misc/qefgcvt_r.c

   1 /* Compatibility functions for floating point formatting, reentrant,
   2    long double versions.
   3    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   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.
  10
  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.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <float.h>
  21
  22 #define FLOAT_TYPE long double
  23 #define FUNC_PREFIX q
  24 #define FLOAT_FMT_FLAG "L"
  25 #define FLOAT_NAME_EXT l
  26 #define FLOAT_MIN_10_EXP LDBL_MIN_10_EXP
  27 #if LDBL_MANT_DIG == 64
  28 # define NDIGIT_MAX 21
  29 #elif LDBL_MANT_DIG == 53
  30 # define NDIGIT_MAX 17
  31 #elif LDBL_MANT_DIG == 113
  32 # define NDIGIT_MAX 36
  33 #elif LDBL_MANT_DIG == 106
  34 # define NDIGIT_MAX 34
  35 #elif LDBL_MANT_DIG == 56
  36 # define NDIGIT_MAX 18
  37 #else
  38 /* See IEEE 854 5.6, table 2 for this formula.  Unfortunately we need a
  39    compile time constant here, so we cannot use it.  */
  40 # error "NDIGIT_MAX must be precomputed"
  41 # define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0)))
  42 #endif
  43 #if LDBL_MIN_10_EXP == -37
  44 # define FLOAT_MIN_10_NORM      1.0e-37L
  45 #elif LDBL_MIN_10_EXP == -291
  46 # define FLOAT_MIN_10_NORM      1.0e-291L
  47 #elif LDBL_MIN_10_EXP == -307
  48 # define FLOAT_MIN_10_NORM      1.0e-307L
  49 #elif LDBL_MIN_10_EXP == -4931
  50 # define FLOAT_MIN_10_NORM      1.0e-4931L
  51 #else
  52 /* libc can't depend on libm.  */
  53 # error "FLOAT_MIN_10_NORM must be precomputed"
  54 # define FLOAT_MIN_10_NORM      exp10l (LDBL_MIN_10_EXP)
  55 #endif
  56
  57 #include "efgcvt_r.c"