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Leaked source code of windows server 2003
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windows-server-2003/base/crts/crtw32/stdcpp/xdtest.c

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4 years ago
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  1. /* _Dtest function -- IEEE 754 version */
  2. #include "xmath.h"
  3. _STD_BEGIN
  5. _CRTIMP2 short __cdecl _Dtest(double *px)
  6. { /* categorize *px */
  7. unsigned short *ps = (unsigned short *)px;
  9. if ((ps[_D0] & _DMASK) == _DMAX << _DOFF)
  10. return ((ps[_D0] & _DFRAC) != 0 || ps[_D1] != 0
  11. || ps[_D2] != 0 || ps[_D3] != 0 ? _NANCODE : _INFCODE);
  12. else if ((ps[_D0] & ~_DSIGN) != 0 || ps[_D1] != 0
  13. || ps[_D2] != 0 || ps[_D3] != 0)
  14. return (_FINITE);
  15. else
  16. return (0);
  17. }
  18. _STD_END
  20. /*
  21. * Copyright (c) 1992-2001 by P.J. Plauger. ALL RIGHTS RESERVED.
  22. * Consult your license regarding permissions and restrictions.
  23. V3.10:0009 */