Added Force Quit to intcode processor

2019/intcode-processor/processor.go

@@ -44,6 +44,7 @@ type Program struct {
 	state int
 	error error
 
+	bail             bool
 	waitingForInput  bool
 	input            chan int
 	waitingForOutput bool
@@ -113,6 +114,12 @@ func (p *Program) Error() error {
 	return p.error
 }
 
+func (p *Program) ForceQuit() {
+	p.bail = true
+	close(p.input)
+	close(p.output)
+}
+
 func (p *Program) Run() int {
 	for {
 		p.state = p.Step()
@@ -123,6 +130,10 @@ func (p *Program) Run() int {
 }
 
 func (p *Program) Step() int {
+	if p.bail {
+		p.error = errors.New("Force Quit")
+		return RET_ERR
+	}
 	if len(p.code) < p.ptr {
 		p.error = errors.New("Pointer Exception")
 		return RET_ERR