get_data
get_data(in, version, &princ->realm);
get_data(in, version, &princ->data[i]);
get_data(&in, version, &creds->ticket);
get_data(&in, version, &creds->second_ticket);
get_data(pp, lenp, &ka->ka_addr);
get_data(pp, lenp, &kk->kk_key);
get_data(&p, &len, &kc->kc_source_name);
get_data(&p, &len, &kc->kc_target_name);
get_data##x(void *data, size_t len, void *ctx) {\