find_atype
struct addr_operations *a = find_atype(addr->addr_type);
a = find_atype(addr1->addr_type);
a = find_atype(addr2->addr_type);
struct addr_operations *a = find_atype (address->addr_type);
struct addr_operations *a = find_atype (inaddr->addr_type);
struct addr_operations *a = find_atype(addr->addr_type);