menu_driver(3X)menu_driver(3X)NAMEmenu_driver - command-processing loop of the menu system
int menu_driver(MENU *menu, int c);
Once a menu has been posted (displayed), you should funnel input events
to it through menu_driver. This routine has two major input cases;
either the input is a menu navigation request or it's a printable ASCII
character. The menu driver requests are as follows:
Move left to an item.
Move right to an item.
Move up to an item.
Move down to an item.
Scroll up a line.
Scroll down a line.
Scroll down a page.
Scroll up a page.
Move to the first item.
Move to the last item.
Move to the next item.
Move to the previous item.
Select/deselect an item.
Clear the menu pattern buffer.
Delete the previous character from the pattern buffer.
Move to the next item matching the pattern match.
Move to the previous item matching the pattern match.
If the second argument is a printable ASCII character, the code appends
it to the pattern buffer and attempts to move to the next item matching
the new pattern. If there is no such match, menu_driver returns
E_NO_MATCH and deletes the appended character from the buffer.
If the second argument is one of the above pre-defined requests, the
corresponding action is performed.
If the second argument is neither printable ASCII nor one of the above
pre-defined menu requests, the drive assumes it is an application-spe‐
cific command and returns E_UNKNOWN_COMMAND. Application-defined com‐
mands should be defined relative to MAX_COMMAND, the maximum value of
these pre-defined requests.
RETURN VALUEmenu_driver return one of the following error codes:
E_OK The routine succeeded.
System error occurred (see errno).
Routine detected an incorrect or out-of-range argument.
Routine was called from an initialization or termination function.
The menu has not been posted.
The menu driver code saw an unknown request code.
Character failed to match.
The menu driver could not process the request.
SEE ALSOcurses(3X), menu(3X).
The header file <menu.h> automatically includes the header files
These routines emulate the System V menu library. They were not sup‐
ported on Version 7 or BSD versions.
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.