/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sts=4 et sw=4 tw=99: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef jsclist_h #define jsclist_h #include "jstypes.h" /* ** Circular linked list */ typedef struct JSCListStr { struct JSCListStr* next; struct JSCListStr* prev; } JSCList; /* ** Insert element "_e" into the list, before "_l". */ #define JS_INSERT_BEFORE(_e,_l) \ JS_BEGIN_MACRO \ (_e)->next = (_l); \ (_e)->prev = (_l)->prev; \ (_l)->prev->next = (_e); \ (_l)->prev = (_e); \ JS_END_MACRO /* ** Insert element "_e" into the list, after "_l". */ #define JS_INSERT_AFTER(_e,_l) \ JS_BEGIN_MACRO \ (_e)->next = (_l)->next; \ (_e)->prev = (_l); \ (_l)->next->prev = (_e); \ (_l)->next = (_e); \ JS_END_MACRO /* ** Return the element following element "_e" */ #define JS_NEXT_LINK(_e) \ ((_e)->next) /* ** Return the element preceding element "_e" */ #define JS_PREV_LINK(_e) \ ((_e)->prev) /* ** Append an element "_e" to the end of the list "_l" */ #define JS_APPEND_LINK(_e,_l) JS_INSERT_BEFORE(_e,_l) /* ** Insert an element "_e" at the head of the list "_l" */ #define JS_INSERT_LINK(_e,_l) JS_INSERT_AFTER(_e,_l) /* Return the head/tail of the list */ #define JS_LIST_HEAD(_l) (_l)->next #define JS_LIST_TAIL(_l) (_l)->prev /* ** Remove the element "_e" from it's circular list. */ #define JS_REMOVE_LINK(_e) \ JS_BEGIN_MACRO \ (_e)->prev->next = (_e)->next; \ (_e)->next->prev = (_e)->prev; \ JS_END_MACRO /* ** Remove the element "_e" from it's circular list. Also initializes the ** linkage. */ #define JS_REMOVE_AND_INIT_LINK(_e) \ JS_BEGIN_MACRO \ (_e)->prev->next = (_e)->next; \ (_e)->next->prev = (_e)->prev; \ (_e)->next = (_e); \ (_e)->prev = (_e); \ JS_END_MACRO /* ** Return non-zero if the given circular list "_l" is empty, zero if the ** circular list is not empty */ #define JS_CLIST_IS_EMPTY(_l) \ bool((_l)->next == (_l)) /* ** Initialize a circular list */ #define JS_INIT_CLIST(_l) \ JS_BEGIN_MACRO \ (_l)->next = (_l); \ (_l)->prev = (_l); \ JS_END_MACRO #define JS_INIT_STATIC_CLIST(_l) \ {(_l), (_l)} #endif /* jsclist_h */