[SOLVED]C pointer question

I'm having a terrible time tracking down what exactly the issue is here in my code. To me, at first it seemed like a simple missed assignment, but after tinkering in gdb I realize there is something deeper going on here that I don't understand.
Here is the local function in which the problem occurs.
static void
CountryStorageinsert(void *self, void *data){
if (self = 0)
return;
CountryStorage *rs = (CountryStorage *) self;
Record *r = (Record *) data;
rs->countries[r->id] = r;
if (r->id > rs->maxid)
rs->maxid = r->id;
rs->nrecords++;
The issue is that no matter what the value the void *self is passed in with, the assignment to *rs is ALWAYS zero. Additionally in my project there are three such functions, CountryStorageinit, CountryStorageinsert, CountryStoragebackup which all have similar constructs all have the same problem. I can not seem to pass in a void pointer and cast it to a compound structure pointer.
What is even more puzzling is I can manually, in gdb, get the behaviour I originally expected this code to have. That is I can "(gdb) set rs = (CountryStorage *) self" and then examine rs, and vioala it has the address that self contained in the function parameters.
I would really appreciate it if someone could tell me if my thoughts on how pointer coercion works are wrong.
Thanks.
Last edited by ickabob (2011-10-23 17:55:11)

Classic C mistake;
if (self = 0)
as opposed to
if (self == 0)

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