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116 lines
2.7 KiB
C
116 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 prclist_h___
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#define prclist_h___
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#include "prtypes.h"
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typedef struct PRCListStr PRCList;
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/*
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** Circular linked list
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*/
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struct PRCListStr {
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PRCList *next;
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PRCList *prev;
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};
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/*
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** Insert element "_e" into the list, before "_l".
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*/
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#define PR_INSERT_BEFORE(_e,_l) \
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PR_BEGIN_MACRO \
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(_e)->next = (_l); \
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(_e)->prev = (_l)->prev; \
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(_l)->prev->next = (_e); \
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(_l)->prev = (_e); \
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PR_END_MACRO
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/*
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** Insert element "_e" into the list, after "_l".
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*/
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#define PR_INSERT_AFTER(_e,_l) \
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PR_BEGIN_MACRO \
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(_e)->next = (_l)->next; \
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(_e)->prev = (_l); \
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(_l)->next->prev = (_e); \
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(_l)->next = (_e); \
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PR_END_MACRO
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/*
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** Return the element following element "_e"
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*/
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#define PR_NEXT_LINK(_e) \
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((_e)->next)
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/*
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** Append an element "_e" to the end of the list "_l"
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*/
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#define PR_APPEND_LINK(_e,_l) PR_INSERT_BEFORE(_e,_l)
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/*
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** Insert an element "_e" at the head of the list "_l"
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*/
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#define PR_INSERT_LINK(_e,_l) PR_INSERT_AFTER(_e,_l)
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/* Return the head/tail of the list */
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#define PR_LIST_HEAD(_l) (_l)->next
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#define PR_LIST_TAIL(_l) (_l)->prev
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/*
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** Remove the element "_e" from it's circular list.
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*/
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#define PR_REMOVE_LINK(_e) \
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PR_BEGIN_MACRO \
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(_e)->prev->next = (_e)->next; \
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(_e)->next->prev = (_e)->prev; \
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PR_END_MACRO
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/*
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** Remove the element "_e" from it's circular list. Also initializes the
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** linkage.
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*/
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#define PR_REMOVE_AND_INIT_LINK(_e) \
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PR_BEGIN_MACRO \
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(_e)->prev->next = (_e)->next; \
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(_e)->next->prev = (_e)->prev; \
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(_e)->next = (_e); \
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(_e)->prev = (_e); \
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PR_END_MACRO
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/*
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** Return non-zero if the given circular list "_l" is empty, zero if the
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** circular list is not empty
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*/
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#define PR_CLIST_IS_EMPTY(_l) \
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((_l)->next == (_l))
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/*
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** Initialize a circular list
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*/
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#define PR_INIT_CLIST(_l) \
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PR_BEGIN_MACRO \
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(_l)->next = (_l); \
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(_l)->prev = (_l); \
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PR_END_MACRO
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#define PR_INIT_STATIC_CLIST(_l) \
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{(_l), (_l)}
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#endif /* prclist_h___ */
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