lineconsole.c

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/*
 * Copyright (C) 2012 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
 *
 * Line-based console
 *
 */
 
#include <stdint.h>
#include <stddef.h>
#include <ipxe/ansiesc.h>
#include <ipxe/lineconsole.h>
 
/**
 * Print a character to a line-based console
 *
 * @v character         Character to be printed
 * @ret print           Print line
 */
size_t line_putchar ( struct line_console *line, int character ) {
 
        /* Strip ANSI escape sequences */
        character = ansiesc_process ( &line->ctx, character );
        if ( character < 0 )
                return 0;
 
        /* Handle backspace characters */
        if ( character == '\b' ) {
                if ( line->index )
                        line->index--;
                return 0;
        }
 
        /* Ignore carriage return */
        if ( character == '\r' )
                return 0;
 
        /* Treat newline as a terminator */
        if ( character == '\n' )
                character = 0;
 
        /* Add character to buffer */
        line->buffer[line->index++] = character;
 
        /* Do nothing more unless we reach end-of-line (or end-of-buffer) */
        if ( ( character != 0 ) &&
             ( line->index < ( line->len - 1 /* NUL */ ) ) ) {
                return 0;
        }
 
        /* Reset to start of buffer */
        line->index = 0;
 
        return 1;
}