aversive_10-03-12/modules/ihm/vt100/vt100.c

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/*  
 *  Copyright Droids Corporation (2007)
 *  Olivier MATZ <zer0@droids-corp.org>
 * 
 *  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
 *  (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Revision : $Id: vt100.c,v 1.2 2008-01-08 20:05:05 zer0 Exp $
 *
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>

#include <aversive/pgmspace.h>

#include "vt100.h"

static const prog_char cmd0[] = vt100_up_arr;
static const prog_char cmd1[] = vt100_down_arr;
static const prog_char cmd2[] = vt100_right_arr;
static const prog_char cmd3[] = vt100_left_arr;
static const prog_char cmd4[] = "\177";
static const prog_char cmd5[] = "\n";
static const prog_char cmd6[] = "\001";
static const prog_char cmd7[] = "\005";
static const prog_char cmd8[] = "\013";
static const prog_char cmd9[] = "\031";
static const prog_char cmd10[] = "\003";
static const prog_char cmd11[] = "\006";
static const prog_char cmd12[] = "\002";
static const prog_char cmd13[] = vt100_suppr;
static const prog_char cmd14[] = vt100_tab;
static const prog_char cmd15[] = "\004";
static const prog_char cmd16[] = "\014";
static const prog_char cmd17[] = "\r";
static const prog_char cmd18[] = "\033\177";
static const prog_char cmd19[] = vt100_word_left;
static const prog_char cmd20[] = vt100_word_right;
static const prog_char cmd21[] = "?";

const prog_char * vt100_commands[] PROGMEM = {
        cmd0, cmd1, cmd2, cmd3, cmd4, cmd5, cmd6, cmd7,
        cmd8, cmd9, cmd10, cmd11, cmd12, cmd13, cmd14,
        cmd15, cmd16, cmd17, cmd18, cmd19, cmd20,
        cmd21,
};

void
vt100_init(struct vt100 * vt)
{
        vt->state = VT100_INIT;
}


static int8_t
match_command(char * buf, uint8_t size)
{
        const prog_char * cmd;
        uint8_t i = 0;
        
        for (i=0 ; i<sizeof(vt100_commands)/sizeof(const prog_char *) ; i++) {
#ifdef HOST_VERSION
                cmd = *(vt100_commands + i);
#else
                cmd = (const prog_char *) pgm_read_word (vt100_commands + i);
#endif

                if (size == strlen_P(cmd) &&
                    !strncmp_P(buf, cmd, strlen_P(cmd))) {
                        return i;
                }
        }

        return -1;
}

int8_t
vt100_parser(struct vt100 *vt, char ch)
{
        uint8_t size;
        uint8_t c = (uint8_t) ch;

        if (vt->bufpos > VT100_BUF_SIZE) {
                vt->state = VT100_INIT;
                vt->bufpos = 0;
        }

        vt->buf[vt->bufpos++] = c;
        size = vt->bufpos;

        switch (vt->state) {
        case VT100_INIT:
                if (c == 033) {
                        vt->state = VT100_ESCAPE;
                }
                else {
                        vt->bufpos = 0;
                        goto match_command;
                }
                break;

        case VT100_ESCAPE:
                if (c == 0133) {
                        vt->state = VT100_ESCAPE_CSI;
                }
                else if (c >= 060 && c <= 0177) { /* XXX 0177 ? */
                        vt->bufpos = 0;
                        vt->state = VT100_INIT;
                        goto match_command;
                }
                break;

        case VT100_ESCAPE_CSI:
                if (c >= 0100 && c <= 0176) {
                        vt->bufpos = 0;
                        vt->state = VT100_INIT;
                        goto match_command;
                }
                break;
                
        default:
                vt->bufpos = 0;
                break;
        }

        return -2;
        
 match_command:
        return match_command(vt->buf, size);
}

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