sysdeps/ieee754/ldbl-128/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to
   2    ISO C99.
   3    Copyright (C) 1997-2015 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 #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       union ieee854_long_double u;                                            \
  28       u.d = fpnum.ldbl;                                                       \
  29                                                                               \
  30       assert (sizeof (long double) == 16);                                    \
  31                                                                               \
  32       num0 = (((unsigned long long int) u.ieee.mantissa0) << 32               \
  33              | u.ieee.mantissa1);                                             \
  34       num1 = (((unsigned long long int) u.ieee.mantissa2) << 32               \
  35              | u.ieee.mantissa3);                                             \
  36                                                                               \
  37       zero_mantissa = (num0|num1) == 0;                                       \
  38                                                                               \
  39       if (sizeof (unsigned long int) > 6)                                     \
  40         {                                                                     \
  41           numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16,              \
  42                                info->spec == 'A');                            \
  43           wnumstr = _itowa_word (num1,                                        \
  44                                  wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
  45                                  16, info->spec == 'A');                      \
  46         }                                                                     \
  47       else                                                                    \
  48         {                                                                     \
  49           numstr = _itoa (num1, numbuf + sizeof numbuf, 16,                   \
  50                           info->spec == 'A');                                 \
  51           wnumstr = _itowa (num1,                                             \
  52                             wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),    \
  53                             16, info->spec == 'A');                           \
  54         }                                                                     \
  55                                                                               \
  56       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  57         {                                                                     \
  58           *--numstr = '0';                                                    \
  59           *--wnumstr = L'0';                                                  \
  60         }                                                                     \
  61                                                                               \
  62       if (sizeof (unsigned long int) > 6)                                     \
  63         {                                                                     \
  64           numstr = _itoa_word (num0, numstr, 16, info->spec == 'A');          \
  65           wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A');       \
  66         }                                                                     \
  67       else                                                                    \
  68         {                                                                     \
  69           numstr = _itoa (num0, numstr, 16, info->spec == 'A');               \
  70           wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A');            \
  71         }                                                                     \
  72                                                                               \
  73       /* Fill with zeroes.  */                                                \
  74       while (numstr > numbuf + (sizeof numbuf - 112 / 4))                     \
  75         {                                                                     \
  76           *--numstr = '0';                                                    \
  77           *--wnumstr = L'0';                                                  \
  78         }                                                                     \
  79                                                                               \
  80       leading = u.ieee.exponent == 0 ? '0' : '1';                             \
  81                                                                               \
  82       exponent = u.ieee.exponent;                                             \
  83                                                                               \
  84       if (exponent == 0)                                                      \
  85         {                                                                     \
  86           if (zero_mantissa)                                                  \
  87             expnegative = 0;                                                  \
  88           else                                                                \
  89             {                                                                 \
  90               /* This is a denormalized number.  */                           \
  91               expnegative = 1;                                                \
  92               exponent = IEEE854_LONG_DOUBLE_BIAS - 1;                        \
  93             }                                                                 \
  94         }                                                                     \
  95       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS)                          \
  96         {                                                                     \
  97           expnegative = 0;                                                    \
  98           exponent -= IEEE854_LONG_DOUBLE_BIAS;                               \
  99         }                                                                     \
 100       else                                                                    \
 101         {                                                                     \
 102           expnegative = 1;                                                    \
 103           exponent = -(exponent - IEEE854_LONG_DOUBLE_BIAS);                  \
 104         }                                                                     \
 105 } while (0)
 106
 107 #include <stdio-common/printf_fphex.c>