sysdeps/ieee754/ldbl-128/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to
   2    ISO C99.
   3    Copyright (C) 1997-2013 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 #define PRINT_FPHEX_LONG_DOUBLE \
  21 do {                                                                          \
  22       /* We have 112 bits of mantissa plus one implicit digit.  Since         \
  23          112 bits are representable without rest using hexadecimal            \
  24          digits we use only the implicit digits for the number before         \
  25          the decimal point.  */                                               \
  26       unsigned long long int num0, num1;                                      \
  27                                                                               \
  28       assert (sizeof (long double) == 16);                                    \
  29                                                                               \
  30       num0 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32      \
  31              | fpnum.ldbl.ieee.mantissa1);                                    \
  32       num1 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa2) << 32      \
  33              | fpnum.ldbl.ieee.mantissa3);                                    \
  34                                                                               \
  35       zero_mantissa = (num0|num1) == 0;                                       \
  36                                                                               \
  37       if (sizeof (unsigned long int) > 6)                                     \
  38         {                                                                     \
  39           numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16,              \
  40                                info->spec == 'A');                            \
  41           wnumstr = _itowa_word (num1,                                        \
  42                                  wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
  43                                  16, info->spec == 'A');                      \
  44         }                                                                     \
  45       else                                                                    \
  46         {                                                                     \
  47           numstr = _itoa (num1, numbuf + sizeof numbuf, 16,                   \
  48                           info->spec == 'A');                                 \
  49           wnumstr = _itowa (num1,                                             \
  50                             wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),    \
  51                             16, info->spec == 'A');                           \
  52         }                                                                     \
  53                                                                               \
  54       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  55         {                                                                     \
  56           *--numstr = '0';                                                    \
  57           *--wnumstr = L'0';                                                  \
  58         }                                                                     \
  59                                                                               \
  60       if (sizeof (unsigned long int) > 6)                                     \
  61         {                                                                     \
  62           numstr = _itoa_word (num0, numstr, 16, info->spec == 'A');          \
  63           wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A');       \
  64         }                                                                     \
  65       else                                                                    \
  66         {                                                                     \
  67           numstr = _itoa (num0, numstr, 16, info->spec == 'A');               \
  68           wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A');            \
  69         }                                                                     \
  70                                                                               \
  71       /* Fill with zeroes.  */                                                \
  72       while (numstr > numbuf + (sizeof numbuf - 112 / 4))                     \
  73         {                                                                     \
  74           *--numstr = '0';                                                    \
  75           *--wnumstr = L'0';                                                  \
  76         }                                                                     \
  77                                                                               \
  78       leading = fpnum.ldbl.ieee.exponent == 0 ? '0' : '1';                    \
  79                                                                               \
  80       exponent = fpnum.ldbl.ieee.exponent;                                    \
  81                                                                               \
  82       if (exponent == 0)                                                      \
  83         {                                                                     \
  84           if (zero_mantissa)                                                  \
  85             expnegative = 0;                                                  \
  86           else                                                                \
  87             {                                                                 \
  88               /* This is a denormalized number.  */                           \
  89               expnegative = 1;                                                \
  90               exponent = IEEE854_LONG_DOUBLE_BIAS - 1;                        \
  91             }                                                                 \
  92         }                                                                     \
  93       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS)                          \
  94         {                                                                     \
  95           expnegative = 0;                                                    \
  96           exponent -= IEEE854_LONG_DOUBLE_BIAS;                               \
  97         }                                                                     \
  98       else                                                                    \
  99         {                                                                     \
 100           expnegative = 1;                                                    \
 101           exponent = -(exponent - IEEE854_LONG_DOUBLE_BIAS);                  \
 102         }                                                                     \
 103 } while (0)
 104
 105 #include <stdio-common/printf_fphex.c>