core: queue: implement moving queue entries

this works exactly the same as moving btree nodes.
2026-02-03 14:30:53 +00:00
parent 837a42e249
commit ce9195c130
2 changed files with 27 additions and 5 deletions
--- a/core/queue.c
+++ b/core/queue.c
@@ -102,6 +102,27 @@ struct b_queue_entry *b_queue_pop_back(struct b_queue *q)
 	return x;
 }

+void b_queue_move(b_queue *q, b_queue_entry *dest, b_queue_entry *src)
+{
+	if (src->qe_next) {
+		src->qe_next->qe_prev = dest;
+	}
+
+	if (src->qe_prev) {
+		src->qe_prev->qe_next = dest;
+	}
+
+	if (q->q_first == src) {
+		q->q_first = dest;
+	}
+
+	if (q->q_last == src) {
+		q->q_last = dest;
+	}
+
+	memmove(dest, src, sizeof *src);
+}
+
 void b_queue_delete(struct b_queue *q, struct b_queue_entry *entry)
 {
 	if (!entry) {