tx_cmd_value
int tx_cmd_value(tx_commit_data_t *, size_t, uint32_t, const char **);
if (tx_cmd_value(tx_data, cmd_no, 0, &value) != REP_PROTOCOL_SUCCESS)
if (tx_cmd_value(tx_data, cmd_no, i, &cur_value) !=
if (tx_cmd_value(tx_data, cmd_no, i, &cur_value) !=