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/* $Id: isinf.c,v 1.15 2000/04/12 17:15:28 momjian Exp $ */
#include <math.h>
#include "config.h"
#if HAVE_FPCLASS /* this is _not_ HAVE_FP_CLASS, and not
* typo */
#if HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
int
isinf(double d)
{
fpclass_t type = fpclass(d);
switch (type)
{
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;
}
#elif 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
#endif
#ifdef __QNX__
#include <float.h>
int
isinf(double x)
{
if (x == HUGE_VAL)
return 1;
if (x == -HUGE_VAL)
return -1;
return 0;
}
#endif
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