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0d40d0ec | 1 | /* Macros and inline functions to swap the order of bytes in integer values. |
d614a753 | 2 | Copyright (C) 1997-2020 Free Software Foundation, Inc. |
1522c368 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
1522c368 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
1522c368 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1522c368 | 18 | |
2f9a1be8 | 19 | #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H |
f4017d20 UD |
20 | # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." |
21 | #endif | |
1522c368 | 22 | |
5c26fecb AJ |
23 | #ifndef _BITS_BYTESWAP_H |
24 | #define _BITS_BYTESWAP_H 1 | |
25 | ||
9904dc47 | 26 | #include <features.h> |
ecd4caf9 | 27 | #include <bits/types.h> |
9904dc47 | 28 | |
0d40d0ec JM |
29 | /* Swap bytes in 16-bit value. */ |
30 | #define __bswap_constant_16(x) \ | |
31 | ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))) | |
a550d3c9 | 32 | |
0d40d0ec JM |
33 | static __inline __uint16_t |
34 | __bswap_16 (__uint16_t __bsx) | |
35 | { | |
36 | #if __GNUC_PREREQ (4, 8) | |
37 | return __builtin_bswap16 (__bsx); | |
38 | #else | |
39 | return __bswap_constant_16 (__bsx); | |
40 | #endif | |
41 | } | |
1522c368 | 42 | |
0d40d0ec JM |
43 | /* Swap bytes in 32-bit value. */ |
44 | #define __bswap_constant_32(x) \ | |
45 | ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) \ | |
46 | | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) | |
a550d3c9 | 47 | |
0d40d0ec JM |
48 | static __inline __uint32_t |
49 | __bswap_32 (__uint32_t __bsx) | |
9904dc47 | 50 | { |
0d40d0ec | 51 | #if __GNUC_PREREQ (4, 3) |
9904dc47 | 52 | return __builtin_bswap32 (__bsx); |
7ce241a0 | 53 | #else |
a550d3c9 | 54 | return __bswap_constant_32 (__bsx); |
7ce241a0 | 55 | #endif |
0d40d0ec | 56 | } |
1522c368 | 57 | |
0d40d0ec JM |
58 | /* Swap bytes in 64-bit value. */ |
59 | #define __bswap_constant_64(x) \ | |
60 | ((((x) & 0xff00000000000000ull) >> 56) \ | |
61 | | (((x) & 0x00ff000000000000ull) >> 40) \ | |
62 | | (((x) & 0x0000ff0000000000ull) >> 24) \ | |
63 | | (((x) & 0x000000ff00000000ull) >> 8) \ | |
64 | | (((x) & 0x00000000ff000000ull) << 8) \ | |
65 | | (((x) & 0x0000000000ff0000ull) << 24) \ | |
66 | | (((x) & 0x000000000000ff00ull) << 40) \ | |
67 | | (((x) & 0x00000000000000ffull) << 56)) | |
3d7f417b | 68 | |
0d40d0ec | 69 | __extension__ static __inline __uint64_t |
ecd4caf9 | 70 | __bswap_64 (__uint64_t __bsx) |
9904dc47 | 71 | { |
0d40d0ec | 72 | #if __GNUC_PREREQ (4, 3) |
9904dc47 | 73 | return __builtin_bswap64 (__bsx); |
6a57d931 | 74 | #else |
b1aa60f3 | 75 | return __bswap_constant_64 (__bsx); |
1522c368 | 76 | #endif |
0d40d0ec | 77 | } |
5c26fecb AJ |
78 | |
79 | #endif /* _BITS_BYTESWAP_H */ |