kconfig/lxdialog: let <ESC><ESC> behave as expected

[powerpc.git] / scripts / kconfig / lxdialog / util.c

diff --git a/scripts/kconfig/lxdialog/util.c b/scripts/kconfig/lxdialog/util.c
index 0b3118d..cb21dc4 100644 (file)
--- a/scripts/kconfig/lxdialog/util.c
+++ b/scripts/kconfig/lxdialog/util.c
@@ -477,6 +477,39 @@ int first_alpha(const char *string, const char *exempt)
        return 0;
 }
 
+/*
+ * ncurses uses ESC to detect escaped char sequences. This resutl in
+ * a small timeout before ESC is actually delivered to the application.
+ * lxdialog suggest <ESC> <ESC> which is correctly translated to two
+ * times esc. But then we need to ignore the second esc to avoid stepping
+ * out one menu too much. Filter away all escaped key sequences since
+ * keypad(FALSE) turn off ncurses support for escape sequences - and thats
+ * needed to make notimeout() do as expected.
+ */
+int on_key_esc(WINDOW *win)
+{
+       int key;
+       int key2;
+       int key3;
+
+       nodelay(win, TRUE);
+       keypad(win, FALSE);
+       key = wgetch(win);
+       key2 = wgetch(win);
+       do {
+               key3 = wgetch(win);
+       } while (key3 != ERR);
+       nodelay(win, FALSE);
+       keypad(win, TRUE);
+       if (key == KEY_ESC && key2 == ERR)
+               return KEY_ESC;
+       else if (key != ERR && key != KEY_ESC && key2 == ERR)
+               ungetch(key);
+
+       return -1;
+}
+
+
 struct dialog_list *item_cur;
 struct dialog_list item_nil;
 struct dialog_list *item_head;