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/*-
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* 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.
*
* @(#)lst.h 8.2 (Berkeley) 4/28/95
* $FreeBSD$
*/
#ifndef lst_h_38f3ead1
#define lst_h_38f3ead1
/*-
* lst.h --
* Header for using the list library
*/
#include "util.h"
/*
* Structure of a list node.
*/
struct LstNode {
struct LstNode *prevPtr; /* previous element in list */
struct LstNode *nextPtr; /* next in list */
void *datum; /* datum associated with this element */
};
typedef struct LstNode LstNode;
/*
* The list itself
*/
struct Lst {
LstNode *firstPtr; /* first node in list */
LstNode *lastPtr; /* last node in list */
};
typedef struct Lst Lst;
typedef void *DuplicateProc(void *);
typedef void FreeProc(void *);
/*
* NOFREE can be used as the freeProc to Lst_Destroy when the elements are
* not to be freed.
* NOCOPY performs similarly when given as the copyProc to Lst_Duplicate.
*/
#define NOFREE ((FreeProc *)NULL)
#define NOCOPY ((DuplicateProc *)NULL)
#define LST_CONCNEW 0 /* create new LstNode's when using Lst_Concat */
#define LST_CONCLINK 1 /* relink LstNode's when using Lst_Concat */
/*
* Creation/destruction functions
*/
/* Create a new list */
#define Lst_Init(LST) do { \
(LST)->firstPtr = NULL; \
(LST)->lastPtr = NULL; \
} while (0)
#define Lst_Initializer(NAME) { NULL, NULL }
/* Duplicate an existing list */
void Lst_Duplicate(Lst *, Lst *, DuplicateProc *);
/* Destroy an old one */
void Lst_Destroy(Lst *, FreeProc *);
/*
* Functions to modify a list
*/
/* Insert an element before another */
void Lst_Insert(Lst *, LstNode *, void *);
/* Insert an element after another */
void Lst_Append(Lst *, LstNode *, void *);
/* Place an element at the front of a lst. */
#define Lst_AtFront(LST, D) (Lst_Insert((LST), Lst_First(LST), (D)))
/* Place an element at the end of a lst. */
#define Lst_AtEnd(LST, D) (Lst_Append((LST), Lst_Last(LST), (D)))
/* Remove an element */
void Lst_Remove(Lst *, LstNode *);
/* Replace a node with a new value */
#define Lst_Replace(NODE, D) ((void)((NODE)->datum = (D)))
/* Concatenate two lists */
void Lst_Concat(Lst *, Lst *, int);
/*
* Node-specific functions
*/
/* Return first element in list */
#define Lst_First(LST) ((Lst_Valid(LST) && !Lst_IsEmpty(LST)) \
? (LST)->firstPtr : NULL)
/* Return last element in list */
#define Lst_Last(LST) ((Lst_Valid(LST) && !Lst_IsEmpty(LST)) \
? (LST)->lastPtr : NULL)
/* Return successor to given element */
#define Lst_Succ(NODE) (((NODE) == NULL) ? NULL : (NODE)->nextPtr)
#define LST_NEXT(NODE) ((NODE)->nextPtr)
/* Get datum from LstNode */
#define Lst_Datum(NODE) ((NODE)->datum)
/*
* Functions for entire lists
*/
/*
* See if the given datum is on the list. Returns the LstNode containing
* the datum
*/
LstNode *Lst_Member(Lst *, void *);
/* Loop through a list. Note, that you may not delete the list element. */
#define LST_FOREACH(PTR, LST) \
for ((PTR) = (LST)->firstPtr; (PTR) != NULL; (PTR) = (PTR)->nextPtr)
/*
* for using the list as a queue
*/
/* Place an element at tail of queue */
#define Lst_EnQueue(LST, D) (Lst_Valid(LST) \
? Lst_Append((LST), Lst_Last(LST), (D)) \
: (void)0)
/* Remove an element from head of queue */
void *Lst_DeQueue(Lst *);
/*
* LstValid (L) --
* Return TRUE if the list L is valid
*/
#define Lst_Valid(L) (((L) == NULL) ? FALSE : TRUE)
/*
* LstNodeValid (LN, L) --
* Return TRUE if the LstNode LN is valid with respect to L
*/
#define Lst_NodeValid(LN, L) (((LN) == NULL) ? FALSE : TRUE)
/*
* Lst_IsEmpty(L) --
* TRUE if the list L is empty.
*/
#define Lst_IsEmpty(L) (!Lst_Valid(L) || (L)->firstPtr == NULL)
#endif /* lst_h_38f3ead1 */
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