C Program for the Implementation of an Absolute Loader | CS1207 - System Software Laboratory

AIM:
To write a "C" program for the implementation of an Absolute Loader in CS1207 - System Software Lab.

SOURCE CODE:

#include<stdio.h>
#include<conio.h>
#include<string.h>
char input[10],label[10],ch1,ch2;
int addr, w=0, start, ptaddr, l, length=0, end, count=0, k, taddr, address, i=0;
FILE *fp1,*fp2;
void check();
void main()
{  clrscr();
  fp1=fopen("INPUT.dat","r");
  fp2=fopen("OUTPUT.dat","w");
  fscanf(fp1,"%s",input);
  printf("\n\n\t\t\t\tABSOLUTE LOADER\n");
  fprintf(fp2,"\n-------------------------------------------------------\n");
  fprintf(fp2,"MEMORY ADDRESS\t\t\tCONTENTS");
  fprintf(fp2,"\n-------------------------------------------------------\n");
  while(strcmp(input,"E")!=0)
  {
   if(strcmp(input,"H")==0)
   {
    fscanf(fp1,"%s %x %x %s",label,&start,&end,input);
    address=start;
   }
   else if(strcmp(input,"T")==0)
   {
    l=length;
    ptaddr=addr;
    fscanf(fp1,"%x %x %s",&taddr,&length,input);
    addr=taddr;
    if(w==0)
    {
     ptaddr=address;
     w=1;
    }
    for(k=0;k<(taddr-(ptaddr+l));k++)
    {
     address=address+1;
     fprintf(fp2,"xx");
     count++;
     if(count==4)
     {
      fprintf(fp2,"  ");
      i++;
      if(i==4)
      {
       fprintf(fp2,"\n\n%x\t\t",address);
       i=0;
      }
      count=0;
     }
    }
    if(taddr==start)
     fprintf(fp2,"\n\n%x\t\t",taddr);
    fprintf(fp2,"%c%c",input[0],input[1]);
    check();
    fprintf(fp2,"%c%c",input[2],input[3]);
    check();
    fprintf(fp2,"%c%c",input[4],input[5]);
    check();
    fscanf(fp1,"%s",input);
   }
   else
   {
    fprintf(fp2,"%c%c",input[0],input[1]);
    check();
    fprintf(fp2,"%c%c",input[2],input[3]);
    check();
    fprintf(fp2,"%c%c",input[4],input[5]);
    check();
    fscanf(fp1,"%s",input);
   }
  }
  fprintf(fp2,"\n-------------------------------------------------------\n");
  fcloseall();
  printf("\n\n The contents of output file:\n\n");
  fp2=fopen("OUTPUT.DAT","r");
  ch2=fgetc(fp2);
  while(ch2!=EOF)
  {
   printf("%c",ch2);
   ch2=fgetc(fp2);
  }
  fcloseall();
  getch();
}
void check()
{
  count++;
  address++;
  taddr=taddr+1;
  if(count==4)
  {
   fprintf(fp2,"  ");
   i++;
   if(i==4)
   {
    fprintf(fp2,"\n\n%x\t\t",taddr);
    i=0;
   }
   count=0;
  }
}

INPUT FILE:

INPUT.DAT
H COPY 001000 00107A
T 001000 1E 141033 482039 001036 281030 301015 482061 3C1003 00102A 0C1039 00102D
T 00101E 15 0C1036 482061 081033 4C0000 454F46 000003 000000
T 001047 1E 041030 001030 E0205D 30203F D8205D 281030 302057 549039 2C205E 38203F
T 001077 1C 101036 4C0000 000000 001000 041030 E02079 302064 509039 DC2079 2C1036
E 001000

OUTPUT:

Related Posts:

• IMPLEMENTATION OF A SYMBOL TABLE
• IMPLEMENTATION OF PASS ONE OF A TWO PASS ASSEMBLER

• IMPLEMENTATION OF PASS TWO OF A TWO PASS ASSEMBLER

• IMPLEMENTATION OF A SINGLE PASS ASSEMBLER

• IMPLEMENTATION OF A MACRO PROCESSOR

• IMPLEMENTATION OF A ABSOLUTE LOADER

• IMPLEMENTATION OF A RELOCATING LOADER

• IMPLEMENTATION OF PASS ONE OF A DIRECT-LINKING LOADER 

• IMPLEMENTATION OF PASS TWO OF A DIRECT-LINKING LOADER

• IMPLEMENTATION OF A SIMPLE TEXT EDITOR

• Twitter
• Facebook
• Google
• Tumblr
• Pinterest