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

<ESC><ESC> is used to step one back in the dialogs.
When lxdialog became built-in pressing <ESC> once would cause one step back
and pressing <ESC><ESC> would cause two steps back.
This patch - based on concept from Roman Zippel <zippel@linux-m68k.org> -
makes one <ESC> a noop and pressing <ESC><ESC> will cause one step backward.

In addition the final yes/no dialog now has the option to go back to the
the kernel configuration. So if you get too far out you can now go back
to configuring the kernel without saving and starting all over again.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/kconfig/lxdialog/dialog.h b/scripts/kconfig/lxdialog/dialog.h
index 065ded0a449f..a7cfdecc2409 100644
--- a/scripts/kconfig/lxdialog/dialog.h
+++ b/scripts/kconfig/lxdialog/dialog.h
@@ -48,7 +48,7 @@
 
 #define TR(params) _tracef params
 
-#define ESC 27
+#define KEY_ESC 27
 #define TAB 9
 #define MAX_LEN 2048
 #define BUF_SIZE (10*1024)
@@ -179,6 +179,8 @@ int item_is_tag(char tag);
         for (item_cur = item_head ? item_head: item_cur; \
              item_cur && (item_cur != &item_nil); item_cur = item_cur->next)
 
+/* generic key handlers */
+int on_key_esc(WINDOW *win);
 
 void init_dialog(const char *backtitle);
 void reset_dialog(void);