C program to check if mouse support is available or not

int initmouse();

union REGS i, o;

main()
{
   int status;

   status = initmouse();

   if (status == 0)
      printf("Mouse support not available.\n");
   else
      printf("Mouse support available.\n");

   getch();
   return 0;
}

int initmouse()
{
   i.x.ax = 0;
   int86(0X33, &i, &o);
   return (o.x.ax);
}