andre@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
andre@0: /* This Source Code Form is subject to the terms of the Mozilla Public
andre@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
andre@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
andre@0: 
andre@0: #ifndef prclist_h___
andre@0: #define prclist_h___
andre@0: 
andre@0: #include "prtypes.h"
andre@0: 
andre@0: typedef struct PRCListStr PRCList;
andre@0: 
andre@0: /*
andre@0: ** Circular linked list
andre@0: */
andre@0: struct PRCListStr {
andre@0:     PRCList	*next;
andre@0:     PRCList	*prev;
andre@0: };
andre@0: 
andre@0: /*
andre@0: ** Insert element "_e" into the list, before "_l".
andre@0: */
andre@0: #define PR_INSERT_BEFORE(_e,_l)	 \
andre@0:     PR_BEGIN_MACRO		 \
andre@0: 	(_e)->next = (_l);	 \
andre@0: 	(_e)->prev = (_l)->prev; \
andre@0: 	(_l)->prev->next = (_e); \
andre@0: 	(_l)->prev = (_e);	 \
andre@0:     PR_END_MACRO
andre@0: 
andre@0: /*
andre@0: ** Insert element "_e" into the list, after "_l".
andre@0: */
andre@0: #define PR_INSERT_AFTER(_e,_l)	 \
andre@0:     PR_BEGIN_MACRO		 \
andre@0: 	(_e)->next = (_l)->next; \
andre@0: 	(_e)->prev = (_l);	 \
andre@0: 	(_l)->next->prev = (_e); \
andre@0: 	(_l)->next = (_e);	 \
andre@0:     PR_END_MACRO
andre@0: 
andre@0: /*
andre@0: ** Return the element following element "_e"
andre@0: */
andre@0: #define PR_NEXT_LINK(_e)	 \
andre@0:     	((_e)->next)
andre@0: /*
andre@0: ** Return the element preceding element "_e"
andre@0: */
andre@0: #define PR_PREV_LINK(_e)	 \
andre@0:     	((_e)->prev)
andre@0: 
andre@0: /*
andre@0: ** Append an element "_e" to the end of the list "_l"
andre@0: */
andre@0: #define PR_APPEND_LINK(_e,_l) PR_INSERT_BEFORE(_e,_l)
andre@0: 
andre@0: /*
andre@0: ** Insert an element "_e" at the head of the list "_l"
andre@0: */
andre@0: #define PR_INSERT_LINK(_e,_l) PR_INSERT_AFTER(_e,_l)
andre@0: 
andre@0: /* Return the head/tail of the list */
andre@0: #define PR_LIST_HEAD(_l) (_l)->next
andre@0: #define PR_LIST_TAIL(_l) (_l)->prev
andre@0: 
andre@0: /*
andre@0: ** Remove the element "_e" from it's circular list.
andre@0: */
andre@0: #define PR_REMOVE_LINK(_e)	       \
andre@0:     PR_BEGIN_MACRO		       \
andre@0: 	(_e)->prev->next = (_e)->next; \
andre@0: 	(_e)->next->prev = (_e)->prev; \
andre@0:     PR_END_MACRO
andre@0: 
andre@0: /*
andre@0: ** Remove the element "_e" from it's circular list. Also initializes the
andre@0: ** linkage.
andre@0: */
andre@0: #define PR_REMOVE_AND_INIT_LINK(_e)    \
andre@0:     PR_BEGIN_MACRO		       \
andre@0: 	(_e)->prev->next = (_e)->next; \
andre@0: 	(_e)->next->prev = (_e)->prev; \
andre@0: 	(_e)->next = (_e);	       \
andre@0: 	(_e)->prev = (_e);	       \
andre@0:     PR_END_MACRO
andre@0: 
andre@0: /*
andre@0: ** Return non-zero if the given circular list "_l" is empty, zero if the
andre@0: ** circular list is not empty
andre@0: */
andre@0: #define PR_CLIST_IS_EMPTY(_l) \
andre@0:     ((_l)->next == (_l))
andre@0: 
andre@0: /*
andre@0: ** Initialize a circular list
andre@0: */
andre@0: #define PR_INIT_CLIST(_l)  \
andre@0:     PR_BEGIN_MACRO	   \
andre@0: 	(_l)->next = (_l); \
andre@0: 	(_l)->prev = (_l); \
andre@0:     PR_END_MACRO
andre@0: 
andre@0: #define PR_INIT_STATIC_CLIST(_l) \
andre@0:     {(_l), (_l)}
andre@0: 
andre@0: #endif /* prclist_h___ */