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 \ 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 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