+ {
+ const char *cs = nl_langinfo (CODESET);
+ if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0)
+ return 1;
+ }
+#endif
+#ifdef __CYGWIN__
+ /* On Cygwin, avoid locale names without encoding suffix, because the
+ locale_charset() function relies on the encoding suffix. Note that
+ LC_ALL is set on the command line. */
+ if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;