cc [ flag... ] file... -lmenu -lcurses [ library... ] #include <menu.h>
int menu_driver(MENU *menu, int c);
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.
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.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | Unsafe |
curses(3CURSES), menus(3CURSES), attributes(5)
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>.