1/* Print floating point number in hexadecimal notation according to ISO C99.
2 Copyright (C) 1997-2022 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 assert (sizeof (long double) == 12); \
32 \
33 num = (((unsigned long long int) u.ieee.mantissa0) << 32 \
34 | u.ieee.mantissa1); \
35 \
36 zero_mantissa = num == 0; \
37 \
38 if (sizeof (unsigned long int) > 6) \
39 { \
40 numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
41 info->spec == 'A'); \
42 wnumstr = _itowa_word (num, \
43 wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
44 16, info->spec == 'A'); \
45 } \
46 else \
47 { \
48 numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
49 wnumstr = _itowa (num, \
50 wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
51 16, info->spec == 'A'); \
52 } \
53 \
54 /* Fill with zeroes. */ \
55 while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
56 { \
57 *--numstr = '0'; \
58 *--wnumstr = L'0'; \
59 } \
60 \
61 /* We use a full nibble for the leading digit. */ \
62 leading = *numstr++; \
63 wnumstr++; \
64 \
65 /* We have 3 bits from the mantissa in the leading nibble. \
66 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
67 exponent = u.ieee.exponent; \
68 \
69 if (exponent == 0) \
70 { \
71 if (zero_mantissa) \
72 expnegative = 0; \
73 else \
74 { \
75 /* This is a denormalized number. */ \
76 expnegative = 1; \
77 /* This is a hook for the m68k long double format, where the \
78 exponent bias is the same for normalized and denormalized \
79 numbers. */ \
80 exponent = LONG_DOUBLE_DENORM_BIAS + 3; \
81 } \
82 } \
83 else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) \
84 { \
85 expnegative = 0; \
86 exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; \
87 } \
88 else \
89 { \
90 expnegative = 1; \
91 exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); \
92 } \
93} while (0)
94
95#include <stdio-common/printf_fphex.c>
96

source code of glibc/sysdeps/ieee754/ldbl-96/printf_fphex.c