//  Doubly-linked list manipulation routines.  Implemented as macros
//  but logically these are procedures.



//  VOID
//  InitializeListHead(
//      PLIST_ENTRY ListHead
//      );


#define InitializeListHead(ListHead) (\
    (ListHead)->Flink = (ListHead)->Blink = (ListHead))


//  BOOLEAN
//  IsListEmpty(
//      PLIST_ENTRY ListHead
//      );


#define IsListEmpty(ListHead) \
    ((ListHead)->Flink == (ListHead))


//  PLIST_ENTRY
//  RemoveHeadList(
//      PLIST_ENTRY ListHead
//      );


#define RemoveHeadList(ListHead) \
    (ListHead)->Flink;\
    {RemoveEntryList((ListHead)->Flink)}


//  PLIST_ENTRY
//  RemoveTailList(
//      PLIST_ENTRY ListHead
//      );


#define RemoveTailList(ListHead) \
    (ListHead)->Blink;\
    {RemoveEntryList((ListHead)->Blink)}


//  VOID
//  RemoveEntryList(
//      PLIST_ENTRY Entry
//      );


#define RemoveEntryList(Entry) {\
    PLIST_ENTRY _EX_Blink;\
    PLIST_ENTRY _EX_Flink;\
    _EX_Flink = (Entry)->Flink;\
    _EX_Blink = (Entry)->Blink;\
    _EX_Blink->Flink = _EX_Flink;\
    _EX_Flink->Blink = _EX_Blink;\
    }


//  VOID
//  InsertTailList(
//      PLIST_ENTRY ListHead,
//      PLIST_ENTRY Entry
//      );


#define InsertTailList(ListHead,Entry) {\
    PLIST_ENTRY _EX_Blink;\
    PLIST_ENTRY _EX_ListHead;\
    _EX_ListHead = (ListHead);\
    _EX_Blink = _EX_ListHead->Blink;\
    (Entry)->Flink = _EX_ListHead;\
    (Entry)->Blink = _EX_Blink;\
    _EX_Blink->Flink = (Entry);\
    _EX_ListHead->Blink = (Entry);\
    }


//  VOID
//  InsertHeadList(
//      PLIST_ENTRY ListHead,
//      PLIST_ENTRY Entry
//      );


#define InsertHeadList(ListHead,Entry) {\
    PLIST_ENTRY _EX_Flink;\
    PLIST_ENTRY _EX_ListHead;\
    _EX_ListHead = (ListHead);\
    _EX_Flink = _EX_ListHead->Flink;\
    (Entry)->Flink = _EX_Flink;\
    (Entry)->Blink = _EX_ListHead;\
    _EX_Flink->Blink = (Entry);\
    _EX_ListHead->Flink = (Entry);\
    }



//  PSINGLE_LIST_ENTRY
//  PopEntryList(
//      PSINGLE_LIST_ENTRY ListHead
//      );


#define PopEntryList(ListHead) \
    (ListHead)->Next;\
    {\
        PSINGLE_LIST_ENTRY FirstEntry;\
        FirstEntry = (ListHead)->Next;\
        if (FirstEntry != NULL) {     \
            (ListHead)->Next = FirstEntry->Next;\
        }                             \
    }



//  VOID
//  PushEntryList(
//      PSINGLE_LIST_ENTRY ListHead,
//      PSINGLE_LIST_ENTRY Entry
//      );


#define PushEntryList(ListHead,Entry) \
    (Entry)->Next = (ListHead)->Next; \
    (ListHead)->Next = (Entry)