Wrapping C functions with variable prameters

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  • Posted by ghaberek (admin) Jun 25, 2012
  • 1379 views

I need some help from the C gurus around here. I'm a bit stumped on how to wrap a few functions I've come across.

I'm trying to wrap newt and it it seems to use a variable number of parameters on a few of its functions, like so: 

/* last item is NEWT_ARG_LAST for all of these */ 
int newtCheckboxTreeAddItem(newtComponent co,  
	    const char * text, const void * data, 
	    int flags, int index, ...);

And here's what I started with... 

x_newtCheckboxTreeAddItem = define_c_func( libnewt, "newtCheckboxTreeAddItem", 
        {C_POINTER,C_POINTER,C_POINTER,C_INT,C_INT}, C_INT )

I was thinking that I could just fill out the parameters with an inordinate series of C_INT,C_INT until the cows come home, but I'm not sure what the maximum number of parameters is. I also thought that I could re-declare the function on each call for that particular number of parameters (probably with some smart caching involved). Any ideas?

-Greg

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