr | awk '{print $11}')
		kn=$(basename $fi)
		case $kn in
		vmunix*[0-9])
			sum $fi | read ck1 ck2 xx
			if [[ $ck1 = 18569 ]] && [[ $ck2 = 8716 ]]; then
				/bin/true
			else
				echo Ris Kernel: Original Checksum Not Match $fi
				exit 1
			fi
			/bin/cp -p $fi $fi.BT
			echo Patching: netboot_bootp_open:467
			echo '	"bis zero, 2, s5" ==> "bis zero, 30, s5"'
			$wd/zapb $fi.BT  171388 0x455ff10a47e3d40e
			echo Patching: bootp_info:3464
			echo '	"bis zero, 4, s4" ==> "bis zero, 30, s4"'
			echo '	"bis zero, 5, s6" ==> "bis zero, 31, s6"'
			$wd/zapb $fi.BT 3139788 0x47e3f40f47e3d40d
			sum $fi.BT | read ck1 ck2 xx
			if [[ $ck1 = 53020 ]] && [[ $ck2 = 8716 ]]; then
				/bin/rm -f $kr
				ln -s $fi.BT $kr
				echo Ris Kernel: $kr '->' $fi.BT Successfully Patched
				exit 0
			else
				echo Ris Kernel: $fi.BT Patch Failed Checksum Not Match
				exit 1
			fi
			;;
		vmunix*.BT)
			sum $fi | read ck1 ck2 xx
			if [[ $ck1 = 53020 ]] && [[ $ck2 = 8716 ]]; then
				echo Ris Kernel: Already Patched $fi
			else
				echo Ris Kernel: Patched Checksum Not Match $fi
				exit 1
			fi
			;;
		*)
			echo Ris Kernel: Illegal Name $fi
			exit 1
		esac
		
	else
		echo Ris Kernel: Invalid $kr
		exit 1
	fi
done