sysdeps/ieee754/ldbl-128/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to
   2    ISO C99.
   3    Copyright (C) 1997, 1998, 1999, 2000, 2005 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #define PRINT_FPHEX_LONG_DOUBLE \
  22 do {                                                                          \
  23       /* We have 112 bits of mantissa plus one implicit digit.  Since         \
  24          112 bits are representable without rest using hexadecimal            \
  25          digits we use only the implicit digits for the number before         \
  26          the decimal point.  */                                               \
  27       unsigned long long int num0, num1;                                      \
  28                                                                               \
  29       assert (sizeof (long double) == 16);                                    \
  30                                                                               \
  31       num0 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32      \
  32              | fpnum.ldbl.ieee.mantissa1);                                    \
  33       num1 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa2) << 32      \
  34              | fpnum.ldbl.ieee.mantissa3);                                    \
  35                                                                               \
  36       zero_mantissa = (num0|num1) == 0;                                       \
  37                                                                               \
  38       if (sizeof (unsigned long int) > 6)                                     \
  39         {                                                                     \
  40           numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16,              \
  41                                info->spec == 'A');                            \
  42           wnumstr = _itowa_word (num1,                                        \
  43                                  wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
  44                                  16, info->spec == 'A');                      \
  45         }                                                                     \
  46       else                                                                    \
  47         {                                                                     \
  48           numstr = _itoa (num1, numbuf + sizeof numbuf, 16,                   \
  49                           info->spec == 'A');                                 \
  50           wnumstr = _itowa (num1,                                             \
  51                             wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),    \
  52                             16, info->spec == 'A');                           \
  53         }                                                                     \
  54                                                                               \
  55       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  56         {                                                                     \
  57           *--numstr = '0';                                                    \
  58           *--wnumstr = L'0';                                                  \
  59         }                                                                     \
  60                                                                               \
  61       if (sizeof (unsigned long int) > 6)                                     \
  62         {                                                                     \
  63           numstr = _itoa_word (num0, numstr, 16, info->spec == 'A');          \
  64           wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A');       \
  65         }                                                                     \
  66       else                                                                    \
  67         {                                                                     \
  68           numstr = _itoa (num0, numstr, 16, info->spec == 'A');               \
  69           wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A');            \
  70         }                                                                     \
  71                                                                               \
  72       /* Fill with zeroes.  */                                                \
  73       while (numstr > numbuf + (sizeof numbuf - 112 / 4))                     \
  74         {                                                                     \
  75           *--numstr = '0';                                                    \
  76           *--wnumstr = L'0';                                                  \
  77         }                                                                     \
  78                                                                               \
  79       leading = fpnum.ldbl.ieee.exponent == 0 ? '0' : '1';                    \
  80                                                                               \
  81       exponent = fpnum.ldbl.ieee.exponent;                                    \
  82                                                                               \
  83       if (exponent == 0)                                                      \
  84         {                                                                     \
  85           if (zero_mantissa)                                                  \
  86             expnegative = 0;                                                  \
  87           else                                                                \
  88             {                                                                 \
  89               /* This is a denormalized number.  */                           \
  90               expnegative = 1;                                                \
  91               exponent = IEEE854_LONG_DOUBLE_BIAS - 1;                        \
  92             }                                                                 \
  93         }                                                                     \
  94       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS)                          \
  95         {                                                                     \
  96           expnegative = 0;                                                    \
  97           exponent -= IEEE854_LONG_DOUBLE_BIAS;                               \
  98         }                                                                     \
  99       else                                                                    \
 100         {                                                                     \
 101           expnegative = 1;                                                    \
 102           exponent = -(exponent - IEEE854_LONG_DOUBLE_BIAS);                  \
 103         }                                                                     \
 104 } while (0)
 105
 106 #include <stdio-common/printf_fphex.c>