xdisp.c 161 KB
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/* Display generation from window structure and buffer text.
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   Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 97, 1998
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     Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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#include <config.h>
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#include <stdio.h>
/*#include <ctype.h>*/
#undef NULL
#include "lisp.h"
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#include "frame.h"
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#include "window.h"
#include "termchar.h"
#include "dispextern.h"
#include "buffer.h"
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#include "charset.h"
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#include "indent.h"
#include "commands.h"
#include "macros.h"
#include "disptab.h"
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#include "termhooks.h"
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#include "intervals.h"
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#include "keyboard.h"
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#include "coding.h"
#include "process.h"
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#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI)
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extern void set_frame_menubar ();
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extern int pending_menu_activation;
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#endif

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extern int interrupt_input;
extern int command_loop_level;

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extern int minibuffer_auto_raise;

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extern Lisp_Object Qface;

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extern Lisp_Object Voverriding_local_map;
extern Lisp_Object Voverriding_local_map_menu_flag;

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Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
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Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
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Lisp_Object Qredisplay_end_trigger_functions;
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/* Nonzero means print newline to stdout before next minibuffer message.  */
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int noninteractive_need_newline;

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/* Nonzero means print newline to message log before next message.  */

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static int message_log_need_newline;
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#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
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#define minmax(floor, val, ceil) \
	((val) < (floor) ? (floor) : (val) > (ceil) ? (ceil) : (val))
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/* The buffer position of the first character appearing
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 entirely or partially on the current frame line.
 Or zero, which disables the optimization for the current frame line. */
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static int this_line_bufpos;

/* Number of characters past the end of this line,
   including the terminating newline */
static int this_line_endpos;

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/* The vertical position of this frame line. */
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static int this_line_vpos;

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/* Hpos value for start of display on this frame line.
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   Usually zero, but negative if first character really began
   on previous line */
static int this_line_start_hpos;

/* Buffer that this_line variables are describing. */
static struct buffer *this_line_buffer;

/* Value of echo_area_glyphs when it was last acted on.
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  If this is nonzero, there is a message on the frame
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  in the minibuffer and it should be erased as soon
  as it is no longer requested to appear. */
char *previous_echo_glyphs;

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/* Nonzero means truncate lines in all windows less wide than the frame */
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int truncate_partial_width_windows;

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/* Nonzero means we have more than one non-minibuffer-only frame.
   Not guaranteed to be accurate except while parsing frame-title-format.  */
int multiple_frames;

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Lisp_Object Vglobal_mode_string;

/* Marker for where to display an arrow on top of the buffer text.  */
Lisp_Object Voverlay_arrow_position;

/* String to display for the arrow.  */
Lisp_Object Voverlay_arrow_string;

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/* Values of those variables at last redisplay.
   However, if Voverlay_arrow_position is a marker,
   last_arrow_position is its numerical position.  */
static Lisp_Object last_arrow_position, last_arrow_string;

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/* Like mode-line-format, but for the titlebar on a visible frame.  */
Lisp_Object Vframe_title_format;

/* Like mode-line-format, but for the titlebar on an iconified frame.  */
Lisp_Object Vicon_title_format;

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/* List of functions to call when a window's size changes.  These
   functions get one arg, a frame on which one or more windows' sizes
   have changed.  */
static Lisp_Object Vwindow_size_change_functions;

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Lisp_Object Qmenu_bar_update_hook;

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/* Nonzero if overlay arrow has been displayed once in this window.  */
static int overlay_arrow_seen;

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/* Nonzero if visible end of buffer has already been displayed once
   in this window.  (We need this variable in case there are overlay
   strings that get displayed there.)  */
static int zv_strings_seen;

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/* Nonzero means highlight the region even in nonselected windows.  */
static int highlight_nonselected_windows;

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/* If cursor motion alone moves point off frame,
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   Try scrolling this many lines up or down if that will bring it back.  */
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static int scroll_step;
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/* Non-0 means scroll just far enough to bring point back on the screen,
   when appropriate.  */
static int scroll_conservatively;

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/* Recenter the window whenever point gets within this many lines
   of the top or bottom of the window.  */
int scroll_margin;

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/* Number of characters of overlap to show,
   when scrolling a one-line window such as a minibuffer.  */
static int minibuffer_scroll_overlap;

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/* Nonzero if try_window_id has made blank lines at window bottom
 since the last redisplay that paused */
static int blank_end_of_window;

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/* Number of windows showing the buffer of the selected window
   (or another buffer with the same base buffer).
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   keyboard.c refers to this.  */
int buffer_shared;

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/* display_text_line sets these to the frame position (origin 0) of point,
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   whether the window is selected or not.
   Set one to -1 first to determine whether point was found afterwards.  */

static int cursor_vpos;
static int cursor_hpos;

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static int debug_end_pos;
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/* Nonzero means display mode line highlighted */
int mode_line_inverse_video;

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static void redisplay_internal ();
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static int message_log_check_duplicate ();
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static void echo_area_display ();
void mark_window_display_accurate ();
static void redisplay_windows ();
static void redisplay_window ();
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static void update_menu_bar ();
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static void try_window ();
static int try_window_id ();
static struct position *display_text_line ();
static void display_mode_line ();
static int display_mode_element ();
static char *decode_mode_spec ();
static int display_string ();
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static void display_menu_bar ();
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static int display_count_lines ();
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/* Prompt to display in front of the minibuffer contents */
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Lisp_Object minibuf_prompt;
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/* Width in columns of current minibuffer prompt.  */
int minibuf_prompt_width;

/* Message to display instead of minibuffer contents
   This is what the functions error and message make,
   and command echoing uses it as well.
   It overrides the minibuf_prompt as well as the buffer.  */
char *echo_area_glyphs;

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/* This is the length of the message in echo_area_glyphs.  */
int echo_area_glyphs_length;

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/* This is the window where the echo area message was displayed.
   It is always a minibuffer window, but it may not be the
   same window currently active as a minibuffer.  */
Lisp_Object echo_area_window;

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/* Nonzero means multibyte characters were enabled when the echo area
   message was specified.  */
int message_enable_multibyte;

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/* true iff we should redraw the mode lines on the next redisplay */
int update_mode_lines;

/* Smallest number of characters before the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int beg_unchanged;

/* Smallest number of characters after the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int end_unchanged;

/* MODIFF as of last redisplay that finished;
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   if it matches MODIFF, and overlay_unchanged_modified
   matches OVERLAY_MODIFF, that means beg_unchanged and end_unchanged
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   contain no useful information */
int unchanged_modified;

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/* OVERLAY_MODIFF as of last redisplay that finished.  */
int overlay_unchanged_modified;

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/* Nonzero if window sizes or contents have changed
   since last redisplay that finished */
int windows_or_buffers_changed;

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/* Nonzero after display_mode_line if %l was used
   and it displayed a line number.  */
int line_number_displayed;

/* Maximum buffer size for which to display line numbers.  */
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static int line_number_display_limit;
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/* Number of lines to keep in the message log buffer.
   t means infinite.  nil means don't log at all.  */
Lisp_Object Vmessage_log_max;
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#define COERCE_MARKER(X)	\
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  (MARKERP ((X)) ? Fmarker_position (X) : (X))
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static int pos_tab_offset P_ ((struct window *, int, int));
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/* Output a newline in the *Messages* buffer if "needs" one.  */

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void
message_log_maybe_newline ()
{
  if (message_log_need_newline)
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    message_dolog ("", 0, 1, 0);
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}


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/* Add a string to the message log, optionally terminated with a newline.
   This function calls low-level routines in order to bypass text property
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   hooks, etc. which might not be safe to run.
   MULTIBYTE, if nonzero, means interpret the contents of M as multibyte.  */
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void
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message_dolog (m, len, nlflag, multibyte)
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     char *m;
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     int len, nlflag, multibyte;
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{
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  if (!NILP (Vmessage_log_max))
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    {
      struct buffer *oldbuf;
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      Lisp_Object oldpoint, oldbegv, oldzv;
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      int old_windows_or_buffers_changed = windows_or_buffers_changed;
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      int point_at_end = 0;
      int zv_at_end = 0;
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      oldbuf = current_buffer;
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      Fset_buffer (Fget_buffer_create (build_string ("*Messages*")));
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      current_buffer->undo_list = Qt;
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      oldpoint = Fpoint_marker ();
      oldbegv = Fpoint_min_marker ();
      oldzv = Fpoint_max_marker ();

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      if (PT == Z)
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	point_at_end = 1;
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      if (ZV == Z)
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	zv_at_end = 1;
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      BEGV = BEG;
      BEGV_BYTE = BEG_BYTE;
      ZV = Z;
      ZV_BYTE = Z_BYTE;
      TEMP_SET_PT_BOTH (Z, Z_BYTE);
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      /* Insert the string--maybe converting multibyte to single byte
	 or vice versa, so that all the text fits the buffer.  */
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      if (multibyte
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	  && NILP (current_buffer->enable_multibyte_characters))
	{
	  int c, i = 0, nbytes;
	  /* Convert a multibyte string to single-byte
	     for the *Message* buffer.  */
	  while (i < len)
	    {
	      c = STRING_CHAR (m + i, len - i);
	      i += XFASTINT (Fchar_bytes (make_number (c)));
	      /* Truncate the character to its last byte--we can only hope
		 the user is happy with the character he gets,
		 since if it isn't right, there is no way to do it right.  */
	      c &= 0xff;
	      insert_char (c);
	    }
	}
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      else if (! multibyte
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	       && ! NILP (current_buffer->enable_multibyte_characters))
	{
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	  int i = 0;
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	  unsigned char *msg = (unsigned char *) m;
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	  /* Convert a single-byte string to multibyte
	     for the *Message* buffer.  */
	  while (i < len)
	    {
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	      int c = unibyte_char_to_multibyte (msg[i++]);
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	      insert_char (c);
	    }
	}
      else if (len)
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	insert_1 (m, len, 1, 0, 0);
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      if (nlflag)
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	{
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	  int this_bol, this_bol_byte, prev_bol, prev_bol_byte, dup;
	  insert_1 ("\n", 1, 1, 0, 0);

	  scan_newline (Z, Z_BYTE, BEG, BEG_BYTE, -2, 0);
	  this_bol = PT;
	  this_bol_byte = PT_BYTE;
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	  if (this_bol > BEG)
	    {
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	      scan_newline (PT, PT_BYTE, BEG, BEG_BYTE, -2, 0);
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	      prev_bol = PT;
	      prev_bol_byte = PT_BYTE;

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	      dup = message_log_check_duplicate (prev_bol, prev_bol_byte,
						 this_bol, this_bol_byte);
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	      if (dup)
		{
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		  del_range_both (prev_bol, this_bol,
				  prev_bol_byte, this_bol_byte, 0);
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		  if (dup > 1)
		    {
		      char dupstr[40];
		      int duplen;

		      /* If you change this format, don't forget to also
			 change message_log_check_duplicate.  */
		      sprintf (dupstr, " [%d times]", dup);
		      duplen = strlen (dupstr);
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		      TEMP_SET_PT_BOTH (Z - 1, Z_BYTE - 1);
		      insert_1 (dupstr, duplen, 1, 0, 1);
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		    }
		}
	    }

	  if (NATNUMP (Vmessage_log_max))
	    {
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	      scan_newline (Z, Z_BYTE, BEG, BEG_BYTE,
			    -XFASTINT (Vmessage_log_max) - 1, 0);
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	      del_range_both (BEG, PT, BEG_BYTE, PT_BYTE, 0);
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	    }
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	}
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      BEGV = XMARKER (oldbegv)->charpos;
      BEGV_BYTE = marker_byte_position (oldbegv);

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      if (zv_at_end)
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	{
	  ZV = Z;
	  ZV_BYTE = Z_BYTE;
	}
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      else
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	{
	  ZV = XMARKER (oldzv)->charpos;
	  ZV_BYTE = marker_byte_position (oldzv);
	}

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      if (point_at_end)
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	TEMP_SET_PT_BOTH (Z, Z_BYTE);
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      else
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	Fgoto_char (oldpoint);

      free_marker (oldpoint);
      free_marker (oldbegv);
      free_marker (oldzv);

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      set_buffer_internal (oldbuf);
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      windows_or_buffers_changed = old_windows_or_buffers_changed;
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      message_log_need_newline = !nlflag;
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    }
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}

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/* We are at the end of the buffer after just having inserted a newline.
   (Note: We depend on the fact we won't be crossing the gap.)
   Check to see if the most recent message looks a lot like the previous one.
   Return 0 if different, 1 if the new one should just replace it, or a
   value N > 1 if we should also append " [N times]".  */
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static int
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message_log_check_duplicate (prev_bol, prev_bol_byte, this_bol, this_bol_byte)
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     int prev_bol, this_bol;
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     int prev_bol_byte, this_bol_byte;
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{
  int i;
  int len = Z - 1 - this_bol;
  int seen_dots = 0;
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  unsigned char *p1 = BUF_BYTE_ADDRESS (current_buffer, prev_bol_byte);
  unsigned char *p2 = BUF_BYTE_ADDRESS (current_buffer, this_bol_byte);
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  for (i = 0; i < len; i++)
    {
      if (i >= 3 && p1[i-3] == '.' && p1[i-2] == '.' && p1[i-1] == '.'
	  && p1[i] != '\n')
	seen_dots = 1;
      if (p1[i] != p2[i])
	return seen_dots;
    }
  p1 += len;
  if (*p1 == '\n')
    return 2;
  if (*p1++ == ' ' && *p1++ == '[')
    {
      int n = 0;
      while (*p1 >= '0' && *p1 <= '9')
	n = n * 10 + *p1++ - '0';
      if (strncmp (p1, " times]\n", 8) == 0)
	return n+1;
    }
  return 0;
}
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/* Display an echo area message M with a specified length of LEN chars.
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   The string may include null characters.  If M is 0, clear out any
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   existing message, and let the minibuffer text show through.
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   The buffer M must continue to exist until after the echo area
   gets cleared or some other message gets displayed there.

   Do not pass text that is stored in a Lisp string.
   Do not pass text in a buffer that was alloca'd.  */
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void
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message2 (m, len, multibyte)
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     char *m;
     int len;
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     int multibyte;
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{
  /* First flush out any partial line written with print.  */
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  message_log_maybe_newline ();
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  if (m)
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    message_dolog (m, len, 1, multibyte);
  message2_nolog (m, len, multibyte);
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}


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/* The non-logging counterpart of message2.  */
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void
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message2_nolog (m, len, multibyte)
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     char *m;
     int len;
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{
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  message_enable_multibyte = multibyte;
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  if (noninteractive)
    {
      if (noninteractive_need_newline)
	putc ('\n', stderr);
      noninteractive_need_newline = 0;
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      if (m)
	fwrite (m, len, 1, stderr);
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      if (cursor_in_echo_area == 0)
	fprintf (stderr, "\n");
      fflush (stderr);
    }
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  else if (INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    {
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      Lisp_Object mini_window;
      FRAME_PTR f;
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      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));

      FRAME_SAMPLE_VISIBILITY (f);
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      if (FRAME_VISIBLE_P (selected_frame)
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	  && ! FRAME_VISIBLE_P (f))
	Fmake_frame_visible (WINDOW_FRAME (XWINDOW (mini_window)));
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      if (m)
	{
	  echo_area_glyphs = m;
	  echo_area_glyphs_length = len;
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	  if (minibuffer_auto_raise)
	    Fraise_frame  (WINDOW_FRAME (XWINDOW (mini_window)));
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	}
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      else
	echo_area_glyphs = previous_echo_glyphs = 0;

      do_pending_window_change ();
      echo_area_display ();
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      update_frame (f, 1, 1);
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      do_pending_window_change ();
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      if (frame_up_to_date_hook != 0 && ! gc_in_progress)
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	(*frame_up_to_date_hook) (f);
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    }
}
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/* Display in echo area the null-terminated ASCII-only string M.
   If M is 0, clear out any existing message,
   and let the minibuffer text show through.
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   The string M must continue to exist until after the echo area
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   gets cleared or some other message gets displayed there.

   Do not pass text that is stored in a Lisp string.
   Do not pass text in a buffer that was alloca'd.  */
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void
message1 (m)
     char *m;
{
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  message2 (m, (m ? strlen (m) : 0), 0);
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}

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void
message1_nolog (m)
     char *m;
{
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  message2_nolog (m, (m ? strlen (m) : 0), 0);
}

/* Display a message M which contains a single %s
   which gets replaced with STRING.  */

void
message_with_string (m, string, log)
     char *m;
     Lisp_Object string;
     int log;
{
  if (noninteractive)
    {
      if (m)
	{
	  if (noninteractive_need_newline)
	    putc ('\n', stderr);
	  noninteractive_need_newline = 0;
	  fprintf (stderr, m, XSTRING (string)->data);
	  if (cursor_in_echo_area == 0)
	    fprintf (stderr, "\n");
	  fflush (stderr);
	}
    }
  else if (INTERACTIVE)
    {
      /* The frame whose minibuffer we're going to display the message on.
	 It may be larger than the selected frame, so we need
	 to use its buffer, not the selected frame's buffer.  */
      Lisp_Object mini_window;
      FRAME_PTR f;

      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));

      /* A null message buffer means that the frame hasn't really been
	 initialized yet.  Error messages get reported properly by
	 cmd_error, so this must be just an informative message; toss it.  */
      if (FRAME_MESSAGE_BUF (f))
	{
	  int len;
	  char *a[1];
	  a[0] = (char *) XSTRING (string)->data;

	  len = doprnt (FRAME_MESSAGE_BUF (f),
			FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a);

	  if (log)
	    message2 (FRAME_MESSAGE_BUF (f), len,
		      STRING_MULTIBYTE (string));
	  else
	    message2_nolog (FRAME_MESSAGE_BUF (f), len,
			    STRING_MULTIBYTE (string));

	  /* Print should start at the beginning of the message
	     buffer next time.  */
	  message_buf_print = 0;
	}
    }
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}

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/* Truncate what will be displayed in the echo area
   the next time we display it--but don't redisplay it now.  */

void
truncate_echo_area (len)
     int len;
{
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  if (!noninteractive && INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    echo_area_glyphs_length = len;
}

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/* Nonzero if FRAME_MESSAGE_BUF (selected_frame) is being used by print;
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   zero if being used by message.  */
int message_buf_print;

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/* Dump an informative message to the minibuf.  If M is 0, clear out
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   any existing message, and let the minibuffer text show through.  */
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/* VARARGS 1 */
void
message (m, a1, a2, a3)
     char *m;
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     EMACS_INT a1, a2, a3;
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{
  if (noninteractive)
    {
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      if (m)
	{
	  if (noninteractive_need_newline)
	    putc ('\n', stderr);
	  noninteractive_need_newline = 0;
	  fprintf (stderr, m, a1, a2, a3);
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	  if (cursor_in_echo_area == 0)
	    fprintf (stderr, "\n");
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	  fflush (stderr);
	}
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    }
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  else if (INTERACTIVE)
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    {
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      /* The frame whose minibuffer we're going to display the message on.
	 It may be larger than the selected frame, so we need
	 to use its buffer, not the selected frame's buffer.  */
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      Lisp_Object mini_window;
      FRAME_PTR f;

      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
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      /* A null message buffer means that the frame hasn't really been
	 initialized yet.  Error messages get reported properly by
	 cmd_error, so this must be just an informative message; toss it.  */
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      if (FRAME_MESSAGE_BUF (f))
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	{
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	  if (m)
	    {
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	      int len;
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#ifdef NO_ARG_ARRAY
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	      char *a[3];
	      a[0] = (char *) a1;
	      a[1] = (char *) a2;
	      a[2] = (char *) a3;
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	      len = doprnt (FRAME_MESSAGE_BUF (f),
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			    FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a);
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#else
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	      len = doprnt (FRAME_MESSAGE_BUF (f),
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			    FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3,
			    (char **) &a1);
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#endif /* NO_ARG_ARRAY */

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	      message2 (FRAME_MESSAGE_BUF (f), len, 0);
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	    }
	  else
	    message1 (0);

	  /* Print should start at the beginning of the message
	     buffer next time.  */
	  message_buf_print = 0;
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	}
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    }
}

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/* The non-logging version of message.  */
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void
message_nolog (m, a1, a2, a3)
     char *m;
     EMACS_INT a1, a2, a3;
{
  Lisp_Object old_log_max;
  old_log_max = Vmessage_log_max;
  Vmessage_log_max = Qnil;
  message (m, a1, a2, a3);
  Vmessage_log_max = old_log_max;
}

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void
update_echo_area ()
{
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  message2 (echo_area_glyphs, echo_area_glyphs_length,
	    ! NILP (current_buffer->enable_multibyte_characters));
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}
732

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static void
echo_area_display ()
{
  register int vpos;
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  FRAME_PTR f;
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  Lisp_Object mini_window;
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  /* Choose the minibuffer window for this display.
     It is the minibuffer window used by the selected frame.  */
  mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
  /* This is the frame that window is in.  */
  f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
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  if (! FRAME_VISIBLE_P (f))
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    return;

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  if (frame_garbaged)
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    {
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      redraw_garbaged_frames ();
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      frame_garbaged = 0;
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    }

  if (echo_area_glyphs || minibuf_level == 0)
    {
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      int i;

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      echo_area_window = mini_window;

      vpos = XFASTINT (XWINDOW (mini_window)->top);
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      get_display_line (f, vpos, 0);
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      /* Make sure the columns that overlap a left-hand scroll bar
	 are always clear.  */
      for (i = 0; i < FRAME_LEFT_SCROLL_BAR_WIDTH (f); i++)
	f->desired_glyphs->glyphs[vpos][i] = SPACEGLYPH;

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      display_string (XWINDOW (mini_window), vpos,
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		      echo_area_glyphs ? echo_area_glyphs : "",
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		      echo_area_glyphs ? echo_area_glyphs_length : -1,
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		      FRAME_LEFT_SCROLL_BAR_WIDTH (f),
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		      0, 0, 0,
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		      FRAME_WIDTH (f) + FRAME_LEFT_SCROLL_BAR_WIDTH (f),
		      message_enable_multibyte);
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#if 0 /* This just gets in the way.  update_frame does the job.  */
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      /* If desired cursor location is on this line, put it at end of text */
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      if (cursor_in_echo_area)
	FRAME_CURSOR_Y (f) = vpos;
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      if (FRAME_CURSOR_Y (f) == vpos)
	FRAME_CURSOR_X (f) = FRAME_DESIRED_GLYPHS (f)->used[vpos];
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#endif
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      /* Fill the rest of the minibuffer window with blank lines.  */
      {
	int i;

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	for (i = vpos + 1;
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	     i < vpos + XFASTINT (XWINDOW (mini_window)->height); i++)
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	  {
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	    get_display_line (f, i, 0);
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	    /* We don't use FRAME_SCROLL_BAR_WIDTH (f) as the starting
	       hpos, because it is good to clear whatever is behind the
	       scroll bar.  This does not affect the scroll bar itself.  */
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	    display_string (XWINDOW (mini_window), i,
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			    "", 0, 
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                            0, 0, 0,
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                            0, FRAME_WIDTH (f) + FRAME_SCROLL_BAR_WIDTH (f),
			    0);
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	  }
      }
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    }
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  else if (!EQ (mini_window, selected_window))
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    windows_or_buffers_changed++;

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  if (EQ (mini_window, selected_window))
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    this_line_bufpos = 0;

  previous_echo_glyphs = echo_area_glyphs;
}
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/* Update frame titles.  */
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#ifdef HAVE_WINDOW_SYSTEM
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static char frame_title_buf[512];
static char *frame_title_ptr;
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static int
store_frame_title (str, mincol, maxcol)
     char *str;
     int mincol, maxcol;
{
  char *limit;
  if (maxcol < 0 || maxcol >= sizeof(frame_title_buf))
    maxcol = sizeof (frame_title_buf);
  limit = &frame_title_buf[maxcol];
  while (*str != '\0' && frame_title_ptr < limit)
    *frame_title_ptr++ = *str++;
  while (frame_title_ptr < &frame_title_buf[mincol])
    *frame_title_ptr++ = ' ';
  return frame_title_ptr - frame_title_buf;
}
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static void
x_consider_frame_title (frame)
     Lisp_Object frame;
{
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  Lisp_Object fmt;
  struct buffer *obuf;
  int len;
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  FRAME_PTR f = XFRAME (frame);

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  if (!(FRAME_WINDOW_P (f) || FRAME_MINIBUF_ONLY_P (f) || f->explicit_name))
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    return;
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  /* Do we have more than one visible frame on this X display?  */
  {
    Lisp_Object tail;

    for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
      {
	FRAME_PTR tf = XFRAME (XCONS (tail)->car);

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	if (tf != f && FRAME_KBOARD (tf) == FRAME_KBOARD (f)
	    && !FRAME_MINIBUF_ONLY_P (tf)
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	    && (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf)))
	  break;
      }

    multiple_frames = CONSP (tail);
  }

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  obuf = current_buffer;
  Fset_buffer (XWINDOW (f->selected_window)->buffer);
  fmt = (FRAME_ICONIFIED_P (f) ? Vicon_title_format : Vframe_title_format);
  frame_title_ptr = frame_title_buf;
  len = display_mode_element (XWINDOW (f->selected_window), 0, 0, 0,
			      0, sizeof (frame_title_buf), fmt);
  frame_title_ptr = 0;
  set_buffer_internal (obuf);
  /* Set the name only if it's changed.  This avoids consing
     in the common case where it hasn't.  (If it turns out that we've
     already wasted too much time by walking through the list with
     display_mode_element, then we might need to optimize at a higher
     level than this.)  */
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  if (! STRINGP (f->name) || XSTRING (f->name)->size_byte != len
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      || bcmp (frame_title_buf, XSTRING (f->name)->data, len) != 0)
    x_implicitly_set_name (f, make_string (frame_title_buf, len), Qnil);
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}
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#else
#define frame_title_ptr ((char *)0)
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#define store_frame_title(str, mincol, maxcol) 0
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#endif
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885

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/* Prepare for redisplay by updating menu-bar item lists when appropriate.
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   This can call eval.  */
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void
prepare_menu_bars ()
{
  register struct window *w = XWINDOW (selected_window);
  int all_windows;
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  struct gcpro gcpro1, gcpro2;
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  all_windows = (update_mode_lines || buffer_shared > 1
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		 || windows_or_buffers_changed);
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  /* Update all frame titles based on their buffer names, etc.
     We do this before the menu bars so that the buffer-menu
     will show the up-to-date frame titles.

     This used to be done after the menu bars, for a reason that
     was stated as follows but which I do not understand:
     "We do this after the menu bars so that the frame will first
     create its menu bar using the name `emacs' if no other name
     has yet been specified."
     I think that is no longer a concern.  */
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#ifdef HAVE_WINDOW_SYSTEM
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  if (windows_or_buffers_changed || update_mode_lines)
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    {
      Lisp_Object tail, frame;

      FOR_EACH_FRAME (tail, frame)
	if (FRAME_VISIBLE_P (XFRAME (frame))
	    || FRAME_ICONIFIED_P (XFRAME (frame)))
	  x_consider_frame_title (frame);
    }
#endif

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  /* Update the menu bar item lists, if appropriate.
     This has to be done before any actual redisplay
     or generation of display lines.  */
  if (all_windows)
    {
      Lisp_Object tail, frame;
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      int count = specpdl_ptr - specpdl;

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      record_unwind_protect (Fstore_match_data, Fmatch_data (Qnil, Qnil));
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      FOR_EACH_FRAME (tail, frame)
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	{
	  /* If a window on this frame changed size,
	     report that to the user and clear the size-change flag.  */
	  if (FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)))
	    {
	      Lisp_Object functions;
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	      /* Clear flag first in case we get error below.  */
	      FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)) = 0;
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	      functions = Vwindow_size_change_functions;
	      GCPRO2 (tail, functions);
	      while (CONSP (functions))
		{
		  call1 (XCONS (functions)->car, frame);
		  functions = XCONS (functions)->cdr;
		}
	      UNGCPRO;
	    }
	  GCPRO1 (tail);
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	  update_menu_bar (XFRAME (frame), 0);
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	  UNGCPRO;
	}
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      unbind_to (count, Qnil);
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    }
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  else
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    update_menu_bar (selected_frame, 1);
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  /* Motif needs this.  See comment in xmenu.c.
     Turn it off when pending_menu_activation is not defined.  */
#ifdef USE_X_TOOLKIT
  pending_menu_activation = 0;
#endif
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}

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/* Do a frame update, taking possible shortcuts into account.
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   This is the main external entry point for redisplay.

   If the last redisplay displayed an echo area message and that
   message is no longer requested, we clear the echo area
   or bring back the minibuffer if that is in use.

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   Do not call eval from within this function.
   Calls to eval after the call to echo_area_display would confuse
   the display_line mechanism and would cause a crash.
   Calls to eval before that point will work most of the time,
   but can still lose, because  this function
   can be called from signal handlers; with alarms set up;
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   or with synchronous processes running.
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   See Fcall_process; if you called it from here, it could be
   entered recursively.  */

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static int do_verify_charstarts;

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/* Counter is used to clear the face cache
   no more than once ever 1000 redisplays.  */
static int clear_face_cache_count;

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/* Record the previous terminal frame we displayed.  */
static FRAME_PTR previous_terminal_frame;

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void
redisplay ()
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{
  redisplay_internal (0);
}

/* If PRESERVE_ECHO_AREA is nonzero, it means this redisplay
   is not in response to any user action; therefore, we should
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   preserve the echo area.  (Actually, our caller does that job.)
   Perhaps in the future avoid recentering windows
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   if it is not necessary; currently that causes some problems.  */

static void
redisplay_internal (preserve_echo_area)
     int preserve_echo_area;
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{
  register struct window *w = XWINDOW (selected_window);
  register int pause;
  int must_finish = 0;
  int all_windows;
  register int tlbufpos, tlendpos;
  struct position pos;