#!/bin/sh
#
# MAKEFLOPPIES
#
# requires: expr
# Note quirk of expr: if it prints "0", it always
# returns "1" regardless of whether this makes sense!
#
# 1995.01.03	David Niemi	Created

set -e
set -u
MAJOR=2
TMPDEVICE=/dev/tmpfloppy$$
if [ ! -b /dev/fd0 ] ; then
    mknod /dev/fd0 b $MAJOR 0
fi
if floppycontrol 2>/dev/null; then
	FLOPPYCONTROL=yes
else
	FLOPPYCONTROL=no
fi

MINORNAMES='d360 h1200 D360 D720 h360 h720 H1440 E2880
	CompaQ h1440 H1680 h410 H820 h1476 H1722 h420
	H830 h1494 H1743 h880 D1040 D1120 h1600 H1760
	H1920 E3200 E3520 E3840 H1840 D800 H1600'

CMOSNAMES='360K_PC 1.2M_AT 720K 1.44M 2.88M_AMI_BIOS 2.88M'

## Used only with -t option
CMOSLETTERS='d h D H E E'
UCMOSLETTERS='d h u u u u'
CMOSFORMATS='d h D DH DHE DHE'

LOCAL=
DRIVES=
USAGE=
TYPE_OVERRIDE=u
REMAINDER=
DRYRUN=
VERBOSE=


## getword nth parameter of all the subsequent parameters
getword ()
{	if [ $# -lt 1 ]; then
		return
	fi
	if [ "$1" -lt 1 -o "$1" -ge $# ]; then
		return
	fi
	shift $1
	echo $1
}

basenumber()
{
	if [ $1 -ge 4 ] ; then
		expr $1 + 124
	else
		echo $1
	fi
}

minorname ()
{	if [ "$FLOPPYCONTROL" = no ]; then
		## No floppycontrol program, so use default values
		getword "$1" $MINORNAMES
	else
		rm -f "$TMPDEVICE"
		mknod "$TMPDEVICE" b "$MAJOR" "$1"
		floppycontrol -T "$TMPDEVICE" 2>/dev/null || :
		rm -f "$TMPDEVICE"
	fi

}

cmosid ()
{
	if [ "$FLOPPYCONTROL" = yes ]; then
		case `minorname $1` in
		d360)		echo 1 ;;
		h1200)		echo 2 ;;
		D720)		echo 3 ;;
		H1440)		echo 4 ;;
		E2880)		echo 6 ;;
		"(null)")	echo none ;;
		"")		echo none ;;
		*)		echo unknown ;;
		esac
	elif [ "$1" = 0 ]; then
		echo 4		# 1.44MB default for drive 0
	elif [ "$1" = 1 ]; then
		echo 2		# 1.2MB AT default for drive 1
	else
		echo none	# Nothing for everybody else
	fi
}

# main()

PERMISSION=666
while [ $# -ge 1 -o -n "${REMAINDER}" ]; do
	if [ -n "$REMAINDER" ]; then
		## Continue processing options stuck together
		ARG=$REMAINDER
	else
		## Get a fresh argument
		ARG=$1
		shift
		case "$ARG" in

		## Remove dash in front of option(s)
		-?*)
			ARG=`expr "-$ARG" : '-*\(.*\)' || :`
			;;
		esac
	fi

	## Break compound options up
	case "$ARG" in
	??*)	REMAINDER=`expr "$ARG" : '.\(.*\)' || :`
		ARG=`expr "$ARG" : '\(.\)' || :`
		;;
	*)	REMAINDER= ;;
	esac

	case $ARG in

	## Process drive number(s)
	[0-7])	DRIVES="$DRIVES $ARG" ;;

	[nN])	DRYRUN=yes ;;

	## Make devices in current directory, not /dev
	[lL])	LOCAL=yes ;;

	## Base device name on drive type
	[tT])	TYPE_OVERRIDE=yes ;;
	[dD])	TYPE_OVERRIDE=yes ;;

	## Base device name on media type
	[mM])	TYPE_OVERRIDE=no ;;

	## New naming scheme
	[uU])	TYPE_OVERRIDE=no ;;

	[vV])	VERBOSE=yes ;;

	## Allow access only for group floppy
	[gG])	PERMISSION=660 ;;

	*)	echo "$0: unrecognized argument \"$ARG\"." >&2
		USAGE=yes
		;;
	esac
done

if [ -n "$USAGE" ]; then
	echo "Usage: $0 [ <option> ... ] [ <drive #> ... ]" >&2
	echo 'Options:
	-l	Local (make files in local directory, not /dev)
	-n	Dry run (just report what would be done, do not do anything)
	-t	Name devices for drive type
	-d	Name devices for drive type
	-m	Name devices for media type
	-u	Use the same letter (u) for all 3 1/2 devices
	-g	Allow access only for group floppy
	-v	Verbose
' >&2
	exit 1
fi

if [ -z "$DRIVES" ]; then
	DRIVES="0 1 2 3 4 5 6 7"
fi

for DRIVE in $DRIVES; do
	if [ -n "$LOCAL" ]; then
		FILE=fd$DRIVE
	else
		FILE=/dev/fd$DRIVE
	fi
	BASENUMBER=`basenumber $DRIVE`
	CMOS=`cmosid "$BASENUMBER"`
	if [ $CMOS = none ] ; then
		echo "Drive $DRIVE is not installed or not configured, skipping"
		continue
	fi

	if [ $CMOS = unknown ] ; then
		echo "Drive $DRIVE is of unknown type, skipping"
		continue
	fi	

	CN=`getword "$CMOS" $CMOSNAMES`

	if [ "$TYPE_OVERRIDE" = u ]; then
		CL=`getword "$CMOS" $UCMOSLETTERS`
	else
		CL=`getword "$CMOS" $CMOSLETTERS`
	fi

	FORMATS=`getword "$CMOS" $CMOSFORMATS`
	if [ -n "$VERBOSE" -o -n "$DRYRUN" ]; then
		echo rm -f "$FILE"*
	fi
	if [ -z "$DRYRUN" ]; then
		rm -f "$FILE"*
	fi
	if [ -z "$CMOS" -o -z "$CN" ]; then
		echo "Skipping invalid drive \"$FILE\"" >&2
		continue
	fi
	echo "Creating \"$FILE\", ID=$DRIVE, Type=$CMOS ($CN)"
	if [ -z "$DRYRUN" ]; then
		mknod "$FILE" b "$MAJOR" "$BASENUMBER"
		chown root.floppy "$FILE"
		chmod ${PERMISSION} "$FILE"
	fi
	if [ -n "$VERBOSE" -o -n "$DRYRUN" ]; then
		echo mknod "$FILE" b "$MAJOR" "$BASENUMBER"
	fi

	## Todo: query about tracks and such (for now assume 80 only)

	BASE=4
	while [ $BASE -lt 128 ] ; do
		MINOR=`expr "$BASE" + "$BASENUMBER" || :`
		NAME=`minorname "$BASE"`
		if expr index "$FORMATS" "$NAME" >/dev/null ; then
			if [ "$TYPE_OVERRIDE" != no ]; then
				NAME=`echo $NAME | sed "s/^./$CL/g"`
			fi
		
			if [ -z	"$NAME" ]; then
				echo "Oops, skipping invalid format \"$FORMAT\"" >&2
				continue
			fi
			if [ -z "$DRYRUN" ]; then
				mknod "${FILE}${NAME}" b "$MAJOR" "$MINOR"
				chown root.floppy "${FILE}${NAME}"
				chmod ${PERMISSION} "${FILE}${NAME}"
			fi
			if [ -n "$VERBOSE" -o -n "$DRYRUN" ]; then
				echo mknod "${FILE}${NAME}" b "$MAJOR" "$MINOR"
			fi
		fi
		BASE=`expr $BASE + 4`
	done
done

## END ##