Update Mouse OK

update_mouse_ok.c

// Credits:
// Omar Mohammad. Maadi, Cairo, Egypt. (Original in Assembly)
// Wagner Teixeira
// Fred Nora

//==================================================================================
// Start - testing update_mouse
//==================================================================================

#define MOUSE_LEFT_BTN	  0x01
#define MOUSE_RIGHT_BTN	  0x02
#define MOUSE_MIDDLE_BTN  0x04
#define MOUSE_X_SIGN	  0x10
#define MOUSE_Y_SIGN	  0x20
#define MOUSE_X_OVERFLOW  0x40
#define MOUSE_Y_OVERFLOW  0x80

long mouse_x = 0;
long mouse_y = 0;

char mouse_packet_data = 0;
char mouse_packet_x = 0;
char mouse_packet_y = 0;
char mouse_packet_scroll = 0;

/*
 * ;;=====================================================
 * ;; _update_mouse:
 * ;;     Updates the mouse position.
 * ;;
 */

void update_mouse ( void ){
	
	
//======== X ==========	
//Testando o sinal de x.
//Do the x pos first.	
do_x:
    
	//pega o delta x
    //testa o sinal para x
	
	if( mouse_packet_data & MOUSE_X_SIGN ) 
	{
	    goto x_neg;
	}
		
//Caso x seja positivo.
x_pos:
	
	mouse_x += mouse_packet_x;
	goto do_y;
	
//Caso x seja negativo.	
x_neg:
    mouse_x -= ( ~mouse_packet_x + 1 );

	if (mouse_x > 0)
	{
	    goto do_y;
	}
    mouse_x = 0;
 
//======== Y ==========	
//Testando o sinal de x. 
//Do the same for y position.	
do_y:
    
	//Pega o delta y.
    //Testa o sinal para y.
	if ( mouse_packet_data & MOUSE_Y_SIGN )
	{
	    goto y_neg;
	}
	
//Caso y seja positivo.	
y_pos:
    mouse_y -= mouse_packet_y;
	
    if ( mouse_y > 0 )
	{
        goto quit;
	}
	mouse_y = 0;
	goto quit;
		

//Caso y seja negativo. 	
y_neg:
    mouse_y += ( ~mouse_packet_y + 1 );
	
quit:	
    return;
}