e35e595f1d
the semantic of Lst_Datum which formerly returned NULL when the argument node was NULL. There was only one place in the source that relied on this so change that place.
221 lines
7.1 KiB
C
221 lines
7.1 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)lst.h 8.2 (Berkeley) 4/28/95
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* $FreeBSD$
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*/
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/*-
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* lst.h --
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* Header for using the list library
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*/
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#ifndef _LST_H_
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#define _LST_H_
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#include <sys/param.h>
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#include <stdlib.h>
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#include "sprite.h"
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/*
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* Structure of a list node.
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*/
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struct LstNode {
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struct LstNode *prevPtr; /* previous element in list */
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struct LstNode *nextPtr; /* next in list */
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int useCount:8; /* Count of functions using the node. Node may not
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* be deleted until count goes to 0 */
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int flags:8; /* Node status flags */
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void *datum; /* datum associated with this element */
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};
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typedef struct LstNode *LstNode;
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/*
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* Flags required for synchronization
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*/
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#define LN_DELETED 0x0001 /* List node should be removed when done */
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typedef enum {
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LstHead, LstMiddle, LstTail, LstUnknown
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} LstWhere;
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/*
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* The list itself
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*/
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struct Lst {
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LstNode firstPtr; /* first node in list */
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LstNode lastPtr; /* last node in list */
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Boolean isCirc; /* true if the list should be considered
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* circular */
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/*
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* fields for sequential access
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*/
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LstWhere atEnd; /* Where in the list the last access was */
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Boolean isOpen; /* true if list has been Lst_Open'ed */
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LstNode curPtr; /* current node, if open. NULL if
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* *just* opened */
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LstNode prevPtr; /* Previous node, if open. Used by
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* Lst_Remove */
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};
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typedef struct Lst *Lst;
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typedef int CompareProc(void *, void *);
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typedef int DoProc(void *, void *);
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typedef void *DuplicateProc(void *);
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typedef void FreeProc(void *);
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/*
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* NOFREE can be used as the freeProc to Lst_Destroy when the elements are
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* not to be freed.
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* NOCOPY performs similarly when given as the copyProc to Lst_Duplicate.
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*/
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#define NOFREE ((FreeProc *)NULL)
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#define NOCOPY ((DuplicateProc *)NULL)
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#define LST_CONCNEW 0 /* create new LstNode's when using Lst_Concat */
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#define LST_CONCLINK 1 /* relink LstNode's when using Lst_Concat */
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/*
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* Creation/destruction functions
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*/
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/* Create a new list */
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Lst Lst_Init(Boolean);
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/* Duplicate an existing list */
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Lst Lst_Duplicate(Lst, DuplicateProc *);
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/* Destroy an old one */
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void Lst_Destroy(Lst, FreeProc *);
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/*
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* Functions to modify a list
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*/
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/* Insert an element before another */
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ReturnStatus Lst_Insert(Lst, LstNode, void *);
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/* Insert an element after another */
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ReturnStatus Lst_Append(Lst, LstNode, void *);
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/* Place an element at the front of a lst. */
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#define Lst_AtFront(LST, D) (Lst_Insert((LST), Lst_First(LST), (D)))
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/* Place an element at the end of a lst. */
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#define Lst_AtEnd(LST, D) (Lst_Append((LST), Lst_Last(LST), (D)))
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/* Remove an element */
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ReturnStatus Lst_Remove(Lst, LstNode);
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/* Replace a node with a new value */
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#define Lst_Replace(NODE, D) (((NODE) == NULL) ? FAILURE : \
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(((NODE)->datum = (D)), SUCCESS))
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/* Concatenate two lists */
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ReturnStatus Lst_Concat(Lst, Lst, int);
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/*
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* Node-specific functions
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*/
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/* Return first element in list */
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#define Lst_First(LST) ((Lst_Valid(LST) && !Lst_IsEmpty(LST)) \
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? (LST)->firstPtr : NULL)
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/* Return last element in list */
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#define Lst_Last(LST) ((Lst_Valid(LST) && !Lst_IsEmpty(LST)) \
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? (LST)->lastPtr : NULL)
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/* Return successor to given element */
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#define Lst_Succ(NODE) (((NODE) == NULL) ? NULL : (NODE)->nextPtr)
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/* Get datum from LstNode */
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#define Lst_Datum(NODE) ((NODE)->datum)
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/*
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* Functions for entire lists
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*/
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/* Find an element in a list */
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#define Lst_Find(LST, D, FN) (Lst_FindFrom((LST), Lst_First(LST), (D), (FN)))
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/* Find an element starting from somewhere */
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LstNode Lst_FindFrom(Lst, LstNode, void *, CompareProc *);
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/*
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* See if the given datum is on the list. Returns the LstNode containing
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* the datum
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*/
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LstNode Lst_Member(Lst, void *);
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/* Apply a function to all elements of a lst */
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void Lst_ForEach(Lst, DoProc *, void *);
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#define Lst_ForEach(LST, FN, D) (Lst_ForEachFrom((LST), Lst_First(LST), \
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(FN), (D)))
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/*
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* Apply a function to all elements of a lst starting from a certain point.
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* If the list is circular, the application will wrap around to the
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* beginning of the list again.
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*/
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void Lst_ForEachFrom(Lst, LstNode, DoProc *, void *);
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/*
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* these functions are for dealing with a list as a table, of sorts.
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* An idea of the "current element" is kept and used by all the functions
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* between Lst_Open() and Lst_Close().
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*/
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/* Open the list */
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ReturnStatus Lst_Open(Lst);
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/* Next element please */
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LstNode Lst_Next(Lst);
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/* Done yet? */
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Boolean Lst_IsAtEnd(Lst);
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/* Finish table access */
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void Lst_Close(Lst);
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/*
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* for using the list as a queue
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*/
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/* Place an element at tail of queue */
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#define Lst_EnQueue(LST, D) (Lst_Valid(LST) \
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? Lst_Append((LST), Lst_Last(LST), (D)) \
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: FAILURE)
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/* Remove an element from head of queue */
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void * Lst_DeQueue(Lst);
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/*
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* LstValid (L) --
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* Return TRUE if the list L is valid
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*/
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#define Lst_Valid(L) (((L) == NULL) ? FALSE : TRUE)
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/*
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* LstNodeValid (LN, L) --
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* Return TRUE if the LstNode LN is valid with respect to L
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*/
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#define Lst_NodeValid(LN, L) (((LN) == NULL) ? FALSE : TRUE)
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/*
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* Lst_IsEmpty(L) --
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* TRUE if the list L is empty.
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*/
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#define Lst_IsEmpty(L) (!Lst_Valid(L) || (L)->firstPtr == NULL)
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#endif /* _LST_H_ */
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