NTSTATUS __stdcall CmListGetPrevElement(LIST_ENTRY *ListHead, LIST_ENTRY **ListIterator, INT64 FieldOffset){
LIST_ENTRY *Blink;
Blink = *ListIterator;
if( !*ListIterator )
{
Blink = ListHead->Blink;
*ListIterator = Blink;
}
if( ListHead == Blink )
return 0;
*ListIterator = Blink->Blink;
return(_DWORD)Blink - 32;
}