Cau2De2

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

struct BOOT {  //for FAT16
    char jmp[3];
    char OEM[8];
    int bytes_per_sector;
    char sectors_per_cluster;
    int reserved;
    char FAT_cnt;
    int ROOT_size;
    int total_sectors;
    char media;
    int FAT_size;
    int sectors_per_track;
    int head_cnt;
    long hidden_sectors;
    long total_sectors_long;
    char unknown[3];
    long serial;
    char volume[11];
    char FAT_type[8];
    char loader[448];
    char mark[2];
};

struct ROOT {
    char name[8];
    char ext[3];
    char attr;
    char reserved[10];
    char time[2];
    char date[2];
    int first_cluster;
    long size;
};

void main()
{
    int i;
    int drive = 3;
    BOOT boot;

    int res = absread(drive, 1, 0, &boot);
    unsigned int *fat = (unsigned int *)malloc (boot.FAT_size * boot.bytes_per_sector);


    res = absread(drive, boot.FAT_size, boot.reserved, fat);

    unsigned int n = 5;
    unsigned int cur = n;

    int num_byte = boot.ROOT_size * 32;

    ROOT *root = (ROOT *)malloc(num_byte);
    if(root == NULL) return;

    int num_sector = num_byte / boot.bytes_per_sector;
    int root_begin = boot.reserved + boot.FAT_size * boot.FAT_cnt;

    res = absread(drive, num_sector, root_begin, (void *)root);


    printf("2. Tim 1 file co ten cho truoc va so thu tu cluster dau tien cua file do\n");
    int k;
    char str[9];
    int first_cluster = -1;
    for(i = 0; i < boot.ROOT_size; i++){
        for(k = 0; k < 8 && root[i].name[k] != ' '; k++)
            str[k] = root[i].name[k];
        str[k] = 0;
        char filename[8];
        printf("\n Enter a file name:");
        scanf("%s",filename);

        if(strcmp(str, filename) == 0){
            first_cluster = root[i].first_cluster;
            break;
        }
    }
    printf("So thu tu cluster dau tien %d", first_cluster);



    free(root);
    free(fat);

    getchar();
}