/* $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
