64 bit ntohl() in C++?

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Documentation: man htobe64 on Linux (glibc >= 2.9) or FreeBSD.

Unfortunately OpenBSD, FreeBSD and glibc (Linux) did not quite work together smoothly to create one (non-kernel-API) libc standard for this, during an attempt in 2009.

Currently, this short bit of preprocessor code:

#if defined(__linux__)
#  include <endian.h>
#elif defined(__FreeBSD__) || defined(__NetBSD__)
#  include <sys/endian.h>
#elif defined(__OpenBSD__)
#  include <sys/types.h>
#  define be16toh(x) betoh16(x)
#  define be32toh(x) betoh32(x)
#  define be64toh(x) betoh64(x)
#endif

(tested on Linux and OpenBSD) should hide the differences. It gives you the Linux/FreeBSD-style macros on those 4 platforms.

Use example:

  #include <stdint.h>    // For 'uint64_t'

  uint64_t  host_int = 123;
  uint64_t  big_endian;

  big_endian = htobe64( host_int );
  host_int = be64toh( big_endian );

It’s the most “standard C library”-ish approach available at the moment.

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