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/* Compatibility functions for floating point formatting, reentrant versions.
Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <sys/param.h>
#ifndef FLOAT_TYPE
# define FLOAT_TYPE double
# define FUNC_PREFIX
# define FLOAT_FMT_FLAG
# define FLOAT_NAME_EXT
# 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
#endif
#define APPEND(a, b) APPEND2 (a, b)
#define APPEND2(a, b) a##b
#define FLOOR APPEND(floor, FLOAT_NAME_EXT)
#define FABS APPEND(fabs, FLOAT_NAME_EXT)
#define LOG10 APPEND(log10, FLOAT_NAME_EXT)
#define EXP APPEND(exp, FLOAT_NAME_EXT)
int
APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign, buf, len)
FLOAT_TYPE value;
int ndigit, *decpt, *sign;
char *buf;
size_t len;
{
int n, i;
int left;
if (buf == NULL)
{
__set_errno (EINVAL);
return -1;
}
left = 0;
if (isfinite (value))
{
*sign = signbit (value) != 0;
if (*sign)
value = -value;
if (ndigit < 0)
{
/* Rounding to the left of the decimal point. */
while (ndigit < 0)
{
FLOAT_TYPE new_value = value * 0.1;
if (new_value < 1.0)
{
ndigit = 0;
break;
}
value = new_value;
++left;
++ndigit;
}
}
}
else
/* Value is Inf or NaN. */
*sign = 0;
n = __snprintf (buf, len, "%.*" FLOAT_FMT_FLAG "f", MIN (ndigit, NDIGIT_MAX),
value);
/* Check for a too small buffer. */
if (n >= len)
return -1;
i = 0;
while (i < n && isdigit (buf[i]))
++i;
*decpt = i;
if (i == 0)
/* Value is Inf or NaN. */
return 0;
if (i < n)
{
do
++i;
while (i < n && !isdigit (buf[i]));
if (*decpt == 1 && buf[0] == '0' && value != 0.0)
{
/* We must not have leading zeroes. Strip them all out and
adjust *DECPT if necessary. */
--*decpt;
while (i < n && buf[i] == '0')
{
--*decpt;
++i;
}
}
memmove (&buf[MAX (*decpt, 0)], &buf[i], n - i);
buf[n - (i - MAX (*decpt, 0))] = '\0';
}
if (left)
{
*decpt += left;
if (--len > n)
{
while (left-- > 0 && n < len)
buf[n++] = '0';
buf[n] = '\0';
}
}
return 0;
}
int
APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign, buf, len)
FLOAT_TYPE value;
int ndigit, *decpt, *sign;
char *buf;
size_t len;
{
int exponent = 0;
if (isfinite (value) && value != 0.0)
{
/* Slow code that doesn't require -lm functions. */
FLOAT_TYPE d;
FLOAT_TYPE f = 1.0;
if (value < 0.0)
d = -value;
else
d = value;
if (d < 1.0)
{
do
{
f *= 10.0;
--exponent;
}
while (d * f < 1.0);
value *= f;
}
else if (d >= 10.0)
{
do
{
f *= 10;
++exponent;
}
while (d >= f * 10.0);
value /= f;
}
}
else if (value == 0.0)
/* SUSv2 leaves it unspecified whether *DECPT is 0 or 1 for 0.0.
This could be changed to -1 if we want to return 0. */
exponent = 0;
if (ndigit <= 0 && len > 0)
{
buf[0] = '\0';
*decpt = 1;
*sign = isfinite (value) ? signbit (value) != 0 : 0;
}
else
if (APPEND (FUNC_PREFIX, fcvt_r) (value, MIN (ndigit, NDIGIT_MAX) - 1,
decpt, sign, buf, len))
return -1;
*decpt += exponent;
return 0;
}
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