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23 lines
803 B
C
23 lines
803 B
C
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/*********************************************************************
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* Copyright 2008, University Corporation for Atmospheric Research
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* See netcdf/README file for copying and redistribution conditions.
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* $Id: isnan.h,v 1.3 2008/04/23 22:05:00 russ Exp $
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*********************************************************************/
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#include <config.h>
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#ifndef NO_FLOAT_H
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#include <float.h> /* for DBL_MAX */
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#endif /* NO_FLOAT_H */
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#include <math.h>
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#if ! (defined(isinf) || HAVE_DECL_ISINF)
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#define isinf(x) (DBL_MAX/((double)(x))==0.0)
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#endif /* !HAVE_DECL_ISINF */
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#if ! (defined(isnan) || HAVE_DECL_ISNAN)
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#define isnan(x) ((x)!=(x))
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#endif /* !HAVE_DECL_ISNAN */
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#if ! (defined(isfinite) || HAVE_DECL_ISFINITE)
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#define isfinite(x) (!(isinf(x)||isnan(x)))
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#endif /* !HAVE_DECL_ISFINITE */
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