sysdeps/ieee754/ldbl-96/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to ISO C99.
   2    Copyright (C) 1997-2015 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef LONG_DOUBLE_DENORM_BIAS
  20 # define LONG_DOUBLE_DENORM_BIAS (IEEE854_LONG_DOUBLE_BIAS - 1)
  21 #endif
  22
  23 #define PRINT_FPHEX_LONG_DOUBLE \
  24 do {                                                                          \
  25       /* The "strange" 80 bit format on ix86 and m68k has an explicit         \
  26          leading digit in the 64 bit mantissa.  */                            \
  27       unsigned long long int num;                                             \
  28       union ieee854_long_double u;                                            \
  29       u.d = fpnum.ldbl;                                                       \
  30                                                                               \
  31       assert (sizeof (long double) == 12);                                    \
  32                                                                               \
  33       num = (((unsigned long long int) u.ieee.mantissa0) << 32                \
  34              | u.ieee.mantissa1);                                             \
  35                                                                               \
  36       zero_mantissa = num == 0;                                               \
  37                                                                               \
  38       if (sizeof (unsigned long int) > 6)                                     \
  39         {                                                                     \
  40           numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,               \
  41                                info->spec == 'A');                            \
  42           wnumstr = _itowa_word (num,                                         \
  43                                  wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
  44                                  16, info->spec == 'A');                      \
  45         }                                                                     \
  46       else                                                                    \
  47         {                                                                     \
  48           numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
  49           wnumstr = _itowa (num,                                              \
  50                             wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),    \
  51                             16, info->spec == 'A');                           \
  52         }                                                                     \
  53                                                                               \
  54       /* Fill with zeroes.  */                                                \
  55       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  56         {                                                                     \
  57           *--numstr = '0';                                                    \
  58           *--wnumstr = L'0';                                                  \
  59         }                                                                     \
  60                                                                               \
  61       /* We use a full nibble for the leading digit.  */                      \
  62       leading = *numstr++;                                                    \
  63       wnumstr++;                                                              \
  64                                                                               \
  65       /* We have 3 bits from the mantissa in the leading nibble.              \
  66          Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
  67       exponent = u.ieee.exponent;                                             \
  68                                                                               \
  69       if (exponent == 0)                                                      \
  70         {                                                                     \
  71           if (zero_mantissa)                                                  \
  72             expnegative = 0;                                                  \
  73           else                                                                \
  74             {                                                                 \
  75               /* This is a denormalized number.  */                           \
  76               expnegative = 1;                                                \
  77               /* This is a hook for the m68k long double format, where the    \
  78                  exponent bias is the same for normalized and denormalized    \
  79                  numbers.  */                                                 \
  80               exponent = LONG_DOUBLE_DENORM_BIAS + 3;                         \
  81             }                                                                 \
  82         }                                                                     \
  83       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)                      \
  84         {                                                                     \
  85           expnegative = 0;                                                    \
  86           exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;                           \
  87         }                                                                     \
  88       else                                                                    \
  89         {                                                                     \
  90           expnegative = 1;                                                    \
  91           exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));            \
  92         }                                                                     \
  93 } while (0)
  94
  95 #include <stdio-common/printf_fphex.c>