-
Notifications
You must be signed in to change notification settings - Fork 13
/
Copy pathlist.c
85 lines (67 loc) · 1.36 KB
/
list.c
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
79
80
81
82
83
84
85
#include "list.h"
void list_push_front(list *l, void *entry_)
{
lnode *entry = entry_;
entry->prev = 0;
if ((entry->next = l->front) == 0)
l->back = entry;
else
l->front->prev = entry;
l->front = entry;
l->cnt++;
}
void list_push_back(list *l, void *entry_)
{
lnode *entry = entry_;
entry->next = 0;
if ((entry->prev = l->back) == 0)
l->front = entry;
else
l->back->next = entry;
l->back = entry;
l->cnt++;
}
void *list_pop_front(list *l)
{
if (!l->front)
return 0;
lnode *entry = l->front;
l->front = l->front->next;
if (l->front)
l->front->prev = 0;
else
l->back = 0;
entry->next = 0;
l->cnt--;
return entry;
}
void *list_pop_back(list *l)
{
if (!l->back)
return 0;
lnode *entry = l->back;
l->back = l->back->prev;
if (l->back)
l->back->next = 0;
else
l->front = 0;
entry->prev = 0;
l->cnt--;
return entry;
}
void *list_remove(list *l, void *entry_)
{
lnode *entry = entry_;
if (l->front == entry)
l->front = entry->next;
else
entry->prev->next = entry->next;
if (l->back == entry)
l->back = entry->prev;
else
entry->next->prev = entry->prev;
lnode *save = entry->next;
entry->next = entry->prev = 0;
l->cnt--;
return save;
}