Every menu has an associated pattern match buffer. As input events
that are printable characters come in, they are appended to this
match buffer and tested for a match, as described in menu_driver(3X).
The function set_menu_pattern sets the pattern buffer for the given
menu and tries to find the first matching item. If it succeeds, that
item becomes current; if not, the current item does not change.
The function menu_pattern returns the pattern buffer of the given
The function menu_pattern returns a pointer, which is NULL if the
menu parameter is NULL. Otherwise, it is a pointer to a string which
is empty if no pattern has been set. It does not set errno.
The function set_menu_pattern may return the following error codes:
E_OK The routine succeeded.
Routine detected an incorrect or out-of-range argument.
Routine was called from an initialization or termination
No items are connected to menu.
Character failed to match.
System error occurred (see errno).
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