#pragma inline

#include "iostream.h"

#include "dos.h"

struct INTERRUPT

{

unsigned bp,si,di,ds,es,dx,cx,bx,ax,ip,cs,fl;

};

void interrupt myshell(struct INTERRUPT);

void interrupt (*prev)();

unsigned char far *buffer;

int somelen;

main()

{

unsigned long far *int21ptr;

int21ptr=(unsigned long far*)(0x21*4);

prev=(void (interrupt far*)())*int21ptr;

*int21ptr=(unsigned long)myshell;

keep(0,1000);

return 0;

}

void interrupt myshell(INTERRUPT r)

{

// if(_AH==0x0a)

// {

buffer=(unsigned char far*)MK_FP(r.ds,r.dx);

// cout<<"\nEnter command : ";

// cin>>*buffer;

somelen=*buffer;

cout<<somelen;

// return;

// }

asm pop bp;

asm pop di;

asm pop si;

asm pop dx;

asm pop cx;

asm pop bx;

asm pop ax;

asm jmp cs:_prev;

}