sysdeps/ieee754/ldbl-96/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to ISO C99.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2005 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef LONG_DOUBLE_DENORM_BIAS
  21 # define LONG_DOUBLE_DENORM_BIAS (IEEE854_LONG_DOUBLE_BIAS - 1)
  22 #endif
  23
  24 #define PRINT_FPHEX_LONG_DOUBLE \
  25 do {                                                                          \
  26       /* The "strange" 80 bit format on ix86 and m68k has an explicit         \
  27          leading digit in the 64 bit mantissa.  */                            \
  28       unsigned long long int num;                                             \
  29                                                                               \
  30       assert (sizeof (long double) == 12);                                    \
  31                                                                               \
  32       num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32       \
  33              | fpnum.ldbl.ieee.mantissa1);                                    \
  34                                                                               \
  35       zero_mantissa = num == 0;                                               \
  36                                                                               \
  37       if (sizeof (unsigned long int) > 6)                                     \
  38         {                                                                     \
  39           numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,               \
  40                                info->spec == 'A');                            \
  41           wnumstr = _itowa_word (num,                                         \
  42                                  wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
  43                                  16, info->spec == 'A');                      \
  44         }                                                                     \
  45       else                                                                    \
  46         {                                                                     \
  47           numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
  48           wnumstr = _itowa (num,                                              \
  49                             wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),    \
  50                             16, info->spec == 'A');                           \
  51         }                                                                     \
  52                                                                               \
  53       /* Fill with zeroes.  */                                                \
  54       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  55         {                                                                     \
  56           *--numstr = '0';                                                    \
  57           *--wnumstr = L'0';                                                  \
  58         }                                                                     \
  59                                                                               \
  60       /* We use a full nibble for the leading digit.  */                      \
  61       leading = *numstr++;                                                    \
  62                                                                               \
  63       /* We have 3 bits from the mantissa in the leading nibble.              \
  64          Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
  65       exponent = fpnum.ldbl.ieee.exponent;                                    \
  66                                                                               \
  67       if (exponent == 0)                                                      \
  68         {                                                                     \
  69           if (zero_mantissa)                                                  \
  70             expnegative = 0;                                                  \
  71           else                                                                \
  72             {                                                                 \
  73               /* This is a denormalized number.  */                           \
  74               expnegative = 1;                                                \
  75               /* This is a hook for the m68k long double format, where the    \
  76                  exponent bias is the same for normalized and denormalized    \
  77                  numbers.  */                                                 \
  78               exponent = LONG_DOUBLE_DENORM_BIAS + 3;                         \
  79             }                                                                 \
  80         }                                                                     \
  81       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)                      \
  82         {                                                                     \
  83           expnegative = 0;                                                    \
  84           exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;                           \
  85         }                                                                     \
  86       else                                                                    \
  87         {                                                                     \
  88           expnegative = 1;                                                    \
  89           exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));            \
  90         }                                                                     \
  91 } while (0)
  92
  93 #include <stdio-common/printf_fphex.c>