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 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 NULL on error. The function set_menu_mark may return the following error codes:
