source: GPL/trunk/include/linux/overflow.h@ 679

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
#ifndef __LINUX_OVERFLOW_H
#define __LINUX_OVERFLOW_H

#include <linux/compiler.h>

/**
 * array_size() - Calculate size of 2-dimensional array.
 *
 * @a: dimension one
 * @b: dimension two
 *
 * Calculates size of 2-dimensional array: @a * @b.
 *
 * Returns: number of bytes needed to represent the array or SIZE_MAX on
 * overflow.
 */
static inline __must_check size_t array_size(size_t a, size_t b)
{
        size_t bytes;

        bytes = a * b;

        return bytes;
}

/**
 * array3_size() - Calculate size of 3-dimensional array.
 *
 * @a: dimension one
 * @b: dimension two
 * @c: dimension three
 *
 * Calculates size of 3-dimensional array: @a * @b * @c.
 *
 * Returns: number of bytes needed to represent the array or SIZE_MAX on
 * overflow.
 */
static inline __must_check size_t array3_size(size_t a, size_t b, size_t c)
{
        size_t bytes;

        bytes = a * b * c;

        return bytes;
}

#endif /* __LINUX_OVERFLOW_H */