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
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).
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.
Routine detected an incorrect or out-of-range argument.
System error occurred (see errno(3)).
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