Minecraft Turtle Rectangular Digging Program

print("Please enter the length, width, and height of the room, in that order.")
--local tArgs = io.read()
--length = tonumber(tArgs[1])
--width = tonumber(tArgs[2])
--height = tonumber(tArgs[3])

length = tonumber(io.read())
width = tonumber(io.read())
height = tonumber(io.read())
turnRight = true

for heightCounter = 0, (height-1) do
    for widthCounter = 0, (width - 1) do

        while turtle.getFuelLevel() <= length do
            turtle.select(1)
            if turtle.refuel(1) == false then
                error("Out of fuel!")
                --exit()
            end
            --turtle.refuel(1)
        end

        --Dig down 1 row
        for lengthCounter = 0, (length - 2) do
            if turtle.forward() == false then
                repeat
                    turtle.dig()
                    sleep(0.25)
                until turtle.forward() == true
            end
        end

        if widthCounter < (width - 1) then
            if turnRight then
                turtle.turnRight()
                if turtle.forward() == false then
                    repeat
                        turtle.dig()
                        sleep(0.25)
                    until turtle.forward() == true
                end
                turtle.turnRight()
                turnRight = false

            else
                turtle.turnLeft()
                if turtle.forward() == false then
                    repeat
                        turtle.dig()
                        sleep(0.25)
                    until turtle.forward() == true
                end
                turtle.turnLeft()
                turnRight = true
            end
        end
    end
    if heightCounter < (height - 1) then
        if turtle.up() == false then
            repeat
                turtle.digUp()
                sleep(0.25)
            until turtle.up() == true
        end
        turtle.turnRight()
        turtle.turnRight()
    end
end

for heightCounter = 0, (height-1) do
    turtle.down()
end
if (width * height) % 2 == 0 then
    turtle.turnRight()
    turtle.turnRight()
    for lengthCounter = 0, (length-1) do
        turtle.forward()
    end
end
if height % 2 ~= 0 then
    turtle.turnRight()
    for widthCounter = 0, (width - 1) do
        turtle.forward()
    end
    turtle.turnLeft()
end
print("Done!")