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#ifndef UBI_DLINKLIST_H
#define UBI_DLINKLIST_H
/* ========================================================================== **
* ubi_dLinkList.h
*
* Copyright (C) 1997, 1998 by Christopher R. Hertel
*
* Email: crh@ubiqx.mn.org
* -------------------------------------------------------------------------- **
* This module implements simple doubly-linked lists.
* -------------------------------------------------------------------------- **
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* -------------------------------------------------------------------------- **
*
* Log: ubi_dLinkList.h,v
* Revision 0.10 1998/07/24 07:30:20 crh
* Added the ubi_dlNewList() macro.
*
* Revision 0.9 1998/06/04 21:29:27 crh
* Upper-cased defined constants (eg UBI_BINTREE_H) in some header files.
* This is more "standard", and is what people expect. Weird, eh?
*
* Revision 0.8 1998/06/03 18:06:03 crh
* Further fiddling with sys_include.h, which has been moved from the .c file
* to the .h file.
*
* Revision 0.7 1998/06/02 01:38:47 crh
* Changed include file name from ubi_null.h to sys_include.h to make it
* more generic.
*
* Revision 0.6 1998/05/20 04:38:05 crh
* The C file now includes ubi_null.h. See ubi_null.h for more info.
*
* Revision 0.5 1998/03/10 02:54:04 crh
* Simplified the code and added macros for stack & queue manipulations.
*
* Revision 0.4 1998/01/03 01:53:44 crh
* Added ubi_dlCount() macro.
*
* Revision 0.3 1997/10/15 03:04:31 crh
* Added some handy type casting to the macros. Added AddHere and RemThis
* macros.
*
* Revision 0.2 1997/10/08 03:08:16 crh
* Fixed a few forgotten link-ups in Insert(), and fixed the AddHead()
* macro, which was passing the wrong value for <After> to Insert().
*
* Revision 0.1 1997/10/07 04:34:38 crh
* Initial Revision.
*
* -------------------------------------------------------------------------- **
* This module is similar to the ubi_sLinkList module, but it is neither a
* descendant type nor an easy drop-in replacement for the latter. One key
* difference is that the ubi_dlRemove() function removes the indicated node,
* while the ubi_slRemove() function (in ubi_sLinkList) removes the node
* *following* the indicated node.
*
* ========================================================================== **
*/
#include "sys_include.h" /* System-specific includes. */
/* ========================================================================== **
* Typedefs...
*
* ubi_dlNode - This is the basic node structure.
* ubi_dlNodePtr - Pointer to a node.
* ubi_dlList - This is the list header structure.
* ubi_dlListPtr - Pointer to a List (i.e., a list header structure).
*
*/
typedef struct ubi_dlListNode
{
struct ubi_dlListNode *Next;
struct ubi_dlListNode *Prev;
} ubi_dlNode;
typedef ubi_dlNode *ubi_dlNodePtr;
typedef struct
{
ubi_dlNodePtr Head;
ubi_dlNodePtr Tail;
unsigned long count;
} ubi_dlList;
typedef ubi_dlList *ubi_dlListPtr;
/* ========================================================================== **
* Macros...
*
* ubi_dlNewList - Macro used to declare and initialize a new list in one
* swell foop. It is used when defining a variable of
* type ubi_dlList. The definition
* static ubi_dlNewList( gerbil );
* is translated to
* static ubi_dlList gerbil[1] = {{ NULL, NULL, 0 }};
*
* ubi_dlCount - Return the number of entries currently in the list.
*
* ubi_dlAddHead - Add a new node at the head of the list.
* ubi_dlAddNext - Add a node following the given node.
* ubi_dlAddTail - Add a new node at the tail of the list.
* Note: AddTail evaluates the L parameter twice.
*
* ubi_dlRemHead - Remove the node at the head of the list, if any.
* Note: RemHead evaluates the L parameter twice.
* ubi_dlRemThis - Remove the indicated node.
* ubi_dlRemTail - Remove the node at the tail of the list, if any.
* Note: RemTail evaluates the L parameter twice.
*
* ubi_dlFirst - Return a pointer to the first node in the list, if any.
* ubi_dlLast - Return a pointer to the last node in the list, if any.
* ubi_dlNext - Given a node, return a pointer to the next node.
* ubi_dlPrev - Given a node, return a pointer to the previous node.
*
* ubi_dlPush - Add a node at the head of the list (synonym of AddHead).
* ubi_dlPop - Remove a node at the head of the list (synonym of RemHead).
* ubi_dlEnqueue - Add a node at the tail of the list (sysnonym of AddTail).
* ubi_dlDequeue - Remove a node at the head of the list (synonym of RemHead).
*
* Note that all of these provide type casting of the parameters. The
* Add and Rem macros are nothing more than nice front-ends to the
* Insert and Remove operations.
*
* Also note that the First, Next and Last macros do no parameter checking!
*
*/
#define ubi_dlNewList( L ) ubi_dlList (L)[1] = {{ NULL, NULL, 0 }}
#define ubi_dlCount( L ) (((ubi_dlListPtr)(L))->count)
#define ubi_dlAddHead( L, N ) \
ubi_dlInsert( (ubi_dlListPtr)(L), (ubi_dlNodePtr)(N), NULL )
#define ubi_dlAddNext( L, N, A ) \
ubi_dlInsert( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N), \
(ubi_dlNodePtr)(A) )
#define ubi_dlAddTail( L, N ) \
ubi_dlInsert( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N), \
(((ubi_dlListPtr)(L))->Tail) )
#define ubi_dlRemHead( L ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(((ubi_dlListPtr)(L))->Head) )
#define ubi_dlRemThis( L, N ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N) )
#define ubi_dlRemTail( L ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(((ubi_dlListPtr)(L))->Tail) )
#define ubi_dlFirst( L ) (((ubi_dlListPtr)(L))->Head)
#define ubi_dlLast( L ) (((ubi_dlListPtr)(L))->Tail)
#define ubi_dlNext( N ) (((ubi_dlNodePtr)(N))->Next)
#define ubi_dlPrev( N ) (((ubi_dlNodePtr)(N))->Prev)
#define ubi_dlPush ubi_dlAddHead
#define ubi_dlPop ubi_dlRemHead
#define ubi_dlEnqueue ubi_dlAddTail
#define ubi_dlDequeue ubi_dlRemHead
/* ========================================================================== **
* Function prototypes...
*/
ubi_dlListPtr ubi_dlInitList( ubi_dlListPtr ListPtr );
/* ------------------------------------------------------------------------ **
* Initialize a doubly-linked list header.
*
* Input: ListPtr - A pointer to the list structure that is to be
* initialized for use.
*
* Output: A pointer to the initialized list header (i.e., same as
* <ListPtr>).
*
* ------------------------------------------------------------------------ **
*/
ubi_dlNodePtr ubi_dlInsert( ubi_dlListPtr ListPtr,
ubi_dlNodePtr New,
ubi_dlNodePtr After );
/* ------------------------------------------------------------------------ **
* Insert a new node into the list.
*
* Input: ListPtr - A pointer to the list into which the node is to
* be inserted.
* New - Pointer to the new node.
* After - NULL, or a pointer to a node that is already in the
* list.
* If NULL, then <New> will be added at the head of the
* list, else it will be added following <After>.
*
* Output: A pointer to the node that was inserted into the list (i.e.,
* the same as <New>).
*
* ------------------------------------------------------------------------ **
*/
ubi_dlNodePtr ubi_dlRemove( ubi_dlListPtr ListPtr, ubi_dlNodePtr Old );
/* ------------------------------------------------------------------------ **
* Remove a node from the list.
*
* Input: ListPtr - A pointer to the list from which <Old> is to be
* removed.
* Old - A pointer to the node that is to be removed from the
* list.
*
* Output: A pointer to the node that was removed (i.e., <Old>).
*
* ------------------------------------------------------------------------ **
*/
/* ================================ The End ================================= */
#endif /* UBI_DLINKLIST_H */
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