Write a program in C++ to develop a tool using GRUB2 or GRUBx64.rfi select and display a boot partition. (use appropriate overloading)

GRUB.cpp

#include "stdio.h"
#include "stdlib.h"
#include "unistd.h"
#include "fcntl.h"
#include "iostream"
#include "iomanip"
using namespace std;

struct partition
{
    unsigned char boot_flag;        /* 0 = Not active, 0x80 = Active */
    unsigned char chs_begin[3];
    unsigned char sys_type;         /* For example : 82 --> Linux swap, 83 --> Linux native partition, ... */
    unsigned char chs_end[3];
    unsigned char start_sector[4];
    unsigned char nr_sector[4];
};

void string_in_hex(void *in_string, int in_string_size)
{
    for (int i = 0; i < in_string_size; i++)
    {
        printf("%02x", ((char *)in_string)[i]& 0xFF);
    }
}

void dump_partition(struct partition *part, int partition_number, string dev)
{
    cout<<endl<<"\t";
    cout<<dev;
    
    printf("%d\t", partition_number + 1);
        
    if(part->boot_flag == 0x80){
        printf("%02x *\t\t", part->boot_flag);
    }
    else if(part->boot_flag == 0x00){
        printf("%02x\t\t", part->boot_flag);
    }
        
    printf("%02x\t", part->sys_type);
            
    if (part->sys_type == 0x07){    
        cout<<"HPFS/NTFS/exFAT\t\t";
    }
    else if (part->sys_type == 0x05){
        cout<<"Extended       \t\t";
    }
    else if (part->sys_type == 0x83){
        cout<<"Linux EXT4/EXT3\t\t";
    }
    else if (part->sys_type == 0x82){
        cout<<"Linux swap     \t\t";
    }
    else{
        cout<<"OTHER          \t\t";
    }    
            
    string_in_hex(part->chs_begin, 3); 
    printf("\t\t");
    
    string_in_hex(part->chs_end, 3);
    printf("\t\t");
        
    string_in_hex(part->start_sector, 4);    
    printf("\t");
    
    string_in_hex(part->nr_sector, 4);
}

int main(int argc, char *argv[])
{
    cout.setf(ios::left, ios::adjustfield);
    
    char buf[512];
        struct partition *sp;
    
    if(argc != 2){

        cout<<"Improper number of arguments\n";
        exit(1);
    }

    int fd = open(argv[1], 'r');
    
    if (fd == -1)
        {
                cout<<"cannot open file "<<argv[1]<<" !!!!!!!!!!!!!\n";
                exit(1);
        }
    
    read(fd, buf, sizeof(buf));

    close(fd);

        cout<<"\n\t***************************************************************************\n";
        cout<<"\t\t\t\t\t\t\tPRIMARY PARTITIONS OF "<<argv[1]<<endl;
        cout<<"\t***************************************************************************\n\n";
        
        cout<<"\t"<<setw(16)<<"Partiton"<<setw(16)<<"Boot Flag"<<setw(8)<<"Id"<<setw(24)<<"System"<<setw(16)<<"chs_begin"<<setw(16)<<"chs_end"<<setw(16)<<"start_sector"<<setw(16)<<"nr_sector\n\n";


        for (int i = 0 ; i < 4 ; i++)
        {
                sp = (struct partition *)(buf + 446 + (16 * i));
                
                dump_partition(sp, i, argv[1]);
        }
    
    cout<<"\n\n";
    cout<<"\t-----------------------------------------------------------------\n";
    cout<<"\t* : partition is bootable\n";
    cout<<"\t------------------------------------------------------------------\n";
        return 0;
}