xim: check for corner cases

dmenu.c

@@ -230,11 +230,13 @@ insert(const char *str, ssize_t n) {
 void
 keypress(XKeyEvent *ev) {
 	char buf[32];
-	KeySym ksym;
 	int len;
+	KeySym ksym = NoSymbol;
 	Status status;
 
-	len = XmbLookupString(xic, ev, buf, sizeof(buf), &ksym, &status);
+	len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);
+	if(status == XBufferOverflow)
+		return;
 	if(ev->state & ControlMask) {
 		KeySym lower, upper;