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/* $Id: isinf.c,v 1.3 1998/02/17 02:00:12 scrappy Exp $ */
#include <math.h>
#include "config.h"
#if HAVE_FPCLASS
# if HAVE_IEEEFP_H
# include <ieeefp.h>
# endif
int
isinf(double d)
{
fpclass_t type = fpclass(d);
switch (type)
{
case FP_SNAN:
case FP_QNAN:
case FP_NINF:
case FP_PINF:
return (1);
default:
break;
}
return (0);
}
#else
# if defined(HAVE_FP_CLASS) || defined(HAVE_FP_CLASS_D)
# if HAVE_FP_CLASS_H
# include <fp_class.h>
# endif
int
isinf(x)
double x;
{
# if HAVE_FP_CLASS
int fpclass = fp_class(x);
# else
int fpclass = fp_class_d(x);
# endif
if (fpclass == FP_POS_INF)
return (1);
if (fpclass == FP_NEG_INF)
return (-1);
return (0);
}
# endif
#endif
#if defined(HAVE_CLASS)
int
isinf(double x)
{
int fpclass = class(x);
if (fpclass == FP_PLUS_INF)
return (1);
if (fpclass == FP_MINUS_INF)
return (-1);
return (0);
}
#endif
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