prompt.c

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/*
 * Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );

/** @file
 *
 * Prompt for keypress
 *
 */

#include <errno.h>
#include <stdio.h>
#include <ipxe/console.h>
#include <usr/prompt.h>

/**
 * Prompt for keypress
 *
 * @v text              Prompt string
 * @v timeout           Timeout period, in ticks (0=indefinite)
 * @v key               Key to wait for (0=any key)
 * @ret rc              Return status code
 *
 * Returns success if the specified key was pressed within the
 * specified timeout period.
 */
int prompt ( const char *text, unsigned long timeout, int key ) {
        int key_pressed;

        /* Display prompt */
        printf ( "%s", text );

        /* Wait for key */
        key_pressed = getkey ( timeout );

        /* Clear the prompt line */
        while ( *(text++) )
                printf ( "\b \b" );

        /* Check for timeout */
        if ( key_pressed < 0 )
                return -ETIMEDOUT;

        /* Check for correct key pressed */
        if ( key && ( key_pressed != key ) )
                return -ECANCELED;

        return 0;
}