static void
ofl_msg_print_flow_mod(struct ofl_msg_flow_mod *msg, FILE *stream, struct ofl_exp *exp) {
    size_t i;

    fprintf(stream, "{table=\"");
    ofl_table_print(stream, msg->table_id);
    fprintf(stream, "\", cmd=\"");
    ofl_flow_mod_command_print(stream, msg->command);
    fprintf(stream, "\", cookie=\"0x%"PRIx64"\", mask=\"0x%"PRIx64"\", "
                          "idle=\"%u\", hard=\"%u\", prio=\"%u\", buf=\"",
                  msg->cookie, msg->cookie_mask,
                  msg->idle_timeout, msg->hard_timeout, msg->priority);
    ofl_buffer_print(stream, msg->buffer_id);
    fprintf(stream, "\", port=\"");
    ofl_port_print(stream, msg->out_port);
    fprintf(stream, "\", group=\"");
    ofl_group_print(stream, msg->out_group);
    fprintf(stream, "\", flags=\"0x%"PRIx16"\", match=",msg->flags);
    ofl_structs_match_print(stream, msg->match, exp);
    fprintf(stream, ", insts=[");
    for(i=0; i<msg->instructions_num; i++) {
        ofl_structs_instruction_print(stream, msg->instructions[i], exp);
        if (i < msg->instructions_num - 1) { fprintf(stream, ", "); }
    }
    fprintf(stream, "]}");
}
char *
ofl_structs_instruction_to_string(struct ofl_instruction_header *inst, struct ofl_exp *exp) {
        char *str;
    size_t str_size;
    FILE *stream = open_memstream(&str, &str_size);
    ofl_structs_instruction_print(stream, inst, exp);
    fclose(stream);
    return str;
}
void
ofl_structs_flow_stats_print(FILE *stream, struct ofl_flow_stats *s, struct ofl_exp *exp) {
    size_t i;

    fprintf(stream, "{table=\"");
    ofl_table_print(stream, s->table_id);
    fprintf(stream, "\", match=\"");
    ofl_structs_match_print(stream, s->match, exp);
    fprintf(stream, "\", dur_s=\"%u\", dur_ns=\"%u\", prio=\"%u\", "
                          "idle_to=\"%u\", hard_to=\"%u\", cookie=\"0x%"PRIx64"\", "
                          "pkt_cnt=\"%"PRIu64"\", byte_cnt=\"%"PRIu64"\", insts=[",
                  s->duration_sec, s->duration_nsec, s->priority,
                  s->idle_timeout, s->hard_timeout, s->cookie,
                  s->packet_count, s->byte_count);

    for (i=0; i<s->instructions_num; i++) {
        ofl_structs_instruction_print(stream, s->instructions[i], exp);
        if (i < s->instructions_num - 1) { fprintf(stream, ", "); };
    }

    fprintf(stream, "]}");
}