summaryrefslogtreecommitdiff
path: root/mru.c
blob: 9dedae0287ed2988437a56b307d7262a4953d9eb (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
#include "cache.h"
#include "mru.h"
 
void mru_append(struct mru *mru, void *item)
{
	struct mru_entry *cur = xmalloc(sizeof(*cur));
	cur->item = item;
	cur->prev = mru->tail;
	cur->next = NULL;
 
	if (mru->tail)
		mru->tail->next = cur;
	else
		mru->head = cur;
	mru->tail = cur;
}
 
void mru_mark(struct mru *mru, struct mru_entry *entry)
{
	/* If we're already at the front of the list, nothing to do */
	if (mru->head == entry)
		return;
 
	/* Otherwise, remove us from our current slot... */
	if (entry->prev)
		entry->prev->next = entry->next;
	if (entry->next)
		entry->next->prev = entry->prev;
	else
		mru->tail = entry->prev;
 
	/* And insert us at the beginning. */
	entry->prev = NULL;
	entry->next = mru->head;
	if (mru->head)
		mru->head->prev = entry;
	mru->head = entry;
}
 
void mru_clear(struct mru *mru)
{
	struct mru_entry *p = mru->head;
 
	while (p) {
		struct mru_entry *to_free = p;
		p = p->next;
		free(to_free);
	}
	mru->head = mru->tail = NULL;
}