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#ifndef ubi_sLinkList_H
#define ubi_sLinkList_H
/* ========================================================================== **
* ubi_sLinkList.h
*
* Copyright (C) 1997 by Christopher R. Hertel
*
* Email: crh@ubiqx.mn.org
* -------------------------------------------------------------------------- **
* This module implements a really simple singly-linked list.
* -------------------------------------------------------------------------- **
*
* 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 0.2 1997/10/21 03:36:14 crh
* Added parameter <After> in function Insert(). Made necessary changes
* to macro AddHead() and added macro AddHere().
*
* Revision 0.1 1997/10/16 02:54:08 crh
* Initial Revision.
*
* ========================================================================== **
*/
#include <stdlib.h>
/* ========================================================================== **
* Typedefs...
*
* ubi_slNode - This is the basic node structure.
* ubi_slNodePtr - Pointer to a node.
* ubi_slList - This is the list header structure.
* ubi_slListPtr - Pointer to a List (i.e., a list header structure).
*
*/
typedef struct ubi_slListNode
{
struct ubi_slListNode *Next;
} ubi_slNode;
typedef ubi_slNode *ubi_slNodePtr;
typedef struct
{
ubi_slNodePtr Head;
unsigned long count;
} ubi_slList;
typedef ubi_slList *ubi_slListPtr;
/* ========================================================================== **
* Macros...
*
* ubi_slAddHead - Add a new node at the head of the list.
* ubi_slRemHead - Remove the node at the head of the list, if any.
* ubi_slFirst - Return a pointer to the first node in the list, if any.
* ubi_slNext - Given a node, return a pointer to the next 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_slAddHead( L, N ) \
ubi_slInsert( (ubi_slListPtr)(L), (ubi_slNodePtr)(N), NULL )
#define ubi_slAddHere( L, N, P ) \
ubi_slInsert( (ubi_slListPtr)(L), \
(ubi_slNodePtr)(N), \
(ubi_slNodePtr)(P) )
#define ubi_slRemHead( L ) ubi_slRemove( (ubi_slListPtr)(L) )
#define ubi_slFirst( L ) (((ubi_slListPtr)(L))->Head)
#define ubi_slNext( N ) (((ubi_slNodePtr)(N))->Next)
/* ========================================================================== **
* Function prototypes...
*/
ubi_slListPtr ubi_slInitList( ubi_slListPtr ListPtr );
/* ------------------------------------------------------------------------ **
* Initialize a singly-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_slNodePtr ubi_slInsert( ubi_slListPtr ListPtr,
ubi_slNodePtr New,
ubi_slNodePtr After );
/* ------------------------------------------------------------------------ **
* Insert a new node at the head of the list.
*
* Input: ListPtr - A pointer to the list into which the node is to
* be inserted.
* New - Pointer to the node that is to be added to the list.
* After - Pointer to a list in a node after which the new node
* will be inserted. If NULL, then the new node will
* be added at the head of the list.
*
* Output: A pointer to the node that was inserted into the list (i.e.,
* the same as <New>).
*
* ------------------------------------------------------------------------ **
*/
ubi_slNodePtr ubi_slRemove( ubi_slListPtr ListPtr );
/* ------------------------------------------------------------------------ **
* Remove a node from the head of the list.
*
* Input: ListPtr - A pointer to the list from which the node is to be
* removed.
*
* Output: A pointer to the node that was removed.
*
* ------------------------------------------------------------------------ **
*/
/* ================================ The End ================================= */
#endif /* ubi_sLinkList_H */
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