display.c

android-w.song.android.widget

      if (rl_display_fixed == 0 || forced_display || lmargin != last_lmargin)
	{
	  forced_display = 0;
	  o_cpos = _rl_last_c_pos;
	  cpos_adjusted = 0;
	  update_line (&visible_line[last_lmargin],
		       &invisible_line[lmargin],
		       0,
		       _rl_screenwidth + visible_wrap_offset,
		       _rl_screenwidth + (lmargin ? 0 : wrap_offset),
		       0);

	  if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && OLD_CPOS_IN_PROMPT())
	    _rl_last_c_pos -= prompt_invis_chars_first_line;	/* XXX - was wrap_offset */

	  /* If the visible new line is shorter than the old, but the number
	     of invisible characters is greater, and we are at the end of
	     the new line, we need to clear to eol. */
	  t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
	  if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
	      (_rl_last_c_pos == out) &&
	      t < visible_first_line_len)
	    {
	      nleft = _rl_screenwidth - t;
	      _rl_clear_to_eol (nleft);
	    }
	  visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
	  if (visible_first_line_len > _rl_screenwidth)
	    visible_first_line_len = _rl_screenwidth;

	  _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]);
	  last_lmargin = lmargin;
	}
    }
  fflush (rl_outstream);

  /* Swap visible and non-visible lines. */
  {
    struct line_state *vtemp = line_state_visible;

    line_state_visible = line_state_invisible;
    line_state_invisible = vtemp;

    rl_display_fixed = 0;
    /* If we are displaying on a single line, and last_lmargin is > 0, we
       are not displaying any invisible characters, so set visible_wrap_offset
       to 0. */
    if (_rl_horizontal_scroll_mode && last_lmargin)
      visible_wrap_offset = 0;
    else
      visible_wrap_offset = wrap_offset;
  }

  RL_UNSETSTATE (RL_STATE_REDISPLAYING);
  _rl_release_sigint ();
}

/* PWP: update_line() is based on finding the middle difference of each
   line on the screen; vis:

			     /old first difference
	/beginning of line   |	      /old last same       /old EOL
	v		     v	      v		    v
old:	eddie> Oh, my little gruntle-buggy is to me, as lurgid as
new:	eddie> Oh, my little buggy says to me, as lurgid as
	^		     ^	^			   ^
	\beginning of line   |	\new last same	   \new end of line
			     \new first difference

   All are character pointers for the sake of speed.  Special cases for
   no differences, as well as for end of line additions must be handled.

   Could be made even smarter, but this works well enough */
static void
update_line (old, new, current_line, omax, nmax, inv_botlin)
     register char *old, *new;
     int current_line, omax, nmax, inv_botlin;
{
  register char *ofd, *ols, *oe, *nfd, *nls, *ne;
  int temp, lendiff, wsatend, od, nd, twidth, o_cpos;
  int current_invis_chars;
  int col_lendiff, col_temp;
#if defined (HANDLE_MULTIBYTE)
  mbstate_t ps_new, ps_old;
  int new_offset, old_offset;
#endif

  /* If we're at the right edge of a terminal that supports xn, we're
     ready to wrap around, so do so.  This fixes problems with knowing
     the exact cursor position and cut-and-paste with certain terminal
     emulators.  In this calculation, TEMP is the physical screen
     position of the cursor. */
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    temp = _rl_last_c_pos;
  else
    temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset);
  if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
	&& _rl_last_v_pos == current_line - 1)
    {
#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	{
	  wchar_t wc;
	  mbstate_t ps;
	  int tempwidth, bytes;
	  size_t ret;

	  /* This fixes only double-column characters, but if the wrapped
	     character comsumes more than three columns, spaces will be
	     inserted in the string buffer. */
	  if (current_line < line_state_visible->wbsize && line_state_visible->wrapped_line[current_line] > 0)
	    _rl_clear_to_eol (line_state_visible->wrapped_line[current_line]);

	  memset (&ps, 0, sizeof (mbstate_t));
	  ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
	  if (MB_INVALIDCH (ret))
	    {
	      tempwidth = 1;
	      ret = 1;
	    }
	  else if (MB_NULLWCH (ret))
	    tempwidth = 0;
	  else
	    tempwidth = wcwidth (wc);

	  if (tempwidth > 0)
	    {
	      int count, i;
	      bytes = ret;
	      for (count = 0; count < bytes; count++)
		putc (new[count], rl_outstream);
	      _rl_last_c_pos = tempwidth;
	      _rl_last_v_pos++;
	      memset (&ps, 0, sizeof (mbstate_t));
	      ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
	      if (ret != 0 && bytes != 0)
		{
		  if (MB_INVALIDCH (ret))
		    ret = 1;
		  memmove (old+bytes, old+ret, strlen (old+ret));
		  memcpy (old, new, bytes);
		  /* Fix up indices if we copy data from one line to another */
		  omax += bytes - ret;
		  for (i = current_line+1; i < inv_botlin+1; i++)
		    vis_lbreaks[i] += bytes - ret;
		}
	    }
	  else
	    {
	      putc (' ', rl_outstream);
	      _rl_last_c_pos = 1;
	      _rl_last_v_pos++;
	      if (old[0] && new[0])
		old[0] = new[0];
	    }
	}
      else
#endif
	{
	  if (new[0])
	    putc (new[0], rl_outstream);
	  else
	    putc (' ', rl_outstream);
	  _rl_last_c_pos = 1;
	  _rl_last_v_pos++;
	  if (old[0] && new[0])
	    old[0] = new[0];
	}
    }

      
  /* Find first difference. */
#if defined (HANDLE_MULTIBYTE)
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    {
      /* See if the old line is a subset of the new line, so that the
	 only change is adding characters. */
      temp = (omax < nmax) ? omax : nmax;
      if (memcmp (old, new, temp) == 0)		/* adding at the end */
	{
	  ofd = old + temp;
	  nfd = new + temp;
	}
      else
	{      
	  memset (&ps_new, 0, sizeof(mbstate_t));
	  memset (&ps_old, 0, sizeof(mbstate_t));

	  if (omax == nmax && STREQN (new, old, omax))
	    {
	      ofd = old + omax;
	      nfd = new + nmax;
	    }
	  else
	    {
	      new_offset = old_offset = 0;
	      for (ofd = old, nfd = new;
		    (ofd - old < omax) && *ofd &&
		    _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
		{
		  old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
		  new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
		  ofd = old + old_offset;
		  nfd = new + new_offset;
		}
	    }
	}
    }
  else
#endif
  for (ofd = old, nfd = new;
       (ofd - old < omax) && *ofd && (*ofd == *nfd);
       ofd++, nfd++)
    ;

  /* Move to the end of the screen line.  ND and OD are used to keep track
     of the distance between ne and new and oe and old, respectively, to
     move a subtraction out of each loop. */
  for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
  for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);

  /* If no difference, continue to next line. */
  if (ofd == oe && nfd == ne)
    return;

  wsatend = 1;			/* flag for trailing whitespace */

#if defined (HANDLE_MULTIBYTE)
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    {
      ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
      nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
      while ((ols > ofd) && (nls > nfd))
	{
	  memset (&ps_old, 0, sizeof (mbstate_t));
	  memset (&ps_new, 0, sizeof (mbstate_t));

#if 0
	  /* On advice from [e-mail] */
	  _rl_adjust_point (old, ols - old, &ps_old);
	  _rl_adjust_point (new, nls - new, &ps_new);
#endif

	  if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
	    break;

	  if (*ols == ' ')
	    wsatend = 0;

	  ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
	  nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
	}
    }
  else
    {
#endif /* HANDLE_MULTIBYTE */
  ols = oe - 1;			/* find last same */
  nls = ne - 1;
  while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
    {
      if (*ols != ' ')
	wsatend = 0;
      ols--;
      nls--;
    }
#if defined (HANDLE_MULTIBYTE)
    }
#endif

  if (wsatend)
    {
      ols = oe;
      nls = ne;
    }
#if defined (HANDLE_MULTIBYTE)
  /* This may not work for stateful encoding, but who cares?  To handle
     stateful encoding properly, we have to scan each string from the
     beginning and compare. */
  else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
#else
  else if (*ols != *nls)
#endif
    {
      if (*ols)			/* don't step past the NUL */
	{
	  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	    ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
	  else
	    ols++;
	}
      if (*nls)
	{
	  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	    nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
	  else
	    nls++;
	}
    }

  /* count of invisible characters in the current invisible line. */
  current_invis_chars = W_OFFSET (current_line, wrap_offset);
  if (_rl_last_v_pos != current_line)
    {
      _rl_move_vert (current_line);
      if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
	_rl_last_c_pos += visible_wrap_offset;
    }

  /* If this is the first line and there are invisible characters in the
     prompt string, and the prompt string has not changed, and the current
     cursor position is before the last invisible character in the prompt,
     and the index of the character to move to is past the end of the prompt
     string, then redraw the entire prompt string.  We can only do this
     reliably if the terminal supports a `cr' capability.

     This is not an efficiency hack -- there is a problem with redrawing
     portions of the prompt string if they contain terminal escape
     sequences (like drawing the `unbold' sequence without a corresponding
     `bold') that manifests itself on certain terminals. */

  lendiff = local_prompt_len;
  od = ofd - old;	/* index of first difference in visible line */
  if (current_line == 0 && !_rl_horizontal_scroll_mode &&
      _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
      od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX)
    {
#if defined (__MSDOS__)
      putc ('\r', rl_outstream);
#else
      tputs (_rl_term_cr, 1, _rl_output_character_function);
#endif
      if (modmark)
	_rl_output_some_chars ("*", 1);
      _rl_output_some_chars (local_prompt, lendiff);
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	{
	  /* We take wrap_offset into account here so we can pass correct
	     information to _rl_move_cursor_relative. */
	  _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff, 1) - wrap_offset + modmark;
	  cpos_adjusted = 1;
	}
      else
	_rl_last_c_pos = lendiff + modmark;
    }

  o_cpos = _rl_last_c_pos;

  /* When this function returns, _rl_last_c_pos is correct, and an absolute
     cursor postion in multibyte mode, but a buffer index when not in a
     multibyte locale. */
  _rl_move_cursor_relative (od, old);
#if 1
#if defined (HANDLE_MULTIBYTE)
  /* We need to indicate that the cursor position is correct in the presence of
     invisible characters in the prompt string.  Let's see if setting this when
     we make sure we're at the end of the drawn prompt string works. */
  if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 &&
      (_rl_last_c_pos > 0 || o_cpos > 0) &&
      _rl_last_c_pos == prompt_physical_chars)
    cpos_adjusted = 1;
#endif
#endif

  /* if (len (new) > len (old))
     lendiff == difference in buffer
     col_lendiff == difference on screen
     When not using multibyte characters, these are equal */
  lendiff = (nls - nfd) - (ols - ofd);
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    col_lendiff = _rl_col_width (new, nfd - new, nls - new, 1) - _rl_col_width (old, ofd - old, ols - old, 1);
  else
    col_lendiff = lendiff;

  /* If we are changing the number of invisible characters in a line, and
     the spot of first difference is before the end of the invisible chars,
     lendiff needs to be adjusted. */
  if (current_line == 0 && !_rl_horizontal_scroll_mode &&
      current_invis_chars != visible_wrap_offset)
    {
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	{
	  lendiff += visible_wrap_offset - current_invis_chars;
	  col_lendiff += visible_wrap_offset - current_invis_chars;
	}
      else
	{
	  lendiff += visible_wrap_offset - current_invis_chars;
	  col_lendiff = lendiff;
	}
    }

  /* Insert (diff (len (old), len (new)) ch. */
  temp = ne - nfd;
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    col_temp = _rl_col_width (new, nfd - new, ne - new, 1);
  else
    col_temp = temp;