PinChangeInt library- To attach interrupts to multiple Arduino (Uno/Mega) pins

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from the 2.01 beta?

void PCintPort::addPin(uint8_t arduinoPin, uint8_t mode,PCIntvoidFuncPtr userFunc)
{
	// Create pin p:  fill in the data.  This is no longer in another method (saves some bytes).
	PCintPin* p=new PCintPin;
	p->arduinoPin=arduinoPin;
	p->mode = mode;
	p->next=NULL;
	p->mask = digitalPinToBitMask(arduinoPin); // the mask

#ifdef DEBUG
	Serial.print("createPin. pin given: "); Serial.print(arduinoPin, DEC);
	int addr = (int) p;
	Serial.print(" instance addr: "); Serial.println(addr, HEX);
	Serial.print("userFunc addr: "); Serial.println((int)p->PCintFunc, HEX);
#endif

	// pin created

	if (p == NULL) return;

The test for p == NULL should be directly after PCintPin* p=new PCintPin;
as one cannot access the members of p when p == NULL

void PCintPort::detachInterrupt(uint8_t arduinoPin)
{
	PCintPort *port;
#ifdef DEBUG
	Serial.print("detachInterrupt: "); Serial.println(arduinoPin, DEC);
#endif
	uint8_t portNum = digitalPinToPort(arduinoPin);
	if (portNum == NOT_A_PORT) return;
	port=lookupPortNumToPort(portNum);
        if (port == NULL)                                             // <<<<<<<<<<<<<<<<<<<<<<< handle error? from code point it is possible.
	port->delPin(digitalPinToBitMask(arduinoPin));
}