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- /* Compatibility functions for floating point formatting, long double version.
- Copyright (C) 1996-2019 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"
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