source: protocols/oscar/buddylist.c @ b3ebb3a

#include <aim.h>
#include "buddylist.h"

/*
 * Oncoming Buddy notifications contain a subset of the
 * user information structure.  Its close enough to run
 * through aim_extractuserinfo() however.
 *
 * Although the offgoing notification contains no information,
 * it is still in a format parsable by extractuserinfo.
 *
 */
static int buddychange(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_userinfo_t userinfo;
        aim_rxcallback_t userfunc;

        aim_extractuserinfo(sess, bs, &userinfo);

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                return userfunc(sess, rx, &userinfo);
        }

        return 0;
}

static int rights(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_rxcallback_t userfunc;
        aim_tlvlist_t *tlvlist;
        guint16 maxbuddies = 0, maxwatchers = 0;
        int ret = 0;

        /*
         * TLVs follow
         */
        tlvlist = aim_readtlvchain(bs);

        /*
         * TLV type 0x0001: Maximum number of buddies.
         */
        if (aim_gettlv(tlvlist, 0x0001, 1)) {
                maxbuddies = aim_gettlv16(tlvlist, 0x0001, 1);
        }

        /*
         * TLV type 0x0002: Maximum number of watchers.
         *
         * Watchers are other users who have you on their buddy
         * list.  (This is called the "reverse list" by a certain
         * other IM protocol.)
         *
         */
        if (aim_gettlv(tlvlist, 0x0002, 1)) {
                maxwatchers = aim_gettlv16(tlvlist, 0x0002, 1);
        }

        /*
         * TLV type 0x0003: Unknown.
         *
         * ICQ only?
         */

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess, rx, maxbuddies, maxwatchers);
        }

        aim_freetlvchain(&tlvlist);

        return ret;
}

static int snachandler(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{

        if (snac->subtype == 0x0003) {
                return rights(sess, mod, rx, snac, bs);
        } else if ((snac->subtype == 0x000b) || (snac->subtype == 0x000c)) {
                return buddychange(sess, mod, rx, snac, bs);
        }

        return 0;
}

int buddylist_modfirst(aim_session_t *sess, aim_module_t *mod)
{

        mod->family = 0x0003;
        mod->version = 0x0001;
        mod->toolid = 0x0110;
        mod->toolversion = 0x0629;
        mod->flags = 0;
        strncpy(mod->name, "buddylist", sizeof(mod->name));
        mod->snachandler = snachandler;

        return 0;
}