blob: 388e4d592617eef9331421c168bf5b64a76f890a (
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
|
/*
* Initial implementation:
* Copyright (c) 2002 Robert Drehmel
* All rights reserved.
*
* As long as the above copyright statement and this notice remain
* unchanged, you can do what ever you want with this file.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define _SEARCH_PRIVATE
#include <search.h>
#ifdef DEBUG
#include <stdio.h>
#else
#include <stdlib.h> /* for NULL */
#endif
void
insque(void *element, void *pred)
{
struct que_elem *prev, *next, *elem;
elem = (struct que_elem *)element;
prev = (struct que_elem *)pred;
if (prev == NULL) {
elem->prev = elem->next = NULL;
return;
}
next = prev->next;
if (next != NULL) {
#ifdef DEBUG
if (next->prev != prev) {
fprintf(stderr, "insque: Inconsistency detected:"
" next(%p)->prev(%p) != prev(%p)\n",
next, next->prev, prev);
}
#endif
next->prev = elem;
}
prev->next = elem;
elem->prev = prev;
elem->next = next;
}
|
