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/. */ 6 7 #ifndef jsclist_h 8 #define jsclist_h 9 10 #include "jstypes.h" 11 12 /* 13 ** Circular linked list 14 */ 15 typedef struct JSCListStr { 16 struct JSCListStr* next; 17 struct JSCListStr* prev; 18 } JSCList; 19 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 30 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 41 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) 52 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) 57 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) 62 63 /* Return the head/tail of the list */ 64 #define JS_LIST_HEAD(_l) (_l)->next 65 #define JS_LIST_TAIL(_l) (_l)->prev 66 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 75 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 87 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 bool((_l)->next == (_l)) 94 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 103 104 #define JS_INIT_STATIC_CLIST(_l) \ 105 {(_l), (_l)} 106 107 #endif /* jsclist_h */ 108