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Annotation of sbbs/include/mozilla/nspr/prclist.h, revision 1.1

1.1     ! root        1: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
        !             2: /* 
        !             3:  * The contents of this file are subject to the Mozilla Public
        !             4:  * License Version 1.1 (the "License"); you may not use this file
        !             5:  * except in compliance with the License. You may obtain a copy of
        !             6:  * the License at http://www.mozilla.org/MPL/
        !             7:  * 
        !             8:  * Software distributed under the License is distributed on an "AS
        !             9:  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
        !            10:  * implied. See the License for the specific language governing
        !            11:  * rights and limitations under the License.
        !            12:  * 
        !            13:  * The Original Code is the Netscape Portable Runtime (NSPR).
        !            14:  * 
        !            15:  * The Initial Developer of the Original Code is Netscape
        !            16:  * Communications Corporation.  Portions created by Netscape are 
        !            17:  * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
        !            18:  * Rights Reserved.
        !            19:  * 
        !            20:  * Contributor(s):
        !            21:  * 
        !            22:  * Alternatively, the contents of this file may be used under the
        !            23:  * terms of the GNU General Public License Version 2 or later (the
        !            24:  * "GPL"), in which case the provisions of the GPL are applicable 
        !            25:  * instead of those above.  If you wish to allow use of your 
        !            26:  * version of this file only under the terms of the GPL and not to
        !            27:  * allow others to use your version of this file under the MPL,
        !            28:  * indicate your decision by deleting the provisions above and
        !            29:  * replace them with the notice and other provisions required by
        !            30:  * the GPL.  If you do not delete the provisions above, a recipient
        !            31:  * may use your version of this file under either the MPL or the
        !            32:  * GPL.
        !            33:  */
        !            34: 
        !            35: #ifndef prclist_h___
        !            36: #define prclist_h___
        !            37: 
        !            38: #include "prtypes.h"
        !            39: 
        !            40: typedef struct PRCListStr PRCList;
        !            41: 
        !            42: /*
        !            43: ** Circular linked list
        !            44: */
        !            45: struct PRCListStr {
        !            46:     PRCList    *next;
        !            47:     PRCList    *prev;
        !            48: };
        !            49: 
        !            50: /*
        !            51: ** Insert element "_e" into the list, before "_l".
        !            52: */
        !            53: #define PR_INSERT_BEFORE(_e,_l)     \
        !            54:     PR_BEGIN_MACRO      \
        !            55:    (_e)->next = (_l);   \
        !            56:    (_e)->prev = (_l)->prev; \
        !            57:    (_l)->prev->next = (_e); \
        !            58:    (_l)->prev = (_e);   \
        !            59:     PR_END_MACRO
        !            60: 
        !            61: /*
        !            62: ** Insert element "_e" into the list, after "_l".
        !            63: */
        !            64: #define PR_INSERT_AFTER(_e,_l)  \
        !            65:     PR_BEGIN_MACRO      \
        !            66:    (_e)->next = (_l)->next; \
        !            67:    (_e)->prev = (_l);   \
        !            68:    (_l)->next->prev = (_e); \
        !            69:    (_l)->next = (_e);   \
        !            70:     PR_END_MACRO
        !            71: 
        !            72: /*
        !            73: ** Return the element following element "_e"
        !            74: */
        !            75: #define PR_NEXT_LINK(_e)    \
        !            76:        ((_e)->next)
        !            77: /*
        !            78: ** Return the element preceding element "_e"
        !            79: */
        !            80: #define PR_PREV_LINK(_e)    \
        !            81:        ((_e)->prev)
        !            82: 
        !            83: /*
        !            84: ** Append an element "_e" to the end of the list "_l"
        !            85: */
        !            86: #define PR_APPEND_LINK(_e,_l) PR_INSERT_BEFORE(_e,_l)
        !            87: 
        !            88: /*
        !            89: ** Insert an element "_e" at the head of the list "_l"
        !            90: */
        !            91: #define PR_INSERT_LINK(_e,_l) PR_INSERT_AFTER(_e,_l)
        !            92: 
        !            93: /* Return the head/tail of the list */
        !            94: #define PR_LIST_HEAD(_l) (_l)->next
        !            95: #define PR_LIST_TAIL(_l) (_l)->prev
        !            96: 
        !            97: /*
        !            98: ** Remove the element "_e" from it's circular list.
        !            99: */
        !           100: #define PR_REMOVE_LINK(_e)        \
        !           101:     PR_BEGIN_MACRO            \
        !           102:    (_e)->prev->next = (_e)->next; \
        !           103:    (_e)->next->prev = (_e)->prev; \
        !           104:     PR_END_MACRO
        !           105: 
        !           106: /*
        !           107: ** Remove the element "_e" from it's circular list. Also initializes the
        !           108: ** linkage.
        !           109: */
        !           110: #define PR_REMOVE_AND_INIT_LINK(_e)    \
        !           111:     PR_BEGIN_MACRO            \
        !           112:    (_e)->prev->next = (_e)->next; \
        !           113:    (_e)->next->prev = (_e)->prev; \
        !           114:    (_e)->next = (_e);         \
        !           115:    (_e)->prev = (_e);         \
        !           116:     PR_END_MACRO
        !           117: 
        !           118: /*
        !           119: ** Return non-zero if the given circular list "_l" is empty, zero if the
        !           120: ** circular list is not empty
        !           121: */
        !           122: #define PR_CLIST_IS_EMPTY(_l) \
        !           123:     ((_l)->next == (_l))
        !           124: 
        !           125: /*
        !           126: ** Initialize a circular list
        !           127: */
        !           128: #define PR_INIT_CLIST(_l)  \
        !           129:     PR_BEGIN_MACRO    \
        !           130:    (_l)->next = (_l); \
        !           131:    (_l)->prev = (_l); \
        !           132:     PR_END_MACRO
        !           133: 
        !           134: #define PR_INIT_STATIC_CLIST(_l) \
        !           135:     {(_l), (_l)}
        !           136: 
        !           137: #endif /* prclist_h___ */

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