turtle

function turn(dir, times)
	times = times or 1
	for i = 1, times, 1 do
		if dir == "right" then
			turtle.turnRight()
		elseif dir == "left" then
			turtle.turnLeft()
		end
	end
end

function swapRowDir(currentDir)
	if currentDir == "right" then
		return "left"
	elseif currentDir == "left" then
		return "right"
	end
end

function swapColDir(currentDir)
	if currentDir == "up" then
		return "down"
	elseif currentDir == "down" then
		return "up"
	end
end

function sForward(times)
	times = times or 1
	for i = 1, times, 1 do
		if not turtle.forward() then
			return i - 1
		end
	end
	return times
end

function sUp(times)
	times = times or 1
	for i = 1, times, 1 do
		if not turtle.up() then
			return i - 1
		end
	end
	return times
end

function sDown(times)
	times = times or 1
	for i = 1, times, 1 do
		if not turtle.down() then
			return i - 1
		end
	end
	return times
end