1 files changed, 50 insertions, 0 deletions
diff --git a/mru.c b/mru.c
new file mode 100644
index 0000000000..9dedae0287
--- /dev/null
+++ b/mru.c
@@ -0,0 +1,50 @@
+#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;
+}