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47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/* `NAN' constant for IEEE 754 machines.
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Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _NAN_H
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#define _NAN_H 1
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/* IEEE Not A Number. */
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#include <endian.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define __nan_bytes { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 }
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#endif
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define __nan_bytes { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f }
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#endif
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#ifdef __GNUC__
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#define NAN \
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(__extension__ ((union { unsigned char __c[8]; \
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double __d; }) \
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{ __nan_bytes }).__d)
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#else /* Not GCC. */
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static CONST char __nan[8] = __nan_bytes;
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#define NAN (*(CONST double *) __nan)
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#endif /* GCC. */
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#endif /* nan.h */
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