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 0 : 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___ */
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