aboutsummaryrefslogtreecommitdiff
path: root/arch/all/core/src/byteswap.c
blob: 3a3f05d2affaf69e10e6d9a75ddf1592c0c6ef13 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
/* ****************************************************************************
 * byteswap.c -- default byte swapping utilities.
 *
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'all/core' module in libcarrot, an experimental
 * modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Lesser Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file. If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#define __NO_BYTESWAP
#include <byteswap.h>
#ifndef __BYTESWAP_SUB16

/**
 *	bswap_16:
 *	16-bit byteswap.
 *
 *	@arg	x	the integer.
 *	@return		the integer with swapped bytes.
 */

__uint16_t bswap_16(__uint16_t x)
{
# ifdef __bswap_16
	return (__bswap_16(x));
# else
	x = (x << 8) | (x >> 8);
	return (x);
# endif
}

#endif /* __BYTESWAP_SUB32 */
#ifndef __BYTESWAP_SUB32

/**
 *	bswap_32:
 *	32-bit byteswap.
 *
 *	@arg	x	the integer.
 *	@return		the integer with swapped bytes.
 */

__uint32_t bswap_32(__uint32_t x)
{
# ifdef __bswap_32
	return (__bswap_32(x));
# else
	x = (x << 16) | (x >> 16);
	x = ((x & 0xFF00FF00) >> 8) | ((x & 0x00FF00FF) << 8);
	return (x);
# endif
}

#endif /* __BYTESWAP_SUB32 */