Create Doubly Linked list from singly Linked List

BOOLEAN ddrv_CreateDoublyLinkedList( SPEED_DEVICE_EXTENSION * apDevExt )

{

DEFRAGFILE * lpFileList = apDevExt->mpFileList;

DEFRAGFILE * lpPrevFile = NULL;

if ( lpFileList != NULL )

{

lpFileList->mPrevPtr = NULL;

lpPrevFile = lpFileList;

lpFileList = lpFileList->mNextPtr;

}

while( lpFileList != NULL )

{

lpFileList->mPrevPtr = lpPrevFile;

lpPrevFile = lpFileList;

lpFileList = lpFileList->mNextPtr;

}

return TRUE;

}