Swap pointers in list

[response]

Hello,
I have a problem. I have list and I would like swap pointers. How to do? The A pointer is head.

  if (A != head)
{
	prevA->next = B;
	prevB->next = A;

	temp = B->next;
	B->next = A->next;
	A->next = temp;
}
else if (A == head)
{
     //??????????????
}