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/* $OpenBSD: lstInt.h,v 1.6 1998/12/05 00:06:32 espie Exp $ */
/* $NetBSD: lstInt.h,v 1.7 1996/11/06 17:59:44 christos Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)lstInt.h 8.1 (Berkeley) 6/6/93
*/
/*-
* lstInt.h --
* Internals for the list library
*/
#ifndef _LSTINT_H_
#define _LSTINT_H_
#include "make.h"
#include "lst.h"
typedef struct ListNode {
struct ListNode *prevPtr; /* previous element in list */
struct ListNode *nextPtr; /* next in list */
short useCount:8, /* Count of functions using the node.
* node may not be deleted until count
* goes to 0 */
flags:8; /* Node status flags */
ClientData datum; /* datum associated with this element */
} *ListNode;
/*
* Flags required for synchronization
*/
#define LN_DELETED 0x0001 /* List node should be removed when done */
#define NilListNode ((ListNode)-1)
typedef enum {
Head, Middle, Tail, Unknown
} Where;
typedef struct {
ListNode firstPtr; /* first node in list */
ListNode lastPtr; /* last node in list */
Boolean isCirc; /* true if the list should be considered
* circular */
/*
* fields for sequential access
*/
Where atEnd; /* Where in the list the last access was */
Boolean isOpen; /* true if list has been Lst_Open'ed */
ListNode curPtr; /* current node, if open. NilListNode if
* *just* opened */
ListNode prevPtr; /* Previous node, if open. Used by
* Lst_Remove */
} *List;
#define NilList ((List)-1)
/*
* PAlloc (var, ptype) --
* Allocate a pointer-typedef structure 'ptype' into the variable 'var'
*/
#define PAlloc(var,ptype) var = (ptype) emalloc (sizeof (*var))
/*
* LstValid (l) --
* Return TRUE if the list l is valid
*/
#define LstValid(l) (((Lst)l == NILLST) ? FALSE : TRUE)
/*
* LstNodeValid (ln, l) --
* Return TRUE if the LstNode ln is valid with respect to l
*/
#define LstNodeValid(ln, l) ((((LstNode)ln) == NILLNODE) ? FALSE : TRUE)
/*
* LstIsEmpty (l) --
* TRUE if the list l is empty.
*/
#define LstIsEmpty(l) (((List)l)->firstPtr == NilListNode)
#endif /* _LSTINT_H_ */
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