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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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/* -*- Mode: C; tab-width: 8; c-basic-offset: 8; indent-tabs-mode: t -*- */
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/* vim:set softtabstop=8 shiftwidth=8 noet: */
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/*-
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* Copyright (C) the Mozilla Foundation.
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* All rights reserved.
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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(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*******************************************************************************/
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#ifndef linkedlist_h__
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#define linkedlist_h__
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#include <stddef.h>
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typedef struct LinkedList_s LinkedList;
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struct LinkedList_s {
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LinkedList *next;
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LinkedList *prev;
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};
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/* Convert from LinkedList* to foo*. */
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#define LinkedList_Get(e, type, prop) \
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(type*)((char*)(e) - offsetof(type, prop))
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/* Insert |e| at the beginning of |l|. */
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void LinkedList_InsertHead(LinkedList *l, LinkedList *e)
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{
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e->next = l;
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e->prev = l->prev;
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e->next->prev = e;
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e->prev->next = e;
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}
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void LinkedList_Remove(LinkedList *e)
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{
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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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}
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bool LinkedList_IsEmpty(LinkedList *e)
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{
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return e->next == e;
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}
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void LinkedList_Init(LinkedList *e)
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{
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e->next = e;
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e->prev = e;
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}
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#endif
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