Dividing by Zero in line function causes Tic-80 to crash.

[12buntu]

The below code causes Tic-80 to completely crash, and in some cases it even slowed down the rest of my computer. I understand dividing by zero is impossible, but in other functions (namely print), it only throws an error.

Note: I originally discovered the problem in Wren, but discovered it also applied when using Lua, I assume it also applies in other languages.

function TIC()
    line(x/0,y0,x1,y1,color)	
end

[nesbox]

I tried to reproduce it on Windows without success, I suppose you are using Linux?

[RobLoach]

Did some debugging. Found that when line() is passed an inf, it thinks heavily about it for a while. It doesn't crash, but does seem like it does, at least on Linux. Here is a demo case...

-- title:  game title
-- author: game developer
-- desc:   short description
-- script: lua

specialValue = 10
x = 10
instructions = "Press/hold UP to see the line"

function TIC()
	cls()
	print(instructions, math.sin(x / 50) * 50 + 50, 0)
	print("Special Value: " .. specialValue, 10, 20)
	x = x + 1

	if btn(0) then
		line(specialValue, 10, 20, 20, 13)
		print("Up is pressed!", 20, 100)
		instructions = "Press DOWN to set\n special value to 500 / 0"
	end

	if btn(1) then
		-- Set special value to inf
		specialValue = 500 / 0
		instructions = "Press UP again to use inf in line()"
	end
end

[12buntu]

I tried to reproduce it on Windows without success, I suppose you are using Linux?

Yes, I am

[superogue]

i have had issues in other places with dividing by zero, so i had to add small float value to work around it.

[nesbox]

I did a little research, and agreed with @RobLoach x / 0 == INF, which became -2147483648 inside TIC,
after that, it tries to draw a very large line with line parameters (-2147483648, y0, x1, y1, color).
I think this is not a crash or a bug, this is normal behavior, you can even hold down ESC and exit the program.
WONTFIX