#pragma inline

#include "dos.h"

struct INTERRUPT

{

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

};

void interrupt dispopen(struct INTERRUPT);

void interrupt (*prev)();

char far *vdu=(char far*)0xb8000000l;

char far *fname;

main()

{

//AIM : to display name of every file that is open when the TSR is active

unsigned long far *int21ptr;

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

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

*int21ptr=(unsigned long)dispopen;

keep(0,1000);

return 0;

}

void interrupt dispopen(struct INTERRUPT r)

{

void writestr(char far*);

if ((_AH==61)||(_AH==62)|(_AH==75))

{

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

writestr(fname);

}

asm pop bp;

asm pop di;

asm pop si;

asm pop ds;

asm pop es;

asm pop dx;

asm pop cx;

asm pop bx;

asm pop ax;

asm jmp cs:_prev;

}

void writestr(char far *fname)

{

int row,col,i;

void writechr(char,int,int,int);

row=col=10;

for(i=0;(fname[i]);i++)

{

writechr(fname[i],row,col,240);

fname++;

col++;

}

}

void writechr(char fchar,int row,int col,int attr)

{

*(vdu+(row*160)+(col*2))=fchar;

*(vdu+(row*160)+(col*2)+1)=attr;

}