Export _tzname, expected by Mozilla.

dlls/msvcrt/msvcrt.spec

@@ -122,7 +122,7 @@
 @ cdecl __p__pgmptr()
 @ stub __p__pwctype #()
 @ cdecl __p__timezone()
-@ stub __p__tzname #()
+@ cdecl __p__tzname()
 @ cdecl __p__wcmdln()
 @ cdecl __p__wenviron()
 @ cdecl __p__winmajor()
@@ -472,7 +472,7 @@
 # extern _timezone
 @ cdecl _tolower(long) MSVCRT__tolower
 @ cdecl _toupper(long) MSVCRT__toupper
-# extern _tzname
+@ extern _tzname MSVCRT__tzname
 @ cdecl _tzset() tzset
 @ cdecl _ui64toa(long long ptr long) ntdll._ui64toa
 @ cdecl _ui64tow(long long ptr long) ntdll._ui64tow

dlls/msvcrt/time.c

@@ -309,3 +309,22 @@ void *MSVCRT___p__daylight(void)
 {
 	return &MSVCRT___daylight;
 }
+
+/*********************************************************************
+ *		_tzname (MSVCRT.@)
+ * NOTES
+ *  Some apps (notably Mozilla) insist on writing to these, so the buffer
+ *  must be large enough.  The size is picked based on observation of
+ *  Windows XP.
+ */
+static char tzname_std[64] = ""; /* FIXME: initialize */
+static char tzname_dst[64] = ""; /* FIXME: initialize */
+char *MSVCRT__tzname[2] = { tzname_std, tzname_dst };
+
+/*********************************************************************
+ *		__p_tzname (MSVCRT.@)
+ */
+char **__p__tzname(void)
+{
+	return MSVCRT__tzname;
+}