/* Replacement 'trionan.c', using Gnulib functions.  */

#include "config.h"
#include <math.h>

/* Copied from gnulib/tests/infinity.h.  */

/* Infinityd () returns a 'double' +Infinity.  */

/* The Microsoft MSVC 9 compiler chokes on the expression 1.0 / 0.0.  */
#if defined _MSC_VER
static double
Infinityd ()
{
  static double zero = 0.0;
  return 1.0 / zero;
}
#else
# define Infinityd() (1.0 / 0.0)
#endif

/* Copied from gnulib/tests/nan.h.  */

/* NaNd () returns a 'double' not-a-number.  */

/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
   on the expression 0.0 / 0.0.  */
#if defined __DECC || defined _MSC_VER
static double
NaNd ()
{
  static double zero = 0.0;
  return zero / zero;
}
#else
# define NaNd() (0.0 / 0.0)
#endif

/* Copied from gnulib/tests/minus-zero.h.  */

/* minus_zerod represents the value -0.0.  */

/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
   ICC 10.0 has a bug when optimizing the expression -zero.
   The expression -DBL_MIN * DBL_MIN does not work when cross-compiling
   to PowerPC on Mac OS X 10.5.  */
#if defined __hpux || defined __sgi || defined __ICC
static double
compute_minus_zerod (void)
{
  return -DBL_MIN * DBL_MIN;
}
# define minus_zerod compute_minus_zerod ()
#else
static double minus_zerod = -0.0;
#endif

#undef INFINITY
#undef NAN

#define INFINITY Infinityd()
#define NAN NaNd()

#define trio_pinf() INFINITY
#define trio_ninf() -INFINITY
#define trio_nan() NAN
#define trio_nzero() minus_zerod

#define trio_isnan(x) isnan(x)
#define trio_isinf(x) isinf(x)
#define trio_signbit(x) signbit(x)