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Given this Lua function:

function write_log(level, ...)
local str = string.format(...)
logger:log(logging.level[level], str)

Is it possible to pass varargs  from C to Lua like so:

int wrlog(int level, ...)
lua_getglobal(L, "write_log");
<slick code that passes varags goes here>
lua_call(L, lua_gettop(L)-1, 0);

I've found this on stack overflow:
///Rh - Replaced old call for 5.3 syntax
lua_getglobal(L, "write_log");
(L, 1); lua_call(L, lua_gettop(L)-1, 0);

But I'm still not getting what I want. I also found call_va from in the online 5.2 PIL, but it requires I know how many parameters I am passing in and what type they are.  I was also trying to avoid sprintf because I'm lazy and want Lua to do all the heavy lifting.

Thoughts (other than 'don't be so lazy')?