The GtkRadiant sources as originally released under the GPL license.

tools/quake2/qdata_heretic2/qcommon/arrayedlist.h

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+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _ARRAYEDLIST_H
+#define _ARRAYEDLIST_H
+
+#include <assert.h>
+
+typedef struct ArrayedListNode_s
+{
+	int data;
+	int next;
+	int inUse;
+} ArrayedListNode_t;
+
+#define ARRAYEDLISTNODE_NULL -1
+
+static 
+#ifdef _WIN32
+  _inline
+#else
+  inline
+#endif  
+  int GetFreeNode(ArrayedListNode_t *nodeArray, int max)
+{
+	int i;
+
+	for(i = 0; i < max; ++i)
+	{
+		if(!nodeArray[i].inUse)
+		{
+			nodeArray[i].inUse = 1;
+			return i;
+		}
+	}
+
+	assert(0);
+	return -1;
+}
+
+static 
+#ifdef _WIN32
+  _inline
+#else
+  inline
+#endif
+void FreeNode(ArrayedListNode_t *nodeArray, int index)
+{
+	nodeArray[index].inUse = 0;
+}
+
+#endif //_ARRAYEDLIST_H
+