blob: 0d599db6b4974cbce25285b9855c11402b114ec6 (
plain)
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
|
/* vi: set sw=4 ts=4: */
/*
* linked list helper functions.
*
* Copyright (C) 2003 Glenn McGrath
* Copyright (C) 2005 Vladimir Oleynik
* Copyright (C) 2005 Bernhard Fischer
*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
*/
#include <stdlib.h>
#include "libbb.h"
#ifdef L_llist_add_to
/* Add data to the start of the linked list. */
llist_t *llist_add_to(llist_t *old_head, char *new_item)
{
llist_t *new_head;
new_head = xmalloc(sizeof(llist_t));
new_head->data = new_item;
new_head->link = old_head;
return (new_head);
}
#endif
#ifdef L_llist_add_to_end
/* Add data to the end of the linked list. */
llist_t *llist_add_to_end(llist_t *list_head, char *data)
{
llist_t *new_item;
new_item = xmalloc(sizeof(llist_t));
new_item->data = data;
new_item->link = NULL;
if (list_head == NULL) {
list_head = new_item;
} else {
llist_t *tail = list_head;
while (tail->link)
tail = tail->link;
tail->link = new_item;
}
return list_head;
}
#endif
#ifdef L_llist_pop
/* Remove first element from the list and return it */
void *llist_pop(llist_t **head)
{
void *data;
if(!*head) data = *head;
else {
void *next = (*head)->link;
data = (*head)->data;
*head = (*head)->link;
free(next);
}
return data;
}
#endif
#ifdef L_llist_free
/* Recursively free all elements in the linked list. If freeit != NULL
* call it on each datum in the list */
void llist_free(llist_t *elm, void (*freeit)(void *data))
{
while (elm) {
void *data = llist_pop(&elm);
if (freeit) freeit(data);
}
}
#endif
|
