| /* Copyright 2014 Jozsef Kadlecsik (kadlec@blackhole.kfki.hu) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #ifndef LIBIPSET_COMPAT_H |
| #define LIBIPSET_COMPAT_H |
| |
| #ifndef be64toh |
| |
| #include <endian.h> |
| /* Swap bytes in 64 bit value. */ |
| #if __BYTE_ORDER == __LITTLE_ENDIAN |
| /* From bits/byteswap.h in eglibc source: */ |
| #define __bswap_constant_32(x) \ |
| ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ |
| (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) |
| |
| #ifdef __GNUC__ |
| # define __bswap_32(x) \ |
| (__extension__ \ |
| ({ register unsigned int __bsx = (x); __bswap_constant_32 (__bsx); })) |
| #else |
| static __inline unsigned int |
| __bswap_32 (unsigned int __bsx) |
| { |
| return __bswap_constant_32 (__bsx); |
| } |
| #endif |
| |
| #if defined __GNUC__ && __GNUC__ >= 2 |
| /* 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)) |
| |
| # define __bswap_64(x) \ |
| (__extension__ \ |
| ({ union { __extension__ unsigned long long int __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; })) |
| #else |
| #error "Unsupported, you need at least gcc 3.x" |
| #endif |
| |
| #define be64toh(x) __bswap_64(x) |
| #define htobe64(x) __bswap_64(x) |
| #else |
| #define be64toh(x) (x) |
| #define htobe64(x) (x) |
| #endif |
| |
| #endif |
| |
| #endif /* LIBIPSET_COMPAT_H */ |