diff --git a/lib/alist.c b/lib/alist.c
index 7730fe0..1a4b4fb 100644
--- a/lib/alist.c
+++ b/lib/alist.c
@@ -118,6 +118,13 @@
 	return index;
 }
 
+bool alist_chk_ptr(const struct alist *lst, const void *ptr)
+{
+	int index = alist_calc_index(lst, ptr);
+
+	return index >= 0 && index < lst->count;
+}
+
 const void *alist_next_ptrd(const struct alist *lst, const void *ptr)
 {
 	int index = alist_calc_index(lst, ptr);