1 /* Print floating point number in hexadecimal notation according to ISO C99.
2    Copyright (C) 2000-2021 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 ia64 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       numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,		      \
37 			   info->spec == 'A');				      \
38       wnumstr = _itowa_word (num,					      \
39 			     wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),   \
40 			     16, info->spec == 'A');			      \
41 									      \
42       /* Fill with zeroes.  */						      \
43       while (numstr > numbuf + (sizeof numbuf - 64 / 4))		      \
44 	{								      \
45 	  *--numstr = '0';						      \
46 	  *--wnumstr = L'0';						      \
47 	}								      \
48 									      \
49       /* We use a full nibble for the leading digit.  */		      \
50       leading = *numstr++;						      \
51 									      \
52       /* We have 3 bits from the mantissa in the leading nibble.	      \
53 	 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
54       exponent = u.ieee.exponent;					      \
55 									      \
56       if (exponent == 0)						      \
57 	{								      \
58 	  if (zero_mantissa)						      \
59 	    expnegative = 0;						      \
60 	  else								      \
61 	    {								      \
62 	      /* This is a denormalized number.  */			      \
63 	      expnegative = 1;						      \
64 	      /* This is a hook for the m68k long double format, where the    \
65 		 exponent bias is the same for normalized and denormalized    \
66 		 numbers.  */						      \
67 	      exponent = LONG_DOUBLE_DENORM_BIAS + 3;			      \
68 	    }								      \
69 	}								      \
70       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)		      \
71 	{								      \
72 	  expnegative = 0;						      \
73 	  exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;			      \
74 	}								      \
75       else								      \
76 	{								      \
77 	  expnegative = 1;						      \
78 	  exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));	      \
79 	}								      \
80 } while (0)
81 
82 #include <stdio-common/printf_fphex.c>
83