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/*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#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.
*/
unsigned int
sudo_pow2_roundup_v1(unsigned int len)
{
if (len < 64)
return 64;
#ifdef HAVE___BUILTIN_CLZ
return 1U << (32 - __builtin_clz(len - 1));
#else
len--;
len |= len >> 1;
len |= len >> 2;
len |= len >> 4;
len |= len >> 8;
len |= len >> 16;
len++;
return len;
#endif
}
/*
* Round a size_t length to the next highest power of two.
* Always returns at least 64.
*/
size_t
sudo_pow2_roundup_v2(size_t len)
{
if (len < 64)
return 64;
#if defined(__LP64__) && defined(HAVE___BUILTIN_CLZL)
return 1UL << (64 - __builtin_clzl(len - 1));
#elif !defined(__LP64__) && defined(HAVE___BUILTIN_CLZ)
return 1U << (32 - __builtin_clz(len - 1));
#else
len--;
len |= len >> 1;
len |= len >> 2;
len |= len >> 4;
len |= len >> 8;
len |= len >> 16;
# ifdef __LP64__
len |= len >> 32;
# endif
len++;
return len;
#endif
}
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