Fix to 47409 -

Don't use timezone comment in javascript Date object toString string if it looks like it might not be ASCII.

a,r=beard

js/src/jsdate.c

@@ -1497,6 +1497,8 @@ date_format(JSContext *cx, jsdouble date, jsval *rval)
     char buf[100];
     JSString *str;
     char tzbuf[100];
+    JSBool usetz;
+    uintN i, tzlen;
     PRMJTime split;
 
     if (!JSDOUBLE_IS_FINITE(date)) {
@@ -1526,6 +1528,29 @@ date_format(JSContext *cx, jsdouble date, jsval *rval)
 	new_explode(date, &split, JS_TRUE);
 	PRMJ_FormatTime(tzbuf, sizeof tzbuf, "(%Z) ", &split);
 
+        /* Decide whether to use the resulting timezone string.
+         *
+         * Reject it if it contains any non-ASCII, non-alphanumeric characters.
+         * It's then likely in some other character encoding, and we probably
+         * won't display it correctly.
+         */
+        usetz = JS_TRUE;
+        tzlen = strlen(tzbuf);
+        if (tzlen > 100) {
+            usetz = JS_FALSE;
+        } else {
+            for (i = 0; i < tzlen; i++) {
+                jschar c = tzbuf[i];
+                if (c > 127 || !(isalpha(c) || isdigit(c) ||
+                      c == ' ' || c == '(' || c == ')'))
+                    usetz = JS_FALSE;
+            }
+        }
+        
+        /* Also reject it if it's not parenthesized or if it's '()'. */
+        if (tzbuf[0] != '(' || tzbuf[1] == ')')
+            usetz = JS_FALSE;
+
 	/* Avoid dependence on PRMJ_FormatTimeUSEnglish, because it
 	 * requires a PRMJTime... which only has 16-bit years.  Sub-ECMA.
 	 */
@@ -1537,12 +1562,7 @@ date_format(JSContext *cx, jsdouble date, jsval *rval)
 		    MinFromTime(local),
 		    SecFromTime(local),
 		    offset,
-
-		    /* don't print anything for the TZA comment if we got '()'
-		     * or something non-parenthesized from the OS.
-		     */
-		    ((tzbuf[0] == '(' && tzbuf[1] != ')') ? tzbuf : ""),
-
+                    usetz ? tzbuf : "",
 		    YearFromTime(local));
     }