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diff --git a/src/rda_util.h b/src/rda_util.h
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+/* -*- Mode: C; c-set-style: linux indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+
+/* rda_util.h - Miscellaneous helpers
+
+   Copyright (C) 2023 Mihai Moldovan <ionic@ionic.de>
+   All rights reserved.
+
+   The RDA Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The RDA Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the Mate Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+ */
+
+#ifndef RDA_UTIL_H
+#define RDA_UTIL_H
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+#define static_arr_size(arr) (sizeof(arr) / sizeof(*arr))
+
+G_END_DECLS
+
+#endif /* RDA_UTIL_H */