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1.1 root 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: */
1.1.1.2 ! root 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); \
1.1 root 61: JS_END_MACRO
62:
63: /*
64: ** Insert element "_e" into the list, after "_l".
65: */
1.1.1.2 ! root 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); \
1.1 root 72: JS_END_MACRO
73:
74: /*
75: ** Return the element following element "_e"
76: */
1.1.1.2 ! root 77: #define JS_NEXT_LINK(_e) \
! 78: ((_e)->next)
1.1 root 79: /*
80: ** Return the element preceding element "_e"
81: */
1.1.1.2 ! root 82: #define JS_PREV_LINK(_e) \
! 83: ((_e)->prev)
1.1 root 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: */
1.1.1.2 ! root 102: #define JS_REMOVE_LINK(_e) \
! 103: JS_BEGIN_MACRO \
! 104: (_e)->prev->next = (_e)->next; \
! 105: (_e)->next->prev = (_e)->prev; \
1.1 root 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) \
1.1.1.2 ! root 113: JS_BEGIN_MACRO \
! 114: (_e)->prev->next = (_e)->next; \
! 115: (_e)->next->prev = (_e)->prev; \
! 116: (_e)->next = (_e); \
! 117: (_e)->prev = (_e); \
1.1 root 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) \
1.1.1.2 ! root 131: JS_BEGIN_MACRO \
! 132: (_l)->next = (_l); \
! 133: (_l)->prev = (_l); \
1.1 root 134: JS_END_MACRO
135:
136: #define JS_INIT_STATIC_CLIST(_l) \
137: {(_l), (_l)}
138:
139: #endif /* jsclist_h___ */
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