136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/* Convert string to double, using the C locale.
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Copyright (C) 2003-2004, 2006, 2009-2022 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "c-strtod.h"
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#include <errno.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#if LONG
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# define C_STRTOD c_strtold
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# define DOUBLE long double
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# define STRTOD_L strtold_l
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# define HAVE_GOOD_STRTOD_L (HAVE_STRTOLD_L && !GNULIB_defined_strtold_function)
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# define STRTOD strtold
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#else
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# define C_STRTOD c_strtod
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# define DOUBLE double
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# define STRTOD_L strtod_l
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# define HAVE_GOOD_STRTOD_L (HAVE_STRTOD_L && !GNULIB_defined_strtod_function)
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# define STRTOD strtod
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#endif
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#if defined LC_ALL_MASK \
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&& ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
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|| HAVE_WORKING_USELOCALE)
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/* Cache for the C locale object.
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Marked volatile so that different threads see the same value
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(avoids locking). */
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static volatile locale_t c_locale_cache;
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/* Return the C locale object, or (locale_t) 0 with errno set
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if it cannot be created. */
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static locale_t
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c_locale (void)
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{
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if (!c_locale_cache)
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c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
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return c_locale_cache;
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}
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#endif
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DOUBLE
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C_STRTOD (char const *nptr, char **endptr)
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{
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DOUBLE r;
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#if defined LC_ALL_MASK \
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&& ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
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|| HAVE_WORKING_USELOCALE)
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locale_t locale = c_locale ();
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if (!locale)
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{
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if (endptr)
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*endptr = (char *) nptr;
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return 0; /* errno is set here */
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}
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# if (LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L)
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r = STRTOD_L (nptr, endptr, locale);
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# else /* HAVE_WORKING_USELOCALE */
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locale_t old_locale = uselocale (locale);
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if (old_locale == (locale_t)0)
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{
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if (endptr)
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*endptr = (char *) nptr;
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return 0; /* errno is set here */
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}
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r = STRTOD (nptr, endptr);
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int saved_errno = errno;
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if (uselocale (old_locale) == (locale_t)0)
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/* We can't switch back to the old locale. The thread is hosed. */
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abort ();
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errno = saved_errno;
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# endif
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#else
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char *saved_locale = setlocale (LC_NUMERIC, NULL);
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if (saved_locale)
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{
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saved_locale = strdup (saved_locale);
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if (saved_locale == NULL)
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{
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if (endptr)
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*endptr = (char *) nptr;
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return 0; /* errno is set here */
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}
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setlocale (LC_NUMERIC, "C");
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}
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r = STRTOD (nptr, endptr);
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if (saved_locale)
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{
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int saved_errno = errno;
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setlocale (LC_NUMERIC, saved_locale);
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free (saved_locale);
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errno = saved_errno;
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}
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#endif
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return r;
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}
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