1 files changed, 33 insertions, 0 deletions
diff --git a/list.h b/list.h
new file mode 100644
index 0000000..738c6ce
--- /dev/null
+++ b/list.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdlib.h>
+
+#define OFFSET(type, attr) ((size_t) &((type *)0)->attr)
+#define UPCAST(ptr, type) ({ \
+	const typeof( ((type *)0)->link ) *__mptr = (ptr); \
+	(type *)( (char *)__mptr - OFFSET(type, link) ); })
+
+#define LIST_HEAD ((struct link) { .prev = NULL, .next = NULL })
+#define LINK_EMPTY ((struct link) { 0 })
+
+#define LINK(p) (&(p)->link)
+
+struct link {
+	struct link *prev;
+	struct link *next;
+};
+
+/* list_XXX functions operate on the list head */
+
+int list_len(struct link *head);
+int list_ffind(struct link *head, struct link *link);
+
+struct link *link_back(struct link *list);
+void link_prepend(struct link *list, struct link *link);
+void link_append(struct link *list, struct link *link);
+struct link *link_pop(struct link *link);
+
+struct link *link_iter(struct link *link, int n);
+
+void list_push_back(struct link *list, struct link *link);
+