//-------------------------------------------------------------------------
/*
Copyright (C) 1996, 2003 - 3D Realms Entertainment

This file is NOT part of Duke Nukem 3D version 1.5 - Atomic Edition
However, it is either an older version of a file that is, or is
some test code written during the development of Duke Nukem 3D.
This file is provided purely for educational interest.

Duke Nukem 3D 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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

Prepared for public release: 03/21/2003 - Charlie Wiederhold, 3D Realms
*/
//-------------------------------------------------------------------------

#ifndef __linklist_h
#define __linklist_h
#ifdef __cplusplus
extern "C" {
#endif


#define NewNode(type)  ((type*)SafeMalloc(sizeof(type)))


#define LL_CreateNewLinkedList(rootnode,type,next,prev) 			\
   { 																				\
   (rootnode) = NewNode(type);                            		\
   (rootnode)->prev = (rootnode);                         		\
   (rootnode)->next = (rootnode);                         		\
   }



#define LL_AddNode(rootnode, newnode, next, prev) 			\
   {                                              			\
   (newnode)->next = (rootnode);                  			\
   (newnode)->prev = (rootnode)->prev;                	\
   (rootnode)->prev->next = (newnode);                	\
   (rootnode)->prev = (newnode);                      	\
   }

#define LL_TransferList(oldroot,newroot,next,prev)  \
   {                                                \
   if (oldroot->prev != oldroot)                    \
      {                                             \
      oldroot->prev->next = newroot;                \
      oldroot->next->prev = newroot->prev;          \
      newroot->prev->next = oldroot->next;          \
      newroot->prev = oldroot->prev;                \
      oldroot->next = oldroot;                      \
      oldroot->prev = oldroot;                      \
      }                                             \
   }

#define LL_ReverseList(root,type,next,prev)              \
   {                                                     \
   type *newend,*trav,*tprev;                            \
                                                         \
   newend = root->next;                                  \
   for(trav = root->prev; trav != newend; trav = tprev)  \
      {                                                  \
      tprev = trav->prev;                                \
      LL_MoveNode(trav,newend,next,prev);                \
      }                                                  \
   }


#define LL_RemoveNode(node,next,prev) \
   {                                  \
   node->prev->next = node->next;     \
   node->next->prev = node->prev;     \
   node->next = node;                 \
   node->prev = node;                 \
   }


#define LL_SortedInsertion(rootnode,insertnode,next,prev,type,sortparm) \
   {                                                                    \
   type *hoya;                                                          \
                                                                        \
   hoya = rootnode->next;                                               \
   while((hoya != rootnode) && (insertnode->sortparm > hoya->sortparm)) \
      {                                                                 \
      hoya = hoya->next;                                                \
      }                                                                 \
   LL_AddNode(hoya,insertnode,next,prev);                               \
   }

#define LL_MoveNode(node,newroot,next,prev) \
   {                                        \
   LL_RemoveNode(node,next,prev);           \
   LL_AddNode(newroot,node,next,prev);      \
   }

#define LL_ListEmpty(list,next,prev) \
   (                                 \
   ((list)->next == (list)) &&       \
   ((list)->prev == (list))          \
   )

#define LL_Free(list)   SafeFree(list)
#define LL_Reset(list,next,prev)    (list)->next = (list)->prev = (list)
#define LL_New      LL_CreateNewLinkedList
#define LL_Remove   LL_RemoveNode
#define LL_Add      LL_AddNode
#define LL_Empty    LL_ListEmpty
#define LL_Move     LL_MoveNode


#ifdef __cplusplus
};
#endif
#endif
