Write an ALP / in line code for displaying file content using root directory and FAT for floppy disk.

Write an ALP / in line code for displaying file content using root directory and FAT for floppy disk.

#include<string.h>

#include<stdio.h>

#include<conio.h>

#include<DOS.h>

typedef struct        // define a structure similar to a FAT entry

 {

  char file[8];      // file name

  char ext[3];       // file extension

  char res[15];      // rserved bits

  int fclust;        // starting cluster

  char fsize[4];     // size of file

 }ent;              // name of structure

void main()

 {

  int i,j,flag=1;

  ent a[224];            // total 224 entries array of structure

  char arr[512];         // array to store file contents

  char fn[20],ex[3];       // for acceptinf file name and extension

  int log,phy;

  clrscr();               // accept file name and extension from user

  printf("\n Enter the file name whose contents are to be read : ");

  gets(fn);

  printf("\n Enter the extension of above file : ");

  gets(ex);

// code to read all 224 entries from root directory

  asm{

    mov al,1          // drive number

    mov cx,14         // number of clusters to read

    mov dx,19         // starting cluster number

    lea bx,a           // array to store entries

    int 25h

   }

  for(i=0;i<224;i++)

   {

    for(j=0;j<8;j++)

     {

      if(a[i].file[j]==' ')

       {                        // enter null character to form a string

a[i].file[j]='\0';

       }

     }

     if(strcmpi(a[i].file,fn)==0)      // check if equal

      {

       printf("\n File name found !!");

       a[i].ext[3]='\0';

       if(strcmpi(a[i].ext,ex)==0)       // check for extension

{

printf("\n\n Extension Found !!");

flag=0;

break;              // if found then break loop i

}

       else

{

printf("\n Extension not found !!");

getch();

exit();         // else exit

}

      }

   }

  if(flag==1)

   {

    printf("\n File not found !!");

    getch();             // if unsuccessful exit

    exit();

   }

     // get logical cluster (starting cluster)

  log=a[i].fclust;

  printf("\n\n Logical cluster ( starting ) number : %d",log);

  phy=log+31;            // calculate the actual cluster (physical)

  if(phy<4095)

   {

    asm{                 // code for reading contents of cluster

      mov al,1

      mov cx,1

      mov dx,phy

      lea bx,arr

      int 25h              // print the contents of file

     }

    printf("\n\n File Contents : ");

    printf("%s",arr);

   }

  getch();

 }

/* OUTPUT

 Enter the file name whose contents are to be read : abc

 Enter the extension of above file : txt

 File name found !!

 Extension Found !!

 Logical cluster ( starting ) number : 2

 File Contents : hello...welcome to mmcoe */