The Tor Browser: js/src/jsclist.h@a63d609f5ebe

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

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

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

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

     7 #ifndef jsclist_h

     8 #define jsclist_h

    10 #include "jstypes.h"

    12 /*

    13 ** Circular linked list

    14 */

    15 typedef struct JSCListStr {

    16     struct JSCListStr *next;

    17     struct JSCListStr *prev;

    18 } JSCList;

    20 /*

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

    22 */

    23 #define JS_INSERT_BEFORE(_e,_l)  \

    24     JS_BEGIN_MACRO               \

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

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

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

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

    29     JS_END_MACRO

    31 /*

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

    33 */

    34 #define JS_INSERT_AFTER(_e,_l)   \

    35     JS_BEGIN_MACRO               \

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

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

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

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

    40     JS_END_MACRO

    42 /*

    43 ** Return the element following element "_e"

    44 */

    45 #define JS_NEXT_LINK(_e)         \

    46         ((_e)->next)

    47 /*

    48 ** Return the element preceding element "_e"

    49 */

    50 #define JS_PREV_LINK(_e)         \

    51         ((_e)->prev)

    53 /*

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

    55 */

    56 #define JS_APPEND_LINK(_e,_l) JS_INSERT_BEFORE(_e,_l)

    58 /*

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

    60 */

    61 #define JS_INSERT_LINK(_e,_l) JS_INSERT_AFTER(_e,_l)

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

    64 #define JS_LIST_HEAD(_l) (_l)->next

    65 #define JS_LIST_TAIL(_l) (_l)->prev

    67 /*

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

    69 */

    70 #define JS_REMOVE_LINK(_e)             \

    71     JS_BEGIN_MACRO                     \

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

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

    74     JS_END_MACRO

    76 /*

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

    78 ** linkage.

    79 */

    80 #define JS_REMOVE_AND_INIT_LINK(_e)    \

    81     JS_BEGIN_MACRO                     \

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

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

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

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

    86     JS_END_MACRO

    88 /*

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

    90 ** circular list is not empty

    91 */

    92 #define JS_CLIST_IS_EMPTY(_l) \

    93     ((_l)->next == (_l))

    95 /*

    96 ** Initialize a circular list

    97 */

    98 #define JS_INIT_CLIST(_l)  \

    99     JS_BEGIN_MACRO         \

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

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

   102     JS_END_MACRO

   104 #define JS_INIT_STATIC_CLIST(_l) \

   105     {(_l), (_l)}

   107 #endif /* jsclist_h */

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