e299942189
This makes it safe to call sizeof() on an array. Calling sizeof() directly on an array is dangerous, because if the array changes to be a pointer, the behavior will unexpectedly change. It's the same problem as with NITEMS(). Link: <https://stackoverflow.com/a/57537491> Cc: Christian Göttsche <cgzones@googlemail.com> Cc: Serge Hallyn <serge@hallyn.com> Cc: Iker Pedrosa <ipedrosa@redhat.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
25 lines
506 B
C
25 lines
506 B
C
/*
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* SPDX-FileCopyrightText: 2022-2023, Alejandro Colomar <alx@kernel.org>
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SHADOW_INCLUDE_LIBMISC_SIZEOF_H_
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#define SHADOW_INCLUDE_LIBMISC_SIZEOF_H_
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#include <config.h>
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#include <limits.h>
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#include "must_be.h"
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#define WIDTHOF(x) (sizeof(x) * CHAR_BIT)
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#define SIZEOF_ARRAY(a) (sizeof(a) + must_be_array(a))
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#define NITEMS(a) (SIZEOF_ARRAY((a)) / sizeof((a)[0]))
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#define STRLEN(s) (NITEMS(s) - 1)
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#endif // include guard
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