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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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xldtest.c
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C/C++ Source or Header
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1998-06-16
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53 lines
/* _LDtest function -- IEEE 754 version */
#include "wctype.h"
#include "xmath.h"
_STD_BEGIN
#if !_DLONG
_CRTIMP2 short _LDtest(long double *px)
{ /* categorize *px */
return (_Dtest((double *)px));
}
#elif _LONG_DOUBLE_HAS_HIDDEN_BIT
_CRTIMP2 short _LDtest(long double *px)
{ /* categorize *px -- SPARC */
unsigned short *ps = (unsigned short *)px;
short xchar = ps[_L0] & _LMASK;
if (xchar == _LMAX)
return (ps[_L1] != 0 || ps[_L2] != 0 || ps[_L3] != 0
|| ps[_L4] != 0 || ps[_L5] != 0 || ps[_L6] != 0
|| ps[_L7] != 0 ? NAN : INF);
else if (0 < xchar || ps[_L1] || ps[_L2] || ps[_L3]
|| ps[_L4] || ps[_L5] || ps[_L6] || ps[_L7])
return (FINITE);
else
return (0);
}
#else /* _DLONG && !_LONG_DOUBLE_HAS_HIDDEN_BIT */
_CRTIMP2 short _LDtest(long double *px)
{ /* categorize *px */
unsigned short *ps = (unsigned short *)px;
short xchar = ps[_L0] & _LMASK;
if (xchar == _LMAX)
return ((ps[_L1] & 0x7fff) != 0 || ps[_L2] != 0
|| ps[_L3] != 0 || ps[_L4] != 0 ? NAN : INF);
else if (0 < xchar || ps[_L1] != 0 || ps[_L2] || ps[_L3]
|| ps[_L4])
return (FINITE);
else
return (0);
}
#endif
_STD_END
/*
* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
* Consult your license regarding permissions and restrictions.
*/
/*
941029 pjp: added _STD machinery
*/