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1 office 1 /*
2 * netlink/list.h Netlink List Utilities
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
10 */
11  
12 #ifndef NETLINK_LIST_H_
13 #define NETLINK_LIST_H_
14  
15 struct nl_list_head
16 {
17 struct nl_list_head * next;
18 struct nl_list_head * prev;
19 };
20  
21  
22 static inline void __nl_list_add(struct nl_list_head *obj,
23 struct nl_list_head *prev,
24 struct nl_list_head *next)
25 {
26 prev->next = obj;
27 obj->prev = prev;
28 next->prev = obj;
29 obj->next = next;
30 }
31  
32 static inline void nl_list_add_tail(struct nl_list_head *obj,
33 struct nl_list_head *head)
34 {
35 __nl_list_add(obj, head->prev, head);
36 }
37  
38 static inline void nl_list_add_head(struct nl_list_head *obj,
39 struct nl_list_head *head)
40 {
41 __nl_list_add(obj, head, head->next);
42 }
43  
44 static inline void nl_list_del(struct nl_list_head *obj)
45 {
46 obj->next->prev = obj->prev;
47 obj->prev->next = obj->next;
48 }
49  
50 static inline int nl_list_empty(struct nl_list_head *head)
51 {
52 return head->next == head;
53 }
54  
55 #define nl_container_of(ptr, type, member) ({ \
56 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
57 (type *)( (char *)__mptr - ((size_t) &((type *)0)->member));})
58  
59 #define nl_list_entry(ptr, type, member) \
60 nl_container_of(ptr, type, member)
61  
62 #define nl_list_at_tail(pos, head, member) \
63 ((pos)->member.next == (head))
64  
65 #define nl_list_at_head(pos, head, member) \
66 ((pos)->member.prev == (head))
67  
68 #define NL_LIST_HEAD(name) \
69 struct nl_list_head name = { &(name), &(name) }
70  
71 #define nl_list_first_entry(head, type, member) \
72 nl_list_entry((head)->next, type, member)
73  
74 #define nl_list_for_each_entry(pos, head, member) \
75 for (pos = nl_list_entry((head)->next, typeof(*pos), member); \
76 &(pos)->member != (head); \
77 (pos) = nl_list_entry((pos)->member.next, typeof(*(pos)), member))
78  
79 #define nl_list_for_each_entry_safe(pos, n, head, member) \
80 for (pos = nl_list_entry((head)->next, typeof(*pos), member), \
81 n = nl_list_entry(pos->member.next, typeof(*pos), member); \
82 &(pos)->member != (head); \
83 pos = n, n = nl_list_entry(n->member.next, typeof(*n), member))
84  
85 #define nl_init_list_head(head) \
86 do { (head)->next = (head); (head)->prev = (head); } while (0)
87  
88 #endif