snmpEngineBoots & snmpEngineID数据存储到非易失性存储设备

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int regenerateID()
{
    return ;
}

int read_snmpEngine_file(char* file_name, int* snmpEngineBoots, int* snmpEngineID)
{
    FILE* fp;
    fp = fopen(file_name, "r");
    fscanf(fp, "%d, %d", snmpEngineBoots, snmpEngineID);
    fclose(fp);
    return ;
}

int update_snmpEngine_file(char* file_name, int* snmpEngineBoots, int* snmpEngineID)
{
    FILE* fp;
    fp = fopen(file_name, "w+");
    fprintf(fp, "%d, %d", *snmpEngineBoots + , *snmpEngineID);
    fclose(fp);
}

int get_snmpEngine_data(char* file_name, int* snmpEngineBoots, int* snmpEngineID)
{
    FILE* fp;
    fp = fopen(file_name, "r");
    if(fp == NULL)
    {
        *snmpEngineBoots = ;
        *snmpEngineID = regenerateID();
    }
    else
    {
        fclose(fp);
        read_snmpEngine_file(file_name, snmpEngineBoots, snmpEngineID);
    }
    remove(file_name);
    update_snmpEngine_file(file_name, snmpEngineBoots, snmpEngineID);
    return ;
}

int main()
{
    char* file_name = "snmp_engine.cfg";
    int snmpEngineID = , snmpEngineBoots = ;
    get_snmpEngine_data(file_name, &snmpEngineBoots, &snmpEngineID);
    printf("%d %d\n", snmpEngineBoots, snmpEngineID);

}