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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.
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kaeza authored and est31 committed Feb 8, 2016
1 parent 16c7008 commit 430195381d8d7254a7b8cdcf6b50769c2c598329
Showing with 5 additions and 1 deletion.
  1. +5 −1 builtin/init.lua
@@ -12,7 +12,11 @@ if core.print then
-- Override native print and use
-- terminal if that's turned on
function print(...)
core_print(table.concat({...}, "\t"))
local n, t = select("#", ...), { ... }
for i = 1, n do
t[i] = tostring(t[i])
core_print(table.concat(t, "\t"))
core.print = nil -- don't pollute our namespace

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