common, menu: add statusline support

add the possibility to show a statusline when printing a menu

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Jason Hobbs <jason.hobbs@calxeda.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>

common/menu.c

@@ -113,6 +113,13 @@ static inline void *menu_item_destroy(struct menu *m,
 	return NULL;
 }
 
+void __menu_display_statusline(struct menu *m)
+{
+	return;
+}
+void menu_display_statusline(struct menu *m)
+	__attribute__ ((weak, alias("__menu_display_statusline")));
+
 /*
  * Display a menu so the user can make a choice of an item. First display its
  * title, if any, and then each item in the menu.
@@ -123,6 +130,7 @@ static inline void menu_display(struct menu *m)
 		puts(m->title);
 		putc('\n');
 	}
+	menu_display_statusline(m);
 
 	menu_items_iter(m, menu_item_print, NULL);
 }

doc/README.menu

@@ -69,6 +69,11 @@ int menu_get_choice(struct menu *m, void **choice);
  */
 int menu_destroy(struct menu *m);
 
+/*
+ * menu_display_statusline(struct menu *m);
+ * shows a statusline for every menu_display call.
+ */
+void menu_display_statusline(struct menu *m);
 
 Example Code
 ------------

include/menu.h

@@ -26,5 +26,6 @@ int menu_default_set(struct menu *m, char *item_key);
 int menu_get_choice(struct menu *m, void **choice);
 int menu_item_add(struct menu *m, char *item_key, void *item_data);
 int menu_destroy(struct menu *m);
+void menu_display_statusline(struct menu *m);
 
 #endif /* __MENU_H__ */