Initial community commit

Src/nde/LinkedList.cpp

@@ -0,0 +1,126 @@
+/* ---------------------------------------------------------------------------
+Nullsoft Database Engine
+--------------------
+codename: Near Death Experience
+--------------------------------------------------------------------------- */
+
+/* ---------------------------------------------------------------------------
+
+Double-Linked List Class
+
+Caution: The entire library relies on this base class. Modify with care!
+
+--------------------------------------------------------------------------- */
+
+#include "nde.h"
+#include "LinkedList.h"
+//---------------------------------------------------------------------------
+LinkedListEntry *LinkedListEntry::GetNext(void)  const
+{
+	return Next;
+}
+
+//---------------------------------------------------------------------------
+LinkedListEntry *LinkedListEntry::GetPrevious(void)  const
+{
+	return Previous;
+}
+
+//---------------------------------------------------------------------------
+LinkedListEntry::LinkedListEntry()
+{
+	//Int=0;
+	Next=NULL;
+	Previous=NULL;
+}
+
+//---------------------------------------------------------------------------
+LinkedListEntry::~LinkedListEntry()
+{
+}
+
+
+//---------------------------------------------------------------------------
+LinkedList::LinkedList()
+{
+	Head = NULL;
+	Foot = NULL;
+	NElements=0;
+}
+
+//---------------------------------------------------------------------------
+LinkedList::~LinkedList()
+{
+	while (Head)
+		RemoveEntry(Head);
+}
+
+//---------------------------------------------------------------------------
+void LinkedList::AddEntry(LinkedListEntry *Entry, bool Cat)
+{
+#ifdef WIN32
+	//EnterCriticalSection(&Critical);
+#endif
+	if (!Cat)
+	{
+		if (Head)
+			Head->Previous = Entry;
+		Entry->Next = Head;
+		Entry->Previous = NULL;
+		Head = Entry;
+		if (!Foot)
+			Foot = Entry;
+	}
+	else
+	{
+		if (Foot)
+			Foot->Next = Entry;
+		Entry->Previous = Foot;
+		Entry->Next = NULL;
+		Foot = Entry;
+		if (!Head)
+			Head = Entry;
+	}
+	NElements++;
+#ifdef WIN32
+	//LeaveCriticalSection(&Critical);
+#endif
+}
+
+//---------------------------------------------------------------------------
+void LinkedList::RemoveEntry(LinkedListEntry *Entry)
+{
+	if (!Entry) return;
+#ifdef WIN32
+	//EnterCriticalSection(&Critical);
+#endif
+	if (Entry->Next)
+		Entry->Next->Previous = Entry->Previous;
+	else
+		Foot = Entry->Previous;
+	if (Entry->Previous)
+		Entry->Previous->Next = Entry->Next;
+	else
+		Head = Entry->Next;
+
+	if (NElements > 0)
+	{
+		delete Entry;
+		NElements--;
+	}
+#ifdef WIN32
+	//LeaveCriticalSection(&Critical);
+#endif
+}
+
+//---------------------------------------------------------------------------
+void LinkedList::WalkList(WalkListProc WalkProc, int ID, void *Data1, void *Data2)
+{
+	if (!WalkProc) return;
+	LinkedListEntry *Entry = Head;
+	while (Entry)
+	{
+		if (!WalkProc(Entry, ID, Data1, Data2)) break;
+		Entry = Entry->Next;
+	}
+}