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82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef XPLIST_H
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#define XPLIST_H
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#include "xp_core.h"
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/* generic list structure
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*/
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struct _XP_List {
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void * object;
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struct _XP_List * next;
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struct _XP_List * prev;
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};
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XP_BEGIN_PROTOS
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extern XP_List * XP_ListNew (void);
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extern void XP_ListDestroy (XP_List *list);
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extern void XP_ListAddObject (XP_List *list, void *newObject);
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extern void XP_ListAddObjectToEnd (XP_List *list, void *newObject);
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extern void XP_ListInsertObject (XP_List *list, void *insert_before, void *newObject);
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extern void XP_ListInsertObjectAfter (XP_List *list, void *insert_after, void *newObject);
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/* returns the list node of the specified object if it was
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* in the list
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*/
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extern XP_List * XP_ListFindObject (XP_List *list, void * obj);
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extern Bool XP_ListRemoveObject (XP_List *list, void *oldObject);
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extern void * XP_ListRemoveTopObject (XP_List *list);
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extern void * XP_ListPeekTopObject (XP_List *list);
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extern void * XP_ListRemoveEndObject (XP_List *list);
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#define XP_ListIsEmpty(list) (list ? list->next == NULL : TRUE)
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extern int XP_ListCount (XP_List *list);
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#define XP_ListTopObject(list) (list && list->next ? list->next->object : NULL)
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extern void * XP_ListGetEndObject (XP_List *list);
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extern void * XP_ListGetObjectNum (XP_List *list, int num);
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extern int XP_ListGetNumFromObject (XP_List *list, void * object);
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/* move the top object to the bottom of the list
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* this function is useful for reordering the list
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* so that a round robin ordering can occur
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*/
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extern void XP_ListMoveTopToBottom (XP_List *list);
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XP_END_PROTOS
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/* traverse the list in order
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*
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* make a copy of the list pointer and point it at the list object head.
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* the first call the XP_ListNextObject will return the first object
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* and increment the copy of the list pointer. Subsequent calls
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* will continue to increment the copy of the list pointer and return
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* objects
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*/
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#define XP_ListNextObject(list) \
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(list && ((list = list->next)!=0) ? list->object : NULL)
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#endif /* XPLIST_H */
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