#!/bin/sh
# Convert a FreeBSD Driver into DriverAPI version. Doesn't take care of all the
# cases yet, but still does about 95% of work.
# Author: Sreekanth Rupavatharam
# Juniper networks - 2014

if [ $# -lt 1 ]
then
	echo " $0 <driver source (e.g., if_em.c)>";
	exit 1;
fi

# XXX - This needs to change if the data structure uses different name
__ifp__="ifp";

file=$1

rotateCursor() {
  case $toggle
  in
    1)
      printf " \\ "
      printf "\b\b"
      toggle="2"
    ;;

    2)
      printf " | "
      printf "\b\b\b"
      toggle="3"
    ;;

    3)
      printf " / "
      printf "\b\b\b"
      toggle="4"
    ;;

    *)
      printf " - "
      printf "\b\b\b"
      toggle="1"
    ;;
  esac
}

handle_set() {
# Handle the case where $__ifp__->if_blah = XX;
	line=$1
	set=`echo $line| grep "$__ifp__->.* = "`
	if [ ! -z "$set" ]
	then
		word=`echo $line | awk -F "if_" ' { print $2 }' | awk -F" =" '{ print $1 }'`
		value=`echo $line | awk -F "=" '{ print $2 }' | sed -e 's/;//g'`
		new=`echo if_set$word"\($__ifp__,"$value");"`
		new=`echo $new | sed -e 's/&/\\\&/'`
		old=`echo $line|sed -e 's/^[ 	]*//'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0
	fi
	return 1
}

handle_inc() {
	line=$1	
	inc=`echo $line | grep "$__ifp__->.*++"`
	if [ ! -z "$inc" ]
	then
		word=`echo $line | awk -F"if_" '{ print $2 }'|awk -F"\+" '{ print $1}'`
		value=' 1';
		old=`echo $line|sed -e 's/^[ 	]*//'`
		new=`echo if_inc$word"\($__ifp__,"$value");"`
		new=`echo $new | sed -e 's/&/\\\&/'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0;
	fi	
	return 1;
}

handle_add() {
	line=$1
	add=`echo $line|grep "$__ifp__->.*+= "`
	if [ ! -z "$add" ]
	then
		word=`echo $line | awk -F"if_" '{ print $2 }'|awk '{ print $1}'`
		value=`echo $line | awk -F"=" '{ print $2}' | sed -e 's/;//g'`
		new=`echo if_inc$word"\($__ifp__,$value);"`
		new=`echo $new | sed -e 's/&/\\\&/'`
		old=`echo $line|sed -e 's/^[ 	]*//'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0
	fi
	return 1;

}

handle_or() {
	line=$1
	or=`echo $line|grep "$__ifp__->.*|= "`
	if [ ! -z "$or" ]
	then
		word=`echo $line | awk -F"if_" '{ print $2 }'|awk '{ print $1}'`	
		value=`echo $line | awk -F"=" '{ print $2}' | sed -e 's/;//g'`
		new=`echo if_set${word}bit"($__ifp__,$value, 0);"`
		new=`echo $new | sed -e 's/&/\\\&/'` 
		#line=`echo $line|sed -e 's/&/\\&/'`
		old=`echo $line|sed -e 's/^[ 	]*//'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0;
	fi
	return 1;

}

handle_and() {
	line=$1
	or=`echo $line|grep "$__ifp__->.*&= "`
	if [ ! -z "$or" ]
	then
		word=`echo $line | awk -F"if_" '{ print $2 }'|awk '{ print $1}'`	
		value=`echo $line | awk -F"=" '{ print $2}' | sed -e 's/;//g'`
		value=`echo $value | sed -e's/~//g'`
		new=`echo if_set${word}bit"\($__ifp__, 0,$value);"`
		new=`echo $new | sed -e 's/&/\\\&/'`
		old=`echo $line|sed -e 's/^[ 	]*//'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0;
	fi
	return 1;

}

# XXX - this needs updating
handle_misc() {
	line=$1
	get=`echo $line | grep "if_capabilities\|if_flags\|if_softc\|if_capenable\|if_mtu\|if_drv_flags"`
	if [ ! -z "$get" ]
	then
		word=`echo $line |awk -F"$__ifp__->if_" '{ print $2 }' | \
			sed -e's/[^a-zA-Z0-9_]/\@/'|awk -F"\@" '{ print $1}'`
		old=`echo "$__ifp__->if_"${word}`
		new=`echo "if_get"${word}"($__ifp__)"`
		new=`echo $new | sed -e 's/&/\\\&/'`
		line=`echo $line| sed -e's/'$old'/'$new'/g'`
		return 0;
	fi
	return 1;

}

if [ -e $file.tmp ]
then
	rm $file.tmp
fi
IFS=
echo -n "Conversion for $file started, please wait: "
FAIL_PAT="XXX - DRVAPI"
count=0
cat $1 | while read -r line
do
count=`expr $count + 1`
rotateCursor 
pat=`echo $line | grep "$__ifp__->"`
while  [ "$pat" != "" ]
do
	pat=`echo $line | grep "$__ifp__->"`
	if [ ! -z `echo $pat | grep "$FAIL_PAT"` ]
	then
		break;
	fi

	handle_set $line
	
	if [ $? != 0 ]
		then 
		handle_inc $line
	fi

	if [ $? != 0 ]
	then
		handle_add $line
	fi

	if [ $? != 0 ]
	then
		handle_or $line
	fi

	if [ $? != 0 ]
	then
		handle_and $line
	fi

	if [ $? != 0 ]

	then
		handle_misc $line
	fi
	
	if [ $? != 0 ]
	then
		if [ ! -z `echo $line | grep "$__ifp__->"` ]
		then
			line=`echo $line | sed -e 's:$: \/* '${FAIL_PAT}' *\/:g'`
		fi
	fi
done
	# Replace the ifnet * with if_t
	if [ ! -z `echo $line | grep "struct ifnet"` ]
	then
		line=`echo $line | sed -e 's/struct ifnet[ \t]*\*/if_t /g'`
	fi
	echo "$line" >> $file.tmp
done
echo ""
count=`grep $FAIL_PAT $file.tmp | wc -l`
if [ $count -gt 0 ]
then
	echo "$count lines could not be converted to DRVAPI"
	echo "Look for /* $FAIL_PAT */ in the converted file"
fi
echo "original $file  has been moved to $file.orig"
mv $file $file.orig
mv $file.tmp $file