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125 lines
3 KiB
C
125 lines
3 KiB
C
/* @(#)btorder.h 1.22 12/12/03 Copyright 1996-2012 J. Schilling */
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/*
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* Definitions for Bit and Byte ordering
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*
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* Copyright (c) 1996-2012 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#ifndef _SCHILY_BTORDER_H
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#define _SCHILY_BTORDER_H
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#ifndef _SCHILY_MCONFIG_H
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#include <schily/mconfig.h> /* load bit/byte-oder from xmconfig.h */
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#endif
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#ifndef _SCHILY_TYPES_H
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#include <schily/types.h> /* try to load isa_defs.h on Solaris */
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#endif
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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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* Convert bit-order definitions from xconfig.h into our values
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* and verify them.
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*/
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#if defined(HAVE_C_BITFIELDS) && \
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defined(BITFIELDS_LTOH)
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#define _BIT_FIELDS_LTOH
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#endif
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#if defined(HAVE_C_BITFIELDS) && \
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defined(BITFIELDS_HTOL)
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#define _BIT_FIELDS_HTOL
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#endif
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#if defined(HAVE_C_BITFIELDS) && \
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!defined(BITFIELDS_HTOL)
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#define BITFIELDS_LTOH
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#define _BIT_FIELDS_LTOH
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#endif
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#if defined(_BIT_FIELDS_LTOH) && defined(_BIT_FIELDS_HTOL)
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/*
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* #error will not work for all compilers (e.g. sunos4)
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* The following line will abort compilation on all compilers
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* if none of the above is defined. And that's what we want.
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*/
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error Only one of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL may be defined
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#include <schily/err_bit.h> /* Avoid "unknown directive" with K&R */
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#endif
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/*
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* Convert byte-order definitions from xconfig.h into our values
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* and verify them.
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* Note that we cannot use the definitions _LITTLE_ENDIAN and _BIG_ENDIAN
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* because they are used on IRIX-6.5 with different meaning.
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*/
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#if defined(HAVE_C_BIGENDIAN) && \
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!defined(WORDS_BIGENDIAN)
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#define WORDS_LITTLEENDIAN
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/* #define _LITTLE_ENDIAN */
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#endif
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#if defined(HAVE_C_BIGENDIAN) && \
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defined(WORDS_BIGENDIAN)
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#undef WORDS_LITTLEENDIAN
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/* #define _BIG_ENDIAN */
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#endif
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#if defined(_BIT_FIELDS_LTOH) || defined(_BIT_FIELDS_HTOL)
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/*
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* Bitorder is already known.
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*/
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#else
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/*
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* Bitorder not yet known.
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*/
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# if defined(sun3) || defined(mc68000) || \
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defined(sun4) || defined(__sparc) || defined(sparc) || \
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defined(__hppa) || defined(_ARCH_PPC) || defined(_IBMR2)
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# define _BIT_FIELDS_HTOL
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# endif
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# if defined(__sgi) && defined(__mips)
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# define _BIT_FIELDS_HTOL
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# endif
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# if defined(__i386__) || defined(__i386) || defined(i386) || \
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defined(__alpha__) || defined(__alpha) || defined(alpha) || \
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defined(__arm__) || defined(__arm) || defined(arm)
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# define _BIT_FIELDS_LTOH
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# endif
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# if defined(__ppc__) || defined(ppc) || defined(__ppc) || \
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defined(__PPC) || defined(powerpc) || defined(__powerpc__)
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# if defined(__BIG_ENDIAN__)
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# define _BIT_FIELDS_HTOL
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# else
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# define _BIT_FIELDS_LTOH
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# endif
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# endif
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SCHILY_BTORDER_H */
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