Provided by: ncurses-doc_6.5-2_all 
NAME
set_menu_mark, 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(3)).
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.
SEE ALSO
ncurses(3NCURSES), menu(3MENU)