local/libqueue: new aport

1 files changed, 49 insertions, 0 deletions

diff --git a/libqueue/queue/stq.h b/libqueue/queue/stq.h
new file mode 100644
index 0000000..dcf5c85
--- /dev/null
+++ b/libqueue/queue/stq.h
@@ -0,0 +1,49 @@
+/* vim: set ts=4 sw=4 ai:
+ * stq.h -- singly linked tail queue implementation derived from NetBSD's queue.h
+ */
+
+#ifndef STQ_H
+#define STQ_H
+
+struct stqe {
+	void *data;
+	struct stqe *next;
+};
+
+struct stqh {
+	struct stqe *first;
+	struct stqe **last;
+};
+
+#define stq_first(hd) ((hd)->first)
+#define stq_last(hd) (*(((struct stqh *)(void *)((hd)->last))->last))
+#define stq_next(e) ((e)->next)
+#define stq_empty(hd) (((hd)->first) == NULL)
+#define stq_init(hd) do { \
+	(hd)->first = NULL; \
+	(hd)->last = &(hd)->first; \
+} while (0)
+
+
+#define stq_foreach(var,head) \
+	for ((var) = stq_first((head)); \
+		(var); \
+		(var) = stq_next((var)))
+
+#define stq_foreach_safe(var,head,vnext) \
+	for ((var) = stq_first((head)); \
+		(var) && ((vnext) = stq_next((var)),1); \
+		(var) = (vnext))
+
+struct stqh *stq_new(void);
+struct stqe *stq_elem_new(void *);
+void stq_insert_head(struct stqh *, struct stqe *);
+void stq_insert_tail(struct stqh *, struct stqe *);
+void stq_insert_after(struct stqh *, struct stqe *, struct stqe *);
+void stq_remove_head(struct stqh *);
+void stq_remove(struct stqh *, struct stqe *);
+void stq_concat(struct stqh *, struct stqh *);
+void stq_cleanup(struct stqh *, void (*)(void *));
+struct stqe *stq_find_from_data(struct stqh *, const void *, int (*)(const void *, const void *));
+
+#endif/*!STQ_H*/