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/* Macros for the implementation of *cvt functions, double version.
Copyright (C) 1995-2024 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, see
<https://www.gnu.org/licenses/>. */
#include <float.h>
#define FLOAT_TYPE double
#define FUNC_PREFIX
#define FLOAT_FMT_FLAG
#define FLOAT_NAME_EXT
#define FLOAT_MIN_10_EXP DBL_MIN_10_EXP
/* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we
don't have log10 available in the preprocessor. */
#define MAXDIG (NDIGIT_MAX + 3)
#define FCVT_MAXDIG (DBL_MAX_10_EXP + MAXDIG)
#if DBL_MANT_DIG == 53
# define NDIGIT_MAX 17
#elif DBL_MANT_DIG == 24
# define NDIGIT_MAX 9
#elif DBL_MANT_DIG == 56
# define NDIGIT_MAX 18
#else
/* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a
compile time constant here, so we cannot use it. */
# error "NDIGIT_MAX must be precomputed"
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
#endif
#if DBL_MIN_10_EXP == -37
# define FLOAT_MIN_10_NORM 1.0e-37
#elif DBL_MIN_10_EXP == -307
# define FLOAT_MIN_10_NORM 1.0e-307
#elif DBL_MIN_10_EXP == -4931
# define FLOAT_MIN_10_NORM 1.0e-4931
#else
/* libc can't depend on libm. */
# error "FLOAT_MIN_10_NORM must be precomputed"
# define FLOAT_MIN_10_NORM exp10 (DBL_MIN_10_EXP)
#endif
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