mirror of
https://sourceware.org/git/glibc.git
synced 2025-07-28 00:21:52 +03:00
2.5-18.1
This commit is contained in:
Jakub Jelinek
493
stdio-common/printf_fphex.c
Normal file
493
stdio-common/printf_fphex.c
Normal file
@ -0,0 +1,493 @@
|
||||
/* Print floating point number in hexadecimal notation according to ISO C99.
|
||||
Copyright (C) 1997-2002,2004,2006 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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#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>
|
||||
|
||||
/* #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. */
|
||||
#ifdef USE_IN_LIBIO
|
||||
# include <libioP.h>
|
||||
# define PUT(f, s, n) _IO_sputn (f, s, n)
|
||||
# define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : INTUSE(_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
|
||||
#else /* ! USE_IN_LIBIO */
|
||||
# define PUT(f, s, n) fwrite (s, 1, n, f)
|
||||
# define PAD(f, c, n) __printf_pad (f, c, n)
|
||||
ssize_t __printf_pad (FILE *, char pad, int n) __THROW; /* In vfprintf.c. */
|
||||
#endif /* USE_IN_LIBIO */
|
||||
|
||||
/* Macros for doing the actual output. */
|
||||
|
||||
#define outchar(ch) \
|
||||
do \
|
||||
{ \
|
||||
register const int outc = (ch); \
|
||||
if (putc (outc, fp) == EOF) \
|
||||
return -1; \
|
||||
++done; \
|
||||
} while (0)
|
||||
|
||||
#define PRINT(ptr, wptr, len) \
|
||||
do \
|
||||
{ \
|
||||
register 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;
|
||||
union ieee854_long_double ldbl;
|
||||
}
|
||||
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');
|
||||
|
||||
|
||||
/* Fetch the argument value. */
|
||||
#ifndef __NO_LONG_DOUBLE_MATH
|
||||
if (info->is_long_double && sizeof (long double) > sizeof (double))
|
||||
{
|
||||
fpnum.ldbl.d = *(const long double *) args[0];
|
||||
|
||||
/* Check for special values: not a number or infinity. */
|
||||
if (__isnanl (fpnum.ldbl.d))
|
||||
{
|
||||
if (isupper (info->spec))
|
||||
{
|
||||
special = "NAN";
|
||||
wspecial = L"NAN";
|
||||
}
|
||||
else
|
||||
{
|
||||
special = "nan";
|
||||
wspecial = L"nan";
|
||||
}
|
||||
negative = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (__isinfl (fpnum.ldbl.d))
|
||||
{
|
||||
if (isupper (info->spec))
|
||||
{
|
||||
special = "INF";
|
||||
wspecial = L"INF";
|
||||
}
|
||||
else
|
||||
{
|
||||
special = "inf";
|
||||
wspecial = L"inf";
|
||||
}
|
||||
}
|
||||
|
||||
negative = signbit (fpnum.ldbl.d);
|
||||
}
|
||||
}
|
||||
else
|
||||
#endif /* no long double */
|
||||
{
|
||||
fpnum.dbl.d = *(const double *) args[0];
|
||||
|
||||
/* Check for special values: not a number or infinity. */
|
||||
if (__isnan (fpnum.dbl.d))
|
||||
{
|
||||
if (isupper (info->spec))
|
||||
{
|
||||
special = "NAN";
|
||||
wspecial = L"NAN";
|
||||
}
|
||||
else
|
||||
{
|
||||
special = "nan";
|
||||
wspecial = L"nan";
|
||||
}
|
||||
negative = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (__isinf (fpnum.dbl.d))
|
||||
{
|
||||
if (isupper (info->spec))
|
||||
{
|
||||
special = "INF";
|
||||
wspecial = L"INF";
|
||||
}
|
||||
else
|
||||
{
|
||||
special = "inf";
|
||||
wspecial = L"inf";
|
||||
}
|
||||
}
|
||||
|
||||
negative = signbit (fpnum.dbl.d);
|
||||
}
|
||||
}
|
||||
|
||||
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 (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;
|
||||
}
|
||||
|
||||
if (precision == -1)
|
||||
precision = numend - numstr;
|
||||
else if (precision < numend - numstr
|
||||
&& (numstr[precision] > '8'
|
||||
|| (('A' < '0' || 'a' < '0')
|
||||
&& numstr[precision] < '0')
|
||||
|| (numstr[precision] == '8'
|
||||
&& (precision + 1 < numend - numstr
|
||||
/* Round to even. */
|
||||
|| (precision > 0
|
||||
&& ((numstr[precision - 1] & 1)
|
||||
^ (isdigit (numstr[precision - 1]) == 0)))
|
||||
|| (precision == 0
|
||||
&& ((leading & 1)
|
||||
^ (isdigit (leading) == 0)))))))
|
||||
{
|
||||
/* 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;
|
||||
}
|
||||
Reference in New Issue
Block a user