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/*
* Copyright (c) 1999-2003 Smithsonian Astrophysical Observatory
*/
/*
*
* NaN.h -- include file to deal with IEEE NaN values
*
* Idea taken from fitsio2.h in the cfitsio package by William Pence (HEASARC),
* to whom grateful acknowledgement is made.
*
* These functions tests whether the float value is a reserved IEEE
* value such as a Not-a-Number (NaN), or underflow, overflow, or
* infinity. The functions returns 1 if the value is a NaN, overflow
* or infinity; otherwise it returns 0.
*
* isnanf tests floats, isnand tests doubles.
*
*/
#ifndef __nan_h
#define __nan_h
#include "prsetup.h"
#define _BIG_ENDIAN @BIGENDIAN@
#if _BIG_ENDIAN
#define FNANOFF 0
#define DNANOFF 0
#else
#define FNANOFF 1
#define DNANOFF 3
#endif
#define FNANMASK 0x7F80 /* mask bits 1 - 8; all set on NaNs */
/* all 0 on underflow or 0. */
#define DNANMASK 0x7FF0 /* mask bits 1 - 11; all set on NaNs */
/* all 0 on underflow or 0. */
#ifndef isnanf
typedef union {
float f;
short x[2];
} uffu;
#define isnanf(X) ((((uffu*)&X)->x[FNANOFF] & FNANMASK) == FNANMASK)
#endif
#ifndef isnand
typedef union {
double d;
short x[4];
} uddu;
#define isnand(X) ((((uddu*)&X)->x[DNANOFF] & DNANMASK) == DNANMASK)
#endif
_PRbeg
float getnanf _PRx((void));
double getnand _PRx((void));
_PRend
#endif
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