Add additional list operations

Add list functions which can efficiently cut down on some bolierplate.
The rest of the code will eventually be cleaned to make use of them.

Signed-off-by: Malfurious <m@lfurio.us>

1 files changed, 7 insertions, 1 deletions

diff --git a/list.h b/list.h
index 7d7a272..2bfa1e1 100644
--- a/list.h
+++ b/list.h
@@ -1,10 +1,16 @@
 #pragma once
-#define LINKEDLIST void *prev, *next
+#define LINKEDLIST void *prev, *next, *listhead
 
 struct list {
     void *tail, *head, *end;
 };
 
 extern void list_init(struct list *list);
+extern int list_empty(struct list *list);
+extern int list_singleton(struct list *list);
+
+extern void *list_circular_prev(void *_node);
+extern void *list_circular_next(void *_node);
+
 extern void list_insert(void *_next, void *_node);
 extern void list_remove(void *_node);