epoc32/include/stdapis/machine/endian.h
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:33:34 +0100
branchSymbian3
changeset 4 837f303aceeb
parent 0 061f57f2323e
permissions -rw-r--r--
Current Symbian^3 public API header files (from PDK 3.0.h)
This is the epoc32/include tree with the "platform" subtrees removed, and
all but a selected few mbg and rsg files removed.
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/*-
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 * Copyright (c) 1987, 1991 Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *	@(#)endian.h	7.8 (Berkeley) 4/3/91
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 * $FreeBSD: src/sys/i386/include/endian.h,v 1.41 2005/03/02 21:33:26 joerg Exp $
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 */
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#ifndef _MACHINE_ENDIAN_H_
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#define	_MACHINE_ENDIAN_H_
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#include <sys/cdefs.h>
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#include <sys/_types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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 * Define the order of 32-bit words in 64-bit words.
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 */
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#define	_QUAD_HIGHWORD 1
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#define	_QUAD_LOWWORD 0
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/*
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 * Definitions for byte order, according to byte significance from low
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 * address to high.
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 */
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#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
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#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
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#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
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#define	_BYTE_ORDER	_LITTLE_ENDIAN
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/*
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 * Deprecated variants that don't have enough underscores to be useful in more
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 * strict namespaces.
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 */
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#if __BSD_VISIBLE
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#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
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#define	BIG_ENDIAN	_BIG_ENDIAN
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#define	PDP_ENDIAN	_PDP_ENDIAN
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#define	BYTE_ORDER	_BYTE_ORDER
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#endif
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#ifdef __SYMBIAN32__
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#define	_BYTEORDER_FUNC_DEFINED
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#else /* __SYMBIAN32__ */
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#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
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#define __word_swap_int_var(x) \
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__extension__ ({ register __uint32_t __X = (x); \
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   __asm ("rorl $16, %0" : "+r" (__X)); \
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   __X; })
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#ifdef __OPTIMIZE__
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#define	__word_swap_int_const(x) \
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	((((x) & 0xffff0000) >> 16) | \
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	 (((x) & 0x0000ffff) << 16))
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#define	__word_swap_int(x) (__builtin_constant_p(x) ? \
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	__word_swap_int_const(x) : __word_swap_int_var(x))
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#else	/* __OPTIMIZE__ */
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#define	__word_swap_int(x) __word_swap_int_var(x)
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#endif	/* __OPTIMIZE__ */
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#define __byte_swap_int_var(x) \
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__extension__ ({ register __uint32_t __X = (x); \
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   __asm ("bswap %0" : "+r" (__X)); \
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   __X; })
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#ifdef __OPTIMIZE__
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#define	__byte_swap_int_const(x) \
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	((((x) & 0xff000000) >> 24) | \
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	 (((x) & 0x00ff0000) >>  8) | \
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	 (((x) & 0x0000ff00) <<  8) | \
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	 (((x) & 0x000000ff) << 24))
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#define	__byte_swap_int(x) (__builtin_constant_p(x) ? \
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	__byte_swap_int_const(x) : __byte_swap_int_var(x))
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#else	/* __OPTIMIZE__ */
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#define	__byte_swap_int(x) __byte_swap_int_var(x)
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#endif	/* __OPTIMIZE__ */
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#define __byte_swap_word_var(x) \
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__extension__ ({ register __uint16_t __X = (x); \
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   __asm ("xchgb %h0, %b0" : "+q" (__X)); \
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   __X; })
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#ifdef __OPTIMIZE__
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#define	__byte_swap_word_const(x) \
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	((((x) & 0xff00) >> 8) | \
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	 (((x) & 0x00ff) << 8))
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#define	__byte_swap_word(x) (__builtin_constant_p(x) ? \
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	__byte_swap_word_const(x) : __byte_swap_word_var(x))
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#else	/* __OPTIMIZE__ */
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#define	__byte_swap_word(x) __byte_swap_word_var(x)
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#endif	/* __OPTIMIZE__ */
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static __inline __uint64_t
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__bswap64(__uint64_t _x)
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{
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	return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
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	    ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
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	    ((_x << 24) & ((__uint64_t)0xff << 40)) |
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	    ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
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}
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static __inline __uint32_t
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__bswap32(__uint32_t _x)
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{
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	return (__byte_swap_int(_x));
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}
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static __inline __uint16_t
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__bswap16(__uint16_t _x)
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{
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	return (__byte_swap_word(_x));
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}
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#define	__htonl(x)	__bswap32(x)
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#define	__htons(x)	__bswap16(x)
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#define	__ntohl(x)	__bswap32(x)
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#define	__ntohs(x)	__bswap16(x)
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#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
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/*
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 * No optimizations are available for this compiler.  Fall back to
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 * non-optimized functions by defining the constant usually used to prevent
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 * redefinition.
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 */
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#define	_BYTEORDER_FUNC_DEFINED
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#endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
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#endif /* __SYMBIAN32__ */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !_MACHINE_ENDIAN_H_ */