1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Simple doubly linked list implementation.
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/list.h>
#include <stddef.h>
void list_head_init(struct list_head * h)
{
h->nxt = h;
h->prv = h;
}
static void add_list(struct list_head * n,
struct list_head * prv,
struct list_head * nxt)
{
nxt->prv = n;
n->nxt = nxt;
n->prv = prv;
prv->nxt = n;
}
static void del_list(struct list_head * prv,
struct list_head * nxt)
{
nxt->prv = prv;
prv->nxt = nxt;
}
void list_add(struct list_head * n,
struct list_head * h)
{
add_list(n, h, h->nxt);
}
void list_add_tail(struct list_head * n,
struct list_head * h)
{
add_list(n, h->prv, h);
}
void list_del(struct list_head * e)
{
del_list(e->prv, e->nxt);
e->nxt = e->prv = NULL;
}
bool list_is_empty(struct list_head * h)
{
return h->nxt == h;
}
void list_move(struct list_head * n,
struct list_head * h)
{
del_list(n->prv, n->nxt);
add_list(n, h, h->nxt);
}
|
