1  /* Print floating point number in hexadecimal notation according to ISO C99.
       2     Copyright (C) 1997-2023 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     <https://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        num = (((unsigned long long int) u.ieee.mantissa0) << 32		      \
      32  	     | u.ieee.mantissa1);					      \
      33  									      \
      34        zero_mantissa = num == 0;						      \
      35  									      \
      36        if (sizeof (unsigned long int) > 6)				      \
      37  	numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
      38        else								      \
      39  	numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');  \
      40  									      \
      41        /* Fill with zeroes.  */						      \
      42        while (numstr > numbuf + (sizeof numbuf - 64 / 4))		      \
      43  	*--numstr = '0';						      \
      44  									      \
      45        /* We use a full nibble for the leading digit.  */		      \
      46        leading = *numstr++;						      \
      47  									      \
      48        /* We have 3 bits from the mantissa in the leading nibble.	      \
      49  	 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
      50        exponent = u.ieee.exponent;					      \
      51  									      \
      52        if (exponent == 0)						      \
      53  	{								      \
      54  	  if (zero_mantissa)						      \
      55  	    expnegative = 0;						      \
      56  	  else								      \
      57  	    {								      \
      58  	      /* This is a denormalized number.  */			      \
      59  	      expnegative = 1;						      \
      60  	      /* This is a hook for the m68k long double format, where the    \
      61  		 exponent bias is the same for normalized and denormalized    \
      62  		 numbers.  */						      \
      63  	      exponent = LONG_DOUBLE_DENORM_BIAS + 3;			      \
      64  	    }								      \
      65  	}								      \
      66        else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)		      \
      67  	{								      \
      68  	  expnegative = 0;						      \
      69  	  exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;			      \
      70  	}								      \
      71        else								      \
      72  	{								      \
      73  	  expnegative = 1;						      \
      74  	  exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));	      \
      75  	}								      \
      76  } while (0)
      77  
      78  #include <stdio-common/printf_fphex.c>