menu_driver

- command processor for the menus subsystem

Synopsis

cc [ flag... ] file... -lmenu -lcurses [ library... ]
#include <menu.h>

int menu_driver(MENU *menu, int c);

Description

menu_driver() is the workhorse of the menus subsystem. It checks to determine whether the character c is a menu request or data. If c is a request, the menu driver executes the request and reports the result. If c is data (a printable ASCII character), it enters the data into the pattern buffer and tries to find a matching item. If no match is found, the menu driver deletes the character from the pattern buffer and returns E_NO_MATCH. If the character is not recognized, the menu driver assumes it is an application-defined command and returns E_UNKNOWN_COMMAND.

Menu driver requests:

REQ_LEFT_ITEM

Move left to an item.

REQ_RIGHT_ITEM

Move right to an item

REQ_UP_ITEM

Move up to an item.

REQ_DOWN_ITEM

Move down to an item.

REQ_SCR_ULINE

Scroll up a line.

REQ_SCR_DLINE

Scroll down a line.

REQ_SCR_DPAGE

Scroll up a page.

REQ_SCR_UPAGE

Scroll down a page.

REQ_FIRST_ITEM

Move to the first item.

REQ_LAST_ITEM

Move to the last item.

REQ_NEXT_ITEM

Move to the next item.

REQ_PREV_ITEM

Move to the previous item.

REQ_TOGGLE_ITEM

Select/de-select an item.

REQ_CLEAR_PATTERN

Clear the menu pattern buffer.

REQ_BACK_PATTERN

Delete the previous character from pattern buffer.

REQ_NEXT_MATCH

Move the next matching item.

REQ_PREV_MATCH

Move to the previous matching item.

Return Values

menu_driver() returns one of the following:

E_OK

The routine returned successfully.

E_SYSTEM_ERROR

System error.

E_BAD_ARGUMENT

An incorrect argument was passed to the routine.

E_BAD_STATE

The routine was called from an initialization or termination function.

E_NOT_POSTED

The menu has not been posted.

E_UNKNOWN_COMMAND

An unknown request was passed to the menu driver.

E_NO_MATCH

The character failed to match.

E_NOT_SELECTABLE

The item cannot be selected.

E_REQUEST_DENIED

The menu driver could not process the request.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

curses(3CURSES), menus(3CURSES), attributes(5)

Notes

Application-defined commands should be defined relative to (greater than) MAX_COMMAND, the maximum value of a request listed above.

The header <menu.h> automatically includes the headers <eti.h> and <curses.h>.