dprintf_dbuf
dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);
dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);
dprintf_dbuf(db, "db=%p\n", db);
dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \