osx man page for set_menu_mark

menu_mark(3X)															     menu_mark(3X)

NAME
       menu_mark - get and set the menu mark string

SYNOPSIS
       #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.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

SEE ALSO
       curses(3X), menu(3X).

NOTES
       The header file <menu.h> automatically includes the header file <curses.h>.

PORTABILITY
       These routines emulate the System V menu library.  They were not supported on Version 7 or BSD versions.

AUTHORS
       Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S. Raymond.

																     menu_mark(3X)