| /* Macros to swap the order of bytes in integer values. |
| Copyright (C) 1997-2014 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) \ |
| ((unsigned short int)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))) |
| |
| /* Get __bswap_16. */ |
| #include <bits/byteswap-16.h> |
| |
| /* Swap bytes in 32 bit value. */ |
| #define __bswap_constant_32(x) \ |
| ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ |
| (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) |
| |
| #ifdef __GNUC__ |
| # if __GNUC_PREREQ (4, 3) |
| static __inline unsigned int |
| __bswap_32 (unsigned int __bsx) |
| { |
| return __builtin_bswap32 (__bsx); |
| } |
| # else |
| # define __bswap_32(x) \ |
| (__extension__ \ |
| ({ unsigned int __bsx = (x); __bswap_constant_32 (__bsx); })) |
| # endif |
| #else |
| static __inline unsigned int |
| __bswap_32 (unsigned int __bsx) |
| { |
| return __bswap_constant_32 (__bsx); |
| } |
| #endif |
| |
| /* Swap bytes in 64 bit value. */ |
| #if __GNUC_PREREQ (2, 0) |
| # define __bswap_constant_64(x) \ |
| (__extension__ ((((x) & 0xff00000000000000ull) >> 56) \ |
| | (((x) & 0x00ff000000000000ull) >> 40) \ |
| | (((x) & 0x0000ff0000000000ull) >> 24) \ |
| | (((x) & 0x000000ff00000000ull) >> 8) \ |
| | (((x) & 0x00000000ff000000ull) << 8) \ |
| | (((x) & 0x0000000000ff0000ull) << 24) \ |
| | (((x) & 0x000000000000ff00ull) << 40) \ |
| | (((x) & 0x00000000000000ffull) << 56))) |
| |
| # if __GNUC_PREREQ (4, 3) |
| static __inline __uint64_t |
| __bswap_64 (__uint64_t __bsx) |
| { |
| return __builtin_bswap64 (__bsx); |
| } |
| # else |
| # define __bswap_64(x) \ |
| (__extension__ \ |
| ({ union { __extension__ __uint64_t __ll; \ |
| unsigned int __l[2]; } __w, __r; \ |
| if (__builtin_constant_p (x)) \ |
| __r.__ll = __bswap_constant_64 (x); \ |
| else \ |
| { \ |
| __w.__ll = (x); \ |
| __r.__l[0] = __bswap_32 (__w.__l[1]); \ |
| __r.__l[1] = __bswap_32 (__w.__l[0]); \ |
| } \ |
| __r.__ll; })) |
| # endif |
| #else |
| # 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)) |
| |
| static __inline __uint64_t |
| __bswap_64 (__uint64_t __bsx) |
| { |
| return __bswap_constant_64 (__bsx); |
| } |
| #endif |
| |
| #endif /* _BITS_BYTESWAP_H */ |