mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 05:50:14 +00:00
cf2046ec7d
Add strfromf128 to stdlib when _Float128 support is enabled. * stdio-common/printf-parsemb.c (__parse_one_specmb): Initialize spec->info.is_binary128 to zero. * stdio-common/printf.h (printf_info): Add new member is_binary128 to indicate that the number being converted to string is compatible with the IEC 60559 binary128 format. * stdio-common/printf_fp.c (__printf_fp_l): Add code to deal with _Float128 numbers. * stdio-common/printf_fphex.c: Include ieee754_float128.h and ldbl-128/printf_fphex_macros.h (__printf_fphex): Add code to deal with _Float128 numbers. * stdio-common/printf_size.c (__printf_size): Likewise. * stdio-common/vfprintf.c (process_arg): Initialize member info.is_binary128 to zero. * stdlib/fpioconst.h (FLT128_MAX_10_EXP_LOG): New macro. * stdlib/stdlib.h: Include bits/floatn.h for _Float128 support. (strfromf128): New declaration. * stdlib/strfrom-skeleton.c (STRFROM): Set member info.is_binary128 to one. * sysdeps/ieee754/float128/Makefile: Add strfromf128. * sysdeps/ieee754/float128/Versions: Likewise. * sysdeps/ieee754/float128/strfromf128.c: New file.
488 lines
12 KiB
C
488 lines
12 KiB
C
/* Print floating point number in hexadecimal notation according to ISO C99.
|
||
Copyright (C) 1997-2017 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
The GNU C Library is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, see
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
#include <ctype.h>
|
||
#include <ieee754.h>
|
||
#include <math.h>
|
||
#include <printf.h>
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <string.h>
|
||
#include <wchar.h>
|
||
#include <_itoa.h>
|
||
#include <_itowa.h>
|
||
#include <locale/localeinfo.h>
|
||
#include <stdbool.h>
|
||
#include <rounding-mode.h>
|
||
|
||
#if __HAVE_DISTINCT_FLOAT128
|
||
# include "ieee754_float128.h"
|
||
# include <ldbl-128/printf_fphex_macros.h>
|
||
# define PRINT_FPHEX_FLOAT128 \
|
||
PRINT_FPHEX (_Float128, fpnum.flt128, ieee854_float128, \
|
||
IEEE854_FLOAT128_BIAS)
|
||
#endif
|
||
|
||
/* #define NDEBUG 1*/ /* Undefine this for debugging assertions. */
|
||
#include <assert.h>
|
||
|
||
/* This defines make it possible to use the same code for GNU C library and
|
||
the GNU I/O library. */
|
||
#include <libioP.h>
|
||
#define PUT(f, s, n) _IO_sputn (f, s, n)
|
||
#define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : _IO_padn (f, c, n))
|
||
/* We use this file GNU C library and GNU I/O library. So make
|
||
names equal. */
|
||
#undef putc
|
||
#define putc(c, f) (wide \
|
||
? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
|
||
#define size_t _IO_size_t
|
||
#define FILE _IO_FILE
|
||
|
||
/* Macros for doing the actual output. */
|
||
|
||
#define outchar(ch) \
|
||
do \
|
||
{ \
|
||
const int outc = (ch); \
|
||
if (putc (outc, fp) == EOF) \
|
||
return -1; \
|
||
++done; \
|
||
} while (0)
|
||
|
||
#define PRINT(ptr, wptr, len) \
|
||
do \
|
||
{ \
|
||
size_t outlen = (len); \
|
||
if (wide) \
|
||
while (outlen-- > 0) \
|
||
outchar (*wptr++); \
|
||
else \
|
||
while (outlen-- > 0) \
|
||
outchar (*ptr++); \
|
||
} while (0)
|
||
|
||
#define PADN(ch, len) \
|
||
do \
|
||
{ \
|
||
if (PAD (fp, ch, len) != len) \
|
||
return -1; \
|
||
done += len; \
|
||
} \
|
||
while (0)
|
||
|
||
#ifndef MIN
|
||
# define MIN(a,b) ((a)<(b)?(a):(b))
|
||
#endif
|
||
|
||
|
||
int
|
||
__printf_fphex (FILE *fp,
|
||
const struct printf_info *info,
|
||
const void *const *args)
|
||
{
|
||
/* The floating-point value to output. */
|
||
union
|
||
{
|
||
union ieee754_double dbl;
|
||
long double ldbl;
|
||
#if __HAVE_DISTINCT_FLOAT128
|
||
_Float128 flt128;
|
||
#endif
|
||
}
|
||
fpnum;
|
||
|
||
/* Locale-dependent representation of decimal point. */
|
||
const char *decimal;
|
||
wchar_t decimalwc;
|
||
|
||
/* "NaN" or "Inf" for the special cases. */
|
||
const char *special = NULL;
|
||
const wchar_t *wspecial = NULL;
|
||
|
||
/* Buffer for the generated number string for the mantissa. The
|
||
maximal size for the mantissa is 128 bits. */
|
||
char numbuf[32];
|
||
char *numstr;
|
||
char *numend;
|
||
wchar_t wnumbuf[32];
|
||
wchar_t *wnumstr;
|
||
wchar_t *wnumend;
|
||
int negative;
|
||
|
||
/* The maximal exponent of two in decimal notation has 5 digits. */
|
||
char expbuf[5];
|
||
char *expstr;
|
||
wchar_t wexpbuf[5];
|
||
wchar_t *wexpstr;
|
||
int expnegative;
|
||
int exponent;
|
||
|
||
/* Non-zero is mantissa is zero. */
|
||
int zero_mantissa;
|
||
|
||
/* The leading digit before the decimal point. */
|
||
char leading;
|
||
|
||
/* Precision. */
|
||
int precision = info->prec;
|
||
|
||
/* Width. */
|
||
int width = info->width;
|
||
|
||
/* Number of characters written. */
|
||
int done = 0;
|
||
|
||
/* Nonzero if this is output on a wide character stream. */
|
||
int wide = info->wide;
|
||
|
||
|
||
/* Figure out the decimal point character. */
|
||
if (info->extra == 0)
|
||
{
|
||
decimal = _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
|
||
decimalwc = _NL_CURRENT_WORD (LC_NUMERIC, _NL_NUMERIC_DECIMAL_POINT_WC);
|
||
}
|
||
else
|
||
{
|
||
decimal = _NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT);
|
||
decimalwc = _NL_CURRENT_WORD (LC_MONETARY,
|
||
_NL_MONETARY_DECIMAL_POINT_WC);
|
||
}
|
||
/* The decimal point character must never be zero. */
|
||
assert (*decimal != '\0' && decimalwc != L'\0');
|
||
|
||
#define PRINTF_FPHEX_FETCH(FLOAT, VAR) \
|
||
{ \
|
||
(VAR) = *(const FLOAT *) args[0]; \
|
||
\
|
||
/* Check for special values: not a number or infinity. */ \
|
||
if (isnan (VAR)) \
|
||
{ \
|
||
if (isupper (info->spec)) \
|
||
{ \
|
||
special = "NAN"; \
|
||
wspecial = L"NAN"; \
|
||
} \
|
||
else \
|
||
{ \
|
||
special = "nan"; \
|
||
wspecial = L"nan"; \
|
||
} \
|
||
} \
|
||
else \
|
||
{ \
|
||
if (isinf (VAR)) \
|
||
{ \
|
||
if (isupper (info->spec)) \
|
||
{ \
|
||
special = "INF"; \
|
||
wspecial = L"INF"; \
|
||
} \
|
||
else \
|
||
{ \
|
||
special = "inf"; \
|
||
wspecial = L"inf"; \
|
||
} \
|
||
} \
|
||
} \
|
||
negative = signbit (VAR); \
|
||
}
|
||
|
||
/* Fetch the argument value. */
|
||
#if __HAVE_DISTINCT_FLOAT128
|
||
if (info->is_binary128)
|
||
PRINTF_FPHEX_FETCH (_Float128, fpnum.flt128)
|
||
else
|
||
#endif
|
||
#ifndef __NO_LONG_DOUBLE_MATH
|
||
if (info->is_long_double && sizeof (long double) > sizeof (double))
|
||
PRINTF_FPHEX_FETCH (long double, fpnum.ldbl)
|
||
else
|
||
#endif
|
||
PRINTF_FPHEX_FETCH (double, fpnum.dbl.d)
|
||
|
||
#undef PRINTF_FPHEX_FETCH
|
||
|
||
if (special)
|
||
{
|
||
int width = info->width;
|
||
|
||
if (negative || info->showsign || info->space)
|
||
--width;
|
||
width -= 3;
|
||
|
||
if (!info->left && width > 0)
|
||
PADN (' ', width);
|
||
|
||
if (negative)
|
||
outchar ('-');
|
||
else if (info->showsign)
|
||
outchar ('+');
|
||
else if (info->space)
|
||
outchar (' ');
|
||
|
||
PRINT (special, wspecial, 3);
|
||
|
||
if (info->left && width > 0)
|
||
PADN (' ', width);
|
||
|
||
return done;
|
||
}
|
||
|
||
#if __HAVE_DISTINCT_FLOAT128
|
||
if (info->is_binary128)
|
||
PRINT_FPHEX_FLOAT128;
|
||
else
|
||
#endif
|
||
if (info->is_long_double == 0 || sizeof (double) == sizeof (long double))
|
||
{
|
||
/* We have 52 bits of mantissa plus one implicit digit. Since
|
||
52 bits are representable without rest using hexadecimal
|
||
digits we use only the implicit digits for the number before
|
||
the decimal point. */
|
||
unsigned long long int num;
|
||
|
||
num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32
|
||
| fpnum.dbl.ieee.mantissa1);
|
||
|
||
zero_mantissa = num == 0;
|
||
|
||
if (sizeof (unsigned long int) > 6)
|
||
{
|
||
wnumstr = _itowa_word (num, wnumbuf + (sizeof wnumbuf) / sizeof (wchar_t), 16,
|
||
info->spec == 'A');
|
||
numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
|
||
info->spec == 'A');
|
||
}
|
||
else
|
||
{
|
||
wnumstr = _itowa (num, wnumbuf + sizeof wnumbuf / sizeof (wchar_t), 16,
|
||
info->spec == 'A');
|
||
numstr = _itoa (num, numbuf + sizeof numbuf, 16,
|
||
info->spec == 'A');
|
||
}
|
||
|
||
/* Fill with zeroes. */
|
||
while (wnumstr > wnumbuf + (sizeof wnumbuf - 52) / sizeof (wchar_t))
|
||
{
|
||
*--wnumstr = L'0';
|
||
*--numstr = '0';
|
||
}
|
||
|
||
leading = fpnum.dbl.ieee.exponent == 0 ? '0' : '1';
|
||
|
||
exponent = fpnum.dbl.ieee.exponent;
|
||
|
||
if (exponent == 0)
|
||
{
|
||
if (zero_mantissa)
|
||
expnegative = 0;
|
||
else
|
||
{
|
||
/* This is a denormalized number. */
|
||
expnegative = 1;
|
||
exponent = IEEE754_DOUBLE_BIAS - 1;
|
||
}
|
||
}
|
||
else if (exponent >= IEEE754_DOUBLE_BIAS)
|
||
{
|
||
expnegative = 0;
|
||
exponent -= IEEE754_DOUBLE_BIAS;
|
||
}
|
||
else
|
||
{
|
||
expnegative = 1;
|
||
exponent = -(exponent - IEEE754_DOUBLE_BIAS);
|
||
}
|
||
}
|
||
#ifdef PRINT_FPHEX_LONG_DOUBLE
|
||
else
|
||
PRINT_FPHEX_LONG_DOUBLE;
|
||
#endif
|
||
|
||
/* Look for trailing zeroes. */
|
||
if (! zero_mantissa)
|
||
{
|
||
wnumend = &wnumbuf[sizeof wnumbuf / sizeof wnumbuf[0]];
|
||
numend = &numbuf[sizeof numbuf / sizeof numbuf[0]];
|
||
while (wnumend[-1] == L'0')
|
||
{
|
||
--wnumend;
|
||
--numend;
|
||
}
|
||
|
||
bool do_round_away = false;
|
||
|
||
if (precision != -1 && precision < numend - numstr)
|
||
{
|
||
char last_digit = precision > 0 ? numstr[precision - 1] : leading;
|
||
char next_digit = numstr[precision];
|
||
int last_digit_value = (last_digit >= 'A' && last_digit <= 'F'
|
||
? last_digit - 'A' + 10
|
||
: (last_digit >= 'a' && last_digit <= 'f'
|
||
? last_digit - 'a' + 10
|
||
: last_digit - '0'));
|
||
int next_digit_value = (next_digit >= 'A' && next_digit <= 'F'
|
||
? next_digit - 'A' + 10
|
||
: (next_digit >= 'a' && next_digit <= 'f'
|
||
? next_digit - 'a' + 10
|
||
: next_digit - '0'));
|
||
bool more_bits = ((next_digit_value & 7) != 0
|
||
|| precision + 1 < numend - numstr);
|
||
int rounding_mode = get_rounding_mode ();
|
||
do_round_away = round_away (negative, last_digit_value & 1,
|
||
next_digit_value >= 8, more_bits,
|
||
rounding_mode);
|
||
}
|
||
|
||
if (precision == -1)
|
||
precision = numend - numstr;
|
||
else if (do_round_away)
|
||
{
|
||
/* Round up. */
|
||
int cnt = precision;
|
||
while (--cnt >= 0)
|
||
{
|
||
char ch = numstr[cnt];
|
||
/* We assume that the digits and the letters are ordered
|
||
like in ASCII. This is true for the rest of GNU, too. */
|
||
if (ch == '9')
|
||
{
|
||
wnumstr[cnt] = (wchar_t) info->spec;
|
||
numstr[cnt] = info->spec; /* This is tricky,
|
||
think about it! */
|
||
break;
|
||
}
|
||
else if (tolower (ch) < 'f')
|
||
{
|
||
++numstr[cnt];
|
||
++wnumstr[cnt];
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
numstr[cnt] = '0';
|
||
wnumstr[cnt] = L'0';
|
||
}
|
||
}
|
||
if (cnt < 0)
|
||
{
|
||
/* The mantissa so far was fff...f Now increment the
|
||
leading digit. Here it is again possible that we
|
||
get an overflow. */
|
||
if (leading == '9')
|
||
leading = info->spec;
|
||
else if (tolower (leading) < 'f')
|
||
++leading;
|
||
else
|
||
{
|
||
leading = '1';
|
||
if (expnegative)
|
||
{
|
||
exponent -= 4;
|
||
if (exponent <= 0)
|
||
{
|
||
exponent = -exponent;
|
||
expnegative = 0;
|
||
}
|
||
}
|
||
else
|
||
exponent += 4;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (precision == -1)
|
||
precision = 0;
|
||
numend = numstr;
|
||
wnumend = wnumstr;
|
||
}
|
||
|
||
/* Now we can compute the exponent string. */
|
||
expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0);
|
||
wexpstr = _itowa_word (exponent,
|
||
wexpbuf + sizeof wexpbuf / sizeof (wchar_t), 10, 0);
|
||
|
||
/* Now we have all information to compute the size. */
|
||
width -= ((negative || info->showsign || info->space)
|
||
/* Sign. */
|
||
+ 2 + 1 + 0 + precision + 1 + 1
|
||
/* 0x h . hhh P ExpoSign. */
|
||
+ ((expbuf + sizeof expbuf) - expstr));
|
||
/* Exponent. */
|
||
|
||
/* Count the decimal point.
|
||
A special case when the mantissa or the precision is zero and the `#'
|
||
is not given. In this case we must not print the decimal point. */
|
||
if (precision > 0 || info->alt)
|
||
width -= wide ? 1 : strlen (decimal);
|
||
|
||
if (!info->left && info->pad != '0' && width > 0)
|
||
PADN (' ', width);
|
||
|
||
if (negative)
|
||
outchar ('-');
|
||
else if (info->showsign)
|
||
outchar ('+');
|
||
else if (info->space)
|
||
outchar (' ');
|
||
|
||
outchar ('0');
|
||
if ('X' - 'A' == 'x' - 'a')
|
||
outchar (info->spec + ('x' - 'a'));
|
||
else
|
||
outchar (info->spec == 'A' ? 'X' : 'x');
|
||
|
||
if (!info->left && info->pad == '0' && width > 0)
|
||
PADN ('0', width);
|
||
|
||
outchar (leading);
|
||
|
||
if (precision > 0 || info->alt)
|
||
{
|
||
const wchar_t *wtmp = &decimalwc;
|
||
PRINT (decimal, wtmp, wide ? 1 : strlen (decimal));
|
||
}
|
||
|
||
if (precision > 0)
|
||
{
|
||
ssize_t tofill = precision - (numend - numstr);
|
||
PRINT (numstr, wnumstr, MIN (numend - numstr, precision));
|
||
if (tofill > 0)
|
||
PADN ('0', tofill);
|
||
}
|
||
|
||
if ('P' - 'A' == 'p' - 'a')
|
||
outchar (info->spec + ('p' - 'a'));
|
||
else
|
||
outchar (info->spec == 'A' ? 'P' : 'p');
|
||
|
||
outchar (expnegative ? '-' : '+');
|
||
|
||
PRINT (expstr, wexpstr, (expbuf + sizeof expbuf) - expstr);
|
||
|
||
if (info->left && info->pad != '0' && width > 0)
|
||
PADN (info->pad, width);
|
||
|
||
return done;
|
||
}
|