1/* Header file for constants used in floating point <-> decimal conversions.
2   Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
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.
9
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
13   Lesser General Public License for more details.
14
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.  */
19
20#ifndef _FPIOCONST_H
21#define	_FPIOCONST_H
22
23#include <float.h>
24#include <math.h>
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
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
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
45/* The array with the number representation. */
46extern const mp_limb_t __tens[];
47
48/* Table of powers of ten.  This is used by __printf_fp and by
49   strtof/strtod/strtold.  */
50struct mp_power
51  {
52    size_t arrayoff;		/* Offset in `__tens'.  */
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  };
57extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1];
58
59/* The constants in the array `_fpioconst_pow10' have an offset.  */
60#if BITS_PER_MP_LIMB == 32
61# define _FPIO_CONST_OFFSET	2
62#else
63# define _FPIO_CONST_OFFSET	1
64#endif
65
66
67#endif	/* fpioconst.h */
68