michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jsclist_h
michael@0: #define jsclist_h
michael@0: 
michael@0: #include "jstypes.h"
michael@0: 
michael@0: /*
michael@0: ** Circular linked list
michael@0: */
michael@0: typedef struct JSCListStr {
michael@0:     struct JSCListStr *next;
michael@0:     struct JSCListStr *prev;
michael@0: } JSCList;
michael@0: 
michael@0: /*
michael@0: ** Insert element "_e" into the list, before "_l".
michael@0: */
michael@0: #define JS_INSERT_BEFORE(_e,_l)  \
michael@0:     JS_BEGIN_MACRO               \
michael@0:         (_e)->next = (_l);       \
michael@0:         (_e)->prev = (_l)->prev; \
michael@0:         (_l)->prev->next = (_e); \
michael@0:         (_l)->prev = (_e);       \
michael@0:     JS_END_MACRO
michael@0: 
michael@0: /*
michael@0: ** Insert element "_e" into the list, after "_l".
michael@0: */
michael@0: #define JS_INSERT_AFTER(_e,_l)   \
michael@0:     JS_BEGIN_MACRO               \
michael@0:         (_e)->next = (_l)->next; \
michael@0:         (_e)->prev = (_l);       \
michael@0:         (_l)->next->prev = (_e); \
michael@0:         (_l)->next = (_e);       \
michael@0:     JS_END_MACRO
michael@0: 
michael@0: /*
michael@0: ** Return the element following element "_e"
michael@0: */
michael@0: #define JS_NEXT_LINK(_e)         \
michael@0:         ((_e)->next)
michael@0: /*
michael@0: ** Return the element preceding element "_e"
michael@0: */
michael@0: #define JS_PREV_LINK(_e)         \
michael@0:         ((_e)->prev)
michael@0: 
michael@0: /*
michael@0: ** Append an element "_e" to the end of the list "_l"
michael@0: */
michael@0: #define JS_APPEND_LINK(_e,_l) JS_INSERT_BEFORE(_e,_l)
michael@0: 
michael@0: /*
michael@0: ** Insert an element "_e" at the head of the list "_l"
michael@0: */
michael@0: #define JS_INSERT_LINK(_e,_l) JS_INSERT_AFTER(_e,_l)
michael@0: 
michael@0: /* Return the head/tail of the list */
michael@0: #define JS_LIST_HEAD(_l) (_l)->next
michael@0: #define JS_LIST_TAIL(_l) (_l)->prev
michael@0: 
michael@0: /*
michael@0: ** Remove the element "_e" from it's circular list.
michael@0: */
michael@0: #define JS_REMOVE_LINK(_e)             \
michael@0:     JS_BEGIN_MACRO                     \
michael@0:         (_e)->prev->next = (_e)->next; \
michael@0:         (_e)->next->prev = (_e)->prev; \
michael@0:     JS_END_MACRO
michael@0: 
michael@0: /*
michael@0: ** Remove the element "_e" from it's circular list. Also initializes the
michael@0: ** linkage.
michael@0: */
michael@0: #define JS_REMOVE_AND_INIT_LINK(_e)    \
michael@0:     JS_BEGIN_MACRO                     \
michael@0:         (_e)->prev->next = (_e)->next; \
michael@0:         (_e)->next->prev = (_e)->prev; \
michael@0:         (_e)->next = (_e);             \
michael@0:         (_e)->prev = (_e);             \
michael@0:     JS_END_MACRO
michael@0: 
michael@0: /*
michael@0: ** Return non-zero if the given circular list "_l" is empty, zero if the
michael@0: ** circular list is not empty
michael@0: */
michael@0: #define JS_CLIST_IS_EMPTY(_l) \
michael@0:     ((_l)->next == (_l))
michael@0: 
michael@0: /*
michael@0: ** Initialize a circular list
michael@0: */
michael@0: #define JS_INIT_CLIST(_l)  \
michael@0:     JS_BEGIN_MACRO         \
michael@0:         (_l)->next = (_l); \
michael@0:         (_l)->prev = (_l); \
michael@0:     JS_END_MACRO
michael@0: 
michael@0: #define JS_INIT_STATIC_CLIST(_l) \
michael@0:     {(_l), (_l)}
michael@0: 
michael@0: #endif /* jsclist_h */