misc/qefgcvt.c

   1 /* Compatibility functions for floating point formatting, long double version.
   2    Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <float.h>
  21
  22 #define FLOAT_TYPE long double
  23 #define FUNC_PREFIX q
  24 #define FLOAT_FMT_FLAG "L"
  25 /* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but
  26    we don't have log10 available in the preprocessor.  Since we cannot
  27    assume anything on the used `long double' format be generous.  */
  28 #define MAXDIG (NDIGIT_MAX + 12)
  29 #define FCVT_MAXDIG (LDBL_MAX_10_EXP + MAXDIG)
  30 #if LDBL_MANT_DIG == 64
  31 # define NDIGIT_MAX 21
  32 #elif LDBL_MANT_DIG == 53
  33 # define NDIGIT_MAX 17
  34 #elif LDBL_MANT_DIG == 113
  35 # define NDIGIT_MAX 36
  36 #elif LDBL_MANT_DIG == 56
  37 # define NDIGIT_MAX 18
  38 #else
  39 /* See IEEE 854 5.6, table 2 for this formula.  Unfortunately we need a
  40    compile time constant here, so we cannot use it.  */
  41 # error "NDIGIT_MAX must be precomputed"
  42 # define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0)))
  43 #endif
  44
  45 #include "efgcvt.c"