PurpleBuddy & PurpleBlistNode struct confusion

[ciciak c.]

 Hi guys,

 I would like to ask you about 2 structs: PurpleBuddy & PurpleBlistNode. For clarity, I describe them shortly:

struct _PurpleBlistNode {
   ....
}

struct _PurpleBuddy {
    PurpleBlistNode node; // PurpleBlistNode is _PurpleBlistNode macro
    char *name;
    ...
}

So far so good. But I found code which actually works! It is like: 

static void blist_node_extended_menu_cb(PurpleBlistNode *node, void *data)
{
    PurpleBuddy *b = (PurpleBuddy *)node
    // so calling something to get string like b->name will work!!
    ....
}
   
Please, how can I cast type PurpleBlistNode to type PurpleBuddy. Or am I missing something here?
Thank You


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