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This code manages a simple doubly-linked list.

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This commit is contained in:
Christopher R. Hertel 0001-01-01 00:00:00 +00:00
parent 4691a94d3c
commit a88ae60fc3
2 changed files with 324 additions and 0 deletions
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146
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/* ========================================================================== **
* ubi_dLinkList.c
*
* Copyright (C) 1997 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.
*
* -------------------------------------------------------------------------- **
*
* Revision 0.3 1997/10/15 03:05:39 crh
* Added some handy type casting to the macros. Added AddHere and RemThis
* macros.
*
* Revision 0.2 1997/10/08 03:07:21 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 04:34:07 crh
* Initial Revision.
*
*
* ========================================================================== **
*/
#include "ubi_dLinkList.h"
/* ========================================================================== **
* Functions...
*/
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>).
*
* ------------------------------------------------------------------------ **
*/
{
ListPtr->Head = NULL;
ListPtr->Tail = NULL;
ListPtr->count = 0;
return( ListPtr );
} /* ubi_dlInitList */
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>).
*
* ------------------------------------------------------------------------ **
*/
{
if( NULL == After )
{
New->Next = ListPtr->Head;
New->Prev = NULL;
if( NULL != ListPtr->Head )
ListPtr->Head->Prev = New;
else
ListPtr->Tail = New;
ListPtr->Head = New;
}
else
{
New->Next = After->Next;
New->Prev = After;
if( NULL != After->Next )
After->Next->Prev = New;
else
ListPtr->Tail = New;
After->Next = New;
}
++(ListPtr->count);
return( New );
} /* ubi_dlInsert */
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>).
*
* ------------------------------------------------------------------------ **
*/
{
if( NULL != Old )
{
if( Old->Next )
Old->Next->Prev = Old->Prev;
else
ListPtr->Tail = Old->Prev;
if( Old->Prev )
Old->Prev->Next = Old->Next;
else
ListPtr->Head = Old->Next;
--(ListPtr->count);
}
return( Old );
} /* ubi_dlRemove */
/* ================================ The End ================================= */

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source/ubi_dLinkList.h Normal file
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#ifndef ubi_dLinkList_H
#define ubi_dLinkList_H
/* ========================================================================== **
* ubi_dLinkList.h
*
* Copyright (C) 1997 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.
*
* -------------------------------------------------------------------------- **
*
* 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.
*
*
* ========================================================================== **
*/
#include <stdlib.h>
/* ========================================================================== **
* 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_dlAddHead - Add a new node at the head of the list.
* ubi_dlAddTail - Add a new node at the tail of the list.
* ubi_dlAddHere - Add a node following the given node.
* ubi_dlRemHead - Remove the node at the head of the list, if any.
* ubi_dlRemTail - Remove the node at the tail of the list, if any.
* ubi_dlRemThis - Remove the indicated node.
* 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.
*
* 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.
*
*/
#define ubi_dlAddHead( L, N ) \
ubi_dlInsert( (ubi_dlListPtr)(L), (ubi_dlNodePtr)(N), NULL )
#define ubi_dlAddTail( L, N ) \
ubi_dlInsert( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N), \
(((ubi_dlListPtr)(L))->Tail) )
#define ubi_dlAddHere( L, N, P ) \
ubi_dlInsert( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N), \
(ubi_dlNodePtr)(P) )
#define ubi_dlRemHead( L ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(((ubi_dlListPtr)(L))->Head) )
#define ubi_dlRemTail( L ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(((ubi_dlListPtr)(L))->Tail) )
#define ubi_dlRemThis( L, N ) ubi_dlRemove( (ubi_dlListPtr)(L), \
(ubi_dlNodePtr)(N) )
#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)
/* ========================================================================== **
* 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 */