29 lines
650 B
C
29 lines
650 B
C
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/* _Dtest function -- IEEE 754 version */
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#include "wctype.h"
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#include "xmath.h"
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_STD_BEGIN
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_CRTIMP2 short _Dtest(double *px)
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{ /* categorize *px */
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unsigned short *ps = (unsigned short *)px;
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if ((ps[_D0] & _DMASK) == _DMAX << _DOFF)
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return ((ps[_D0] & _DFRAC) != 0 || ps[_D1] != 0
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|| ps[_D2] != 0 || ps[_D3] != 0 ? NAN : INF);
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else if ((ps[_D0] & ~_DSIGN) != 0 || ps[_D1] != 0
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|| ps[_D2] != 0 || ps[_D3] != 0)
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return (FINITE);
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else
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return (0);
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}
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_STD_END
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/*
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* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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*/
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/*
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941029 pjp: added _STD machinery
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*/
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