builtin: Fix print crashing on nil "holes".

The engine implementation of `print` packs the varargs into a
table and passes the table directly to `table.concat`. If you
pass any value not supported by `table.concat` (particularly
`nil`), the server crashes. This is unexpected behavior, as
`print` is supposed to be able to work with anything.

This patch changes the implementation so it first converts
all arguments using `tostring`, which fixes the issue and
makes the custom `print` function compatible with the stock
Lua behavior.
This commit is contained in:
Diego Martinez 2016-02-04 09:58:44 -03:00 committed by est31
parent 16c7008771
commit 430195381d

@ -12,7 +12,11 @@ if core.print then
-- Override native print and use -- Override native print and use
-- terminal if that's turned on -- terminal if that's turned on
function print(...) function print(...)
core_print(table.concat({...}, "\t")) local n, t = select("#", ...), { ... }
for i = 1, n do
t[i] = tostring(t[i])
end
core_print(table.concat(t, "\t"))
end end
core.print = nil -- don't pollute our namespace core.print = nil -- don't pollute our namespace
end end