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/*************************************************************************
 *
 * $Id: trionan.h,v 1.9 2005/03/27 18:52:45 breese Exp $
 *
 * Copyright (C) 2001 Bjorn Reese <breese@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
 * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
 *
 ************************************************************************/

#ifndef TRIO_TRIONAN_H
#define TRIO_TRIONAN_H

#include "triodef.h"

#ifdef __cplusplus
extern "C" {
#endif

#if !defined(TRIO_PUBLIC_NAN)
# if !defined(TRIO_PUBLIC)
#  define TRIO_PUBLIC
# endif
# define TRIO_PUBLIC_NAN TRIO_PUBLIC
#endif
  
enum {
  TRIO_FP_INFINITE,
  TRIO_FP_NAN,
  TRIO_FP_NORMAL,
  TRIO_FP_SUBNORMAL,
  TRIO_FP_ZERO
};

/*************************************************************************
 * Dependencies
 */

#if defined(TRIO_EMBED_NAN)

/*
 * The application that trionan is embedded in must define which functions
 * it uses.
 *
 * The following resolves internal dependencies.
 */
  
# if defined(TRIO_FUNC_ISNAN) \
  || defined(TRIO_FUNC_ISINF)
#  if !defined(TRIO_FUNC_FPCLASSIFY_AND_SIGNBIT)
#   define TRIO_FUNC_FPCLASSIFY_AND_SIGNBIT
#  endif
# endif

# if defined(TRIO_FUNC_NAN)
#  if !defined(TRIO_FUNC_PINF)
#   define TRIO_FUNC_PINF
#  endif
# endif
  
# if defined(TRIO_FUNC_NINF)
#  if !defined(TRIO_FUNC_PINF)
#   define TRIO_FUNC_PINF
#  endif
# endif

#else

/*
 * When trionan is not embedded all all functions are defined.
 */
  
# define TRIO_FUNC_NAN
# define TRIO_FUNC_PINF
# define TRIO_FUNC_NINF
# define TRIO_FUNC_NZERO
# define TRIO_FUNC_ISNAN
# define TRIO_FUNC_ISINF
# define TRIO_FUNC_ISFINITE
# define TRIO_FUNC_SIGNBIT
# define TRIO_FUNC_FPCLASSIFY
# define TRIO_FUNC_FPCLASSIFY_AND_SIGNBIT
  
#endif

/*************************************************************************
 * Functions
 */

/*
 * Return NaN (Not-a-Number).
 */
#if defined(TRIO_FUNC_NAN)
TRIO_PUBLIC_NAN double
trio_nan
TRIO_PROTO((void));
#endif

/*
 * Return positive infinity.
 */
#if defined(TRIO_FUNC_PINF)
TRIO_PUBLIC_NAN double
trio_pinf
TRIO_PROTO((void));
#endif

/*
 * Return negative infinity.
 */
#if defined(TRIO_FUNC_NINF)
TRIO_PUBLIC_NAN double
trio_ninf
TRIO_PROTO((void));
#endif

/*
 * Return negative zero.
 */
#if defined(TRIO_FUNC_NZERO)
TRIO_PUBLIC_NAN double
trio_nzero
TRIO_PROTO((TRIO_NOARGS));
#endif

/*
 * If number is a NaN return non-zero, otherwise return zero.
 */
#if defined(TRIO_FUNC_ISNAN)
TRIO_PUBLIC_NAN int
trio_isnan
TRIO_PROTO((double number));
#endif

/*
 * If number is positive infinity return 1, if number is negative
 * infinity return -1, otherwise return 0.
 */
#if defined(TRIO_FUNC_ISINF)
TRIO_PUBLIC_NAN int
trio_isinf
TRIO_PROTO((double number));
#endif

/*
 * If number is finite return non-zero, otherwise return zero.
 */
#if defined(TRIO_FUNC_ISFINITE)
TRIO_PUBLIC_NAN int
trio_isfinite
TRIO_PROTO((double number));
#endif

#if defined(TRIO_FUNC_SIGNBIT)
TRIO_PUBLIC_NAN int
trio_signbit
TRIO_PROTO((double number));
#endif

#if defined(TRIO_FUNC_FPCLASSIFY)
TRIO_PUBLIC_NAN int
trio_fpclassify
TRIO_PROTO((double number));
#endif

#if defined(TRIO_FUNC_FPCLASSIFY_AND_SIGNBIT)
TRIO_PUBLIC_NAN int
trio_fpclassify_and_signbit
TRIO_PROTO((double number, int *is_negative));
#endif

#ifdef __cplusplus
}
#endif

#endif /* TRIO_TRIONAN_H */