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 Copyright 1989 AT&T
 Portions Copyright (c) 1996, Sun Microsystems, Inc. All Rights Reserved.
 The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
 You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
 When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
 MENU_DRIVER 3CURSES "Dec 31, 1996"
 NAME
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(7) for descriptions of the following attributes:






ATTRIBUTE TYPE ATTRIBUTE VALUE
MT-Level Unsafe



 SEE ALSO

 curses (3CURSES),  menus (3CURSES),  attributes (7) 
 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>.