[thirdparty/glibc.git] / stdlib / fpioconst.h

/* Header file for constants used in floating point <-> decimal conversions.
   Copyright (C) 1995,1996,1997,1998,1999,2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _FPIOCONST_H
#define	_FPIOCONST_H

#include <float.h>
#include <math.h>
#include "gmp.h"


/* These values are used by __printf_fp, where they are noncritical (if the
   value is not large enough, it will just be slower); and by
   strtof/strtod/strtold, where it is critical (it's used for overflow
   detection).

   XXX These should be defined in <float.h>.  For the time being, we have the
   IEEE754 values here.  */

#ifndef __NO_LONG_DOUBLE_MATH
# define LDBL_MAX_10_EXP_LOG	12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
#else
# define LDBL_MAX_10_EXP_LOG	8 /* = floor(log_2(LDBL_MAX_10_EXP)) */
#endif
#define DBL_MAX_10_EXP_LOG	8 /* = floor(log_2(DBL_MAX_10_EXP)) */
#define FLT_MAX_10_EXP_LOG	5 /* = floor(log_2(FLT_MAX_10_EXP)) */


/* The array with the number representation. */
extern const mp_limb_t __tens[] attribute_hidden;

/* Table of powers of ten.  This is used by __printf_fp and by
   strtof/strtod/strtold.  */
struct mp_power
  {
    size_t arrayoff;		/* Offset in `__tens'.  */
    mp_size_t arraysize;	/* Size of the array.  */
    int p_expo;			/* Exponent of the number 10^(2^i).  */
    int m_expo;			/* Exponent of the number 10^-(2^i-1).  */
  };
extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1]
     attribute_hidden;

/* The constants in the array `_fpioconst_pow10' have an offset.  */
#if BITS_PER_MP_LIMB == 32
# define _FPIO_CONST_OFFSET	2
#else
# define _FPIO_CONST_OFFSET	1
#endif


#endif	/* fpioconst.h */
Commit	Line	Data
28f540f4	1	/* Header file for constants used in floating point <-> decimal conversions.
418f1701	2	Copyright (C) 1995,1996,1997,1998,1999,2002 Free Software Foundation, Inc.
7cc27f44	3	This file is part of the GNU C Library.
28f540f4	4
7cc27f44	5	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
28f540f4	9
7cc27f44 UD	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	13	Lesser General Public License for more details.
28f540f4	14
41bdb6e2 AJ	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, write to the Free
	17	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	18	02111-1307 USA. */
28f540f4 RM	19
	20	#ifndef _FPIOCONST_H
	21	#define _FPIOCONST_H
	22
	23	#include <float.h>
76235ed4	24	#include <math.h>
28f540f4 RM	25	#include "gmp.h"
	26
	27
	28	/* These values are used by __printf_fp, where they are noncritical (if the
	29	value is not large enough, it will just be slower); and by
	30	strtof/strtod/strtold, where it is critical (it's used for overflow
	31	detection).
	32
	33	XXX These should be defined in <float.h>. For the time being, we have the
	34	IEEE754 values here. */
	35
390955cb UD	36	#ifndef __NO_LONG_DOUBLE_MATH
	37	# define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
	38	#else
	39	# define LDBL_MAX_10_EXP_LOG 8 /* = floor(log_2(LDBL_MAX_10_EXP)) */
	40	#endif
28f540f4 RM	41	#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
	42	#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
	43
	44
c4563d2d	45	/* The array with the number representation. */
418f1701	46	extern const mp_limb_t __tens[] attribute_hidden;
c4563d2d	47
28f540f4 RM	48	/* Table of powers of ten. This is used by __printf_fp and by
	49	strtof/strtod/strtold. */
	50	struct mp_power
	51	{
c4563d2d	52	size_t arrayoff; /* Offset in `__tens'. */
28f540f4 RM	53	mp_size_t arraysize; /* Size of the array. */
	54	int p_expo; /* Exponent of the number 10^(2^i). */
	55	int m_expo; /* Exponent of the number 10^-(2^i-1). */
	56	};
418f1701 UD	57	extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1]
418f1701 UD	58	attribute_hidden;
28f540f4	59
bfc04a9f RM	60	/* The constants in the array `_fpioconst_pow10' have an offset. */
	61	#if BITS_PER_MP_LIMB == 32
	62	# define _FPIO_CONST_OFFSET 2
	63	#else
	64	# define _FPIO_CONST_OFFSET 1
	65	#endif
	66
28f540f4 RM	67
28f540f4 RM	68	#endif /* fpioconst.h */