Listing 4. Mouse Code

	vga_setmousesupport(1);


	int mouse;
	union REGS regs;

	regs.x.ax = 0;
	int86(0x33, ®s, ®s);
	mouse_on = regs.x.ax;

	if (!mouse_on) {
		printf(
"\nMouse initialization failed!\n");
		exit(1);
	}


	int mouse_x, mouse_y;
	while(1) {
		mouse_update();
		mouse_x = mouse_getx();
		mouse_y = mouse_gety();
		printf("\nCurrent mouse X: %d",
			 mouse_x);
		printf("\nCurrent mouse Y: %d",
			 mouse_y);
		if ((mouse_getbutton()) == 0)
			..... ;
			/* neither mouse button is down */
		if (((mouse_getbutton() & 
			MOUSE_LEFTBUTTON)) &&
		((mouse_getbutton() & 
			MOUSE_RIGHTBUTTON)))
			..... ;
			/* both mouse buttons are down */
		if ((mouse_getbutton()) & 
			MOUSE_LEFTBUTTON &&
		   !(mouse_getbutton()) & 
			MOUSE_RIGHTBUTTON))
			..... ;
			/* left mouse button is down */
		if ((mouse_getbutton()) & MOUSE_RIGHTBUTTON &&
		   !(mouse_getbutton()) & MOUSE_LEFTBUTTON))
			..... ;
			/* right mouse button is down */
	}


	int mouse_x, mouse_y;
	while(1) {
		get_mouse_status (&mouse_x, &mouse_y);
		printf("\nCurrent mouse X: %d", mouse_x);
		printf("\nCurrent mouse Y: %d", mouse_y);
		if ((get_buttons_mouse_status()) == 0)
			..... ;
			/* neither mouse button is down */
		if (get_buttons_mouse_status() == 3)
			..... ;
			/* both mouse buttons are down */
		if ((get_buttons_mouse_status()) == 1)
			..... ;
			/* left mouse button is down */
		if ((get_buttons_mouse_status()) == 2)
			..... ;
			/* right mouse button is down */
	}
	void get_mouse_status (int *x, int *y)
	{
	        regs.x.ax = 3;
        	int86(0x33, ®s, ®s);
	        *x = regs.x.cx;
        	*y = regs.x.dx;
	}
	int get_buttons_mouse_status(void)
	{
        	regs.x.ax=3;
	        int86(0x33, ®s, ®s);
        	return regs.x.bx;
	}