get_za
if (!get_za(child, (void **)&new_za, &new_za_size)) {
if (!get_za(child, (void **)&read_buf, &read_za_size)) {
if (!get_za(child, (void **)&read_buf, &read_za_size)) {
if (get_za(child, (void **)&za_out, &za_out_size)) {