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2 * Copyright (C) 1997, 2000 Kunihiro Ishiguro
4 * This file is part of GNU Zebra.
6 * GNU Zebra is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
11 * GNU Zebra is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef _ZEBRA_LINKLIST_H
22 #define _ZEBRA_LINKLIST_H
24 /* listnodes must always contain data to be valid. Adding an empty node
25 * to a list is invalid
28 struct listnode
*next
;
29 struct listnode
*prev
;
31 /* private member, use getdata() to retrieve, do not access directly */
36 struct listnode
*head
;
37 struct listnode
*tail
;
39 /* invariant: count is the number of listnodes in the list */
43 * Returns -1 if val1 < val2, 0 if equal?, 1 if val1 > val2.
44 * Used as definition of sorted for listnode_add_sort
46 int (*cmp
)(void *val1
, void *val2
);
48 /* callback to free user-owned data when listnode is deleted. supplying
49 * this callback is very much encouraged!
51 void (*del
)(void *val
);
54 #define listnextnode(X) ((X) ? ((X)->next) : NULL)
55 #define listhead(X) ((X) ? ((X)->head) : NULL)
56 #define listtail(X) ((X) ? ((X)->tail) : NULL)
57 #define listcount(X) ((X)->count)
58 #define list_isempty(X) ((X)->head == NULL && (X)->tail == NULL)
59 #define listgetdata(X) (assert((X)->data != NULL), (X)->data)
63 list_new(void); /* encouraged: set list.del callback on new lists */
64 extern void list_free(struct list
*);
66 extern void listnode_add(struct list
*, void *);
67 extern void listnode_add_sort(struct list
*, void *);
68 extern struct listnode
*listnode_add_after(struct list
*, struct listnode
*,
70 extern struct listnode
*listnode_add_before(struct list
*, struct listnode
*,
72 extern void listnode_move_to_tail(struct list
*, struct listnode
*);
73 extern void listnode_delete(struct list
*, void *);
74 extern struct listnode
*listnode_lookup(struct list
*, void *);
75 extern void *listnode_head(struct list
*);
77 extern void list_delete(struct list
*);
78 extern void list_delete_all_node(struct list
*);
80 /* For ospfd and ospf6d. */
81 extern void list_delete_node(struct list
*, struct listnode
*);
84 extern void list_add_list(struct list
*, struct list
*);
86 /* List iteration macro.
87 * Usage: for (ALL_LIST_ELEMENTS (...) { ... }
88 * It is safe to delete the listnode using this macro.
90 #define ALL_LIST_ELEMENTS(list, node, nextnode, data) \
91 (node) = listhead(list), ((data) = NULL); \
93 && ((data) = listgetdata(node), (nextnode) = node->next, 1); \
94 (node) = (nextnode), ((data) = NULL)
96 /* read-only list iteration macro.
97 * Usage: as per ALL_LIST_ELEMENTS, but not safe to delete the listnode Only
98 * use this macro when it is *immediately obvious* the listnode is not
99 * deleted in the body of the loop. Does not have forward-reference overhead
102 #define ALL_LIST_ELEMENTS_RO(list, node, data) \
103 (node) = listhead(list), ((data) = NULL); \
104 (node) != NULL && ((data) = listgetdata(node), 1); \
105 (node) = listnextnode(node), ((data) = NULL)
107 /* these *do not* cleanup list nodes and referenced data, as the functions
108 * do - these macros simply {de,at}tach a listnode from/to a list.
111 /* List node attach macro. */
112 #define LISTNODE_ATTACH(L, N) \
114 (N)->prev = (L)->tail; \
116 if ((L)->head == NULL) \
119 (L)->tail->next = (N); \
124 /* List node detach macro. */
125 #define LISTNODE_DETACH(L, N) \
128 (N)->prev->next = (N)->next; \
130 (L)->head = (N)->next; \
132 (N)->next->prev = (N)->prev; \
134 (L)->tail = (N)->prev; \
138 #endif /* _ZEBRA_LINKLIST_H */