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[glibc/history.git] / stdlib / fpioconst.h
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1 /* Header file for constants used in floating point <-> decimal conversions.
2 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #ifndef _FPIOCONST_H
22 #define _FPIOCONST_H
24 #include <float.h>
25 #include <math.h>
26 #include <gmp.h>
29 /* These values are used by __printf_fp, where they are noncritical (if the
30 value is not large enough, it will just be slower); and by
31 strtof/strtod/strtold, where it is critical (it's used for overflow
32 detection).
34 XXX These should be defined in <float.h>. For the time being, we have the
35 IEEE754 values here. */
37 #if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
38 # define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
39 #else
40 # define LDBL_MAX_10_EXP_LOG 8 /* = floor(log_2(LDBL_MAX_10_EXP)) */
41 #endif
42 #define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
43 #define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
46 /* The array with the number representation. */
47 extern const mp_limb_t __tens[] attribute_hidden;
49 /* Table of powers of ten. This is used by __printf_fp and by
50 strtof/strtod/strtold. */
51 struct mp_power
53 size_t arrayoff; /* Offset in `__tens'. */
54 mp_size_t arraysize; /* Size of the array. */
55 int p_expo; /* Exponent of the number 10^(2^i). */
56 int m_expo; /* Exponent of the number 10^-(2^i-1). */
58 extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1]
59 attribute_hidden;
61 /* The constants in the array `_fpioconst_pow10' have an offset. */
62 #if BITS_PER_MP_LIMB == 32
63 # define _FPIO_CONST_OFFSET 2
64 #else
65 # define _FPIO_CONST_OFFSET 1
66 #endif
69 #endif /* fpioconst.h */