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Fix redstone comparator flooding crash

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Redstone comparators have two modes, comparison mode & subtraction mode.
Before this patch, the functions to turn comparators on or off attempted
to swap nodes with comparators in the same mode, but failed to determine
the correct replacement node, if the existing node was not a comparator.

When a comparator in an on state (e.g. powered by a filled cauldron) was
flooded, the flooding dropped the comparator and replaced the comparator
node that was to be swapped out with air, which lead to a server crash.

This patch changes the functions that turn comparators on or off so they
only swap existing nodes with comparators in the same mode if the name
of the replacement node can be determined – i.e. if it is not nil.
This commit is contained in:
Nils Dagsson Moskopp 2022-02-21 16:51:52 +01:00 committed by cora
parent a4e541bcd2
commit 41550da87b
1 changed files with 8 additions and 2 deletions
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10
mods/ITEMS/REDSTONE/mcl_comparators/init.lua
View file

@ -43,14 +43,20 @@ end
local function comparator_activate(pos, node)
local def = minetest.registered_nodes[node.name]
minetest.swap_node(pos, { name = def.comparator_onstate, param2 = node.param2 })
local onstate = def.comparator_onstate
if onstate then
minetest.swap_node(pos, { name = onstate, param2 = node.param2 })
end
minetest.after(0.1, comparator_turnon , {pos = pos, node = node})
end
local function comparator_deactivate(pos, node)
local def = minetest.registered_nodes[node.name]
minetest.swap_node(pos, { name = def.comparator_offstate, param2 = node.param2 })
local offstate = def.comparator_offstate
if offstate then
minetest.swap_node(pos, { name = offstate, param2 = node.param2 })
end
minetest.after(0.1, comparator_turnoff, {pos = pos, node = node})
end