#include <menu.h>
int set_menu_mark(MENU *menu, const char *mark);
const char *menu_mark(const MENU *menu);
DESCRIPTION
In order to make menu selections visible on older terminals without
highlighting or color capability, the menu library marks selected items
in a menu with a prefix string.
The function set_menu_mark sets the mark string for the given menu.
Calling set_menu_mark with a null menu item will abolish the mark string.
Note that changing the length of the mark string for a menu while the
menu is posted is likely to produce unhelpful behavior.
The default string is "-" (a dash). Calling set_menu_mark with
a non-NULL menu argument will change this default.
The function menu_mark returns the menu's mark string (or NULL if
there is none).
RETURN VALUE
The function menu_mark returns a pointer (which may be NULL).
It does not set errno.
The function set_menu_mark may return the following error codes:
E_OK
The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
