/* ieee-utils/gsl_ieee_utils.h

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or (at

 * your option) any later version.

 * 

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 */

#ifndef __GSL_IEEE_UTILS_H__

#define __GSL_IEEE_UTILS_H__

#include <stdio.h>

#undef __BEGIN_DECLS

#undef __END_DECLS

#ifdef __cplusplus

# define __BEGIN_DECLS extern "C" {

# define __END_DECLS }

#else

# define __BEGIN_DECLS /* empty */

# define __END_DECLS /* empty */

#endif

__BEGIN_DECLS

enum {

  GSL_IEEE_TYPE_NAN = 1,

  GSL_IEEE_TYPE_INF = 2,

  GSL_IEEE_TYPE_NORMAL = 3,

  GSL_IEEE_TYPE_DENORMAL = 4,

  GSL_IEEE_TYPE_ZERO = 5

} ;

typedef struct  {

  int sign ;

  char mantissa[24] ; /* Actual bits are 0..22, element 23 is \0 */

  int exponent ;

  int type ;

} gsl_ieee_float_rep ;

typedef struct  {

  int sign ;

  char mantissa[53] ; /* Actual bits are 0..51, element 52 is \0 */

  int exponent ;

  int type ;

} gsl_ieee_double_rep ;

void gsl_ieee_printf_float (const float * x) ;

void gsl_ieee_printf_double (const double * x) ;

void gsl_ieee_fprintf_float (FILE * stream, const float * x) ;

void gsl_ieee_fprintf_double (FILE * stream, const double * x) ;

void gsl_ieee_float_to_rep (const float * x, gsl_ieee_float_rep * r) ;

void gsl_ieee_double_to_rep (const double * x, gsl_ieee_double_rep * r) ;

enum {

  GSL_IEEE_SINGLE_PRECISION = 1,

  GSL_IEEE_DOUBLE_PRECISION = 2,

  GSL_IEEE_EXTENDED_PRECISION = 3

} ;

enum {

  GSL_IEEE_ROUND_TO_NEAREST = 1,

  GSL_IEEE_ROUND_DOWN = 2,

  GSL_IEEE_ROUND_UP = 3,

  GSL_IEEE_ROUND_TO_ZERO = 4

} ;

enum {

  GSL_IEEE_MASK_INVALID = 1,

  GSL_IEEE_MASK_DENORMALIZED = 2,

  GSL_IEEE_MASK_DIVISION_BY_ZERO = 4,

  GSL_IEEE_MASK_OVERFLOW = 8,

  GSL_IEEE_MASK_UNDERFLOW = 16,

  GSL_IEEE_MASK_ALL = 31,

  GSL_IEEE_TRAP_INEXACT = 32

} ;

void gsl_ieee_env_setup (void) ;

int gsl_ieee_read_mode_string (const char * description, int * precision,

                               int * rounding, int * exception_mask) ;

int gsl_ieee_set_mode (int precision, int rounding, int exception_mask) ;

__END_DECLS

#endif /* __GSL_IEEE_UTILS_H__ */