display.c

android-w.song.android.widget

  if (col_lendiff > 0)	/* XXX - was lendiff */
    {
      /* Non-zero if we're increasing the number of lines. */
      int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
      /* If col_lendiff is > 0, implying that the new string takes up more
	 screen real estate than the old, but lendiff is < 0, meaning that it
	 takes fewer bytes, we need to just output the characters starting
	 from the first difference.  These will overwrite what is on the
	 display, so there's no reason to do a smart update.  This can really
	 only happen in a multibyte environment. */
      if (lendiff < 0)
	{
	  _rl_output_some_chars (nfd, temp);
	  _rl_last_c_pos += _rl_col_width (nfd, 0, temp, 1);
	  /* If nfd begins before any invisible characters in the prompt,
	     adjust _rl_last_c_pos to account for wrap_offset and set
	     cpos_adjusted to let the caller know. */
	  if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
	    {
	      _rl_last_c_pos -= wrap_offset;
	      cpos_adjusted = 1;
	    }
	  return;
	}
      /* Sometimes it is cheaper to print the characters rather than
	 use the terminal's capabilities.  If we're growing the number
	 of lines, make sure we actually cause the new line to wrap
	 around on auto-wrapping terminals. */
      else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
	{
	  /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
	     _rl_horizontal_scroll_mode == 1, inserting the characters with
	     _rl_term_IC or _rl_term_ic will screw up the screen because of the
	     invisible characters.  We need to just draw them. */
	  /* The same thing happens if we're trying to draw before the last
	     invisible character in the prompt string or we're increasing the
	     number of invisible characters in the line and we're not drawing
	     the entire prompt string. */
	  if (*ols && ((_rl_horizontal_scroll_mode &&
			_rl_last_c_pos == 0 &&
			lendiff > prompt_visible_length &&
			current_invis_chars > 0) == 0) &&
		      (((MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
		        current_line == 0 && wrap_offset &&
		        ((nfd - new) <= prompt_last_invisible) &&
		        (col_lendiff < prompt_visible_length)) == 0) &&
		      (visible_wrap_offset >= current_invis_chars))
	    {
	      insert_some_chars (nfd, lendiff, col_lendiff);
	      _rl_last_c_pos += col_lendiff;
	    }
#if 0		/* XXX - for now */
	  else if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && _rl_last_c_pos == 0 && wrap_offset && (nfd-new) <= prompt_last_invisible && col_lendiff < prompt_visible_length && visible_wrap_offset >= current_invis_chars)
	    {
	      _rl_output_some_chars (nfd, lendiff);
	      _rl_last_c_pos += col_lendiff;
	    }
#endif
	  else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
	    {
	      /* At the end of a line the characters do not have to
		 be "inserted".  They can just be placed on the screen. */
	      /* However, this screws up the rest of this block, which
		 assumes you've done the insert because you can. */
	      _rl_output_some_chars (nfd, lendiff);
	      _rl_last_c_pos += col_lendiff;
	    }
	  else
	    {
	      _rl_output_some_chars (nfd, temp);
	      _rl_last_c_pos += col_temp;
	      /* If nfd begins before the last invisible character in the
		 prompt, adjust _rl_last_c_pos to account for wrap_offset
		 and set cpos_adjusted to let the caller know. */
	      if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
		{
		  _rl_last_c_pos -= wrap_offset;
		  cpos_adjusted = 1;
		}
	      return;
	    }
	  /* Copy (new) chars to screen from first diff to last match. */
	  temp = nls - nfd;
	  if ((temp - lendiff) > 0)
	    {
	      _rl_output_some_chars (nfd + lendiff, temp - lendiff);
	     /* XXX -- this bears closer inspection.  Fixes a redisplay bug
		reported against bash-3.0-alpha by Andreas Schwab involving
		multibyte characters and prompt strings with invisible
		characters, but was previously disabled. */
	      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
		twidth = _rl_col_width (nfd+lendiff, 0, temp-col_lendiff, 1);
	      else
		twidth = temp - lendiff;
	      _rl_last_c_pos += twidth;
	      /* If nfd begins before the last invisible character in the
		 prompt, adjust _rl_last_c_pos to account for wrap_offset
		 and set cpos_adjusted to let the caller know. */
	      if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
		{
		  _rl_last_c_pos -= wrap_offset;
		  cpos_adjusted = 1;
		}
	    }
	}
      else
	{
	  /* cannot insert chars, write to EOL */
	  _rl_output_some_chars (nfd, temp);
	  _rl_last_c_pos += col_temp;
	  /* If we're in a multibyte locale and were before the last invisible
	     char in the current line (which implies we just output some invisible
	     characters) we need to adjust _rl_last_c_pos, since it represents
	     a physical character position. */
	  if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
		current_line == prompt_last_screen_line && wrap_offset &&
		wrap_offset != prompt_invis_chars_first_line &&
		((nfd-new) < (prompt_last_invisible-(current_line*_rl_screenwidth))))
	    {
	      _rl_last_c_pos -= wrap_offset - prompt_invis_chars_first_line;
	      cpos_adjusted = 1;
	    }
	}
    }
  else				/* Delete characters from line. */
    {
      /* If possible and inexpensive to use terminal deletion, then do so. */
      if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
	{
	  /* If all we're doing is erasing the invisible characters in the
	     prompt string, don't bother.  It screws up the assumptions
	     about what's on the screen. */
	  if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
	      -lendiff == visible_wrap_offset)
	    col_lendiff = 0;

	  if (col_lendiff)
	    delete_chars (-col_lendiff); /* delete (diff) characters */

	  /* Copy (new) chars to screen from first diff to last match */
	  temp = nls - nfd;
	  if (temp > 0)
	    {
	      /* If nfd begins at the prompt, or before the invisible
		 characters in the prompt, we need to adjust _rl_last_c_pos
		 in a multibyte locale to account for the wrap offset and
		 set cpos_adjusted accordingly. */
	      _rl_output_some_chars (nfd, temp);
	      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
		{
		  _rl_last_c_pos += _rl_col_width (nfd, 0, temp, 1);
		  if (current_line == 0 && wrap_offset &&  ((nfd - new) <= prompt_last_invisible))
		    {
		      _rl_last_c_pos -= wrap_offset;
		      cpos_adjusted = 1;
		    }
		}
	      else
		_rl_last_c_pos += temp;
	    }
	}
      /* Otherwise, print over the existing material. */
      else
	{
	  if (temp > 0)
	    {
	      /* If nfd begins at the prompt, or before the invisible
		 characters in the prompt, we need to adjust _rl_last_c_pos
		 in a multibyte locale to account for the wrap offset and
		 set cpos_adjusted accordingly. */
	      _rl_output_some_chars (nfd, temp);
	      _rl_last_c_pos += col_temp;		/* XXX */
	      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
		{
		  if (current_line == 0 && wrap_offset &&  ((nfd - new) <= prompt_last_invisible))
		    {
		      _rl_last_c_pos -= wrap_offset;
		      cpos_adjusted = 1;
		    }
		}
	    }
	  lendiff = (oe - old) - (ne - new);
	  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	    col_lendiff = _rl_col_width (old, 0, oe - old, 1) - _rl_col_width (new, 0, ne - new, 1);
	  else
	    col_lendiff = lendiff;

#if 0
	  if (col_lendiff)
#else
	  /* If we've already printed over the entire width of the screen,
	     including the old material, then col_lendiff doesn't matter and
	     space_to_eol will insert too many spaces.  XXX - maybe we should
	     adjust col_lendiff based on the difference between _rl_last_c_pos
	     and _rl_screenwidth */
	  if (col_lendiff && ((MB_CUR_MAX == 1 || rl_byte_oriented) || (_rl_last_c_pos < _rl_screenwidth)))
#endif
	    {	  
	      if (_rl_term_autowrap && current_line < inv_botlin)
		space_to_eol (col_lendiff);
	      else
		_rl_clear_to_eol (col_lendiff);
	    }
	}
    }
}

/* Tell the update routines that we have moved onto a new (empty) line. */
int
rl_on_new_line ()
{
  if (visible_line)
    visible_line[0] = '\0';

  _rl_last_c_pos = _rl_last_v_pos = 0;
  _rl_vis_botlin = last_lmargin = 0;
  if (vis_lbreaks)
    vis_lbreaks[0] = vis_lbreaks[1] = 0;
  visible_wrap_offset = 0;
  return 0;
}

/* Tell the update routines that we have moved onto a new line with the
   prompt already displayed.  Code originally from the version of readline
   distributed with CLISP.  rl_expand_prompt must have already been called
   (explicitly or implicitly).  This still doesn't work exactly right. */
int
rl_on_new_line_with_prompt ()
{
  int prompt_size, i, l, real_screenwidth, newlines;
  char *prompt_last_line, *lprompt;

  /* Initialize visible_line and invisible_line to ensure that they can hold
     the already-displayed prompt. */
  prompt_size = strlen (rl_prompt) + 1;
  init_line_structures (prompt_size);

  /* Make sure the line structures hold the already-displayed prompt for
     redisplay. */
  lprompt = local_prompt ? local_prompt : rl_prompt;
  strcpy (visible_line, lprompt);
  strcpy (invisible_line, lprompt);

  /* If the prompt contains newlines, take the last tail. */
  prompt_last_line = strrchr (rl_prompt, '\n');
  if (!prompt_last_line)
    prompt_last_line = rl_prompt;

  l = strlen (prompt_last_line);
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l, 1);	/* XXX */
  else
    _rl_last_c_pos = l;

  /* Dissect prompt_last_line into screen lines. Note that here we have
     to use the real screenwidth. Readline's notion of screenwidth might be
     one less, see terminal.c. */
  real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
  _rl_last_v_pos = l / real_screenwidth;
  /* If the prompt length is a multiple of real_screenwidth, we don't know
     whether the cursor is at the end of the last line, or already at the
     beginning of the next line. Output a newline just to be safe. */
  if (l > 0 && (l % real_screenwidth) == 0)
    _rl_output_some_chars ("\n", 1);
  last_lmargin = 0;

  newlines = 0; i = 0;
  while (i <= l)
    {
      _rl_vis_botlin = newlines;
      vis_lbreaks[newlines++] = i;
      i += real_screenwidth;
    }
  vis_lbreaks[newlines] = l;
  visible_wrap_offset = 0;

  rl_display_prompt = rl_prompt;	/* XXX - make sure it's set */

  return 0;
}

/* Actually update the display, period. */
int
rl_forced_update_display ()
{
  register char *temp;

  if (visible_line)
    {
      temp = visible_line;
      while (*temp)
	*temp++ = '\0';
    }
  rl_on_new_line ();
  forced_display++;
  (*rl_redisplay_function) ();
  return 0;
}

/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
   (Well, when we don't have multibyte characters, _rl_last_c_pos is a
   buffer index.)
   DATA is the contents of the screen line of interest; i.e., where
   the movement is being done. */
void
_rl_move_cursor_relative (new, data)
     int new;
     const char *data;
{
  register int i;
  int woff;			/* number of invisible chars on current line */
  int cpos, dpos;		/* current and desired cursor positions */
  int adjust;

  woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset);
  cpos = _rl_last_c_pos;

  if (cpos == 0 && cpos == new)
    return;

#if defined (HANDLE_MULTIBYTE)
  /* If we have multibyte characters, NEW is indexed by the buffer point in
     a multibyte string, but _rl_last_c_pos is the display position.  In
     this case, NEW's display position is not obvious and must be
     calculated.  We need to account for invisible characters in this line,
     as long as we are past them and they are counted by _rl_col_width. */
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    {
      adjust = 1;
      /* Try to short-circuit common cases and eliminate a bunch of multibyte
	 character function calls. */
      /* 1.  prompt string */
      if (new == local_prompt_len && memcmp (data, local_prompt, new) == 0)
	{
	  dpos = prompt_physical_chars;
	  cpos_adjusted = 1;
	  adjust = 0;
	}
      /* 2.  prompt_string + line contents */
      else if (new > local_prompt_len && local_prompt && memcmp (data, local_prompt, local_prompt_len) == 0)
	{
	  dpos = prompt_physical_chars + _rl_col_width (data, local_prompt_len, new, 1);
	  cpos_adjusted = 1;
	  adjust = 0;
	}
      else
        dpos = _rl_col_width (data, 0, new, 1);

      /* Use NEW when comparing against the last invisible character in the
	 prompt string, since they're both buffer indices and DPOS is a
	 desired display position. */
      if (adjust && ((new > prompt_last_invisible) ||		/* XXX - don't use woff here */
	  (prompt_physical_chars >= _rl_screenwidth &&
	   _rl_last_v_pos == prompt_last_screen_line &&
	   wrap_offset >= woff && dpos >= woff &&
	   new > (prompt_last_invisible-(_rl_screenwidth*_rl_last_v_pos)-wrap_offset))))
	   /* XXX last comparison might need to be >= */
	{
	  dpos -= woff;
	  /* Since this will be assigned to _rl_last_c_pos at the end (more
	     precisely, _rl_last_c_pos == dpos when this function returns),
	     let the caller know. */
	  cpos_adjusted = 1;
	}
    }
  else
#endif
    dpos = new;

  /* If we don't have to do anything, then return. */
  if (cpos == dpos)
    return;

  /* It may be faster to output a CR, and then move forwards instead
     of moving backwards. */
  /* i == current physical cursor position. */
#if defined (HANDLE_MULTIBYTE)
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    i = _rl_last_c_pos;
  else
#endif
  i = _rl_last_c_pos - woff;
  if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
      (_rl_term_autowrap && i == _rl_screenwidth))
    {
#if defined (__MSDOS__)
      putc ('\r', rl_outstream);
#else
      tputs (_rl_term_cr, 1, _rl_output_character_function);
#endif /* !__MSDOS__ */
      cpos = _rl_last_c_pos = 0;
    }

  if (cpos < dpos)
    {
      /* Move the cursor forward.  We do it by printing the command
	 to move the cursor forward if the