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MENU_DRIVER(3)		 BSD 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 immedi‐
			ately 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 pat‐
			tern 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>.

BSD			      September 10, 1999			   BSD

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