1 files changed, 209 insertions, 0 deletions
diff --git a/base/data-struct/list.h b/base/data-struct/list.h
new file mode 100644
index 000000000..1a107d180
--- /dev/null
+++ b/base/data-struct/list.h
@@ -0,0 +1,209 @@
+#ifndef BASE_DATA_STRUCT_LIST_H
+#define BASE_DATA_STRUCT_LIST_H
+
+//----------------------------------------------------------------
+
+/*
+ * A list consists of a list head plus elements.
+ * Each element has 'next' and 'previous' pointers.
+ * The list head's pointers point to the first and the last element.
+ */
+
+struct dm_list {
+	struct dm_list *n, *p;
+};
+
+/*
+ * String list.
+ */
+struct dm_str_list {
+	struct dm_list list;
+	const char *str;
+};
+
+/*
+ * Initialise a list before use.
+ * The list head's next and previous pointers point back to itself.
+ */
+#define DM_LIST_HEAD_INIT(name)	 { &(name), &(name) }
+#define DM_LIST_INIT(name)	struct dm_list name = DM_LIST_HEAD_INIT(name)
+void dm_list_init(struct dm_list *head);
+
+/*
+ * Insert an element before 'head'.
+ * If 'head' is the list head, this adds an element to the end of the list.
+ */
+void dm_list_add(struct dm_list *head, struct dm_list *elem);
+
+/*
+ * Insert an element after 'head'.
+ * If 'head' is the list head, this adds an element to the front of the list.
+ */
+void dm_list_add_h(struct dm_list *head, struct dm_list *elem);
+
+/*
+ * Delete an element from its list.
+ * Note that this doesn't change the element itself - it may still be safe
+ * to follow its pointers.
+ */
+void dm_list_del(struct dm_list *elem);
+
+/*
+ * Remove an element from existing list and insert before 'head'.
+ */
+void dm_list_move(struct dm_list *head, struct dm_list *elem);
+
+/*
+ * Join 'head1' to the end of 'head'.
+ */
+void dm_list_splice(struct dm_list *head, struct dm_list *head1);
+
+/*
+ * Is the list empty?
+ */
+int dm_list_empty(const struct dm_list *head);
+
+/*
+ * Is this the first element of the list?
+ */
+int dm_list_start(const struct dm_list *head, const struct dm_list *elem);
+
+/*
+ * Is this the last element of the list?
+ */
+int dm_list_end(const struct dm_list *head, const struct dm_list *elem);
+
+/*
+ * Return first element of the list or NULL if empty
+ */
+struct dm_list *dm_list_first(const struct dm_list *head);
+
+/*
+ * Return last element of the list or NULL if empty
+ */
+struct dm_list *dm_list_last(const struct dm_list *head);
+
+/*
+ * Return the previous element of the list, or NULL if we've reached the start.
+ */
+struct dm_list *dm_list_prev(const struct dm_list *head, const struct dm_list *elem);
+
+/*
+ * Return the next element of the list, or NULL if we've reached the end.
+ */
+struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *elem);
+
+/*
+ * Given the address v of an instance of 'struct dm_list' called 'head'
+ * contained in a structure of type t, return the containing structure.
+ */
+#define dm_list_struct_base(v, t, head) \
+    ((t *)((const char *)(v) - (const char *)&((t *) 0)->head))
+
+/*
+ * Given the address v of an instance of 'struct dm_list list' contained in
+ * a structure of type t, return the containing structure.
+ */
+#define dm_list_item(v, t) dm_list_struct_base((v), t, list)
+
+/*
+ * Given the address v of one known element e in a known structure of type t,
+ * return another element f.
+ */
+#define dm_struct_field(v, t, e, f) \
+    (((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f)
+
+/*
+ * Given the address v of a known element e in a known structure of type t,
+ * return the list head 'list'
+ */
+#define dm_list_head(v, t, e) dm_struct_field(v, t, e, list)
+
+/*
+ * Set v to each element of a list in turn.
+ */
+#define dm_list_iterate(v, head) \
+	for (v = (head)->n; v != head; v = v->n)
+
+/*
+ * Set v to each element in a list in turn, starting from the element
+ * in front of 'start'.
+ * You can use this to 'unwind' a list_iterate and back out actions on
+ * already-processed elements.
+ * If 'start' is 'head' it walks the list backwards.
+ */
+#define dm_list_uniterate(v, head, start) \
+	for (v = (start)->p; v != head; v = v->p)
+
+/*
+ * A safe way to walk a list and delete and free some elements along
+ * the way.
+ * t must be defined as a temporary variable of the same type as v.
+ */
+#define dm_list_iterate_safe(v, t, head) \
+	for (v = (head)->n, t = v->n; v != head; v = t, t = v->n)
+
+/*
+ * Walk a list, setting 'v' in turn to the containing structure of each item.
+ * The containing structure should be the same type as 'v'.
+ * The 'struct dm_list' variable within the containing structure is 'field'.
+ */
+#define dm_list_iterate_items_gen(v, head, field) \
+	for (v = dm_list_struct_base((head)->n, __typeof__(*v), field); \
+	     &v->field != (head); \
+	     v = dm_list_struct_base(v->field.n, __typeof__(*v), field))
+
+/*
+ * Walk a list, setting 'v' in turn to the containing structure of each item.
+ * The containing structure should be the same type as 'v'.
+ * The list should be 'struct dm_list list' within the containing structure.
+ */
+#define dm_list_iterate_items(v, head) dm_list_iterate_items_gen(v, (head), list)
+
+/*
+ * Walk a list, setting 'v' in turn to the containing structure of each item.
+ * The containing structure should be the same type as 'v'.
+ * The 'struct dm_list' variable within the containing structure is 'field'.
+ * t must be defined as a temporary variable of the same type as v.
+ */
+#define dm_list_iterate_items_gen_safe(v, t, head, field) \
+	for (v = dm_list_struct_base((head)->n, __typeof__(*v), field), \
+	     t = dm_list_struct_base(v->field.n, __typeof__(*v), field); \
+	     &v->field != (head); \
+	     v = t, t = dm_list_struct_base(v->field.n, __typeof__(*v), field))
+/*
+ * Walk a list, setting 'v' in turn to the containing structure of each item.
+ * The containing structure should be the same type as 'v'.
+ * The list should be 'struct dm_list list' within the containing structure.
+ * t must be defined as a temporary variable of the same type as v.
+ */
+#define dm_list_iterate_items_safe(v, t, head) \
+	dm_list_iterate_items_gen_safe(v, t, (head), list)
+
+/*
+ * Walk a list backwards, setting 'v' in turn to the containing structure
+ * of each item.
+ * The containing structure should be the same type as 'v'.
+ * The 'struct dm_list' variable within the containing structure is 'field'.
+ */
+#define dm_list_iterate_back_items_gen(v, head, field) \
+	for (v = dm_list_struct_base((head)->p, __typeof__(*v), field); \
+	     &v->field != (head); \
+	     v = dm_list_struct_base(v->field.p, __typeof__(*v), field))
+
+/*
+ * Walk a list backwards, setting 'v' in turn to the containing structure
+ * of each item.
+ * The containing structure should be the same type as 'v'.
+ * The list should be 'struct dm_list list' within the containing structure.
+ */
+#define dm_list_iterate_back_items(v, head) dm_list_iterate_back_items_gen(v, (head), list)
+
+/*
+ * Return the number of elements in a list by walking it.
+ */
+unsigned int dm_list_size(const struct dm_list *head);
+
+//----------------------------------------------------------------
+
+#endif