mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/* Compatibility functions for floating point formatting.
|
|
Copyright (C) 1995-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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 <math.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/param.h>
|
|
#include <float.h>
|
|
#include <bits/libc-lock.h>
|
|
#include <math_ldbl_opt.h>
|
|
|
|
#ifndef FLOAT_TYPE
|
|
# define FLOAT_TYPE double
|
|
# define FUNC_PREFIX
|
|
# define FLOAT_FMT_FLAG
|
|
/* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we
|
|
don't have log10 available in the preprocessor. */
|
|
# define MAXDIG (NDIGIT_MAX + 3)
|
|
# define FCVT_MAXDIG (DBL_MAX_10_EXP + MAXDIG)
|
|
# if DBL_MANT_DIG == 53
|
|
# define NDIGIT_MAX 17
|
|
# elif DBL_MANT_DIG == 24
|
|
# define NDIGIT_MAX 9
|
|
# elif DBL_MANT_DIG == 56
|
|
# define NDIGIT_MAX 18
|
|
# else
|
|
/* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a
|
|
compile time constant here, so we cannot use it. */
|
|
# error "NDIGIT_MAX must be precomputed"
|
|
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
|
|
# endif
|
|
#else
|
|
# define LONG_DOUBLE_CVT
|
|
#endif
|
|
|
|
#define APPEND(a, b) APPEND2 (a, b)
|
|
#define APPEND2(a, b) a##b
|
|
#define __APPEND(a, b) __APPEND2 (a, b)
|
|
#define __APPEND2(a, b) __##a##b
|
|
|
|
|
|
#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
|
|
#define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr)
|
|
#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
|
|
|
|
|
|
static char FCVT_BUFFER[MAXDIG];
|
|
static char ECVT_BUFFER[MAXDIG];
|
|
libc_freeres_ptr (static char *FCVT_BUFPTR);
|
|
|
|
char *
|
|
__APPEND (FUNC_PREFIX, fcvt) (value, ndigit, decpt, sign)
|
|
FLOAT_TYPE value;
|
|
int ndigit, *decpt, *sign;
|
|
{
|
|
if (FCVT_BUFPTR == NULL)
|
|
{
|
|
if (__APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
|
|
FCVT_BUFFER, MAXDIG) != -1)
|
|
return FCVT_BUFFER;
|
|
|
|
FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG);
|
|
if (FCVT_BUFPTR == NULL)
|
|
return FCVT_BUFFER;
|
|
}
|
|
|
|
(void) __APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
|
|
FCVT_BUFPTR, FCVT_MAXDIG);
|
|
|
|
return FCVT_BUFPTR;
|
|
}
|
|
|
|
|
|
char *
|
|
__APPEND (FUNC_PREFIX, ecvt) (value, ndigit, decpt, sign)
|
|
FLOAT_TYPE value;
|
|
int ndigit, *decpt, *sign;
|
|
{
|
|
(void) __APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign,
|
|
ECVT_BUFFER, MAXDIG);
|
|
|
|
return ECVT_BUFFER;
|
|
}
|
|
|
|
char *
|
|
__APPEND (FUNC_PREFIX, gcvt) (value, ndigit, buf)
|
|
FLOAT_TYPE value;
|
|
int ndigit;
|
|
char *buf;
|
|
{
|
|
sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
|
|
return buf;
|
|
}
|
|
|
|
#if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
|
|
# ifdef LONG_DOUBLE_CVT
|
|
# define cvt_symbol(symbol) \
|
|
cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \
|
|
APPEND (FUNC_PREFIX, symbol), GLIBC_2_4)
|
|
# define cvt_symbol_1(lib, local, symbol, version) \
|
|
versioned_symbol (lib, local, symbol, version)
|
|
# else
|
|
# define cvt_symbol(symbol) \
|
|
cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \
|
|
APPEND (q, symbol), GLIBC_2_0); \
|
|
strong_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
|
|
# define cvt_symbol_1(lib, local, symbol, version) \
|
|
compat_symbol (lib, local, symbol, version)
|
|
# endif
|
|
#else
|
|
# define cvt_symbol(symbol) \
|
|
strong_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
|
|
#endif
|
|
cvt_symbol(fcvt);
|
|
cvt_symbol(ecvt);
|
|
cvt_symbol(gcvt);
|