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/* Convert string to double, using the C locale.
Copyright (C) 2003-2004, 2006, 2009-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include "c-strtod.h"
#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#if LONG
# define C_STRTOD c_strtold
# define DOUBLE long double
# define STRTOD_L strtold_l
# define HAVE_GOOD_STRTOD_L (HAVE_STRTOLD_L && !GNULIB_defined_strtold_function)
# define STRTOD strtold
#else
# define C_STRTOD c_strtod
# define DOUBLE double
# define STRTOD_L strtod_l
# define HAVE_GOOD_STRTOD_L (HAVE_STRTOD_L && !GNULIB_defined_strtod_function)
# define STRTOD strtod
#endif
#if defined LC_ALL_MASK \
&& ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
|| HAVE_WORKING_USELOCALE)
/* Cache for the C locale object.
Marked volatile so that different threads see the same value
(avoids locking). */
static volatile locale_t c_locale_cache;
/* Return the C locale object, or (locale_t) 0 with errno set
if it cannot be created. */
static locale_t
c_locale (void)
{
if (!c_locale_cache)
c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
return c_locale_cache;
}
#endif
DOUBLE
C_STRTOD (char const *nptr, char **endptr)
{
DOUBLE r;
#if defined LC_ALL_MASK \
&& ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
|| HAVE_WORKING_USELOCALE)
locale_t locale = c_locale ();
if (!locale)
{
if (endptr)
*endptr = (char *) nptr;
return 0; /* errno is set here */
}
# if (LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L)
r = STRTOD_L (nptr, endptr, locale);
# else /* HAVE_WORKING_USELOCALE */
locale_t old_locale = uselocale (locale);
if (old_locale == (locale_t)0)
{
if (endptr)
*endptr = (char *) nptr;
return 0; /* errno is set here */
}
r = STRTOD (nptr, endptr);
int saved_errno = errno;
if (uselocale (old_locale) == (locale_t)0)
/* We can't switch back to the old locale. The thread is hosed. */
abort ();
errno = saved_errno;
# endif
#else
char *saved_locale = setlocale (LC_NUMERIC, NULL);
if (saved_locale)
{
saved_locale = strdup (saved_locale);
if (saved_locale == NULL)
{
if (endptr)
*endptr = (char *) nptr;
return 0; /* errno is set here */
}
setlocale (LC_NUMERIC, "C");
}
r = STRTOD (nptr, endptr);
if (saved_locale)
{
int saved_errno = errno;
setlocale (LC_NUMERIC, saved_locale);
free (saved_locale);
errno = saved_errno;
}
#endif
return r;
}
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