Lua Container problem

[Xleniz]

I need help with a lua script. I'm trying to make a script that gives you an item, and that will check if you have enough spaces in backpack or cap (so it doesn't drop at floor). But I can't find the "checkcontainerspaces" function. Here's a part of the script:

	if(getPlayerFreeCap(cid) < getItemWeightById(id, 1)) then
	doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "You do not have enough cap.")
	return false
	end
	
	if(getPlayerSlotItem(cid, 3)==0) then
	doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "You do not have enough space.")
	return false
	end
	
	doPlayerAddItem(cid, id)
	doSendMagicEffect(getCreaturePosition(cid), 31)

Thx.