From e7522695a57b3fa8bc212d6b46fe13a2ba11f001 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Thu, 14 Dec 2000 15:12:58 +0000
Subject: [PATCH] (Fmsdos_set_mouse_buttons): Signal an error if the argument
 is outside the range [2..3].

---
 src/msdos.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/msdos.c b/src/msdos.c
index 85ff6dd94a6..1c4e8409ed8 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -195,8 +195,15 @@ them.  This happens with wheeled mice on Windows 9X, for example.")
   (nbuttons)
      Lisp_Object nbuttons;
 {
+  int n;
+
   CHECK_NUMBER (nbuttons, 0);
-  mouse_setup_buttons (XINT (nbuttons));
+  n = XINT (nbuttons);
+  if (n < 2 || n > 3)
+    Fsignal (Qargs_out_of_range,
+	     Fcons (build_string ("only 2 or 3 mouse buttons are supported"),
+		    Fcons (nbuttons, Qnil)));
+  mouse_setup_buttons (n);
   return Qnil;
 }
 
-- 
2.39.2