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MENU_DRIVER(3)             Library Functions Manual             MENU_DRIVER(3)

NAME
     menu_driver - main menu handling function

LIBRARY
     Curses Menu Library (libmenu, -lmenu)

SYNOPSIS
     #include <menu.h>

     int
     menu_driver(MENU *menu, int c);

DESCRIPTION
     The menu_driver() function is the guts of the menu system.  It takes the
     commands passed by c parameter and performs the requested action on the
     menu given.  The following commands may be given to the menu driver:

     Command            Action
     REQ_LEFT_ITEM      Sets the new current item to be the item to the left
                        of the current item.
     REQ_RIGHT_ITEM     Sets the new current item to be the item to the rights
                        of the current item.
     REQ_UP_ITEM        Sets the new current item to be the item above the
                        current item.
     REQ_DOWN_ITEM      Sets the new current item to be the item below the
                        current item.
     REQ_SCR_ULINE      Scroll the menu one line towards the bottom of the
                        menu window.  The new current item becomes the item
                        immediately above the current item.
     REQ_SCR_DLINE      Scroll the menu one line towards the top of the menu
                        window.  The new current item becomes the item
                        immediately below the current item.
     REQ_SCR_DPAGE      Scroll the menu one page towards the bottom of the
                        menu window.
     REQ_SCR_UPAGE      Scroll the menu one page towards the top of the menu
                        window.
     REQ_FIRST_ITEM     Set the current item to be the first item in the menu.
     REQ_LAST_ITEM      Set the current item to be the last item in the menu.
     REQ_NEXT_ITEM      Set the new current item to be the next item in the
                        item array after the current item.
     REQ_PREV_ITEM      Set the new current item to be the item before the
                        current item in the items array.
     REQ_TOGGLE_ITEM    If the item is selectable then toggle the item's
                        value.
     REQ_CLEAR_PATTERN  Clear all the characters currently in the menu's
                        pattern buffer.
     REQ_BACK_PATTERN   Remove the last character from the pattern buffer.
     REQ_NEXT_MATCH     Attempt to find the next item that matches the pattern
                        buffer.
     REQ_PREV_MATCH     Attempt to find the previous item that matches the
                        pattern buffer.
     If menu_driver() is passed a command that is greater than MAX_COMMAND
     then the command passed is assumed to be a user defined command and
     menu_driver() returns E_UNKNOWN_COMMAND.  Otherwise if the command is a
     printable character then the character represented by the command is
     placed at the end of the pattern buffer and an attempt is made to match
     the pattern buffer against the items in the menu.

RETURN VALUES
     The functions return one of the following error values:

     E_OK               The function was successful.
     E_SYSTEM_ERROR     There was a system error during the call.
     E_BAD_ARGUMENT     One or more of the arguments passed to the function
                        was incorrect.
     E_NOT_POSTED       The menu is not posted.
     E_UNKNOWN_COMMAND  The menu driver does not recognize the request passed
                        to it.
     E_NO_MATCH         The character search failed to find a match.
     E_NOT_CONNECTED    The item is not connected to a menu.
     E_REQUEST_DENIED   The menu driver could not process the request.

SEE ALSO
     curses(3), menus(3)

NOTES
     The header <menu.h> automatically includes both <curses.h> and <eti.h>.

NetBSD 10.99                  September 10, 1999                  NetBSD 10.99