The Tor Browser: nsprpub/pr/include/prclist.h@7e26c7da4463

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef prclist_h___

     7 #define prclist_h___

     9 #include "prtypes.h"

    11 typedef struct PRCListStr PRCList;

    13 /*

    14 ** Circular linked list

    15 */

    16 struct PRCListStr {

    17     PRCList	*next;

    18     PRCList	*prev;

    19 };

    21 /*

    22 ** Insert element "_e" into the list, before "_l".

    23 */

    24 #define PR_INSERT_BEFORE(_e,_l)	 \

    25     PR_BEGIN_MACRO		 \

    26 	(_e)->next = (_l);	 \

    27 	(_e)->prev = (_l)->prev; \

    28 	(_l)->prev->next = (_e); \

    29 	(_l)->prev = (_e);	 \

    30     PR_END_MACRO

    32 /*

    33 ** Insert element "_e" into the list, after "_l".

    34 */

    35 #define PR_INSERT_AFTER(_e,_l)	 \

    36     PR_BEGIN_MACRO		 \

    37 	(_e)->next = (_l)->next; \

    38 	(_e)->prev = (_l);	 \

    39 	(_l)->next->prev = (_e); \

    40 	(_l)->next = (_e);	 \

    41     PR_END_MACRO

    43 /*

    44 ** Return the element following element "_e"

    45 */

    46 #define PR_NEXT_LINK(_e)	 \

    47     	((_e)->next)

    48 /*

    49 ** Return the element preceding element "_e"

    50 */

    51 #define PR_PREV_LINK(_e)	 \

    52     	((_e)->prev)

    54 /*

    55 ** Append an element "_e" to the end of the list "_l"

    56 */

    57 #define PR_APPEND_LINK(_e,_l) PR_INSERT_BEFORE(_e,_l)

    59 /*

    60 ** Insert an element "_e" at the head of the list "_l"

    61 */

    62 #define PR_INSERT_LINK(_e,_l) PR_INSERT_AFTER(_e,_l)

    64 /* Return the head/tail of the list */

    65 #define PR_LIST_HEAD(_l) (_l)->next

    66 #define PR_LIST_TAIL(_l) (_l)->prev

    68 /*

    69 ** Remove the element "_e" from it's circular list.

    70 */

    71 #define PR_REMOVE_LINK(_e)	       \

    72     PR_BEGIN_MACRO		       \

    73 	(_e)->prev->next = (_e)->next; \

    74 	(_e)->next->prev = (_e)->prev; \

    75     PR_END_MACRO

    77 /*

    78 ** Remove the element "_e" from it's circular list. Also initializes the

    79 ** linkage.

    80 */

    81 #define PR_REMOVE_AND_INIT_LINK(_e)    \

    82     PR_BEGIN_MACRO		       \

    83 	(_e)->prev->next = (_e)->next; \

    84 	(_e)->next->prev = (_e)->prev; \

    85 	(_e)->next = (_e);	       \

    86 	(_e)->prev = (_e);	       \

    87     PR_END_MACRO

    89 /*

    90 ** Return non-zero if the given circular list "_l" is empty, zero if the

    91 ** circular list is not empty

    92 */

    93 #define PR_CLIST_IS_EMPTY(_l) \

    94     ((_l)->next == (_l))

    96 /*

    97 ** Initialize a circular list

    98 */

    99 #define PR_INIT_CLIST(_l)  \

   100     PR_BEGIN_MACRO	   \

   101 	(_l)->next = (_l); \

   102 	(_l)->prev = (_l); \

   103     PR_END_MACRO

   105 #define PR_INIT_STATIC_CLIST(_l) \

   106     {(_l), (_l)}

   108 #endif /* prclist_h___ */

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