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53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/* Header file for constants used in floating point <-> decimal conversions.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _FPIOCONST_H
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#define _FPIOCONST_H
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#include <float.h>
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#include "gmp.h"
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/* These values are used by __printf_fp, where they are noncritical (if the
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value is not large enough, it will just be slower); and by
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strtof/strtod/strtold, where it is critical (it's used for overflow
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detection).
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XXX These should be defined in <float.h>. For the time being, we have the
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IEEE754 values here. */
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#define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
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#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
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#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
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/* Table of powers of ten. This is used by __printf_fp and by
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strtof/strtod/strtold. */
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struct mp_power
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{
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const mp_limb *array; /* The array with the number representation. */
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mp_size_t arraysize; /* Size of the array. */
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int p_expo; /* Exponent of the number 10^(2^i). */
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int m_expo; /* Exponent of the number 10^-(2^i-1). */
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};
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extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1];
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#endif /* fpioconst.h */
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