insertAt front in a duobly linked list

[gladi]

Hi Everyone,
I tried to insert a node at front in doubly linked list and I think I did the first part when the list isEmpty(). But the second part I was trying from yesterday but I did not get it.

  void List< NODETYPE >::insertAtFront( const NODETYPE &value )
{
   ListNode< NODETYPE > *newPtr = getNewNode( value ); // new node
  // ListNode< NODETYPE > *current 

   if ( isEmpty() ) // List is empty
	   {
		  
		  firstPtr = newPtr;
		  lastPtr = newPtr;
		  newPtr ->nextPtr = NULL;
		  newPtr ->prevPtr = NULL;
		  newPtr ->data = value;
	   }
	   // new list has only one node
   else // List is not empty
     {
	 ListNode< NODETYPE > *newNode = firstPtr;
		  
	     while ( newNode ->nextPtr != lastPtr->nextPtr)
		  newNode = newNode ->nextPtr;

		 if(newNode == firstPtr)
			{
					
				newNode ->nextPtr = firstPtr->nextPtr;
				newNode ->prevPtr = NULL;
				firstPtr = newNode;
				newNode ->data = value;
			}

      } // end else
} // end function insertAtFront 

Your help is highly appreciated.

[writetonsharma]

Why do you have to go till end for adding in front of the linked list.

will something like this not work ?

newPtr->next = firstptr;
newPtr->prev = null;
firstptr->prev = newPtr;
firstptr = newPtr;