Re: Problem with 'write(format()) ' wrapper

[Luiz Henrique de Figueiredo <lhf@...>]

>If I call the Printf function
>in the script with something like Printf(undeclared), then my _PRINTF
>function gets NULL as a string.

Apparently _PRINTF is written in C and you're calling lua_tostring(L,1)
without first checking lua_isstring(L,1). format checks this and so the
error message. (lua_tostring returns NULL for everything that is not a string
or number, including nil.)
	--lhf