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$FreeBSD: releng/10.2/share/man/man9/byteorder.9 235693 2012-05-20 16:43:47Z gjb $
.Dd April 29, 2002 .Dt BYTEORDER 9 .Os .Sh NAME .Nm bswap16 , bswap32 , bswap64 , .Nm be16toh , be32toh , be64toh , htobe16 , htobe32 , htobe64 , .Nm htole16 , htole32 , htole64 , le16toh , le32toh , le64toh , .Nm be16enc , be16dec , be32enc , be32dec , be64enc , be64dec , .Nm le16enc , le16dec , le32enc , le32dec , le64enc , le64dec .Nd byte order operations .Sh SYNOPSIS n sys/endian.h .Ft uint16_t .Fn bswap16 "uint16_t int16" .Ft uint32_t .Fn bswap32 "uint32_t int32" .Ft uint64_t .Fn bswap64 "uint64_t int64" .Ft uint16_t .Fn be16toh "uint16_t big16" .Ft uint32_t .Fn be32toh "uint32_t big32" .Ft uint64_t .Fn be64toh "uint64_t big64" .Ft uint16_t .Fn htobe16 "uint16_t host16" .Ft uint32_t .Fn htobe32 "uint32_t host32" .Ft uint64_t .Fn htobe64 "uint64_t host64" .Ft uint16_t .Fn htole16 "uint16_t host16" .Ft uint32_t .Fn htole32 "uint32_t host32" .Ft uint64_t .Fn htole64 "uint64_t host64" .Ft uint16_t .Fn le16toh "uint16_t little16" .Ft uint32_t .Fn le32toh "uint32_t little32" .Ft uint64_t .Fn le64toh "uint64_t little64" .Ft uint16_t .Fn be16dec "const void *" .Ft uint32_t .Fn be32dec "const void *" .Ft uint64_t .Fn be64dec "const void *" .Ft uint16_t .Fn le16dec "const void *" .Ft uint32_t .Fn le32dec "const void *" .Ft uint64_t .Fn le64dec "const void *" .Ft void .Fn be16enc "void *" uint16_t .Ft void .Fn be32enc "void *" uint32_t .Ft void .Fn be64enc "void *" uint64_t .Ft void .Fn le16enc "void *" uint16_t .Ft void .Fn le32enc "void *" uint32_t .Ft void .Fn le64enc "void *" uint64_t .Sh DESCRIPTION The .Fn bswap16 , .Fn bswap32 , and .Fn bswap64 functions return a byte order swapped integer. On big endian systems, the number is converted to little endian byte order. On little endian systems, the number is converted to big endian byte order.
p The .Fn be16toh , .Fn be32toh , and .Fn be64toh functions return a big endian byte ordered integer converted to the system's native byte order. The return value will be the same as the argument on big endian systems.
p The .Fn le16toh , .Fn le32toh , and .Fn le64toh functions return a little endian byte ordered integer converted to the system's native byte order. The return value will be the same as the argument on little endian systems.
p The .Fn htobe16 , .Fn htobe32 , and .Fn htobe64 functions return an integer in the system's native byte order converted to big endian byte order. The return value will be the same as the argument on big endian systems.
p The .Fn htole16 , .Fn htole32 , and .Fn htole64 functions return a integer in the system's native byte order converted to little endian byte order. The return value will be the same as the argument on little endian systems.
p The .Fn be16enc , .Fn be16dec , .Fn be32enc , .Fn be32dec , .Fn be64enc , .Fn be64dec , .Fn le16enc , .Fn le16dec , .Fn le32enc , .Fn le32dec , .Fn le64enc , and .Fn le64dec functions encode and decode integers to/from byte strings on any alignment in big/little endian format. .Sh SEE ALSO .Xr byteorder 3 .Sh HISTORY The .Fn hto* and .Fn *toh functions first appeared in .Fx 5.0 , and were originally developed by the .Nx project.