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commit c94a5688fb1228a862b2d4a3f1239cdc0e3349e5
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Nov 2 12:14:01 2017 +0100
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<array_length.h>: New array_length and array_end macros
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diff --git a/include/array_length.h b/include/array_length.h
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new file mode 100644
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index 0000000000000000..cb4a8b2a56bca3ad
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--- /dev/null
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+++ b/include/array_length.h
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@@ -0,0 +1,36 @@
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+/* The array_length and array_end macros.
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+ Copyright (C) 2017 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef _ARRAY_LENGTH_H
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+#define _ARRAY_LENGTH_H
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+
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+/* array_length (VAR) is the number of elements in the array VAR. VAR
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+ must evaluate to an array, not a pointer. */
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+#define array_length(var) \
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+ __extension__ ({ \
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+ _Static_assert (!__builtin_types_compatible_p \
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+ (__typeof (var), __typeof (&(var)[0])), \
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+ "argument must be an array"); \
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+ sizeof (var) / sizeof ((var)[0]); \
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+ })
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+
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+/* array_end (VAR) is a pointer one past the end of the array VAR.
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+ VAR must evaluate to an array, not a pointer. */
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+#define array_end(var) (&(var)[array_length (var)])
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+
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+#endif /* _ARRAY_LENGTH_H */
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