The function set_menu_items changes the item pointer array of the
given menu. The array must be terminated by a NULL.
The function menu_items returns the item array of the given menu.
The function item_count returns the count of items in menu.
The function menu_items returns a pointer (which may be NULL).
It does not set errno.
The function item_count returns ERR (the general curses error
return value) if its menu parameter is NULL.
The function set_menu_items returns one of the following codes on
E_OK The routine succeeded.
Routine detected an incorrect or out-of-range argument.
No items are connected to the menu.
The menu is already posted.
System error occurred (see errno(3)).
These routines emulate the System V menu library. They were not
supported on Version 7 or BSD versions.
The SVr4 menu library documentation specifies the item_count
error value as -1 (which is the value of ERR).
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