1 /* Convert string to double, using the C locale.
3 Copyright (C) 2003, 2004, 2006, 2009 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by Paul Eggert. */
31 # define C_STRTOD c_strtold
32 # define DOUBLE long double
33 # define STRTOD_L strtold_l
35 # define C_STRTOD c_strtod
36 # define DOUBLE double
37 # define STRTOD_L strtod_l
40 /* c_strtold falls back on strtod if strtold doesn't conform to C99. */
41 #if LONG && HAVE_C99_STRTOLD
42 # define STRTOD strtold
44 # define STRTOD strtod
49 /* Cache for the C locale object.
50 Marked volatile so that different threads see the same value
52 static volatile locale_t c_locale_cache;
54 /* Return the C locale object, or (locale_t) 0 with errno set
55 if it cannot be created. */
56 static inline locale_t
60 c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
61 return c_locale_cache;
67 C_STRTOD (char const *nptr, char **endptr)
73 locale_t locale = c_locale ();
78 return 0; /* errno is set here */
81 r = STRTOD_L (nptr, endptr, locale);
85 char *saved_locale = setlocale (LC_NUMERIC, NULL);
89 saved_locale = xstrdup (saved_locale);
90 setlocale (LC_NUMERIC, "C");
93 r = STRTOD (nptr, endptr);
97 int saved_errno = errno;
99 setlocale (LC_NUMERIC, saved_locale);