/* Compatibility functions for floating point formatting, reentrant versions.
- Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1995-2019 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.
+ 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
- Library General Public License for more details.
+ Lesser 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. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#include <errno.h>
+#include <float.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <sys/param.h>
+#include <math_ldbl_opt.h>
#ifndef FLOAT_TYPE
# define FLOAT_TYPE double
# define FUNC_PREFIX
# define FLOAT_FMT_FLAG
# define FLOAT_NAME_EXT
+# define FLOAT_MIN_10_EXP DBL_MIN_10_EXP
# if DBL_MANT_DIG == 53
# define NDIGIT_MAX 17
# elif DBL_MANT_DIG == 24
# error "NDIGIT_MAX must be precomputed"
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
# endif
+# if DBL_MIN_10_EXP == -37
+# define FLOAT_MIN_10_NORM 1.0e-37
+# elif DBL_MIN_10_EXP == -307
+# define FLOAT_MIN_10_NORM 1.0e-307
+# elif DBL_MIN_10_EXP == -4931
+# define FLOAT_MIN_10_NORM 1.0e-4931
+# else
+/* libc can't depend on libm. */
+# error "FLOAT_MIN_10_NORM must be precomputed"
+# define FLOAT_MIN_10_NORM exp10 (DBL_MIN_10_EXP)
+# 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 FLOOR APPEND(floor, FLOAT_NAME_EXT)
#define FABS APPEND(fabs, 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;
+__APPEND (FUNC_PREFIX, fcvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
+ int *sign, char *buf, size_t len)
{
- int n, i;
+ ssize_t n;
+ ssize_t i;
int left;
if (buf == NULL)
n = __snprintf (buf, len, "%.*" FLOAT_FMT_FLAG "f", MIN (ndigit, NDIGIT_MAX),
value);
- if (n < 0)
+ /* Check for a too small buffer. */
+ if (n >= (ssize_t) len)
return -1;
i = 0;
if (left)
{
*decpt += left;
- if (--len > n)
+ if ((ssize_t) --len > n)
{
- while (left-- > 0 && n < len)
+ while (left-- > 0 && n < (ssize_t) len)
buf[n++] = '0';
buf[n] = '\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;
+__APPEND (FUNC_PREFIX, ecvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
+ int *sign, char *buf, size_t len)
{
int exponent = 0;
d = -value;
else
d = value;
+ /* For denormalized numbers the d < 1.0 case below won't work,
+ as f can overflow to +Inf. */
+ if (d < FLOAT_MIN_10_NORM)
+ {
+ value /= FLOAT_MIN_10_NORM;
+ if (value < 0.0)
+ d = -value;
+ else
+ d = value;
+ exponent += FLOAT_MIN_10_EXP;
+ }
if (d < 1.0)
{
do
*sign = isfinite (value) ? signbit (value) != 0 : 0;
}
else
- if (APPEND (FUNC_PREFIX, fcvt_r) (value, MIN (ndigit, NDIGIT_MAX) - 1,
- decpt, sign, buf, len))
+ if (__APPEND (FUNC_PREFIX, fcvt_r) (value, MIN (ndigit, NDIGIT_MAX) - 1,
+ decpt, sign, buf, len))
return -1;
*decpt += exponent;
return 0;
}
+
+#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) \
+ libc_hidden_def (local) \
+ 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); \
+ weak_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
+# define cvt_symbol_1(lib, local, symbol, version) \
+ libc_hidden_def (local) \
+ compat_symbol (lib, local, symbol, version)
+# endif
+#else
+# define cvt_symbol(symbol) \
+ cvt_symbol_1 (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
+# define cvt_symbol_1(local, symbol) \
+ libc_hidden_def (local) \
+ weak_alias (local, symbol)
+#endif
+cvt_symbol(fcvt_r);
+cvt_symbol(ecvt_r);
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