tui-win.c

这个是LINUX下的GDB调度工具的源码

    }
  else
    printf_filtered (WIN_HEIGHT_USAGE);
}

/* Set the height of the specified window, with va_list.    */
static void
tui_set_win_height_command (char *arg, int from_tty)
{
  /* Make sure the curses mode is enabled.  */
  tui_enable ();
  tui_set_win_height (arg, from_tty);
}


/* XDB Compatibility command for setting the window height.  This will
   increase or decrease the command window by the specified amount.  */
static void
tui_xdb_set_win_height (char *arg, int from_tty)
{
  /* Make sure the curses mode is enabled.  */
  tui_enable ();
  if (arg != (char *) NULL)
    {
      int input_no = atoi (arg);

      if (input_no > 0)
	{			/* Add 1 for the locator */
	  int new_height = tui_term_height () - (input_no + 1);

	  if (!new_height_ok (tui_win_list[CMD_WIN], new_height) ||
	      tui_adjust_win_heights (tui_win_list[CMD_WIN],
				    new_height) == TUI_FAILURE)
	    warning ("Invalid window height specified.\n%s",
		     XDBWIN_HEIGHT_USAGE);
	}
      else
	warning ("Invalid window height specified.\n%s",
		 XDBWIN_HEIGHT_USAGE);
    }
  else
    warning ("Invalid window height specified.\n%s", XDBWIN_HEIGHT_USAGE);
}

/* Set the height of the specified window, with va_list.  */
static void
tui_xdb_set_win_height_command (char *arg, int from_tty)
{
  tui_xdb_set_win_height (arg, from_tty);
}


/* Function to adjust all window heights around the primary.   */
static enum tui_status
tui_adjust_win_heights (struct tui_win_info * primary_win_info, int new_height)
{
  enum tui_status status = TUI_FAILURE;

  if (new_height_ok (primary_win_info, new_height))
    {
      status = TUI_SUCCESS;
      if (new_height != primary_win_info->generic.height)
	{
	  int diff;
	  struct tui_win_info * win_info;
	  struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
	  enum tui_layout_type cur_layout = tui_current_layout ();

	  diff = (new_height - primary_win_info->generic.height) * (-1);
	  if (cur_layout == SRC_COMMAND || cur_layout == DISASSEM_COMMAND)
	    {
	      struct tui_win_info * src_win_info;

	      make_invisible_and_set_new_height (primary_win_info, new_height);
	      if (primary_win_info->generic.type == CMD_WIN)
		{
		  win_info = (struct tui_win_info *) (tui_source_windows ())->list[0];
		  src_win_info = win_info;
		}
	      else
		{
		  win_info = tui_win_list[CMD_WIN];
		  src_win_info = primary_win_info;
		}
	      make_invisible_and_set_new_height (win_info,
					     win_info->generic.height + diff);
	      TUI_CMD_WIN->generic.origin.y = locator->origin.y + 1;
	      make_visible_with_new_height (win_info);
	      make_visible_with_new_height (primary_win_info);
	      if (src_win_info->generic.content_size <= 0)
		tui_erase_source_content (src_win_info, EMPTY_SOURCE_PROMPT);
	    }
	  else
	    {
	      struct tui_win_info *first_win;
	      struct tui_win_info *second_win;

	      if (cur_layout == SRC_DISASSEM_COMMAND)
		{
		  first_win = TUI_SRC_WIN;
		  second_win = TUI_DISASM_WIN;
		}
	      else
		{
		  first_win = TUI_DATA_WIN;
		  second_win = (struct tui_win_info *) (tui_source_windows ())->list[0];
		}
	      if (primary_win_info == TUI_CMD_WIN)
		{		/*
				   ** Split the change in height accross the 1st & 2nd windows
				   ** adjusting them as well.
				 */
		  int first_split_diff = diff / 2;	/* subtract the locator */
		  int second_split_diff = first_split_diff;

		  if (diff % 2)
		    {
		      if (first_win->generic.height >
			  second_win->generic.height)
			if (diff < 0)
			  first_split_diff--;
			else
			  first_split_diff++;
		      else
			{
			  if (diff < 0)
			    second_split_diff--;
			  else
			    second_split_diff++;
			}
		    }
		  /* make sure that the minimum hieghts are honored */
		  while ((first_win->generic.height + first_split_diff) < 3)
		    {
		      first_split_diff++;
		      second_split_diff--;
		    }
		  while ((second_win->generic.height + second_split_diff) < 3)
		    {
		      second_split_diff++;
		      first_split_diff--;
		    }
		  make_invisible_and_set_new_height (
						  first_win,
				 first_win->generic.height + first_split_diff);
		  second_win->generic.origin.y = first_win->generic.height - 1;
		  make_invisible_and_set_new_height (
		    second_win, second_win->generic.height + second_split_diff);
		  TUI_CMD_WIN->generic.origin.y = locator->origin.y + 1;
		  make_invisible_and_set_new_height (TUI_CMD_WIN, new_height);
		}
	      else
		{
		  if ((TUI_CMD_WIN->generic.height + diff) < 1)
		    {		/*
				   ** If there is no way to increase the command window
				   ** take real estate from the 1st or 2nd window.
				 */
		      if ((TUI_CMD_WIN->generic.height + diff) < 1)
			{
			  int i;
			  for (i = TUI_CMD_WIN->generic.height + diff;
			       (i < 1); i++)
			    if (primary_win_info == first_win)
			      second_win->generic.height--;
			    else
			      first_win->generic.height--;
			}
		    }
		  if (primary_win_info == first_win)
		    make_invisible_and_set_new_height (first_win, new_height);
		  else
		    make_invisible_and_set_new_height (
						    first_win,
						  first_win->generic.height);
		  second_win->generic.origin.y = first_win->generic.height - 1;
		  if (primary_win_info == second_win)
		    make_invisible_and_set_new_height (second_win, new_height);
		  else
		    make_invisible_and_set_new_height (
				      second_win, second_win->generic.height);
		  TUI_CMD_WIN->generic.origin.y = locator->origin.y + 1;
		  if ((TUI_CMD_WIN->generic.height + diff) < 1)
		    make_invisible_and_set_new_height (TUI_CMD_WIN, 1);
		  else
		    make_invisible_and_set_new_height (
				     TUI_CMD_WIN, TUI_CMD_WIN->generic.height + diff);
		}
	      make_visible_with_new_height (TUI_CMD_WIN);
	      make_visible_with_new_height (second_win);
	      make_visible_with_new_height (first_win);
	      if (first_win->generic.content_size <= 0)
		tui_erase_source_content (first_win, EMPTY_SOURCE_PROMPT);
	      if (second_win->generic.content_size <= 0)
		tui_erase_source_content (second_win, EMPTY_SOURCE_PROMPT);
	    }
	}
    }

  return status;
}


/* Function make the target window (and auxillary windows associated
   with the targer) invisible, and set the new height and location.  */
static void
make_invisible_and_set_new_height (struct tui_win_info * win_info, int height)
{
  int i;
  struct tui_gen_win_info * gen_win_info;

  tui_make_invisible (&win_info->generic);
  win_info->generic.height = height;
  if (height > 1)
    win_info->generic.viewport_height = height - 1;
  else
    win_info->generic.viewport_height = height;
  if (win_info != TUI_CMD_WIN)
    win_info->generic.viewport_height--;

  /* Now deal with the auxillary windows associated with win_info */
  switch (win_info->generic.type)
    {
    case SRC_WIN:
    case DISASSEM_WIN:
      gen_win_info = win_info->detail.source_info.execution_info;
      tui_make_invisible (gen_win_info);
      gen_win_info->height = height;
      gen_win_info->origin.y = win_info->generic.origin.y;
      if (height > 1)
	gen_win_info->viewport_height = height - 1;
      else
	gen_win_info->viewport_height = height;
      if (win_info != TUI_CMD_WIN)
	gen_win_info->viewport_height--;

      if (tui_win_has_locator (win_info))
	{
	  gen_win_info = tui_locator_win_info_ptr ();
	  tui_make_invisible (gen_win_info);
	  gen_win_info->origin.y = win_info->generic.origin.y + height;
	}
      break;
    case DATA_WIN:
      /* delete all data item windows */
      for (i = 0; i < win_info->generic.content_size; i++)
	{
	  gen_win_info = (struct tui_gen_win_info *) & ((struct tui_win_element *)
		      win_info->generic.content[i])->which_element.data_window;
	  tui_delete_win (gen_win_info->handle);
	  gen_win_info->handle = (WINDOW *) NULL;
	}
      break;
    default:
      break;
    }
}


/* Function to make the windows with new heights visible.  This means
   re-creating the windows' content since the window had to be
   destroyed to be made invisible.  */
static void
make_visible_with_new_height (struct tui_win_info * win_info)
{
  struct symtab *s;

  tui_make_visible (&win_info->generic);
  tui_check_and_display_highlight_if_needed (win_info);
  switch (win_info->generic.type)
    {
    case SRC_WIN:
    case DISASSEM_WIN:
      tui_free_win_content (win_info->detail.source_info.execution_info);
      tui_make_visible (win_info->detail.source_info.execution_info);
      if (win_info->generic.content != NULL)
	{
	  union tui_line_or_address line_or_addr;
	  struct symtab_and_line cursal
	    = get_current_source_symtab_and_line ();

	  if (win_info->generic.type == SRC_WIN)
	    line_or_addr.line_no =
	      win_info->detail.source_info.start_line_or_addr.line_no;
	  else
	    line_or_addr.addr =
	      win_info->detail.source_info.start_line_or_addr.addr;
	  tui_free_win_content (&win_info->generic);
	  tui_update_source_window (win_info, cursal.symtab, line_or_addr, TRUE);
	}
      else if (deprecated_selected_frame != (struct frame_info *) NULL)
	{
	  union tui_line_or_address line;
	  struct symtab_and_line cursal = get_current_source_symtab_and_line ();


	  s = find_pc_symtab (get_frame_pc (deprecated_selected_frame));
	  if (win_info->generic.type == SRC_WIN)
	    line.line_no = cursal.line;
	  else
	    {
	      find_line_pc (s, cursal.line, &line.addr);
	    }
	  tui_update_source_window (win_info, s, line, TRUE);
	}
      if (tui_win_has_locator (win_info))
	{
	  tui_make_visible (tui_locator_win_info_ptr ());
	  tui_show_locator_content ();
	}
      break;
    case DATA_WIN:
      tui_display_all_data ();
      break;
    case CMD_WIN:
      win_info->detail.command_info.cur_line = 0;
      win_info->detail.command_info.curch = 0;
      wmove (win_info->generic.handle,
	     win_info->detail.command_info.cur_line,
	     win_info->detail.command_info.curch);
      break;
    default:
      break;
    }
}


static int
new_height_ok (struct tui_win_info * primary_win_info, int new_height)
{
  int ok = (new_height < tui_term_height ());

  if (ok)
    {
      int diff;
      enum tui_layout_type cur_layout = tui_current_layout ();

      diff = (new_height - primary_win_info->generic.height) * (-1);
      if (cur_layout == SRC_COMMAND || cur_layout == DISASSEM_COMMAND)
	{
	  ok = ((primary_win_info->generic.type == CMD_WIN &&
		 new_height <= (tui_term_height () - 4) &&
		 new_height >= MIN_CMD_WIN_HEIGHT) ||
		(primary_win_info->generic.type != CMD_WIN &&
		 new_height <= (tui_term_height () - 2) &&
		 new_height >= MIN_WIN_HEIGHT));
	  if (ok)
	    {			/* check the total height */
	      struct tui_win_info * win_info;

	      if (primary_win_info == TUI_CMD_WIN)
		win_info = (struct tui_win_info *) (tui_source_windows ())->list[0];
	      else
		win_info = TUI_CMD_WIN;
	      ok = ((new_height +
		     (win_info->generic.height + diff)) <= tui_term_height ());
	    }
	}
      else
	{
	  int cur_total_height, total_height, min_height = 0;
	  struct tui_win_info *first_win;
	  struct tui_win_info *second_win;

	  if (cur_layout == SRC_DISASSEM_COMMAND)
	    {
	      first_win = TUI_SRC_WIN;
	      second_win = TUI_DISASM_WIN;
	    }
	  else
	    {
	      first_win = TUI_DATA_WIN;
	      second_win = (struct tui_win_info *) (tui_source_windows ())->list[0];
	    }
	  /*
	     ** We could simply add all the heights to obtain the same result
	     ** but below is more explicit since we subtract 1 for the
	     ** line that the first and second windows share, and add one
	     ** for the locator.
	   */
	  total_height = cur_total_height =
	    (first_win->generic.height + second_win->generic.height - 1)
	    + TUI_CMD_WIN->generic.height + 1 /*locator */ ;
	  if (primary_win_info == TUI_CMD_WIN)
	    {
	      /* locator included since first & second win share a line */
	      ok = ((first_win->generic.height +
		     second_win->generic.height + diff) >=
		    (MIN_WIN_HEIGHT * 2) &&
		    new_height >= MIN_CMD_WIN_HEIGHT);
	      if (ok)
		{
		  total_height = new_height + (first_win->generic.height +
					  second_win->generic.height + diff);
		  min_height = MIN_CMD_WIN_HEIGHT;
		}
	    }
	  else
	    {
	      min_height = MIN_WIN_HEIGHT;
	      /*
	         ** First see if we can increase/decrease the command
	         ** window.  And make sure that the command window is
	         ** at least 1 line
	       */
	      ok = ((TUI_CMD_WIN->generic.height + diff) > 0);
	      if (!ok)
		{		/*
				   ** Looks like we have to increase/decrease one of
				   ** the other windows
				 */
		  if (primary_win_info == first_win)
		    ok = (second_win->generic.height + diff) >= min_height;
		  else
		    ok = (first_win->generic.height + diff) >= min_height;
		}
	      if (ok)
		{
		  if (primary_win_info == first_win)
		    total_height = new_height +
		      second_win->generic.height +
		      TUI_CMD_WIN->generic.height + diff;
		  else
		    total_height = new_height +
		      first_win->generic.height +
		      TUI_CMD_WIN->generic.height + diff;
		}
	    }
	  /*
	     ** Now make sure that the proposed total height doesn't exceed
	     ** the old total height.
	   */
	  if (ok)
	    ok = (new_height >= min_height && total_height <= cur_total_height);
	}
    }

  return ok;
}


static void
parse_scrolling_args (char *arg, struct tui_win_info * * win_to_scroll,
		      int *num_to_scroll)
{
  if (num_to_scroll)
    *num_to_scroll = 0;
  *win_to_scroll = tui_win_with_focus ();

  /*
     ** First set up the default window to scroll, in case there is no
     ** window name arg
   */
  if (arg != (char *) NULL)
    {
      char *buf, *buf_ptr;

      /* process the number of lines to scroll */
      buf = buf_ptr = xstrdup (arg);
      if (isdigit (*buf_ptr))
	{
	  char *num_str;

	  num_str = buf_ptr;
	  buf_ptr = strchr (buf_ptr, ' ');
	  if (buf_ptr != (char *) NULL)
	    {
	      *buf_ptr = (char) 0;
	      if (num_to_scroll)
		*num_to_scroll = atoi (num_str);
	      buf_ptr++;
	    }
	  else if (num_to_scroll)
	    *num_to_scroll = atoi (num_str);
	}

      /* process the window name if one is specified */
      if (buf_ptr != (char *) NULL)
	{
	  char *wname;
	  int i;

	  if (*buf_ptr == ' ')
	    while (*(++buf_ptr) == ' ')
	      ;

	  if (*buf_ptr != (char) 0)
	    wname = buf_ptr;
	  else
	    wname = "?";
	  
	  /* Validate the window name */
	  for (i = 0; i < strlen (wname); i++)
	    wname[i] = toupper (wname[i]);
	  *win_to_scroll = tui_partial_win_by_name (wname);

	  if (*win_to_scroll == (struct tui_win_info *) NULL ||
	      !(*win_to_scroll)->generic.is_visible)
	    warning ("Invalid window specified. \n\
The window name specified must be valid and visible.\n");
	  else if (*win_to_scroll == TUI_CMD_WIN)
	    *win_to_scroll = (struct tui_win_info *) (tui_source_windows ())->list[0];
	}
      xfree (buf);
    }
}