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-rw-r--r--mru.c50
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;
+}