/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "config.h"

#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_util.h"

/*
 * Round 32-bit unsigned length to the next highest power of two.
 * Always returns at least 64.
 * Algorithm from bit twiddling hacks.
 */
unsigned int
sudo_pow2_roundup_v1(unsigned int len)
{
    if (len < 64)
	return 64;
    len--;
    len |= len >> 1;
    len |= len >> 2;
    len |= len >> 4;
    len |= len >> 8;
    len |= len >> 16;
    len++;
    return len;
}
