/* Configuration du terminal */
/* Copyright (C) 2008  Emmanuel Varoquaux

   This file is part of XOS.

   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 3 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, see <http://www.gnu.org/licenses/>. */

#include "tty.h"

#include <readline/rlvars.h>
#include <termios.h>

#define DEFAULT_TTY_INTR '\003' /* ^C */
#define DEFAULT_TTY_QUIT '\034' /* ^\ */
#define DEFAULT_TTY_SUSP '\032' /* ^Z */

static int tty;
static int tty_setup;
static struct termios saved_termios;

int tty_echo;
int tty_isig;
char tty_intr;
char tty_quit;
char tty_susp;

void setup_tty()
{
  struct termios termios;

  tty = fileno(rl_instream);
  tty_setup = 0;
  if (tcgetattr(tty, &saved_termios) == -1) {
    tty_echo = 0;
    tty_isig = 0;
    return;
  }
  tty_echo = saved_termios.c_lflag & ECHO;
  if ((tty_isig = saved_termios.c_lflag & ISIG)) {
    tty_intr = saved_termios.c_cc[VINTR];
    tty_quit = saved_termios.c_cc[VQUIT];
    tty_susp = saved_termios.c_cc[VSUSP];
  }
  else {
    /* valeurs par defaut */
    tty_isig = 1; /* simulation des signaux du clavier */
    tty_intr = DEFAULT_TTY_INTR;
    tty_quit = DEFAULT_TTY_QUIT;
    tty_susp = DEFAULT_TTY_SUSP;
  }
  termios = saved_termios;
  termios.c_iflag &= ~(ICRNL | INLCR);
  termios.c_lflag &= ~(ICANON | ECHO | ISIG);
  termios.c_cc[VMIN] = 1;
  termios.c_cc[VTIME] = 0;
  if (tcsetattr(tty, TCSADRAIN, &termios) == -1)
    return;
  tty_setup = 1;
}

void restore_tty()
{
  if (tty_setup)
    tcsetattr(tty, TCSADRAIN, &saved_termios);
}