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108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jsclist_h
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#define jsclist_h
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#include "jstypes.h"
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/*
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** Circular linked list
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*/
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typedef struct JSCListStr {
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struct JSCListStr *next;
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struct JSCListStr *prev;
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} JSCList;
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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 JS_INSERT_BEFORE(_e,_l) \
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JS_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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JS_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 JS_INSERT_AFTER(_e,_l) \
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JS_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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JS_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 JS_NEXT_LINK(_e) \
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((_e)->next)
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/*
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** Return the element preceding element "_e"
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*/
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#define JS_PREV_LINK(_e) \
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((_e)->prev)
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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 JS_APPEND_LINK(_e,_l) JS_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 JS_INSERT_LINK(_e,_l) JS_INSERT_AFTER(_e,_l)
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/* Return the head/tail of the list */
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#define JS_LIST_HEAD(_l) (_l)->next
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#define JS_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 JS_REMOVE_LINK(_e) \
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JS_BEGIN_MACRO \
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(_e)->prev->next = (_e)->next; \
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(_e)->next->prev = (_e)->prev; \
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JS_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 JS_REMOVE_AND_INIT_LINK(_e) \
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JS_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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JS_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 JS_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 JS_INIT_CLIST(_l) \
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JS_BEGIN_MACRO \
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(_l)->next = (_l); \
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(_l)->prev = (_l); \
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JS_END_MACRO
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#define JS_INIT_STATIC_CLIST(_l) \
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{(_l), (_l)}
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#endif /* jsclist_h */
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