/* Console virtuelle */
/* 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 "vc_struct.h"
#include "vt.h"
#include "tty.h"
#include "video_driver.h"
#include "tty_queue.h"

#include <verify_area.h>
#include <segment.h>
#include <errno.h>
#include <enums.h>
#include <util.h>

/* valeurs par defaut */
#define INTR    0003
#define QUIT    0034
#define ERASE   0177
#define KILL    0025
#define EOF     0004
#define TIME    0
#define MIN     1
#define START   0021
#define STOP    0023
#define SUSP    0032
#define EOL     0000

/* Fonctions virtuelles de tty */

void vc_tty_do_output(struct tty_struct *tty, struct tty_queue_struct *tty_queue)
{
  struct vc_struct *vc;

  vc = downcast(struct vc_struct, tty, tty);
  if (!tty_queue_is_empty(&vc->tty.output_queue)) {
    vc->vt.driver->history_cancel();
    vt_write(&vc->vt, &vc->tty.output_queue, &vc->tty);
  }
}

void vc_tty_do_stop(struct tty_struct *tty)
{
  struct vc_struct *vc;

  vc = downcast(struct vc_struct, tty, tty);
  vc->lockstate |= SCROLL_LOCK;
  vc->vptr->do_stopped_changed(vc);
}

void vc_tty_do_start(struct tty_struct *tty)
{
  struct vc_struct *vc;

  vc = downcast(struct vc_struct, tty, tty);
  vc->lockstate &= ~SCROLL_LOCK;
  vc->vptr->do_stopped_changed(vc);
}

int vc_tty_do_ioctl(struct tty_struct *tty, int request, void *fs_arg)
{
  struct vc_struct *vc;

  vc = downcast(struct vc_struct, tty, tty);
  switch (request) {
  case TGETWSZ:
    if (!verify_area(fs_arg, sizeof (struct winsize_struct), PF_WRITE))
      return -EFAULT;
    put_fs_word(vc->vt.driver->get_lines(), (short *)&((struct winsize_struct *)fs_arg)->height);
    put_fs_word(vc->vt.driver->get_columns(), (short *)&((struct winsize_struct *)fs_arg)->width);
    return 0;
  case TGETCT:
    if (!verify_area(fs_arg, sizeof (int), PF_WRITE))
      return -EFAULT;
    put_fs_long(vc->vt.driver->get_cursor_type(), fs_arg);
    return 0;
  case TSETCT:
    if (!verify_area(fs_arg, sizeof (int), PF_READ))
      return -EFAULT;
    vc->vt.driver->set_cursor_type(get_fs_long(fs_arg));
    return 0;
  default:
    return tty_do_ioctl(&vc->tty, request, fs_arg);
  }
}

/* Fonctions sur les consoles virtuelles */

void vc_init(struct vc_struct *vc, unsigned short line, unsigned short col)
{
  unsigned long iflags;
  unsigned long oflags;
  unsigned long lflags;
  unsigned char cc[NCCS];

  /* positionnement des drapeaux aux valeurs par defaut pour une console virtuelle */
  iflags = ICRNL | IXON;
  oflags = OPOST | ONLCR;
  lflags = ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | ICANON | ISIG;
  cc[VINTR] = INTR;
  cc[VQUIT] = QUIT;
  cc[VERASE] = ERASE;
  cc[VKILL] = KILL;
  cc[VEOF] = EOF;
  cc[VTIME] = TIME;
  cc[VMIN] = MIN;
  cc[VSTART] = START;
  cc[VSTOP] = STOP;
  cc[VSUSP] = SUSP;
  cc[VEOL] = EOL;
  tty_init(&vc->tty, iflags, oflags, lflags, cc, col);

  vt_init(&vc->vt, line, col);

  /* initialisation de vc->modifiers a la charge du pilote de clavier */
  vc->lockstate = 0; /* valeur par defaut */
}

void vc_history_up(const struct vc_struct *vc)
{
  vc->vt.driver->history_scroll(1);
}

void vc_history_down(const struct vc_struct *vc)
{
  vc->vt.driver->history_scroll(-1);
}

void vc_history_pgup(const struct vc_struct *vc)
{
  vc->vt.driver->history_scroll(vc->vt.driver->get_lines() / 2);
}

void vc_history_pgdn(const struct vc_struct *vc)
{
  vc->vt.driver->history_scroll(-(vc->vt.driver->get_lines() / 2));
}

void vc_history_cancel(const struct vc_struct *vc)
{
  vc->vt.driver->history_cancel();
}