+ {
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+ if (category == LC_ALL && locale != NULL && strchr (locale, '.') != NULL)
+ {
+ char *saved_locale;
+
+ /* Back up the old locale. */
+ saved_locale = setlocale (LC_ALL, NULL);
+ if (saved_locale == NULL)
+ return NULL;
+ saved_locale = strdup (saved_locale);
+ if (saved_locale == NULL)
+ return NULL;
+
+ if (setlocale_unixlike (LC_ALL, locale) == NULL)
+ {
+ free (saved_locale);
+ return NULL;
+ }
+
+ /* On native Windows, setlocale(LC_ALL,...) may succeed but set the
+ LC_CTYPE category to an invalid value ("C") when it does not
+ support the specified encoding. Report a failure instead. */
+ if (strcmp (setlocale (LC_CTYPE, NULL), "C") == 0)
+ {
+ if (saved_locale[0] != '\0') /* don't risk an endless recursion */
+ setlocale (LC_ALL, saved_locale);
+ free (saved_locale);
+ return NULL;
+ }
+
+ /* It was really successful. */
+ free (saved_locale);
+ return setlocale (LC_ALL, NULL);
+ }
+ else
+# endif
+ return setlocale_single (category, locale);
+ }