120 lines
3.2 KiB
Plaintext
120 lines
3.2 KiB
Plaintext
/* @(#)btorder.h 1.16 03/06/15 Copyright 1996 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 J. Schilling
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _BTORDER_H
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#define _BTORDER_H
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#ifndef _INCL_SYS_TYPES_H
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#include <sys/types.h> /* try to load isa_defs.h on Solaris */
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#define _INCL_SYS_TYPES_H
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#endif
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#ifndef _MCONFIG_H
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#include <mconfig.h> /* load bit/byte-oder from xmconfig.h*/
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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 defines. 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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#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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#endif /* _BTORDER_H */
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