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/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
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   Copyright (C) 1985, 1986, 1987, 1992 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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "config.h"
#include "lisp.h"
#include "buffer.h"
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#include "frame.h"
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#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
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#include "keyboard.h"
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Lisp_Object Qwindowp;

Lisp_Object Fnext_window (), Fdelete_window (), Fselect_window ();
Lisp_Object Fset_window_buffer (), Fsplit_window (), Frecenter ();

static void delete_all_subwindows ();
static struct window *decode_window();

/* This is the window in which the terminal's cursor should
   be left when nothing is being done with it.  This must
   always be a leaf window, and its buffer is selected by
   the top level editing loop at the end of each command.

   This value is always the same as
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   FRAME_SELECTED_WINDOW (selected_frame).  */
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Lisp_Object selected_window;

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/* The minibuffer window of the selected frame.
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   Note that you cannot test for minibufferness of an arbitrary window
   by comparing against this; but you can test for minibufferness of
   the selected window.  */
Lisp_Object minibuf_window;

/* Non-nil means it is the window for C-M-v to scroll
   when the minibuffer is selected.  */
Lisp_Object Vminibuf_scroll_window;

/* Non-nil means this is the buffer whose window C-M-v should scroll.  */
Lisp_Object Vother_window_scroll_buffer;

/* Window that the mouse is over (nil if no mouse support).  */
Lisp_Object Vmouse_window;

/* Last mouse click data structure (nil if no mouse support).  */
Lisp_Object Vmouse_event;

/* Non-nil means it's function to call to display temp buffers.  */
Lisp_Object Vtemp_buffer_show_function;

/* If a window gets smaller than either of these, it is removed. */
int window_min_height;
int window_min_width;

/* Nonzero implies Fdisplay_buffer should create windows. */
int pop_up_windows;

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/* Nonzero implies make new frames for Fdisplay_buffer.  */
int pop_up_frames;
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/* Non-nil means use this function instead of default */
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Lisp_Object Vpop_up_frame_function;
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/* Function to call to handle Fdisplay_buffer.  */
Lisp_Object Vdisplay_buffer_function;

/* Fdisplay_buffer always splits the largest window 
   if that window is more than this high.  */
int split_height_threshold;

/* Number of lines of continuity in scrolling by screenfuls.  */
int next_screen_context_lines;

/* Incremented for each window created.  */
static int sequence_number;

#define min(a, b) ((a) < (b) ? (a) : (b))

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
  "Returns t if OBJ is a window.")
  (obj)
     Lisp_Object obj;
{
  return XTYPE (obj) == Lisp_Window ? Qt : Qnil;
}

Lisp_Object
make_window ()
{
  register Lisp_Object val;
  register struct window *p;

  /* Add sizeof (Lisp_Object) here because sizeof (struct Lisp_Vector)
     includes the first element.  */
  val = Fmake_vector (
    make_number ((sizeof (struct window) - sizeof (struct Lisp_Vector)
		  + sizeof (Lisp_Object))
		 / sizeof (Lisp_Object)),
    Qnil);
  XSETTYPE (val, Lisp_Window);
  p = XWINDOW (val);
  XFASTINT (p->sequence_number) = ++sequence_number;
  XFASTINT (p->left) = XFASTINT (p->top)
    = XFASTINT (p->height) = XFASTINT (p->width)
      = XFASTINT (p->hscroll) = 0;
  XFASTINT (p->last_point_x) = XFASTINT (p->last_point_y) = 0;
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
  XFASTINT (p->use_time) = 0;
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  p->frame = Qnil;
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  p->display_table = Qnil;
  p->dedicated = Qnil;
  return val;
}

DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
  "Return the window that the cursor now appears in and commands apply to.")
  ()
{
  return selected_window;
}

DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 0, 0,
  "Return the window used now for minibuffers.")
  ()
{
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#ifdef MULTI_FRAME
  choose_minibuf_frame ();
#endif /* MULTI_FRAME */
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  return minibuf_window;
}

DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 1, 1, 0,
  "Returns non-nil if WINDOW is a minibuffer window.")
  (window)
     Lisp_Object window;
{
  struct window *w = decode_window (window);
  return (MINI_WINDOW_P (w) ? Qt : Qnil);
}

DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
  Spos_visible_in_window_p, 0, 2, 0,
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  "Return t if position POS is currently on the frame in WINDOW.\n\
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Returns nil if that position is scrolled vertically out of view.\n\
POS defaults to point; WINDOW, to the selected window.")
  (pos, window)
     Lisp_Object pos, window;
{
  register struct window *w;
  register int top;
  register int height;
  register int posint;
  register struct buffer *buf;
  struct position posval;

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  if (NILP (pos))
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    posint = point;
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 1);
  w = XWINDOW (window);
  top = marker_position (w->start);

  if (posint < top)
    return Qnil;

  height = XFASTINT (w->height) - ! MINI_WINDOW_P (w);

  buf = XBUFFER (w->buffer);
  if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf))
    {
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      /* If frame is up to date,
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	 use the info recorded about how much text fit on it. */
      if (posint < BUF_Z (buf) - XFASTINT (w->window_end_pos)
	  || (XFASTINT (w->window_end_vpos) < height))
	return Qt;
      return Qnil;
    }
  else
    {
      if (posint > BUF_Z (buf))
	return Qnil;

      /* If that info is not correct, calculate afresh */
      posval = *compute_motion (top, 0, 0, posint, height, 0,
				XFASTINT (w->width) - 1
				- (XFASTINT (w->width) + XFASTINT (w->left)
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				   != FRAME_WIDTH (XFRAME (w->frame))),
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				XINT (w->hscroll), 0);

      return posval.vpos < height ? Qt : Qnil;
    }
}

static struct window *
decode_window (window)
     register Lisp_Object window;
{
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  if (NILP (window))
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    return XWINDOW (selected_window);

  CHECK_WINDOW (window, 0);
  return XWINDOW (window);
}

DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
  "Return the buffer that WINDOW is displaying.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
  "Return the number of lines in WINDOW (including its mode line).")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->height;
}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
  "Return the number of columns in WINDOW.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);
  register int width = w->width;

  /* If this window does not end at the right margin,
     must deduct one column for the border */
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  if ((width + w->left) == FRAME_WIDTH (XFRAME (WINDOW_FRAME (w))))
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    return width;
  return width - 1;
}

DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
  "Return the number of columns by which WINDOW is scrolled from left margin.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->hscroll;
}

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
  "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
NCOL should be zero or positive.")
  (window, ncol)
     register Lisp_Object window, ncol;
{
  register struct window *w;

  CHECK_NUMBER (ncol, 1);
  if (XINT (ncol) < 0) XFASTINT (ncol) = 0;
  if (XFASTINT (ncol) >= (1 << (SHORTBITS - 1)))
    args_out_of_range (ncol, Qnil);
  w = decode_window (window);
  if (w->hscroll != ncol)
    clip_changed = 1;		/* Prevent redisplay shortcuts */
  w->hscroll = ncol;
  return ncol;
}

DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
  "Return a list of the edge coordinates of WINDOW.\n\
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\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
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RIGHT is one more than the rightmost column used by WINDOW,\n\
and BOTTOM is one more than the bottommost row used by WINDOW\n\
 and its mode-line.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  return Fcons (w->left, Fcons (w->top,
           Fcons (make_number (XFASTINT (w->left) + XFASTINT (w->width)),
		  Fcons (make_number (XFASTINT (w->top)
				      + XFASTINT (w->height)),
			 Qnil))));
}

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/* Test if the character at column *x, row *y is within window *w.
   If it is not, return 0;
   if it is in the window's text area,
      set *x and *y to its location relative to the upper left corner
         of the window, and
      return 1;
   if it is on the window's modeline, return 2;
   if it is on the border between the window and its right sibling,
      return 3.  */
static int
coordinates_in_window (w, x, y)
     register struct window *w;
     register int *x, *y;
{
  register int left = XINT (w->left);
  register int width = XINT (w->width);
  register int window_height = XINT (w->height);
  register int top = XFASTINT (w->top);

  if (   *x < left || *x >= left + width
      || *y < top  || *y >= top  + window_height)
    return 0;

  /* Is the character is the mode line?  */
  if (*y == top + window_height - 1
      && window_height > 1)	/* 1 line => minibuffer */
    return 2;
  
  /* Is the character in the right border?  */
  if (*x == left + width - 1
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      && left + width != FRAME_WIDTH (XFRAME (w->frame)))
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    return 3;

  *x -= left;
  *y -= top;
  return 1;
}

DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
  Scoordinates_in_window_p, 2, 2, 0,
  "Return non-nil if COORDINATES are in WINDOW.\n\
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COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
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measured in characters from the upper-left corner of the frame.\n\
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(0 .  0) denotes the character in the upper left corner of the\n\
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frame.\n\
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If COORDINATES are in the text portion of WINDOW,\n\
   the coordinates relative to the window are returned.\n\
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If they are in the mode line of WINDOW, `mode-line' is returned.\n\
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If they are on the border between WINDOW and its right sibling,\n\
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   `vertical-line' is returned.")
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  (coordinates, window)
     register Lisp_Object coordinates, window;
{
  int x, y;

  CHECK_WINDOW (window, 0);
  CHECK_CONS (coordinates, 1);
  x = XINT (Fcar (coordinates));
  y = XINT (Fcdr (coordinates));

  switch (coordinates_in_window (XWINDOW (window), &x, &y))
    {
    case 0:			/* NOT in window at all. */
      return Qnil;

    case 1:			/* In text part of window. */
      return Fcons (x, y);

    case 2:			/* In mode line of window. */
      return Qmode_line;
      
    case 3:			/* On right border of window.  */
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      return Qvertical_line;
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    default:
      abort ();
    }
}

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/* Find the window containing column x, row y, and return it as a
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   Lisp_Object.  If x, y is on the window's modeline, set *part
   to 1; if it is on the separating line between the window and its
   right sibling, set it to 2; otherwise set it to 0.  If there is no
   window under x, y return nil and leave *part unmodified.  */
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Lisp_Object
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window_from_coordinates (frame, x, y, part)
     FRAME_PTR frame;
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     int x, y;
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     int *part;
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{
  register Lisp_Object tem, first;

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  tem = first = FRAME_SELECTED_WINDOW (frame);
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  do
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    {
      int found = coordinates_in_window (XWINDOW (tem), &x, &y);

      if (found)
	{
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	  *part = found - 1;
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	  return tem;
	}

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      tem = Fnext_window (tem, Qt, Qlambda);
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    }
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  while (! EQ (tem, first));
  
  return Qnil;
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}

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DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
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  "Return window containing row ROW, column COLUMN on FRAME.\n\
If omitted, FRAME defaults to the currently selected frame.\n\
The top left corner of the frame is considered to be row 0,\n\
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column 0.")
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  (row, column, frame)
      Lisp_Object row, column, frame;
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{
  int part;

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#ifdef MULTI_FRAME
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  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
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  else
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    CHECK_LIVE_FRAME (frame, 2);
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#endif
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  CHECK_NUMBER (row, 0);
  CHECK_NUMBER (column, 1);
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  return window_from_coordinates (XFRAME (frame),
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				  XINT (row), XINT (column),
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				  &part);
}

DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
  "Return current value of point in WINDOW.\n\
For a nonselected window, this is the value point would have\n\
if that window were selected.\n\
\n\
Note that, when WINDOW is the selected window and its buffer\n\
is also currently selected, the value returned is the same as (point).\n\
It would be more strictly correct to return the `top-level' value\n\
of point, outside of any save-excursion forms.\n\
But that is hard to define.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  if (w == XWINDOW (selected_window)
      && current_buffer == XBUFFER (w->buffer))
    return Fpoint ();
  return Fmarker_position (w->pointm);
}

DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
  "Return position at which display currently starts in WINDOW.")
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 1, 0,
  "Return position at which display currently ends in WINDOW.")
  (window)
     Lisp_Object window;
{
  Lisp_Object value;
  struct window *w = decode_window (window);
  
  XSET (value, Lisp_Int,
	BUF_Z (current_buffer) - XFASTINT (w->window_end_pos));

  return value;
}

DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
  "Make point value in WINDOW be at position POS in WINDOW's buffer.")
  (window, pos)
     Lisp_Object window, pos;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  if (w == XWINDOW (selected_window))
    Fgoto_char (pos);
  else
    set_marker_restricted (w->pointm, pos, w->buffer);

  return pos;
}

DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
  "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
Optional third arg NOFORCE non-nil inhibits next redisplay\n\
from overriding motion of point in order to display at this exact start.")
  (window, pos, noforce)
     Lisp_Object window, pos, noforce;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  set_marker_restricted (w->start, pos, w->buffer);
  /* this is not right, but much easier than doing what is right. */
  w->start_at_line_beg = Qnil;
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  if (NILP (noforce))
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    w->force_start = Qt;
  w->update_mode_line = Qt;
  XFASTINT (w->last_modified) = 0;
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  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
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  return pos;
}

DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
       1, 1, 0,
  "Return WINDOW's dedicated object, usually t or nil.\n\
See also `set-window-buffer-dedicated'.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

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DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
       Sset_window_dedicated_p, 2, 2, 0,
  "Control whether WINDOW is dedicated to the buffer it displays.\n\
If it is dedicated, Emacs will not automatically change\n\
which buffer appears in it.\n\
The second argument is the new value for the dedication flag;\n\
non-nil means yes.")
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  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

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  if (NILP (arg))
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    w->dedicated = Qnil;
  else
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    w->dedicated = Qt;
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  return w->dedicated;
}

DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
       0, 1, 0,
  "Return the display-table that WINDOW is using.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->display_table;
}

/* Get the display table for use currently on window W.
   This is either W's display table or W's buffer's display table.
   Ignore the specified tables if they are not valid;
   if no valid table is specified, return 0.  */

struct Lisp_Vector *
window_display_table (w)
     struct window *w;
{
  Lisp_Object tem;
  tem = w->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = XBUFFER (w->buffer)->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = Vstandard_display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  return 0;
}

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DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
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  "Set WINDOW's display-table to TABLE.")
  (window, table)
     register Lisp_Object window, table;
{
  register struct window *w;
  register Lisp_Object z;	/* Return value. */

  w = decode_window (window);
  w->display_table = table;
  return table;
}

/* Record info on buffer window w is displaying
   when it is about to cease to display that buffer.  */
static
unshow_buffer (w)
     register struct window *w;
{
  Lisp_Object buf = w->buffer;

  if (XBUFFER (buf) != XMARKER (w->pointm)->buffer)
    abort ();

  if (w == XWINDOW (selected_window)
      || ! EQ (buf, XWINDOW (selected_window)->buffer))
    /* Do this except when the selected window's buffer
       is being removed from some other window.  */
    XBUFFER (buf)->last_window_start = marker_position (w->start);

  /* Point in the selected window's buffer
     is actually stored in that buffer, and the window's pointm isn't used.
     So don't clobber point in that buffer.  */
  if (! EQ (buf, XWINDOW (selected_window)->buffer))
    BUF_PT (XBUFFER (buf))
      = clip_to_bounds (BUF_BEGV (XBUFFER (buf)),
			marker_position (w->pointm),
			BUF_ZV (XBUFFER (buf)));
}

/* Put replacement into the window structure in place of old. */
static
replace_window (old, replacement)
     Lisp_Object old, replacement;
{
  register Lisp_Object tem;
  register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);

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  /* If OLD is its frame's root_window, then replacement is the new
     root_window for that frame.  */
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  if (old == FRAME_ROOT_WINDOW (XFRAME (o->frame)))
    FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
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  p->left = o->left;
  p->top = o->top;
  p->width = o->width;
  p->height = o->height;

  p->next = tem = o->next;
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  if (!NILP (tem))
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    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
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  if (!NILP (tem))
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    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;
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  if (!NILP (tem))
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    {
      if (EQ (XWINDOW (tem)->vchild, old))
	XWINDOW (tem)->vchild = replacement;
      if (EQ (XWINDOW (tem)->hchild, old))
	XWINDOW (tem)->hchild = replacement;
    }

/*** Here, if replacement is a vertical combination
and so is its new parent, we should make replacement's
children be children of that parent instead.  ***/
}

DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
  "Remove WINDOW from the display.  Default is selected window.")
  (window)
     register Lisp_Object window;
{
  register Lisp_Object tem, parent, sib;
  register struct window *p;
  register struct window *par;

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

  p = XWINDOW (window);
  parent = p->parent;
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  if (NILP (parent))
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    error ("Attempt to delete minibuffer or sole ordinary window");
  par = XWINDOW (parent);

  windows_or_buffers_changed++;

  if (EQ (window, selected_window))
    Fselect_window (Fnext_window (window, Qnil, Qnil));

  tem = p->buffer;
  /* tem is null for dummy parent windows
     (which have inferiors but not any contents themselves) */
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  if (!NILP (tem))
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    {
      unshow_buffer (p);
      unchain_marker (p->pointm);
      unchain_marker (p->start);
      p->buffer = Qnil;
    }

  tem = p->next;
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  if (!NILP (tem))
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    XWINDOW (tem)->prev = p->prev;

  tem = p->prev;
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  if (!NILP (tem))
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    XWINDOW (tem)->next = p->next;

  if (EQ (window, par->hchild))
    par->hchild = p->next;
  if (EQ (window, par->vchild))
    par->vchild = p->next;

  /* Find one of our siblings to give our space to.  */
  sib = p->prev;
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  if (NILP (sib))
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    {
      /* If p gives its space to its next sibling, that sibling needs
	 to have its top/left side pulled back to where p's is.
	 set_window_{height,width} will re-position the sibling's
	 children.  */
      sib = p->next;
      XFASTINT (XWINDOW (sib)->top) = p->top;
      XFASTINT (XWINDOW (sib)->left) = p->left;
    }

  /* Stretch that sibling.  */
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  if (!NILP (par->vchild))
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    set_window_height (sib,
		       XFASTINT (XWINDOW (sib)->height) + XFASTINT (p->height),
		       1);
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  if (!NILP (par->hchild))
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    set_window_width (sib,
		      XFASTINT (XWINDOW (sib)->width) + XFASTINT (p->width),
		      1);

  /* If parent now has only one child,
     put the child into the parent's place.  */

  tem = par->hchild;
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  if (NILP (tem))
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    tem = par->vchild;
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  if (NILP (XWINDOW (tem)->next))
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    replace_window (parent, tem);
  return Qnil;
}


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extern Lisp_Object next_frame (), prev_frame ();
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DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
  "Return next window after WINDOW in canonical ordering of windows.\n\
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If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
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Several frames may share a single minibuffer; if the minibuffer\n\
counts, all windows on all frames that share that minibuffer count\n\
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too.  This means that next-window may be used to iterate through the\n\
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set of windows even when the minibuffer is on another frame.  If the\n\
minibuffer does not count, only windows from WINDOW's frame count.\n\
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\n\
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Optional third arg ALL-FRAMES t means include windows on all frames.\n\
ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
above.  If neither nil nor t, restrict to WINDOW's frame.")
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
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{
  register Lisp_Object tem;
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  Lisp_Object start_window;
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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

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  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
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  if (NILP (minibuf))
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    minibuf = (minibuf_level ? Qt : Qlambda);

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  /* all_frames == nil doesn't specify which frames to include.
     Decide which frames it includes.  */
  if (NILP (all_frames))
    all_frames = (EQ (minibuf, Qt)
		   ? (FRAME_MINIBUF_WINDOW
		      (XFRAME
		       (WINDOW_FRAME
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			(XWINDOW (window)))))
		   : Qnil);
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  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
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  /* Do this loop at least once, to get the next window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a next one.  This loop
	 climbs up the tree.  */
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      while (tem = XWINDOW (window)->next, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
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	  window = tem;
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	else
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	  {
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	    /* We've reached the end of this frame.
	       Which other frames are acceptable?  */
	    tem = WINDOW_FRAME (XWINDOW (window));
#ifdef MULTI_FRAME
	    if (! NILP (all_frames))
	      tem = next_frame (tem, all_frames);
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#endif
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	    tem = FRAME_ROOT_WINDOW (XFRAME (tem));
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	    break;
	  }

      window = tem;
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      /* If we're in a combination window, find its first child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
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	  if (!NILP (XWINDOW (window)->hchild))
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	    window = XWINDOW (window)->hchild;
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	  else if (!NILP (XWINDOW (window)->vchild))
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	    window = XWINDOW (window)->vchild;
	  else break;
	}
    }
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  /* Which windows are acceptible?
     Exit the loop and accept this window if
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     this isn't a minibuffer window, or
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     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
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  while (MINI_WINDOW_P (XWINDOW (window))
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	 && ! EQ (minibuf, Qt)
	 && window != start_window);
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  return window;
}

DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
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  "Return the window preceeding WINDOW in canonical ordering of windows.\n\
If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
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Several frames may share a single minibuffer; if the minibuffer\n\
counts, all windows on all frames that share that minibuffer count\n\
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too.  This means that previous-window may be used to iterate through\n\
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the set of windows even when the minibuffer is on another frame.  If\n\
the minibuffer does not count, only windows from WINDOW's frame\n\
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count.\n\
\n\
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Optional third arg ALL-FRAMES t means include windows on all frames.\n\
ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
above.  If neither nil nor t, restrict to WINDOW's frame.")
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
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{
  register Lisp_Object tem;
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  Lisp_Object start_window;
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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

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  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
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  if (NILP (minibuf))
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    minibuf = (minibuf_level ? Qt : Qlambda);

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  /* all_frames == nil doesn't specify which frames to include.
     Decide which frames it includes.  */
  if (NILP (all_frames))
    all_frames = (EQ (minibuf, Qt)
		   ? (FRAME_MINIBUF_WINDOW
		      (XFRAME
		       (WINDOW_FRAME
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			(XWINDOW (window)))))
		   : Qnil);
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  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
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  /* Do this loop at least once, to get the previous window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a previous one.  This loop
	 climbs up the tree.  */
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      while (tem = XWINDOW (window)->prev, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
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	  window = tem;
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	else
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	  {
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	    /* We have found the top window on the frame.
	       Which frames are acceptable?  */
	    tem = WINDOW_FRAME (XWINDOW (window));
#ifdef MULTI_FRAME
	    if (! NILP (all_frames))
	      tem = next_frame (tem, all_frames);
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#endif
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	    tem = FRAME_ROOT_WINDOW (XFRAME (tem));
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	    break;
	  }

      window = tem;
      /* If we're in a combination window, find its last child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
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	  if (!NILP (XWINDOW (window)->hchild))
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	    window = XWINDOW (window)->hchild;
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	  else if (!NILP (XWINDOW (window)->vchild))
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	    window = XWINDOW (window)->vchild;
	  else break;
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	  while (tem = XWINDOW (window)->next, !NILP (tem))
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	    window = tem;
	}
    }
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  /* Which windows are acceptable?
     Exit the loop and accept this window if
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     this isn't a minibuffer window, or
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     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
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  while (MINI_WINDOW_P (XWINDOW (window))
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	 && !EQ (minibuf, Qt)
	 && window != start_window);
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  return window;
}

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DEFUN ("other-window", Fother_window, Sother_window, 1, 2, "p",
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  "Select the ARG'th different window on this frame.\n\
All windows on current frame are arranged in a cyclic order.\n\
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This command selects the window ARG steps away in that order.\n\
A negative ARG moves in the opposite order.  If the optional second\n\
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argument ALL_FRAMES is non-nil, cycle through all frames.")
  (n, all_frames)
     register Lisp_Object n, all_frames;
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{
  register int i;
  register Lisp_Object w;

  CHECK_NUMBER (n, 0);
  w = selected_window;
  i = XINT (n);

  while (i > 0)
    {
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      w = Fnext_window (w, Qnil, all_frames);
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      i--;
    }
  while (i < 0)
    {
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      w = Fprevious_window (w, Qnil, all_frames);
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      i++;
    }
  Fselect_window (w);
  return Qnil;
}

/* Look at all windows, performing an operation specified by TYPE
   with argument OBJ.
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   If FRAMES is Qt, look at all frames, if Qnil, look at just the selected
   frame.  If FRAMES is a frame, just look at windows on that frame.
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   If MINI is non-zero, perform the operation on minibuffer windows too.
*/

enum window_loop
{
  WINDOW_LOOP_UNUSED,
  GET_BUFFER_WINDOW,		/* Arg is buffer */
  GET_LRU_WINDOW,		/* Arg is t for full-width windows only */
  DELETE_OTHER_WINDOWS,		/* Arg is window not to delete */
  DELETE_BUFFER_WINDOWS,	/* Arg is buffer */
  GET_LARGEST_WINDOW,
  UNSHOW_BUFFER,		/* Arg is buffer */
};

static Lisp_Object
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window_loop (type, obj, mini, frames)
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     enum window_loop type;
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     register Lisp_Object obj, frames;
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     int mini;
{
  register Lisp_Object w;
  register Lisp_Object best_window;
  register Lisp_Object next_window;
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  register Lisp_Object last_window;
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  FRAME_PTR frame;

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#ifdef MULTI_FRAME
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  /* If we're only looping through windows on a particular frame,
     frame points to that frame.  If we're looping through windows
     on all frames, frame is 0.  */
  if (FRAMEP (frames))
    frame = XFRAME (frames);
  else if (NILP (frames))
    frame = selected_frame;
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  else
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    frame = 0;
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#else
  frame = 0;
#endif
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  /* Pick a window to start with.  */
  if (XTYPE (obj) == Lisp_Window)
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    w = obj;
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  else if (frame)
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    w = FRAME_SELECTED_WINDOW (frame);
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  else
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    w = FRAME_SELECTED_WINDOW (selected_frame);

  /* Figure out the last window we're going to mess with.  Since
     Fnext_window, given the same options, is guaranteed to go in a
     ring, we can just use Fprevious_window to find the last one.

     We can't just wait until we hit the first window again, because
     it might be deleted.  */

#ifdef MULTI_FRAME
  if (frame)
    last_window = Fprevious_window (w, (mini ? Qt : Qnil), Qlambda);
  else
#endif	/* MULTI_FRAME */
    /* We know frame is 0, so we're looping through all frames.
       Or we know this isn't a MULTI_FRAME Emacs, so who cares?  */
    last_window = Fprevious_window (w, mini ? Qt : Qnil, Qt);
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  best_window = Qnil;
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  for (;;)
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    {
      /* Pick the next window now, since some operations will delete
	 the current window.  */
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#ifdef MULTI_FRAME
      if (frame)
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	next_window = Fnext_window (w, (mini ? Qt : Qnil), Qlambda);
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      else
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#endif				/* MULTI_FRAME */
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	/* We know frame is 0, so we're looping through all frames.
	   Or we know this isn't a MULTI_FRAME Emacs, so who cares?  */
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	next_window = Fnext_window (w, mini ? Qt : Qnil, Qt);

      if (!MINI_WINDOW_P (XWINDOW (w))
	  || (mini && minibuf_level > 0))
	switch (type)
	  {
	  case GET_BUFFER_WINDOW:
#if 0
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	    /* Ignore invisible and iconified frames.  */
	    if (! FRAME_VISIBLE_P (XFRAME (WINDOW_FRAME (XWINDOW (w))))
		|| FRAME_ICONIFIED_P (XFRAME (WINDOW_FRAME (XWINDOW (w)))))
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	      break;
#endif
	    if (XBUFFER (XWINDOW (w)->buffer) == XBUFFER (obj))
	      return w;
	    break;

	  case GET_LRU_WINDOW:
	    /* t as arg means consider only full-width windows */
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	    if (!NILP (obj) && XFASTINT (XWINDOW (w)->width)
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		!= FRAME_WIDTH (frame))
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	      break;
#if 0
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	    /* Ignore invisible and iconified frames.  */
	    if (! FRAME_VISIBLE_P (XFRAME (WINDOW_FRAME (XWINDOW (w))))
		|| FRAME_ICONIFIED_P (XFRAME (WINDOW_FRAME (XWINDOW (w)))))
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	      break;
#endif
	    /* Ignore dedicated windows and minibuffers.  */
	    if (MINI_WINDOW_P (XWINDOW (w))
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		|| !NILP (XWINDOW (w)->dedicated))
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	      break;
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	    if (NILP (best_window)
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		|| (XFASTINT (XWINDOW (best_window)->use_time)
		    > XFASTINT (XWINDOW (w)->use_time)))
	      best_window = w;
	    break;

	  case DELETE_OTHER_WINDOWS:
	    if (XWINDOW (w) != XWINDOW (obj))
	      Fdelete_window (w);
	    break;

	  case DELETE_BUFFER_WINDOWS:
	    if (EQ (XWINDOW (w)->buffer, obj))
	      {
		/* If we're deleting the buffer displayed in the only window
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		   on the frame, find a new buffer to display there.  */
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		if (NILP (XWINDOW (w)->parent))
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		  {
		    Lisp_Object new_buffer = Fother_buffer (obj);
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		    if (NILP (new_buffer))
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		      new_buffer
			= Fget_buffer_create (build_string ("*scratch*"));
		    Fset_window_buffer (w, new_buffer);
		    Fset_buffer (XWINDOW (w)->buffer);
		  }
		else
		  Fdelete_window (w);
	      }
	    break;

	  case GET_LARGEST_WINDOW:
#if 0
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	    /* Ignore invisible and iconified frames.  */
	    if (! FRAME_VISIBLE_P (XFRAME (WINDOW_FRAME (XWINDOW (w))))
		|| FRAME_ICONIFIED_P (XFRAME (WINDOW_FRAME (XWINDOW (w)))))
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	      break;
#endif
	    /* Ignore dedicated windows and minibuffers.  */
	    if (MINI_WINDOW_P (XWINDOW (w))
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		|| !NILP (XWINDOW (w)->dedicated))
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	      break;
	    {
	      struct window *best_window_ptr = XWINDOW (best_window);
	      struct window *w_ptr = XWINDOW (w);
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	      if (NILP (best_window) ||
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		  (XFASTINT (w_ptr->height) * XFASTINT (w_ptr->width))
		  > (XFASTINT (best_window_ptr->height)
		     * XFASTINT (best_window_ptr->width)))
		best_window = w;
	    }
	    break;

	  case UNSHOW_BUFFER:
	    if (EQ (XWINDOW (w)->buffer, obj))
	      {
		/* Find another buffer to show in this window.  */
		Lisp_Object another_buffer = Fother_buffer (obj);
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		if (NILP (another_buffer))
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		  another_buffer
		    = Fget_buffer_create (build_string ("*scratch*"));
		Fset_window_buffer (w, another_buffer);
		if (EQ (w, selected_window))
		  Fset_buffer (XWINDOW (w)->buffer);
	      }
	    break;
	  }
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      if (EQ (w, last_window))
	break;

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      w = next_window;
    }

  return best_window;
}     

DEFUN ("get-lru-window", Fget_lru_window, Sget_lru_window, 0, 1, 0,
  "Return the window least recently selected or used for display.\n\
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If optional argument FRAMES is t, search all frames.  If FRAME is a\n\
frame, search only that frame.\n")
  (frames)
    Lisp_Object frames;
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{
  register Lisp_Object w;
  /* First try for a window that is full-width */
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  w = window_loop (GET_LRU_WINDOW, Qt, 0, frames);
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  if (!NILP (w) && !EQ (w, selected_window))
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    return w;
  /* If none of them, try the rest */
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  return window_loop (GET_LRU_WINDOW, Qnil, 0, frames);
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}

DEFUN ("get-largest-window", Fget_largest_window, Sget_largest_window, 0, 1, 0,
  "Return the largest window in area.\n\
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If optional argument FRAMES is t, search all frames.  If FRAME is a\n\
frame, search only that frame.\n")
  (frame)
    Lisp_Object frame;
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{
  return window_loop (GET_LARGEST_WINDOW, Qnil, 0,
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		      frame);
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}

DEFUN ("get-buffer-window", Fget_buffer_window, Sget_buffer_window, 1, 2, 0,
  "Return a window currently displaying BUFFER, or nil if none.\n\
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If optional argument FRAMES is t, search all frames.  If FRAME is a\n\
frame, search only that frame.\n")
  (buffer, frame)
    Lisp_Object buffer, frame;
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{
  buffer = Fget_buffer (buffer);
  if (XTYPE (buffer) == Lisp_Buffer)
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    return window_loop (GET_BUFFER_WINDOW, buffer, 1, frame);
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  else
    return Qnil;
}

DEFUN ("delete-other-windows", Fdelete_other_windows, Sdelete_other_windows,
  0, 1, "",
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  "Make WINDOW (or the selected window) fill its frame.\n\
Only the frame WINDOW is on is affected.")
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  (window)
     Lisp_Object window;
{
  struct window *w;
  int opoint = point;
  struct buffer *obuf = current_buffer;
  int top;

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

  w = XWINDOW (window);
  top = XFASTINT (w->top);

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  window_loop (DELETE_OTHER_WINDOWS, window, 0, WINDOW_FRAME(w));
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  Fset_buffer (w->buffer);
  SET_PT (marker_position (w->start));
  Frecenter (make_number (top));

  set_buffer_internal (obuf);
  SET_PT (opoint);
  return Qnil;
}

DEFUN ("delete-windows-on", Fdelete_windows_on, Sdelete_windows_on,
  1, 1, "bDelete windows on (buffer): ",
  "Delete all windows showing BUFFER.")
  (buffer)
     Lisp_Object buffer;
{
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  if (!NILP (buffer))
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    {
      buffer = Fget_buffer (buffer);
      CHECK_BUFFER (buffer, 0);
      window_loop (DELETE_BUFFER_WINDOWS, buffer, 0, Qt);
    }
  return Qnil;
}

DEFUN ("replace-buffer-in-windows", Freplace_buffer_in_windows,
  Sreplace_buffer_in_windows,
  1, 1, "bReplace buffer in windows: ",
  "Replace BUFFER with some other buffer in all windows showing it.")
  (buffer)
     Lisp_Object buffer;
{
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  if (!NILP (buffer))
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    {
      buffer = Fget_buffer (buffer);
      CHECK_BUFFER (buffer, 0);
      window_loop (UNSHOW_BUFFER, buffer, 0, Qt);
    }
  return Qnil;
}

/* Set the height of WINDOW and all its inferiors.  */
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/* The smallest acceptable dimensions for a window.  Anything smaller
   might crash Emacs.  */
#define MIN_SAFE_WINDOW_WIDTH  (2)
#define MIN_SAFE_WINDOW_HEIGHT (2)

/* Make sure that window_min_height and window_min_width are
   not too small; if they are, set them to safe minima.  */

static void
check_min_window_sizes ()
{
  /* Smaller values might permit a crash.  */
  if (window_min_width < MIN_SAFE_WINDOW_WIDTH)
    window_min_width = MIN_SAFE_WINDOW_WIDTH;
  if (window_min_height < MIN_SAFE_WINDOW_HEIGHT)
    window_min_height = MIN_SAFE_WINDOW_HEIGHT;
}

/* If *ROWS or *COLS are too small a size for FRAME, set them to the
   minimum allowable size.  */
extern void
check_frame_size (frame, rows, cols)
FRAME_PTR frame;
int *rows, *cols;
{
  /* For height, we have to see whether the frame has a minibuffer, and
     whether it wants a mode line.  */
  int min_height =
    ((FRAME_MINIBUF_ONLY_P (frame)
      || ! FRAME_HAS_MINIBUF_P (frame))
     ? MIN_SAFE_WINDOW_HEIGHT
     : 2 * MIN_SAFE_WINDOW_HEIGHT - 1);

  if (*rows < min_height)
    *rows = min_height;
  if (*cols  < MIN_SAFE_WINDOW_WIDTH)
    *cols = MIN_SAFE_WINDOW_WIDTH;
}

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/* Normally the window is deleted if it gets too small.
   nodelete nonzero means do not do this.
   (The caller should check later and do so if appropriate)  */

set_window_height (window, height, nodelete)
     Lisp_Object window;
     int height;
     int nodelete;
{
  register struct window *w = XWINDOW (window);
  register struct window *c;
  int oheight = XFASTINT (w->height);
  int top, pos, lastbot, opos, lastobot;
  Lisp_Object child;

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  check_min_window_sizes ();

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  if (!nodelete
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      && ! NILP (w->parent)
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      && height < window_min_height)
    {
      Fdelete_window (window);
      return;
    }

  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  XFASTINT (w->height) = height;
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  if (!NILP (w->hchild))
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    {
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      for (child = w->hchild; !NILP (child); child = XWINDOW (child)->next)
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	{
	  XWINDOW (child)->top = w->top;
	  set_window_height (child, height, nodelete);
	}
    }
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  else if (!NILP (w->vchild))
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    {
      lastbot = top = XFASTINT (w->top);
      lastobot = 0;
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      for (child = w->vchild; !NILP (child); child = c->next)
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	{
	  c = XWINDOW (child);

	  opos = lastobot + XFASTINT (c->height);

	  XFASTINT (c->top) = lastbot;

	  pos = (((opos * height) << 1) + oheight) / (oheight << 1);

	  /* Avoid confusion: inhibit deletion of child if becomes too small */
	  set_window_height (child, pos + top - lastbot, 1);

	  /* Now advance child to next window,
	     and set lastbot if child was not just deleted.  */
	  lastbot = pos + top;
	  lastobot = opos;
	}
      /* Now delete any children that became too small.  */
      if (!nodelete)
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	for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
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	  {
	    set_window_height (child, XINT (XWINDOW (child)->height), 0);
	  }
    }
}

/* Recursively set width of WINDOW and its inferiors. */

set_window_width (window, width, nodelete)
     Lisp_Object window;
     int width;
     int nodelete;
{
  register struct window *w = XWINDOW (window);
  register struct window *c;
  int owidth = XFASTINT (w->width);
  int left, pos, lastright, opos, lastoright;
  Lisp_Object child;

  if (!nodelete && width < window_min_width)
    {
      Fdelete_window (window);
      return;
    }

  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  XFASTINT (w->width) = width;
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  if (!NILP (w->vchild))
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    {
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      for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
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	{
	  XWINDOW (child)->left = w->left;
	  set_window_width (child, width, nodelete);
	}
    }
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  else if (!NILP (w->hchild))
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    {
      lastright = left = XFASTINT (w->left);
      lastoright = 0;
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      for (child = w->hchild; !NILP (child); child = c->next)
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	{
	  c = XWINDOW (child);

	  opos = lastoright + XFASTINT (c->width);

	  XFASTINT (c->left) = lastright;

	  pos = (((opos * width) << 1) + owidth) / (owidth << 1);

	  /* Inhibit deletion for becoming too small */
	  set_window_width (child, pos + left - lastright, 1);

	  /* Now advance child to next window,
	     and set lastright if child was not just deleted.  */
	  lastright = pos + left, lastoright = opos;
	}
      /* Delete children that became too small */
      if (!nodelete)
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	for (child = w->hchild; !NILP (child); child = XWINDOW (child)->next)
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	  {
	    set_window_width (child, XINT (XWINDOW (child)->width), 0);
	  }
    }
}

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int window_select_count;
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DEFUN ("set-window-buffer", Fset_window_buffer, Sset_window_buffer, 2, 2, 0,
  "Make WINDOW display BUFFER as its contents.\n\
BUFFER can be a buffer or buffer name.")
  (window, buffer)
     register Lisp_Object window, buffer;
{
  register Lisp_Object tem;
  register struct window *w = decode_window (window);

  buffer = Fget_buffer (buffer);
  CHECK_BUFFER (buffer, 1);

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  if (NILP (XBUFFER (buffer)->name))
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    error ("Attempt to display deleted buffer");

  tem = w->buffer;
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  if (NILP (tem))
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    error ("Window is deleted");
  else if (! EQ (tem, Qt))	/* w->buffer is t when the window
				   is first being set up.  */
    {
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      if (!NILP (w->dedicated) && !EQ (tem, buffer))
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	error ("Window is dedicated to %s\n", tem);

      unshow_buffer (w);
    }

  w->buffer = buffer;
  Fset_marker (w->pointm,
	       make_number (BUF_PT (XBUFFER (buffer))),
	       buffer);
  set_marker_restricted (w->start,
			 make_number (XBUFFER (buffer)->last_window_start),
			 buffer);
  w->start_at_line_beg = Qnil;
  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  if (EQ (window, selected_window))
    Fset_buffer (buffer);

  return Qnil;
}

DEFUN ("select-window", Fselect_window, Sselect_window, 1, 1, 0,
  "Select WINDOW.  Most editing will apply to WINDOW's buffer.\n\
The main editor command loop selects the buffer of the selected window\n\
before each command.")
  (window)
     register Lisp_Object window;
{
  register struct window *w;
  register struct window *ow = XWINDOW (selected_window);

  CHECK_WINDOW (window, 0);

  w = XWINDOW (window);

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  if (NILP (w->buffer))
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    error ("Trying to select deleted window or non-leaf window");

  XFASTINT (w->use_time) = ++window_select_count;
  if (EQ (window, selected_window))
    return window;

  Fset_marker (ow->pointm, make_number (BUF_PT (XBUFFER (ow->buffer))),
	       ow->buffer);

  selected_window = window;
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#ifdef MULTI_FRAME
  if (XFRAME (WINDOW_FRAME (w)) != selected_frame)
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    {
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      XFRAME (WINDOW_FRAME (w))->selected_window = window;
      Fselect_frame (WINDOW_FRAME (w), Qnil);
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    }
  else
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    selected_frame->selected_window = window;
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#endif

  record_buffer (w->buffer);
  Fset_buffer (w->buffer);

  /* Go to the point recorded in the window.
     This is important when the buffer is in more
     than one window.  It also matters when
     redisplay_window has altered point after scrolling,
     because it makes the change only in the window.  */
  {
    register int new_point = marker_position (w->pointm);
    if (new_point < BEGV)
      SET_PT (BEGV);
    if (new_point > ZV)
      SET_PT (ZV);
    else
      SET_PT (new_point);
  }

  windows_or_buffers_changed++;
  return window;
}

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DEFUN ("display-buffer", Fdisplay_buffer, Sdisplay_buffer, 1, 2,
       "BDisplay buffer:\nP",
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  "Make BUFFER appear in some window but don't select it.\n\
BUFFER can be a buffer or a buffer name.\n\
If BUFFER is shown already in some window, just use that one,\n\
unless the window is the selected window and the optional second\n\
argument NOT_THIS_WINDOW is non-nil.\n\
Returns the window displaying BUFFER.")
  (buffer, not_this_window)
     register Lisp_Object buffer, not_this_window;
{
  register Lisp_Object window;

  buffer = Fget_buffer (buffer);
  CHECK_BUFFER (buffer, 0);

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  if (!NILP (Vdisplay_buffer_function))
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    return call2 (Vdisplay_buffer_function, buffer, not_this_window);

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  if (NILP (not_this_window)
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      && XBUFFER (XWINDOW (selected_window)->buffer) == XBUFFER (buffer))
    return selected_window;

  window = Fget_buffer_window (buffer, Qnil);
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  if (!NILP (window)
      && (NILP (not_this_window) || !EQ (window, selected_window)))
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    return window;

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#ifdef MULTI_FRAME
  /* If there are no frames open that have more than a minibuffer,
     we need to create a new frame.  */
  if (pop_up_frames || last_nonminibuf_frame == 0)
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    {
      window
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	= Fframe_selected_window (call0 (Vpop_up_frame_function));
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      Fset_window_buffer (window, buffer);
#if 0
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      Fselect_frame (XWINDOW (window)->frame, Qnil);
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#endif
      return window;
    }
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#endif /* MULTI_FRAME */
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  if (pop_up_windows
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#ifdef MULTI_FRAME
      || FRAME_MINIBUF_ONLY_P (selected_frame)
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#endif
      )
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    {
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      Lisp_Object frames = Qnil;
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#ifdef MULTI_FRAME
      if (FRAME_MINIBUF_ONLY_P (selected_frame))
	XSET (frames, Lisp_Frame, last_nonminibuf_frame);
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