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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-96/printf_fphex.c
1 /* Print floating point number in hexadecimal notation according to ISO C99.
2 Copyright (C) 1997-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #ifndef LONG_DOUBLE_DENORM_BIAS
20 # define LONG_DOUBLE_DENORM_BIAS (IEEE854_LONG_DOUBLE_BIAS - 1)
23 #define PRINT_FPHEX_LONG_DOUBLE \
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; \
31 assert (sizeof (long double) == 12); \
33 num = (((unsigned long long int) u.ieee.mantissa0) << 32 \
34 | u.ieee.mantissa1); \
36 zero_mantissa = num == 0; \
38 if (sizeof (unsigned long int) > 6) \
39 numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
42 numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A'); \
44 /* Fill with zeroes. */ \
45 while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
48 /* We use a full nibble for the leading digit. */ \
49 leading = *numstr++; \
51 /* We have 3 bits from the mantissa in the leading nibble. \
52 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
53 exponent = u.ieee.exponent; \
61 /* This is a denormalized number. */ \
63 /* This is a hook for the m68k long double format, where the \
64 exponent bias is the same for normalized and denormalized \
66 exponent = LONG_DOUBLE_DENORM_BIAS + 3; \
69 else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) \
72 exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; \
77 exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); \
81 #include <stdio-common/printf_fphex.c>