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glibc/misc/qefgcvt.c
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/* Compatibility functions for floating point formatting, long double version. | |
Copyright (C) 1996-2016 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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <float.h> | |
#define FLOAT_TYPE long double | |
#define FUNC_PREFIX q | |
#define FLOAT_FMT_FLAG "L" | |
/* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but | |
we don't have log10 available in the preprocessor. Since we cannot | |
assume anything on the used `long double' format be generous. */ | |
#define MAXDIG (NDIGIT_MAX + 12) | |
#define FCVT_MAXDIG (LDBL_MAX_10_EXP + MAXDIG) | |
#if LDBL_MANT_DIG == 64 | |
# define NDIGIT_MAX 21 | |
#elif LDBL_MANT_DIG == 53 | |
# define NDIGIT_MAX 17 | |
#elif LDBL_MANT_DIG == 113 | |
# define NDIGIT_MAX 36 | |
#elif LDBL_MANT_DIG == 106 | |
# define NDIGIT_MAX 34 | |
#elif LDBL_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 * LDBL_MANT_DIG + 1.0))) | |
#endif | |
#include "efgcvt.c" |