1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* ***** BEGIN LICENSE BLOCK ***** 3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1 4 * 5 * The contents of this file are subject to the Mozilla Public License Version 6 * 1.1 (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * http://www.mozilla.org/MPL/ 9 * 10 * Software distributed under the License is distributed on an "AS IS" basis, 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 12 * for the specific language governing rights and limitations under the 13 * License. 14 * 15 * The Original Code is Mozilla Communicator client code, released 16 * March 31, 1998. 17 * 18 * The Initial Developer of the Original Code is 19 * Netscape Communications Corporation. 20 * Portions created by the Initial Developer are Copyright (C) 1998 21 * the Initial Developer. All Rights Reserved. 22 * 23 * Contributor(s): 24 * 25 * Alternatively, the contents of this file may be used under the terms of 26 * either of the GNU General Public License Version 2 or later (the "GPL"), 27 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), 28 * in which case the provisions of the GPL or the LGPL are applicable instead 29 * of those above. If you wish to allow use of your version of this file only 30 * under the terms of either the GPL or the LGPL, and not to allow others to 31 * use your version of this file under the terms of the MPL, indicate your 32 * decision by deleting the provisions above and replace them with the notice 33 * and other provisions required by the GPL or the LGPL. If you do not delete 34 * the provisions above, a recipient may use your version of this file under 35 * the terms of any one of the MPL, the GPL or the LGPL. 36 * 37 * ***** END LICENSE BLOCK ***** */ 38 39 #ifndef jsclist_h___ 40 #define jsclist_h___ 41 42 #include "jstypes.h" 43 44 /* 45 ** Circular linked list 46 */ 47 typedef struct JSCListStr { 48 struct JSCListStr *next; 49 struct JSCListStr *prev; 50 } JSCList; 51 52 /* 53 ** Insert element "_e" into the list, before "_l". 54 */ 55 #define JS_INSERT_BEFORE(_e,_l) \ 56 JS_BEGIN_MACRO \ 57 (_e)->next = (_l); \ 58 (_e)->prev = (_l)->prev; \ 59 (_l)->prev->next = (_e); \ 60 (_l)->prev = (_e); \ 61 JS_END_MACRO 62 63 /* 64 ** Insert element "_e" into the list, after "_l". 65 */ 66 #define JS_INSERT_AFTER(_e,_l) \ 67 JS_BEGIN_MACRO \ 68 (_e)->next = (_l)->next; \ 69 (_e)->prev = (_l); \ 70 (_l)->next->prev = (_e); \ 71 (_l)->next = (_e); \ 72 JS_END_MACRO 73 74 /* 75 ** Return the element following element "_e" 76 */ 77 #define JS_NEXT_LINK(_e) \ 78 ((_e)->next) 79 /* 80 ** Return the element preceding element "_e" 81 */ 82 #define JS_PREV_LINK(_e) \ 83 ((_e)->prev) 84 85 /* 86 ** Append an element "_e" to the end of the list "_l" 87 */ 88 #define JS_APPEND_LINK(_e,_l) JS_INSERT_BEFORE(_e,_l) 89 90 /* 91 ** Insert an element "_e" at the head of the list "_l" 92 */ 93 #define JS_INSERT_LINK(_e,_l) JS_INSERT_AFTER(_e,_l) 94 95 /* Return the head/tail of the list */ 96 #define JS_LIST_HEAD(_l) (_l)->next 97 #define JS_LIST_TAIL(_l) (_l)->prev 98 99 /* 100 ** Remove the element "_e" from it's circular list. 101 */ 102 #define JS_REMOVE_LINK(_e) \ 103 JS_BEGIN_MACRO \ 104 (_e)->prev->next = (_e)->next; \ 105 (_e)->next->prev = (_e)->prev; \ 106 JS_END_MACRO 107 108 /* 109 ** Remove the element "_e" from it's circular list. Also initializes the 110 ** linkage. 111 */ 112 #define JS_REMOVE_AND_INIT_LINK(_e) \ 113 JS_BEGIN_MACRO \ 114 (_e)->prev->next = (_e)->next; \ 115 (_e)->next->prev = (_e)->prev; \ 116 (_e)->next = (_e); \ 117 (_e)->prev = (_e); \ 118 JS_END_MACRO 119 120 /* 121 ** Return non-zero if the given circular list "_l" is empty, zero if the 122 ** circular list is not empty 123 */ 124 #define JS_CLIST_IS_EMPTY(_l) \ 125 ((_l)->next == (_l)) 126 127 /* 128 ** Initialize a circular list 129 */ 130 #define JS_INIT_CLIST(_l) \ 131 JS_BEGIN_MACRO \ 132 (_l)->next = (_l); \ 133 (_l)->prev = (_l); \ 134 JS_END_MACRO 135 136 #define JS_INIT_STATIC_CLIST(_l) \ 137 {(_l), (_l)} 138 139 #endif /* jsclist_h___ */ 140