[Devel] module coding question, are optional arguments set to null by default?

[Ron Winacott]

Hello all,
	I have a question about the module C function arguments. After you map the 
route function to the module C function, the C function has three arguments, 
the struct sip_msg* msg, char* str1 and char* str2. 

So my question is, if the routing function is called without passing any 
arguments will str1 and str2 be NULL or are they pointing at "junk on the 
stack"?

I would like to create a function that has an optional flag that may or may 
not be passed as str1 and the code would look something like:

module:
static cmd_export_t commands[] = {
	{"route_fubar",   fubar,   1,  0, REQUEST_ROUTE },
	{0, 0, 0, 0, 0}
};

static int
fubar(struct sip_msg* msg, char* str1, char* str2) {
	if (str1) {
		do_optional_stuff()
	}
	...
}

ser.cfg :
if (method=="INVITE") {
	fubar("flag");
}
else {
	fubar();
}

Thanks
	ronw.

-- 
Ron Winacott ronw at somanetworks.com
SOMA Networks, Inc.