Source code of Windows XP (NT5)
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/* _Dtest function -- IEEE 754 version */#include "xmath.h"
_STD_BEGIN
_CRTIMP2 short __cdecl _Dtest(double *px) { /* categorize *px */ unsigned short *ps = (unsigned short *)px;
if ((ps[_D0] & _DMASK) == _DMAX << _DOFF) return ((ps[_D0] & _DFRAC) != 0 || ps[_D1] != 0 || ps[_D2] != 0 || ps[_D3] != 0 ? _NANCODE : _INFCODE); else if ((ps[_D0] & ~_DSIGN) != 0 || ps[_D1] != 0 || ps[_D2] != 0 || ps[_D3] != 0) return (_FINITE); else return (0); }_STD_END
/*
* Copyright (c) 1992-2001 by P.J. Plauger. ALL RIGHTS RESERVED. * Consult your license regarding permissions and restrictions. V3.10:0009 */
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