The POSIX standard doesn't currently define a `nothll`/`htonll` function pair to perform network-to-host and host-to-network swaps of 64-bit data. These 64-bit swaps are necessary for the on-disk storage of EWAH bitmaps if they are not in native byte order. --- git-compat-util.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/git-compat-util.h b/git-compat-util.h index ff193f4..bc9b591 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -710,4 +710,32 @@ void warn_on_inaccessible(const char *path); /* Get the passwd entry for the UID of the current process. */ struct passwd *xgetpwuid_self(void); +#include <endian.h> + +#ifndef __BYTE_ORDER +# if defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) +# define __BYTE_ORDER BYTE_ORDER +# define __LITTLE_ENDIAN LITTLE_ENDIAN +# define __BIG_ENDIAN BIG_ENDIAN +# else +# error "Cannot determine endianness" +# endif +#endif + +#if __BYTE_ORDER == __BIG_ENDIAN +# define ntohll(n) (n) +# define htonll(n) (n) +#elif __BYTE_ORDER == __LITTLE_ENDIAN +# if defined(__GNUC__) && defined(__GLIBC__) +# include <byteswap.h> +# define ntohll(n) bswap_64(n) +# define htonll(n) bswap_64(n) +# else /* GNUC & GLIBC */ +# define ntohll(n) ( (((unsigned long long)ntohl(n)) << 32) + ntohl(n >> 32) ) +# define htonll(n) ( (((unsigned long long)htonl(n)) << 32) + htonl(n >> 32) ) +# endif /* GNUC & GLIBC */ +#else /* __BYTE_ORDER */ +# error "Can't define htonll or ntohll!" +#endif + #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html