Avoid setting LC_NUMERIC on MS-Windows to anything but "C"

* src/emacs.c (synchronize_locale) [WINDOWSNT]: Call fixup_locale
after setting LC_ALL to the desired locale, to avoid affecting how
numbers are read and printed.  (Bug#21223)

1 files changed, 10 insertions, 4 deletions

diff --git a/src/emacs.c b/src/emacs.c
index 6e35496eb8a..aace618b300 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -2154,17 +2154,23 @@ synchronize_locale (int category, Lisp_Object *plocale, Lisp_Object desired_loca
 {
   if (! EQ (*plocale, desired_locale))
     {
+      *plocale = desired_locale;
 #ifdef WINDOWSNT
       /* Changing categories like LC_TIME usually requires to specify
          an encoding suitable for the new locale, but MS-Windows's
          'setlocale' will only switch the encoding when LC_ALL is
-         specified.  So we ignore CATEGORY and use LC_ALL instead.  */
-      category = LC_ALL;
-#endif
-      *plocale = desired_locale;
+         specified.  So we ignore CATEGORY, use LC_ALL instead, and
+         then restore LC_NUMERIC to "C", so reading and printing
+         numbers is unaffected.  */
+      setlocale (LC_ALL, (STRINGP (desired_locale)
+                          ? SSDATA (desired_locale)
+                          : ""));
+      fixup_locale ();
+#else  /* !WINDOWSNT */
       setlocale (category, (STRINGP (desired_locale)
                             ? SSDATA (desired_locale)
                             : ""));
+#endif  /* !WINDOWSNT */
     }
 }