C API: passing by reference

[stuart.tett at gmail.com]

I'm writing my own python extension module with the C API. In python
all functions pass arguments by reference, but how can I make use of
this in C? Right now, I am using:

PyArg_ParseTuple(args, "(ii)(ii)", &faceId1, &vertId1, &faceId2,
&vertId2)

I want the to change the faceId's in my function. From what I've seen
you can't do this safely with PyArg_ParseTuple.

Do I have another option?

Otherwise, I just have to return an extra variable. But it would be
much much nicer to just have the faceId's change if the arguments
passed were variables.

Thanks!