/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2002,2003,2005,2007,2008,2009  Free Software Foundation, Inc.
 *
 *  GRUB 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.
 *
 *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

/* The amount of lines counted by the pager.  */
static int grub_more_lines;

/* If the more pager is active.  */
static int grub_more;

static void
process_newline (void)
{
  if (code == '\n')
    {
      grub_putcode ('\r');

      grub_more_lines++;

      if (grub_more && grub_more_lines == height - 1)
	{
	  char key;
	  int pos = term->getxy ();

	  /* Show --MORE-- on the lower left side of the screen.  */
	  term->gotoxy (1, height - 1);
	  grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
	  grub_printf ("--MORE--");
	  grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);

	  key = grub_getkey ();

	  /* Remove the message.  */
	  term->gotoxy (1, height - 1);
	  grub_printf ("        ");
	  term->gotoxy (pos >> 8, pos & 0xFF);

	  /* Scroll one lines or an entire page, depending on the key.  */
	  if (key == '\r' || key =='\n')
	    grub_more_lines--;
	  else
	    grub_more_lines = 0;
	}
    }
}

void
grub_set_more (int onoff)
{
  if (onoff == 1)
    grub_more++;
  else
    grub_more--;

  grub_more_lines = 0;
}

void
grub_puts_terminal (const char *str, struct grub_term_output *term)
{
  grub_uint32_t code;
  grub_ssize_t ret;
  const char *ptr = str;
  unsigned i;

  while (*ptr)
    {
      ret = grub_utf8_to_ucs4 (&code, 1, ptr,
			       grub_strlen (ptr), &ptr);
      if (ret < 0)
	{
	  grub_putcode ('?', term);
	  ptr++;
	  continue;
	}
      else
	grub_putcode (code, term);	
    }
}

grub_uint16_t *
grub_term_save_pos (void)
{
  struct grub_term_output *cur;
  unsigned cnt = 0;
  grub_uint16_t *ret, *ptr;
  
  for (cur = grub_term_outputs; cur; cur = cur->next)
    if (cur->flags & GRUB_TERM_ACTIVE)
      cnt++;

  ret = grub_malloc (cnt * sizeof (ret[0]));
  if (!ret)
    return NULL;

  for (cur = grub_term_outputs; cur; cur = cur->next)
    if (cur->flags & GRUB_TERM_ACTIVE)
      *ptr++ = cur->getxy ();

  return ret;
}

void
grub_term_restore_pos (grub_uint16_t *pos)
{
  struct grub_term_output *cur;

  if (!pos)
    return;

  for (cur = grub_term_outputs; cur; cur = cur->next)
    if (cur->flags & GRUB_TERM_ACTIVE)
      cur->gotoxy ((*ptr & 0xff00) >> 8, *ptr & 0xff);
}