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 \
24do { \
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>
79