display.c

android-w.song.android.widget

  prompt_last_invisible = prompt_invis_chars_first_line = 0;
  prompt_visible_length = prompt_physical_chars = 0;

  if (prompt == 0 || *prompt == 0)
    return (0);

  p = strrchr (prompt, '\n');
  if (!p)
    {
      /* The prompt is only one logical line, though it might wrap. */
      local_prompt = expand_prompt (prompt, &prompt_visible_length,
					    &prompt_last_invisible,
					    &prompt_invis_chars_first_line,
					    &prompt_physical_chars);
      local_prompt_prefix = (char *)0;
      local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
      return (prompt_visible_length);
    }
  else
    {
      /* The prompt spans multiple lines. */
      t = ++p;
      local_prompt = expand_prompt (p, &prompt_visible_length,
				       &prompt_last_invisible,
				       &prompt_invis_chars_first_line,
				       &prompt_physical_chars);
      c = *t; *t = '\0';
      /* The portion of the prompt string up to and including the
	 final newline is now null-terminated. */
      local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
						   (int *)NULL,
						   (int *)NULL,
						   (int *)NULL);
      *t = c;
      local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
      return (prompt_prefix_length);
    }
}

/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
   arrays of line break markers.  MINSIZE is the minimum size of VISIBLE_LINE
   and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
   increased.  If the lines have already been allocated, this ensures that
   they can hold at least MINSIZE characters. */
static void
init_line_structures (minsize)
      int minsize;
{
  register int n;

  if (invisible_line == 0)	/* initialize it */
    {
      if (line_size < minsize)
	line_size = minsize;
      visible_line = (char *)xmalloc (line_size);
      invisible_line = (char *)xmalloc (line_size);
    }
  else if (line_size < minsize)	/* ensure it can hold MINSIZE chars */
    {
      line_size *= 2;
      if (line_size < minsize)
	line_size = minsize;
      visible_line = (char *)xrealloc (visible_line, line_size);
      invisible_line = (char *)xrealloc (invisible_line, line_size);
    }

  for (n = minsize; n < line_size; n++)
    {
      visible_line[n] = 0;
      invisible_line[n] = 1;
    }

  if (vis_lbreaks == 0)
    {
      /* should be enough. */
      inv_lbsize = vis_lbsize = 256;

#if defined (HANDLE_MULTIBYTE)
      line_state_visible->wbsize = vis_lbsize;
      line_state_visible->wrapped_line = (int *)xmalloc (line_state_visible->wbsize * sizeof (int));

      line_state_invisible->wbsize = inv_lbsize;
      line_state_invisible->wrapped_line = (int *)xmalloc (line_state_invisible->wbsize * sizeof (int));
#endif

      inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
      vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
      inv_lbreaks[0] = vis_lbreaks[0] = 0;
    }

  line_structures_initialized = 1;
}
  
/* Basic redisplay algorithm. */
void
rl_redisplay ()
{
  register int in, out, c, linenum, cursor_linenum;
  register char *line;
  int inv_botlin, lb_botlin, lb_linenum, o_cpos;
  int newlines, lpos, temp, n0, num, prompt_lines_estimate;
  char *prompt_this_line;
#if defined (HANDLE_MULTIBYTE)
  wchar_t wc;
  size_t wc_bytes;
  int wc_width;
  mbstate_t ps;
  int _rl_wrapped_multicolumn = 0;
#endif

  if (_rl_echoing_p == 0)
    return;

  /* Block keyboard interrupts because this function manipulates global
     data structures. */
  _rl_block_sigint ();  
  RL_SETSTATE (RL_STATE_REDISPLAYING);

  if (!rl_display_prompt)
    rl_display_prompt = "";

  if (line_structures_initialized == 0)
    {
      init_line_structures (0);
      rl_on_new_line ();
    }

  /* Draw the line into the buffer. */
  cpos_buffer_position = -1;

  prompt_multibyte_chars = prompt_visible_length - prompt_physical_chars;

  line = invisible_line;
  out = inv_botlin = 0;

  /* Mark the line as modified or not.  We only do this for history
     lines. */
  modmark = 0;
  if (_rl_mark_modified_lines && current_history () && rl_undo_list)
    {
      line[out++] = '*';
      line[out] = '\0';
      modmark = 1;
    }

  /* If someone thought that the redisplay was handled, but the currently
     visible line has a different modification state than the one about
     to become visible, then correct the caller's misconception. */
  if (visible_line[0] != invisible_line[0])
    rl_display_fixed = 0;

  /* If the prompt to be displayed is the `primary' readline prompt (the
     one passed to readline()), use the values we have already expanded.
     If not, use what's already in rl_display_prompt.  WRAP_OFFSET is the
     number of non-visible characters in the prompt string. */
  if (rl_display_prompt == rl_prompt || local_prompt)
    {
      if (local_prompt_prefix && forced_display)
	_rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));

      if (local_prompt_len > 0)
	{
	  temp = local_prompt_len + out + 2;
	  if (temp >= line_size)
	    {
	      line_size = (temp + 1024) - (temp % 1024);
	      visible_line = (char *)xrealloc (visible_line, line_size);
	      line = invisible_line = (char *)xrealloc (invisible_line, line_size);
	    }
	  strncpy (line + out, local_prompt, local_prompt_len);
	  out += local_prompt_len;
	}
      line[out] = '\0';
      wrap_offset = local_prompt_len - prompt_visible_length;
    }
  else
    {
      int pmtlen;
      prompt_this_line = strrchr (rl_display_prompt, '\n');
      if (!prompt_this_line)
	prompt_this_line = rl_display_prompt;
      else
	{
	  prompt_this_line++;
	  pmtlen = prompt_this_line - rl_display_prompt;	/* temp var */
	  if (forced_display)
	    {
	      _rl_output_some_chars (rl_display_prompt, pmtlen);
	      /* Make sure we are at column zero even after a newline,
		 regardless of the state of terminal output processing. */
	      if (pmtlen < 2 || prompt_this_line[-2] != '\r')
		cr ();
	    }
	}

      prompt_physical_chars = pmtlen = strlen (prompt_this_line);
      temp = pmtlen + out + 2;
      if (temp >= line_size)
	{
	  line_size = (temp + 1024) - (temp % 1024);
	  visible_line = (char *)xrealloc (visible_line, line_size);
	  line = invisible_line = (char *)xrealloc (invisible_line, line_size);
	}
      strncpy (line + out,  prompt_this_line, pmtlen);
      out += pmtlen;
      line[out] = '\0';
      wrap_offset = prompt_invis_chars_first_line = 0;
    }

#define CHECK_INV_LBREAKS() \
      do { \
	if (newlines >= (inv_lbsize - 2)) \
	  { \
	    inv_lbsize *= 2; \
	    inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
	  } \
      } while (0)

#if defined (HANDLE_MULTIBYTE)	  
#define CHECK_LPOS() \
      do { \
	lpos++; \
	if (lpos >= _rl_screenwidth) \
	  { \
	    if (newlines >= (inv_lbsize - 2)) \
	      { \
		inv_lbsize *= 2; \
		inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
	      } \
	    inv_lbreaks[++newlines] = out; \
	    if (newlines >= (line_state_invisible->wbsize - 1)) \
	      { \
		line_state_invisible->wbsize *= 2; \
		line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
	      } \
	    line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn; \
	    lpos = 0; \
	  } \
      } while (0)
#else
#define CHECK_LPOS() \
      do { \
	lpos++; \
	if (lpos >= _rl_screenwidth) \
	  { \
	    if (newlines >= (inv_lbsize - 2)) \
	      { \
		inv_lbsize *= 2; \
		inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
	      } \
	    inv_lbreaks[++newlines] = out; \
	    lpos = 0; \
	  } \
      } while (0)
#endif

  /* inv_lbreaks[i] is where line i starts in the buffer. */
  inv_lbreaks[newlines = 0] = 0;
  lpos = prompt_physical_chars + modmark;

#if defined (HANDLE_MULTIBYTE)
  memset (line_state_invisible->wrapped_line, 0, line_state_invisible->wbsize * sizeof (int));
  num = 0;
#endif

  /* prompt_invis_chars_first_line is the number of invisible characters in
     the first physical line of the prompt.
     wrap_offset - prompt_invis_chars_first_line is the number of invis
     chars on the second (or, more generally, last) line. */

  /* This is zero-based, used to set the newlines */
  prompt_lines_estimate = lpos / _rl_screenwidth;

  /* what if lpos is already >= _rl_screenwidth before we start drawing the
     contents of the command line? */
  while (lpos >= _rl_screenwidth)
    {
      int z;
      /* fix from Darin Johnson <[e-mail]> for prompt string with
         invisible characters that is longer than the screen width.  The
         prompt_invis_chars_first_line variable could be made into an array
         saying how many invisible characters there are per line, but that's
         probably too much work for the benefit gained.  How many people have
         prompts that exceed two physical lines?
         Additional logic fix from Edward Catmur <[e-mail]> */
#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0)
	{
	  n0 = num;
          temp = local_prompt_len;
          while (num < temp)
	    {
	      z = _rl_col_width  (local_prompt, n0, num, 1);
	      if (z > _rl_screenwidth)
		{
	          num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
	          break;
		}
	      else if (z == _rl_screenwidth)
	        break;
	      num++;
	    }
          temp = num;
	}
      else
#endif /* !HANDLE_MULTIBYTE */
	temp = ((newlines + 1) * _rl_screenwidth);

      /* Now account for invisible characters in the current line. */
      /* XXX - this assumes that the invisible characters may be split, but only
	 between the first and the last lines. */
      temp += ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
							     : ((newlines == prompt_lines_estimate) ? wrap_offset : prompt_invis_chars_first_line))
					  : ((newlines == 0) ? wrap_offset : 0));
             
      inv_lbreaks[++newlines] = temp;
#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0)
	lpos -= _rl_col_width (local_prompt, n0, num, 1);
      else
#endif
	lpos -= _rl_screenwidth;
    }

  prompt_last_screen_line = newlines;

  /* Draw the rest of the line (after the prompt) into invisible_line, keeping
     track of where the cursor is (cpos_buffer_position), the number of the line containing
     the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
     It maintains an array of line breaks for display (inv_lbreaks).
     This handles expanding tabs for display and displaying meta characters. */
  lb_linenum = 0;
#if defined (HANDLE_MULTIBYTE)
  in = 0;
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    {
      memset (&ps, 0, sizeof (mbstate_t));
      /* XXX - what if wc_bytes ends up <= 0? check for MB_INVALIDCH */
      wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
    }
  else
    wc_bytes = 1;
  while (in < rl_end)
#else
  for (in = 0; in < rl_end; in++)
#endif
    {
      c = (unsigned char)rl_line_buffer[in];

#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	{
	  if (MB_INVALIDCH (wc_bytes))
	    {
	      /* Byte sequence is invalid or shortened.  Assume that the
	         first byte represents a character. */
	      wc_bytes = 1;
	      /* Assume that a character occupies a single column. */
	      wc_width = 1;
	      memset (&ps, 0, sizeof (mbstate_t));
	    }
	  else if (MB_NULLWCH (wc_bytes))
	    break;			/* Found '\0' */
	  else
	    {
	      temp = wcwidth (wc);
	      wc_width = (temp >= 0) ? temp : 1;
	    }
	}
#endif

      if (out + 8 >= line_size)		/* XXX - 8 for \t */
	{
	  line_size *= 2;
	  visible_line = (char *)xrealloc (visible_line, line_size);
	  invisible_line = (char *)xrealloc (invisible_line, line_size);
	  line = invisible_line;
	}

      if (in == rl_point)
	{
	  cpos_buffer_position = out;
	  lb_linenum = newlines;
	}

#if defined (HANDLE_MULTIBYTE)
      if (META_CHAR (c) && _rl_output_meta_chars == 0)	/* XXX - clean up */
#else
      if (META_CHAR (c))
#endif
	{
	  if (_rl_output_meta_chars == 0)
	    {
	      sprintf (line + out, "\\%o", c);

	      if (lpos + 4 >= _rl_screenwidth)
		{
		  temp = _rl_screenwidth - lpos;