Start of a structure.

list.c

@@ -0,0 +1,24 @@
+#include <stdlib.h>
+
+#include "list.h"
+
+void list_head_init(struct list_head *head) {
+	head->next = head->prev = head;
+}
+
+bool list_is_empty(const struct list_head *head) {
+	return head->next == head;
+}
+
+void list_add(struct list_head *new, struct list_head *head) {
+	new->next = head;
+	new->prev = head->prev;
+	new->prev->next = new;
+	head->prev = new;
+}
+
+void list_del(struct list_head *entry) {
+	entry->next->prev = entry->prev;
+	entry->prev->next = entry->next;
+	entry->prev = entry->next = NULL;
+}