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/* MS-DOS specific C utilities.          -*- coding: raw-text -*-
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   Copyright (C) 1993, 1994, 1995, 1996, 1997 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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/* Contributed by Morten Welinder */
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/* New display, keyboard, and mouse control by Kim F. Storm */
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/* Note: some of the stuff here was taken from end of sysdep.c in demacs. */

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#include <config.h>
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#ifdef MSDOS
#include "lisp.h"
#include <stdio.h>
#include <stdlib.h>
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#include <time.h>
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#include <sys/param.h>
#include <sys/time.h>
#include <dos.h>
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#include <errno.h>
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#include <string.h>	 /* for bzero and string functions */
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#include <sys/stat.h>    /* for _fixpath */
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#include <unistd.h>	 /* for chdir, dup, dup2, etc. */
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#if __DJGPP__ >= 2
#include <fcntl.h>
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#include <io.h>		 /* for setmode */
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#include <dpmi.h>	 /* for __dpmi_xxx stuff */
#include <sys/farptr.h>	 /* for _farsetsel, _farnspokeb */
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#include <libc/dosio.h>  /* for _USE_LFN */
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#include <conio.h>	 /* for cputs */
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#endif

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#include "msdos.h"
#include "systime.h"
#include "termhooks.h"
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#include "termchar.h"
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#include "dispextern.h"
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#include "dosfns.h"
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#include "termopts.h"
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#include "charset.h"
#include "coding.h"
#include "disptab.h"
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#include "frame.h"
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#include "window.h"
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#include "buffer.h"
#include "commands.h"
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#include <go32.h>
#include <pc.h>
#include <ctype.h>
/* #include <process.h> */
/* Damn that local process.h!  Instead we can define P_WAIT ourselves.  */
#define P_WAIT 1

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#ifndef _USE_LFN
#define _USE_LFN 0
#endif

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#ifndef _dos_ds
#define _dos_ds _go32_info_block.selector_for_linear_memory
#endif

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#if __DJGPP__ > 1

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#include <signal.h>
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#include "syssignal.h"
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#ifndef SYSTEM_MALLOC

#ifdef GNU_MALLOC

/* If other `malloc' than ours is used, force our `sbrk' behave like
   Unix programs expect (resize memory blocks to keep them contiguous).
   If `sbrk' from `ralloc.c' is NOT used, also zero-out sbrk'ed memory,
   because that's what `gmalloc' expects to get.  */
#include <crt0.h>

#ifdef REL_ALLOC
int _crt0_startup_flags = _CRT0_FLAG_UNIX_SBRK;
#else  /* not REL_ALLOC */
int _crt0_startup_flags = (_CRT0_FLAG_UNIX_SBRK | _CRT0_FLAG_FILL_SBRK_MEMORY);
#endif /* not REL_ALLOC */
#endif /* GNU_MALLOC */

#endif /* not SYSTEM_MALLOC */
#endif /* __DJGPP__ > 1 */
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static unsigned long
event_timestamp ()
{
  struct time t;
  unsigned long s;
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  gettime (&t);
  s = t.ti_min;
  s *= 60;
  s += t.ti_sec;
  s *= 1000;
  s += t.ti_hund * 10;
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  return s;
}

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/* ------------------------ Mouse control ---------------------------
 *
 * Coordinates are in screen positions and zero based.
 * Mouse buttons are numbered from left to right and also zero based.
 */
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int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;
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static int mouse_last_x;
static int mouse_last_y;
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static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;
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void
mouse_on ()
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{
  union REGS regs;

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  if (have_mouse > 0 && !mouse_visible)
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    {
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      if (termscript)
	fprintf (termscript, "<M_ON>");
      regs.x.ax = 0x0001;
      int86 (0x33, &regs, &regs);
      mouse_visible = 1;
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    }
}

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void
mouse_off ()
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{
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  union REGS regs;
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  if (have_mouse > 0 && mouse_visible)
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    {
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      if (termscript)
	fprintf (termscript, "<M_OFF>");
      regs.x.ax = 0x0002;
      int86 (0x33, &regs, &regs);
      mouse_visible = 0;
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    }
}

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static void
mouse_get_xy (int *x, int *y)
{
  union REGS regs;

  regs.x.ax = 0x0003;
  int86 (0x33, &regs, &regs);
  *x = regs.x.cx / 8;
  *y = regs.x.dx / 8;
}

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void
mouse_moveto (x, y)
     int x, y;
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{
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  union REGS regs;
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  if (termscript)
    fprintf (termscript, "<M_XY=%dx%d>", x, y);
  regs.x.ax = 0x0004;
  mouse_last_x = regs.x.cx = x * 8;
  mouse_last_y = regs.x.dx = y * 8;
  int86 (0x33, &regs, &regs);
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}

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static int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
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{
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  union REGS regs;
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  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 0x0005;
  regs.x.bx = mouse_button_translate[b];
  int86 (0x33, &regs, &regs);
  if (regs.x.bx)
    *xp = regs.x.cx / 8, *yp = regs.x.dx / 8;
  return (regs.x.bx != 0);
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}

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static int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
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{
  union REGS regs;

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  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 0x0006;
  regs.x.bx = mouse_button_translate[b];
  int86 (0x33, &regs, &regs);
  if (regs.x.bx)
    *xp = regs.x.cx / 8, *yp = regs.x.dx / 8;
  return (regs.x.bx != 0);
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}

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static int
mouse_button_depressed (b, xp, yp)
     int b, *xp, *yp;
{
  union REGS regs;

  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 0x0003;
  int86 (0x33, &regs, &regs);
  if ((regs.x.bx & (1 << mouse_button_translate[b])) != 0)
    {
      *xp = regs.x.cx / 8;
      *yp = regs.x.dx / 8;
      return 1;
    }
  return 0;
}

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void
mouse_get_pos (f, insist, bar_window, part, x, y, time)
     FRAME_PTR *f;
     int insist;
     Lisp_Object *bar_window, *x, *y;
     enum scroll_bar_part *part;
     unsigned long *time;
{
  int ix, iy;
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  Lisp_Object frame, tail;

  /* Clear the mouse-moved flag for every frame on this display.  */
  FOR_EACH_FRAME (tail, frame)
    XFRAME (frame)->mouse_moved = 0;
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  *f = selected_frame;
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
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  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
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}
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static void
mouse_check_moved ()
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{
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  int x, y;
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  mouse_get_xy (&x, &y);
  selected_frame->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
  mouse_last_x = x;
  mouse_last_y = y;
}
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void
mouse_init ()
{
  union REGS regs;
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  int b;
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  if (termscript)
    fprintf (termscript, "<M_INIT>");
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  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
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  /* Reset the mouse last press/release info.  It seems that Windows
     doesn't do that automatically when function 21h is called, which
     causes Emacs to ``remember'' the click that switched focus to the
     window just before Emacs was started from that window.  */
  for (b = 0; b < mouse_button_count; b++)
    {
      int dummy_x, dummy_y;

      (void) mouse_pressed (b, &dummy_x, &dummy_y);
      (void) mouse_released (b, &dummy_x, &dummy_y);
    }

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  regs.x.ax = 0x0007;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenCols () - 1);
  int86 (0x33, &regs, &regs);
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  regs.x.ax = 0x0008;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenRows () - 1);
  int86 (0x33, &regs, &regs);
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  mouse_moveto (0, 0);
  mouse_visible = 0;
}
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/* ------------------------- Screen control ----------------------
 *
 */
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static int internal_terminal = 0;
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#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;
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static int screen_size_X;
static int screen_size_Y;
static int screen_size;
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static int current_pos_X;
static int current_pos_Y;
static int new_pos_X;
static int new_pos_Y;
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static void *startup_screen_buffer;
static int startup_screen_size_X;
static int startup_screen_size_Y;
static int startup_pos_X;
static int startup_pos_Y;
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static unsigned char startup_screen_attrib;
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static clock_t startup_time;

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static int term_setup_done;
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/* Similar to the_only_frame.  */
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struct x_output the_only_x_display;
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/* This is never dereferenced.  */
Display *x_current_display;
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/* Support for DOS/V (allows Japanese characters to be displayed on
   standard, non-Japanese, ATs).  Only supported for DJGPP v2 and later.  */

/* Holds the address of the text-mode screen buffer.  */
static unsigned long screen_old_address = 0;
/* Segment and offset of the virtual screen.  If 0, DOS/V is NOT loaded.  */
static unsigned short screen_virtual_segment = 0;
static unsigned short screen_virtual_offset = 0;
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/* A flag to control how to display unibyte 8-bit characters.  */
extern int unibyte_display_via_language_environment;
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#if __DJGPP__ > 1
/* Update the screen from a part of relocated DOS/V screen buffer which
   begins at OFFSET and includes COUNT characters.  */
static void
dosv_refresh_virtual_screen (int offset, int count)
{
  __dpmi_regs regs;

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  if (offset < 0 || count < 0)	/* paranoia; illegal values crash DOS/V */
    return;

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  regs.h.ah = 0xff;	/* update relocated screen */
  regs.x.es = screen_virtual_segment;
  regs.x.di = screen_virtual_offset + offset;
  regs.x.cx = count;
  __dpmi_int (0x10, &regs);
}
#endif

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static void
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dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
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{
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  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
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  int l0 = len;
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#if (__DJGPP__ < 2)
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  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
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#else
  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
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  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
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#endif
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}
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#endif
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/* Flash the screen as a substitute for BEEPs.  */

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#if (__DJGPP__ < 2)
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static void
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do_visible_bell (xorattr)
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     unsigned char xorattr;
{
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  asm volatile
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    ("  movb   $1,%%dl
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visible_bell_0:
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	movl   _ScreenPrimary,%%eax
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	call   dosmemsetup
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	movl   %%eax,%%ebx
	movl   %1,%%ecx
	movb   %0,%%al
	incl   %%ebx
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visible_bell_1:
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	xorb   %%al,%%gs:(%%ebx)
	addl   $2,%%ebx
	decl   %%ecx
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	jne    visible_bell_1
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	decb   %%dl
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	jne    visible_bell_3
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visible_bell_2:
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	movzwl %%ax,%%eax
        movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	decw   %%cx
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	jne    visible_bell_2
	jmp    visible_bell_0
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visible_bell_3:"
     : /* no output */
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     : "m" (xorattr), "g" (screen_size)
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     : "%eax", "%ebx", /* "%gs",*/ "%ecx", "%edx");
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}

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static void
ScreenVisualBell (void)
{
  /* This creates an xor-mask that will swap the default fore- and
     background colors.  */
  do_visible_bell (((the_only_x_display.foreground_pixel
		     ^ the_only_x_display.background_pixel)
		    * 0x11) & 0x7f);
}
#endif

#ifndef HAVE_X_WINDOWS

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static int blink_bit = -1;	/* the state of the blink bit at startup */

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/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

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  /* Remember the original state of the blink/bright-background bit.
     It is stored at 0040:0065h in the BIOS data area.  */
  if (blink_bit == -1)
    blink_bit = (_farpeekb (_dos_ds, 0x465) & 0x20) == 0x20;

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  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

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/* Disable bright background colors (and enable blinking) if we found
   the video system in that state at startup.  */
static void
maybe_enable_blinking (void)
{
  if (blink_bit == 1)
    {
      union REGS regs;

      regs.h.bl = 1;
      regs.x.ax = 0x1003;
      int86 (0x10, &regs, &regs);
    }
}

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/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
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void
dos_set_window_size (rows, cols)
     int *rows, *cols;
{
  char video_name[30];
  Lisp_Object video_mode;
  int video_mode_value;
  int have_vga = 0;
  union REGS regs;
  int current_rows = ScreenRows (), current_cols = ScreenCols ();

  if (*rows == current_rows && *cols == current_cols)
    return;

  /* Do we have a VGA?  */
  regs.x.ax = 0x1a00;
  int86 (0x10, &regs, &regs);
  if (regs.h.al == 0x1a && regs.h.bl > 5 && regs.h.bl < 13)
    have_vga = 1;

  mouse_off ();

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  /* If the user specified a special video mode for these dimensions,
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     use that mode.  */
  sprintf (video_name, "screen-dimensions-%dx%d", *rows, *cols);
  video_mode = XSYMBOL (Fintern_soft (build_string (video_name),
				      Qnil))-> value;

  if (INTEGERP (video_mode)
      && (video_mode_value = XINT (video_mode)) > 0)
    {
      regs.x.ax = video_mode_value;
      int86 (0x10, &regs, &regs);
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      if (have_mouse)
	{
	  /* Must hardware-reset the mouse, or else it won't update
	     its notion of screen dimensions for some non-standard
	     video modes.  This is *painfully* slow...  */
	  regs.x.ax = 0;
	  int86 (0x33, &regs, &regs);
	}
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    }

  /* Find one of the dimensions supported by standard EGA/VGA
     which gives us at least the required dimensions.  */

#if __DJGPP__ > 1

  else
    {
      static struct {
	int rows;
	int need_vga;
      }	std_dimension[] = {
	  {25, 0},
	  {28, 1},
	  {35, 0},
	  {40, 1},
	  {43, 0},
	  {50, 1}
      };
      int i = 0;

      while (i < sizeof (std_dimension) / sizeof (std_dimension[0]))
	{
	 if (std_dimension[i].need_vga <= have_vga
	     && std_dimension[i].rows >= *rows)
	   {
	     if (std_dimension[i].rows != current_rows
		 || *cols != current_cols)
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	       _set_screen_lines (std_dimension[i].rows);
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	     break;
	   }
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	 i++;
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	}
    }

#else /* not __DJGPP__ > 1 */

  else if (*rows <= 25)
    {
      if (current_rows != 25 || current_cols != 80)
	{
	  regs.x.ax = 3;
	  int86 (0x10, &regs, &regs);
	  regs.x.ax = 0x1101;
	  regs.h.bl = 0;
	  int86 (0x10, &regs, &regs);
	  regs.x.ax = 0x1200;
	  regs.h.bl = 32;
	  int86 (0x10, &regs, &regs);
	  regs.x.ax = 3;
	  int86 (0x10, &regs, &regs);
	}
    }
  else if (*rows <= 50)
    if (have_vga && (current_rows != 50 || current_cols != 80)
	|| *rows <= 43 && (current_rows != 43 || current_cols != 80))
      {
	regs.x.ax = 3;
	int86 (0x10, &regs, &regs);
	regs.x.ax = 0x1112;
	regs.h.bl = 0;
	int86 (0x10, &regs, &regs);
	regs.x.ax = 0x1200;
	regs.h.bl = 32;
	int86 (0x10, &regs, &regs);
	regs.x.ax = 0x0100;
	regs.x.cx = 7;
	int86 (0x10, &regs, &regs);
      }
#endif /* not __DJGPP__ > 1 */

  if (have_mouse)
    {
      mouse_init ();
      mouse_on ();
    }

  /* Tell the caller what dimensions have been REALLY set.  */
  *rows = ScreenRows ();
  *cols = ScreenCols ();
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  /* Enable bright background colors.  */
  bright_bg ();
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  /* FIXME: I'm not sure the above will run at all on DOS/V.  But let's
     be defensive anyway.  */
  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (0, *cols * *rows);
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}

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/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
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static void
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mouse_off_maybe ()
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{
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  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

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static void
IT_ring_bell (void)
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{
  if (visible_bell)
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    {
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      mouse_off ();
      ScreenVisualBell ();
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    }
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  else
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    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
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}

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/* Given a face id FACE, extract the face parameters to be used for
   display until the face changes.  The face parameters (actually, its
   color) are used to construct the video attribute byte for each
   glyph during the construction of the buffer that is then blitted to
   the video RAM.  */
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static void
IT_set_face (int face)
{
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  struct face *fp = FACE_FROM_ID (selected_frame, face);
  unsigned long fg, bg;
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  if (!fp)
    fp = FACE_FROM_ID (selected_frame, DEFAULT_FACE_ID);
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  screen_face = face;
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  fg = fp->foreground;
  bg = fp->background;

  /* Don't use invalid colors.  In particular, a color of -1 means use
     the colors of the default face, except that if highlight is on,
     invert the foreground and the background.  Note that we assume
     all 16 colors to be available for the background, since Emacs
     switches on this mode (and loses the blinking attribute) at
     startup.  */
  if (fg == (unsigned long)-1)
    fg = highlight ? FRAME_BACKGROUND_PIXEL (selected_frame)
		   : FRAME_FOREGROUND_PIXEL (selected_frame);
  if (bg == (unsigned long)-1)
    bg = highlight ? FRAME_FOREGROUND_PIXEL (selected_frame)
		   : FRAME_BACKGROUND_PIXEL (selected_frame);
  if (termscript)
    fprintf (termscript, "<FACE %d%s: %d/%d>",
	     face, highlight ? "H" : "", fp->foreground, fp->background);
  if (fg >= 0 && fg < 16)
    {
      ScreenAttrib &= 0xf0;
      ScreenAttrib |= fg;
    }
  if (bg >= 0 && bg < 16)
    {
      ScreenAttrib &= 0x0f;
      ScreenAttrib |= ((bg & 0x0f) << 4);
    }
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}

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Lisp_Object Vdos_unsupported_char_glyph;

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static void
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IT_write_glyphs (struct glyph *str, int str_len)
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{
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  unsigned char *screen_buf, *screen_bp, *screen_buf_end, *bp;
  int unsupported_face = FAST_GLYPH_FACE (Vdos_unsupported_char_glyph);
  unsigned unsupported_char= FAST_GLYPH_CHAR (Vdos_unsupported_char_glyph);
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  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
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  register int sl = str_len;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

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  struct coding_system *coding = (CODING_REQUIRE_ENCODING (&terminal_coding)
				  ? &terminal_coding
				  : &safe_terminal_coding);
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  /* Do we need to consider conversion of unibyte characters to
     multibyte?  */
  int convert_unibyte_characters
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    = (NILP (current_buffer->enable_multibyte_characters)
       && unibyte_display_via_language_environment);
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  if (str_len == 0) return;
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  screen_buf = screen_bp = alloca (str_len * 2);
  screen_buf_end = screen_buf + str_len * 2;
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  /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
     the tail.  */
  terminal_coding.mode &= ~CODING_MODE_LAST_BLOCK;
  while (sl)
    {
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      int cf, chlen, enclen;
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      unsigned char workbuf[4], *buf;
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      unsigned ch;
      register GLYPH g = GLYPH_FROM_CHAR_GLYPH (*str);
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      /* Find the actual glyph to display by traversing the entire
	 aliases chain for this glyph.  */
      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);

      /* Glyphs with GLYPH_MASK_PADDING bit set are actually there
	 only for the redisplay code to know how many columns does
         this character occupy on the screen.  Skip padding glyphs.  */
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      if (CHAR_GLYPH_PADDING_P (*str))
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	{
	  str++;
	  sl--;
	}
      else
	{
	  /* Convert the character code to multibyte, if they
	     requested display via language environment.  */
	  ch = FAST_GLYPH_CHAR (g);
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	  /* We only want to convert unibyte characters to multibyte
	     in unibyte buffers!  Otherwise, the 8-bit code might come
	     from the display table set up to display foreign characters.  */
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	  if (SINGLE_BYTE_CHAR_P (ch) && convert_unibyte_characters
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	      && (ch >= 0240
		  || (ch >= 0200 && !NILP (Vnonascii_translation_table))))
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	    ch = unibyte_char_to_multibyte (ch);

	  /* Invalid characters are displayed with a special glyph.  */
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	  if (! GLYPH_CHAR_VALID_P (ch))
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	    {
	      g = !NILP (Vdos_unsupported_char_glyph)
		? Vdos_unsupported_char_glyph
		: MAKE_GLYPH (selected_frame, '\177',
			      GLYPH_FACE (selected_frame, g));
	      ch = FAST_GLYPH_CHAR (g);
	    }
	  if (COMPOSITE_CHAR_P (ch))
	    {
	      /* If CH is a composite character, we can display
		 only the first component.  */
	      g = cmpchar_table[COMPOSITE_CHAR_ID (ch)]->glyph[0],
	      ch = GLYPH_CHAR (selected_frame, g);
	      cf = FAST_GLYPH_FACE (g);
	    }

	  /* If the face of this glyph is different from the current
	     screen face, update the screen attribute byte.  */
	  cf = FAST_GLYPH_FACE (g);
	  if (cf != screen_face)
	    IT_set_face (cf);	/* handles invalid faces gracefully */

	  if (GLYPH_SIMPLE_P (tbase, tlen, g))
	    /* We generate the multi-byte form of CH in BUF.  */
	    chlen = CHAR_STRING (ch, workbuf, buf);
	  else
	    {
	      /* We have a string in Vglyph_table.  */
	      chlen = GLYPH_LENGTH (tbase, g);
	      buf = GLYPH_STRING (tbase, g);
	    }

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	  /* If the character is not multibyte, don't bother converting it.  */
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	  if (chlen == 1)
	    {
	      *conversion_buffer = (unsigned char)ch;
	      chlen = 0;
	      enclen = 1;
	    }
	  else
	    {
	      encode_coding (coding, buf, conversion_buffer, chlen,
			     conversion_buffer_size);
	      chlen -= coding->consumed;
	      enclen = coding->produced;

	      /* Replace glyph codes that cannot be converted by
		 terminal_coding with Vdos_unsupported_char_glyph.  */
	      if (*conversion_buffer == '?')
		{
		  char *cbp = conversion_buffer;

		  while (cbp < conversion_buffer + enclen && *cbp == '?')
		    *cbp++ = unsupported_char;
		  if (unsupported_face != screen_face)
		    IT_set_face (unsupported_face);
		}
	    }

	  if (enclen + chlen > screen_buf_end - screen_bp)
	    {
	      /* The allocated buffer for screen writes is too small.
		 Flush it and loop again without incrementing STR, so
		 that the next loop will begin with the same glyph.  */
	      int nbytes = screen_bp - screen_buf;

	      mouse_off_maybe ();
	      dosmemput (screen_buf, nbytes, (int)ScreenPrimary + offset);
	      if (screen_virtual_segment)
		dosv_refresh_virtual_screen (offset, nbytes / 2);
	      new_pos_X += nbytes / 2;
	      offset += nbytes;

	      /* Prepare to reuse the same buffer again.  */
	      screen_bp = screen_buf;
	    }
	  else
	    {
	      /* There's enough place in the allocated buffer to add
		 the encoding of this glyph.  */

	      /* First, copy the encoded bytes.  */
	      for (bp = conversion_buffer; enclen--; bp++)
		{
		  *screen_bp++ = (unsigned char)*bp;
		  *screen_bp++ = ScreenAttrib;
		  if (termscript)
		    fputc (*bp, termscript);
		}

	      /* Now copy the bytes not consumed by the encoding.  */
	      if (chlen > 0)
		{
		  buf += coding->consumed;
		  while (chlen--)
		    {
		      if (termscript)
			fputc (*buf, termscript);
		      *screen_bp++ = (unsigned char)*buf++;
		      *screen_bp++ = ScreenAttrib;
		    }
		}

	      /* Update STR and its remaining length.  */
	      str++;
	      sl--;
	    }
	}
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    }

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  /* Dump whatever is left in the screen buffer.  */
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  mouse_off_maybe ();
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  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
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  if (screen_virtual_segment)
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    dosv_refresh_virtual_screen (offset, (screen_bp - screen_buf) / 2);
  new_pos_X += (screen_bp - screen_buf) / 2;

  /* We may have to output some codes to terminate the writing.  */
  if (CODING_REQUIRE_FLUSHING (coding))
    {
      coding->mode |= CODING_MODE_LAST_BLOCK;
      encode_coding (coding, "", conversion_buffer, 0, conversion_buffer_size);
      if (coding->produced > 0)
	{
	  for (screen_bp = screen_buf, bp = conversion_buffer;
	       coding->produced--; bp++)
	    {
	      *screen_bp++ = (unsigned char)*bp;
	      *screen_bp++ = ScreenAttrib;
	      if (termscript)
		fputc (*bp, termscript);
	    }
	  offset += screen_bp - screen_buf;
	  mouse_off_maybe ();
	  dosmemput (screen_buf, screen_bp - screen_buf,
		     (int)ScreenPrimary + offset);
	  if (screen_virtual_segment)
	    dosv_refresh_virtual_screen (offset, (screen_bp - screen_buf) / 2);
	  new_pos_X += (screen_bp - screen_buf) / 2;
	}
    }
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}
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static void
IT_clear_end_of_line (int first_unused)
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{
  char *spaces, *sp;
  int i, j;
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  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
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  extern int fatal_error_in_progress;

  if (fatal_error_in_progress)
    return;
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  IT_set_face (0);
  if (termscript)
    fprintf (termscript, "<CLR:EOL>");
  i = (j = screen_size_X - new_pos_X) * 2;
  spaces = sp = alloca (i);
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  while (--j >= 0)
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    {
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      *sp++ = ' ';
      *sp++ = ScreenAttrib;
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    }

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  mouse_off_maybe ();
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  dosmemput (spaces, i, (int)ScreenPrimary + offset);
  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (offset, i / 2);
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}

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static void
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IT_clear_screen (void)
{
  if (termscript)
    fprintf (termscript, "<CLR:SCR>");
  IT_set_face (0);
  mouse_off ();
  ScreenClear ();
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  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (0, screen_size);
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  new_pos_X = new_pos_Y = 0;
}

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static void
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IT_clear_to_end (void)
{
  if (termscript)
    fprintf (termscript, "<CLR:EOS>");

  while (new_pos_Y < screen_size_Y) {
    new_pos_X = 0;
    IT_clear_end_of_line (0);
    new_pos_Y++;
  }
}

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static void
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IT_cursor_to (int y, int x)
{
  if (termscript)
    fprintf (termscript, "\n<XY=%dx%d>", x, y);
  new_pos_X = x;
  new_pos_Y = y;
}

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static int cursor_cleared;

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static void
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IT_display_cursor (int on)
{
  if (on && cursor_cleared)
    {
      ScreenSetCursor (current_pos_Y, current_pos_X);
      cursor_cleared = 0;
    }
  else if (!on && !cursor_cleared)
    {
      ScreenSetCursor (-1, -1);
      cursor_cleared = 1;
    }
}

/* Emacs calls cursor-movement functions a lot when it updates the
   display (probably a legacy of old terminals where you cannot
   update a screen line without first moving the cursor there).
   However, cursor movement is expensive on MSDOS (it calls a slow
   BIOS function and requires 2 mode switches), while actual screen
   updates access the video memory directly and don't depend on
   cursor position.  To avoid slowing down the redisplay, we cheat:
   all functions that move the cursor only set internal variables
   which record the cursor position, whereas the cursor is only
   moved to its final position whenever screen update is complete.

   `IT_cmgoto' is called from the keyboard reading loop and when the
   frame update is complete.  This means that we are ready for user
   input, so we update the cursor position to show where the point is,
   and also make the mouse pointer visible.

   Special treatment is required when the cursor is in the echo area,
   to put the cursor at the end of the text displayed there.  */

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static void
IT_cmgoto (FRAME_PTR f)
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{
  /* Only set the cursor to where it should be if the display is
     already in sync with the window contents.  */
  int update_cursor_pos = MODIFF == unchanged_modified;
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  static int previous_pos_X = -1;

  /* If the display is in sync, forget any previous knowledge about
     cursor position.  This is primarily for unexpected events like
     C-g in the minibuffer.  */
  if (update_cursor_pos && previous_pos_X >= 0)
    previous_pos_X = -1;
  /* If we are in the echo area, put the cursor at the
     end of the echo area message.  */
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  if (!update_cursor_pos
      && XFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (f))->top) <= new_pos_Y)
    {
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      int tem_X = current_pos_X, dummy;

      if (echo_area_glyphs)
	{
	  tem_X = echo_area_glyphs_length;
	  /* Save current cursor position, to be restored after the
	     echo area message is erased.  Only remember one level
	     of previous cursor position.  */
	  if (previous_pos_X == -1)
	    ScreenGetCursor (&dummy, &previous_pos_X);
	}
      else if (previous_pos_X >= 0)
	{
	  /* We wind up here after the echo area message is erased.
	     Restore the cursor position we remembered above.  */
	  tem_X = previous_pos_X;
	  previous_pos_X = -1;
	}
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      if (current_pos_X != tem_X)
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	{
	  new_pos_X = tem_X;
	  update_cursor_pos = 1;
	}
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    }

  if (update_cursor_pos
      && (current_pos_X != new_pos_X || current_pos_Y != new_pos_Y))
    {
      ScreenSetCursor (current_pos_Y = new_pos_Y, current_pos_X = new_pos_X);
      if (termscript)
	fprintf (termscript, "\n<CURSOR:%dx%d>", current_pos_X, current_pos_Y);
    }

  /* Maybe cursor is invisible, so make it visible.  */
  IT_display_cursor (1);

  /* Mouse pointer should be always visible if we are waiting for
     keyboard input.  */
  if (!mouse_visible)
    mouse_on ();
}

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static void
IT_reassert_line_highlight (int new, int vpos)
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{
  highlight = new;
  IT_set_face (0); /* To possibly clear the highlighting.  */
}

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static void
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IT_change_line_highlight (int new_highlight, int y, int vpos, int first_unused_hpos)
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{
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  highlight = new_highlight;
  IT_set_face (0); /* To possibly clear the highlighting.  */
  IT_cursor_to (vpos, 0);
  IT_clear_end_of_line (first_unused_hpos);
}

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static void
IT_update_begin (struct frame *foo)
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{
  highlight = 0;
  IT_set_face (0); /* To possibly clear the highlighting.  */
  screen_face = -1;
}

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static void
IT_update_end (struct frame *foo)
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{
}
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/* Copy LEN glyphs displayed on a single line whose vertical position
   is YPOS, beginning at horizontal position XFROM to horizontal
   position XTO, by moving blocks in the video memory.  Used by
   functions that insert and delete glyphs.  */
static void
IT_copy_glyphs (int xfrom, int xto, size_t len, int ypos)
{
  /* The offsets of source and destination relative to the
     conventional memorty selector.  */
  int from = 2 * (xfrom + screen_size_X * ypos) + ScreenPrimary;
  int to = 2 * (xto + screen_size_X * ypos) + ScreenPrimary;

  if (from == to || len <= 0)
    return;

  _farsetsel (_dos_ds);

  /* The source and destination might overlap, so we need to move
     glyphs non-destructively.  */
  if (from > to)
    {
      for ( ; len; from += 2, to += 2, len--)
	_farnspokew (to, _farnspeekw (from));
    }
  else
    {
      from += (len - 1) * 2;
      to += (len - 1) * 2;
      for ( ; len; from -= 2, to -= 2, len--)
	_farnspokew (to, _farnspeekw (from));
    }
  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (ypos * screen_size_X * 2, screen_size_X);
}

/* Insert and delete glyphs.  */
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static void
IT_insert_glyphs (start, len)
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     register struct glyph *start;
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     register int len;
{
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  int shift_by_width = screen_size_X - (new_pos_X + len);

  /* Shift right the glyphs from the nominal cursor position to the
     end of this line.  */
  IT_copy_glyphs (new_pos_X, new_pos_X + len, shift_by_width, new_pos_Y);

  /* Now write the glyphs to be inserted.  */
  IT_write_glyphs (start, len);
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}

static void
IT_delete_glyphs (n)
     register int n;
{
  abort ();
}

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/* set-window-configuration on window.c needs this.  */
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void
x_set_menu_bar_lines (f, value, oldval)
     struct frame *f;
     Lisp_Object value, oldval;
{
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  set_menu_bar_lines (f, value, oldval);
}
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/* This was copied from xfns.c  */
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Lisp_Object Qbackground_color;
Lisp_Object Qforeground_color;
extern Lisp_Object Qtitle;
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/* IT_set_terminal_modes is called when emacs is started,
   resumed, and whenever the screen is redrawn!  */
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static void
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IT_set_terminal_modes (void)
{
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  if (termscript)
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    fprintf (termscript, "\n<SET_TERM>");
  highlight = 0;

  screen_size_X =</