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sortix--sortix/libc/include/__/endian.h
Jonas 'Sortie' Termansen e70887cf3d Add endian.h.
2013-12-17 14:30:27 +01:00

86 lines
2.4 KiB
C

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
__/endian.h
Convert byte ordering of integers.
*******************************************************************************/
#ifndef INCLUDE____ENDIAN_H
#define INCLUDE____ENDIAN_H
#include <features.h>
#include <__/byteswap.h>
__BEGIN_DECLS
/* The compiler provides the type constants. */
#define __LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
#define __PDP_ENDIAN __ORDER_PDP_ENDIAN__
#define __BIG_ENDIAN __ORDER_BIG_ENDIAN__
/* The compiler also provides the local endianness as one of the above. */
#define __BYTE_ORDER __BYTE_ORDER__
#define __FLOAT_WORD_ORDER __FLOAT_WORD_ORDER__
/* Declare conversion macros to allow easy endian conversion. */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __htobe16(x) __bswap_16(x)
#define __htole16(x) (x)
#define __be16toh(x) __bswap_16(x)
#define __le16toh(x) (x)
#define __htobe32(x) __bswap_32(x)
#define __htole32(x) (x)
#define __be32toh(x) __bswap_32(x)
#define __le32toh(x) (x)
#define __htobe64(x) __bswap_64(x)
#define __htole64(x) (x)
#define __be64toh(x) __bswap_64(x)
#define __le64toh(x) (x)
#elif __BYTE_ORDER == __BIG_ENDIAN
#define __htobe16(x) (x)
#define __htole16(x) __bswap_16(x)
#define __be16toh(x) (x)
#define __le16toh(x) __bswap_16(x)
#define __htobe32(x) (x)
#define __htole32(x) __bswap_32(x)
#define __be32toh(x) (x)
#define __le32toh(x) __bswap_32(x)
#define __htobe64(x) (x)
#define __htole64(x) __bswap_64(x)
#define __be64toh(x) (x)
#define __le64toh(x) __bswap_64(x)
#else
#error Your processor uses a weird endian, please add support.
#endif
__END_DECLS
#endif