| /* Macros and inline functions to swap the order of bytes in integer values. |
| Copyright (C) 1997-2019 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library 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 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H |
| # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." |
| #endif |
| |
| #ifndef _BITS_BYTESWAP_H |
| #define _BITS_BYTESWAP_H 1 |
| |
| #include <features.h> |
| #include <bits/types.h> |
| |
| /* Swap bytes in 16-bit value. */ |
| #define __bswap_constant_16(x) \ |
| ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))) |
| |
| static __inline __uint16_t |
| __bswap_16 (__uint16_t __bsx) |
| { |
| #if __GNUC_PREREQ (4, 8) |
| return __builtin_bswap16 (__bsx); |
| #else |
| return __bswap_constant_16 (__bsx); |
| #endif |
| } |
| |
| /* Swap bytes in 32-bit value. */ |
| #define __bswap_constant_32(x) \ |
| ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) \ |
| | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) |
| |
| static __inline __uint32_t |
| __bswap_32 (__uint32_t __bsx) |
| { |
| #if __GNUC_PREREQ (4, 3) |
| return __builtin_bswap32 (__bsx); |
| #else |
| return __bswap_constant_32 (__bsx); |
| #endif |
| } |
| |
| /* Swap bytes in 64-bit value. */ |
| #define __bswap_constant_64(x) \ |
| ((((x) & 0xff00000000000000ull) >> 56) \ |
| | (((x) & 0x00ff000000000000ull) >> 40) \ |
| | (((x) & 0x0000ff0000000000ull) >> 24) \ |
| | (((x) & 0x000000ff00000000ull) >> 8) \ |
| | (((x) & 0x00000000ff000000ull) << 8) \ |
| | (((x) & 0x0000000000ff0000ull) << 24) \ |
| | (((x) & 0x000000000000ff00ull) << 40) \ |
| | (((x) & 0x00000000000000ffull) << 56)) |
| |
| __extension__ static __inline __uint64_t |
| __bswap_64 (__uint64_t __bsx) |
| { |
| #if __GNUC_PREREQ (4, 3) |
| return __builtin_bswap64 (__bsx); |
| #else |
| return __bswap_constant_64 (__bsx); |
| #endif |
| } |
| |
| #endif /* _BITS_BYTESWAP_H */ |