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#!/bin/rc
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dosdisk=`{ls /dev/sd??/dos >[2]/dev/null | sed 1q | sed 's!.*/(.*)/dos!\1!'}
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if(~ $#dosdisk 0 || ! c: || ! test -f /n/c:/autoexec.bat || ! test -f /n/c:/config.sys) {
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	echo 'Could not find autoexec.bat or config.sys on the first FAT disk.' >[1=2]
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	exit
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}
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for (i in autoexec config msdos)
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	if(test -f /n/c:/$i.p9) {
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		echo 'A Plan 9 backup already exists; will not edit system files again.' >[1=2]
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		exit
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	}
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for (i in autoexec.bat config.sys msdos.sys)
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	if(! cp /n/c:/$i /n/c:/^`{echo $i | sed 's/\.(bat|sys)$/.p9/'}) {
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		echo 'Could not back up '^$i^'; will not continue.' >[1=2]
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		exit
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	}
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if(! test -d /n/c:/plan9 && ! mkdir /n/c:/plan9) {
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	echo 'Could not create directory /n/c:/plan9.' >[1=2]
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	exit
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}
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if(! cp /386/^(9load ld.com) /386/9pcdisk /n/c:/plan9) {
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	echo 'Could not copy Plan 9 boot files into /n/c:/plan9.' >[1=2]
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	exit
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}
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chmod +w /n/c:/autoexec.bat /n/c:/config.sys /n/c:/msdos.sys
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if(grep -si 'Plan ?9' /n/c:/config.sys || grep -si 'Plan ?9' /n/c:/autoexec.bat) {
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	echo 'Plan 9 entries already in config.sys or autoexec.bat.' >[1=2]
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	echo 'Not changing them; refer to Plan 9 install documentation' >[1=2]
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	echo 'to configure manually.' >[1=2]
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	exit
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}
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if(! grep -si '\[menu\]' /n/c:/config.sys) {
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	{
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		echo 1
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		echo i
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		echo '[menu]
'
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		echo 'menuitem=windows, Windows
'
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		echo 'menudefault=windows
'
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		echo '
'
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		echo '[common]
'
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		echo '
'
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		echo '[windows]
'
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		echo .
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		echo w
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		echo q
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	} | ed /n/c:/config.sys >/dev/null >[2]/dev/null
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}
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{
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	echo 1
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	echo '/\[[Mm][Ee][Nn][Uu]\]'
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	echo '?^[Mm][Ee][Nn][Uu][Ii][Tt][Ee][Mm]='
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	echo a
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	echo 'menuitem=plan9, Plan 9 from Bell Labs
'
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	echo '$'
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	echo a
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	echo '
'
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	echo '[plan9]
'
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	echo '
'
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	echo .
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	echo w
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	echo q
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} | ed /n/c:/config.sys >/dev/null >[2]/dev/null
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{
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	echo 1
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	echo i
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	echo '@echo off
'
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	echo 'if %config%==plan9 goto plan9
'
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	echo 'goto notplan9
'
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	echo ':plan9
'
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	echo 'plan9\ld '^$dosdisk^'!dos!plan9/9load
'
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	echo ':notplan9
'
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	echo .
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	echo q
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} | ed /n/c:/autoexec.bat >/dev/null >[2]/dev/null
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fn zeroopt {
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	if(grep -s '^'^$1^'=1' /n/c:/msdos.sys) {
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		{
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			echo '/^'^$1^'=1/s/=1/=0/'
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			echo w
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			echo q
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		} | ed /n/c:/msdos.sys >/dev/null >[2]/dev/null
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	}
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	if not if (grep -s '^'^$1^'=0' /n/c:/msdos.sys)
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		;
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	if not {
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		{
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			echo 1
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			echo i
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			echo '[Options]
'
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			echo 'Logo=0
'
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			echo w
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			echo q
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		} | ed /n/c:/msdos.sys >/dev/null >[2]/dev/null
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	}
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}
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if(grep -si '^\[paths\]' /n/c:/msdos.sys){	# Windows 9x rather than DOS
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	zeroopt Logo
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}
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exit
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