path: root/src/msdos.c

/* MS-DOS specific C utilities.
   Copyright (C) 1993, 1994 Free Software Foundation, Inc.

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
the Free Software Foundation; either version 2, or (at your option)
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.  */

/* Contributed by Morten Welinder */
/* New display, keyboard, and mouse control by Kim F. Storm */

/* Note: some of the stuff here was taken from end of sysdep.c in demacs. */

#include <config.h>

#ifdef MSDOS
#include "lisp.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/time.h>
#include <dos.h>
#include "dosfns.h"
#include "msdos.h"
#include "systime.h"
#include "termhooks.h"
#include "dispextern.h"
#include "termopts.h"
#include "frame.h"
#include "window.h"
#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


static unsigned long
event_timestamp ()
{
  struct time t;
  unsigned long s;
  
  gettime (&t);
  s = t.ti_min;
  s *= 60;
  s += t.ti_sec;
  s *= 1000;
  s += t.ti_hund * 10;
  
  return s;
}


/* ------------------------ Mouse control ---------------------------
 *
 * Coordinates are in screen positions and zero based.
 * Mouse buttons are numbered from left to right and also zero based.
 */

int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;

static int mouse_last_x;
static int mouse_last_y;

static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;

void
mouse_on ()
{
  union REGS regs;

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

void
mouse_off ()
{
  union REGS regs;

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

void
mouse_moveto (x, y)
     int x, y;
{
  union REGS regs;

  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);
}

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

  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);
}

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

  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);
}

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;
}

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;
  union REGS regs;

  regs.x.ax = 0x0003;
  int86 (0x33, &regs, &regs);
  *f = selected_frame;
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  selected_frame->mouse_moved = 0;
  *x = make_number (ix);
  *y = make_number (iy);
  *time = event_timestamp ();
}

static void
mouse_check_moved ()
{
  int x, y;

  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;
}

void
mouse_init ()
{
  union REGS regs;

  if (termscript)
    fprintf (termscript, "<M_INIT>");

  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);

  regs.x.ax = 0x0007;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenCols () - 1);
  int86 (0x33, &regs, &regs);

  regs.x.ax = 0x0008;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenRows () - 1);
  int86 (0x33, &regs, &regs);

  mouse_moveto (0, 0);
  mouse_visible = 0;
}

/* ------------------------- Screen control ----------------------
 *
 */

static int internal_terminal = 0;

#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;

static int screen_size_X;
static int screen_size_Y;
static int screen_size;

static int current_pos_X;
static int current_pos_Y;
static int new_pos_X;
static int new_pos_Y;

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;

static int term_setup_done;

/* Similar to the_only_frame.  */
struct x_output the_only_x_display;

/* This is never dereferenced.  */
Display *x_current_display;


#define SCREEN_SET_CURSOR() 						\
  if (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)

static
dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
{
  int t = (int) ScreenPrimary + 2 * (x + y * screen_size_X);
  
  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
}
#endif

/* Flash the screen as a substitute for BEEPs.  */

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

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

/*
 * If we write a character in the position where the mouse is,
 * the mouse cursor may need to be refreshed.
 */

static void
mouse_off_maybe ()
{
  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

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

static void
IT_set_face (int face)
{
  struct face *fp;
  extern struct face *intern_face (/* FRAME_PTR, struct face * */);

  if (face == 1 || (face == 0 && highlight))
    fp = FRAME_MODE_LINE_FACE (foo);
  else if (face <= 0 || face >= FRAME_N_COMPUTED_FACES (foo))
    fp = FRAME_DEFAULT_FACE (foo);
  else
    fp = intern_face (selected_frame, FRAME_COMPUTED_FACES (foo)[face]);
  if (termscript)
    fprintf (termscript, "<FACE:%d:%d>", FACE_FOREGROUND (fp), FACE_BACKGROUND (fp));
  screen_face = face;
  ScreenAttrib = (FACE_BACKGROUND (fp) << 4) | FACE_FOREGROUND (fp);
}

static
IT_write_glyphs (GLYPH *str, int len)
{
  int newface;
  int ch, l = len;
  unsigned char *buf, *bp;

  if (len == 0) return;
  
  buf = bp = alloca (len * 2);
  
  while (--l >= 0)
    {
      newface = FAST_GLYPH_FACE (*str);
      if (newface != screen_face)
	IT_set_face (newface);
      ch = FAST_GLYPH_CHAR (*str);
      *bp++ = (unsigned char)ch;
      *bp++ = ScreenAttrib;
      
      if (termscript)
	fputc (ch, termscript);
      str++;
    }

  mouse_off_maybe ();
  dosmemput (buf, 2 * len, 
	     (int)ScreenPrimary + 2 * (new_pos_X + screen_size_X * new_pos_Y));
  new_pos_X += len;
}

static
IT_clear_end_of_line (first_unused)
{
  char *spaces, *sp;
  int i, j;

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

  mouse_off_maybe ();
  dosmemput (spaces, i, 
	     (int)ScreenPrimary + 2 * (new_pos_X + screen_size_X * new_pos_Y));
}

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

static
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++;
  }
}

static
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;
}

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

static
IT_change_line_highlight (new_highlight, vpos, first_unused_hpos)
{
  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);
}

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

static
IT_update_end ()
{
}

/* This was more or less copied from xterm.c */
static void
IT_set_menu_bar_lines (window, n)
  Lisp_Object window;
  int n;
{
  struct window *w = XWINDOW (window);

  XSETFASTINT (w->top, XFASTINT (w->top) + n);
  XSETFASTINT (w->height, XFASTINT (w->height) - n);

  /* Handle just the top child in a vertical split.  */
  if (!NILP (w->vchild))
    IT_set_menu_bar_lines (w->vchild, n);

  /* Adjust all children in a horizontal split.  */
  for (window = w->hchild; !NILP (window); window = w->next)
    {
      w = XWINDOW (window);
      IT_set_menu_bar_lines (window, n);
    }
}

/*
 * IT_set_terminal_modes is called when emacs is started,
 * resumed, and whenever the screen is redrawn!
 */

static
IT_set_terminal_modes (void)
{
  char *colors;
  FRAME_PTR f;
  struct face *fp;

  if (termscript)
    fprintf (termscript, "\n<SET_TERM>");
  highlight = 0;

  screen_size_X = ScreenCols ();
  screen_size_Y = ScreenRows ();
  screen_size = screen_size_X * screen_size_Y;
  
  new_pos_X = new_pos_Y = 0;
  current_pos_X = current_pos_Y = -1;

  if (term_setup_done)
    return;
  term_setup_done = 1;
  
  startup_screen_size_X = screen_size_X;
  startup_screen_size_Y = screen_size_Y;

  ScreenGetCursor (&startup_pos_Y, &startup_pos_X);
  ScreenRetrieve (startup_screen_buffer = xmalloc (screen_size * 2));

  if (termscript)
    fprintf (termscript, "<SCREEN SAVED>\n");
}

/*
 * IT_reset_terminal_modes is called when emacs is
 * suspended or killed.
 */

static
IT_reset_terminal_modes (void)
{
  if (termscript)
    fprintf (termscript, "\n<RESET_TERM>");

  highlight = 0;

  if (!term_setup_done)
    return;
  
  ScreenUpdate (startup_screen_buffer);
  ScreenSetCursor (startup_pos_Y, startup_pos_X);
  xfree (startup_screen_buffer);

  if (termscript)
    fprintf (termscript, "<SCREEN RESTORED>\n");

  term_setup_done = 0;
}

static
IT_set_terminal_window (void)
{
}

void
IT_set_frame_parameters (frame, alist)
     FRAME_PTR frame;
     Lisp_Object alist;
{
  Lisp_Object tail;
  int redraw;
  extern unsigned long load_color ();
  FRAME_PTR f = (FRAME_PTR) &the_only_frame;

  redraw = 0;
  for (tail = alist; CONSP (tail); tail = Fcdr (tail))
    {
      Lisp_Object elt, prop, val;

      elt = Fcar (tail);
      prop = Fcar (elt);
      val = Fcdr (elt);
      CHECK_SYMBOL (prop, 1);

      if (EQ (prop, intern ("foreground-color")))
	{
	  unsigned long new_color = load_color (f, val);
	  if (new_color != ~0)
	    {
	      FRAME_FOREGROUND_PIXEL (f) = new_color;
	      redraw = 1;
	    }
	}
      else if (EQ (prop, intern ("background-color")))
	{
	  unsigned long new_color = load_color (f, val);
	  if (new_color != ~0)
	    {
	      FRAME_BACKGROUND_PIXEL (f) = new_color & ~8;
	      redraw = 1;
	    }
	}
      else if (EQ (prop, intern ("menu-bar-lines")))
	{
	  int new;
	  int old = FRAME_MENU_BAR_LINES (the_only_frame);

	  if (INTEGERP (val))
	    new = XINT (val);
	  else
	    new = 0;
	  FRAME_MENU_BAR_LINES (f) = new;
	  IT_set_menu_bar_lines (the_only_frame.root_window, new - old);
	}
    }

  if (redraw)
    {
      recompute_basic_faces (f);
      Fredraw_frame (Fselected_frame ());
    }
}

#endif /* !HAVE_X_WINDOWS */


/* Do we need the internal terminal? */
void
internal_terminal_init ()
{
  char *term = getenv ("TERM");
  char *colors;

#ifdef HAVE_X_WINDOWS
  if (!inhibit_window_system)
    return;
#endif

  internal_terminal
    = (!noninteractive) && term && !strcmp (term, "internal");

  if (getenv ("EMACSTEST"))
    termscript = fopen (getenv ("EMACSTEST"), "wt");
  
#ifndef HAVE_X_WINDOWS
  if (!internal_terminal || inhibit_window_system)
    {
      the_only_frame.output_method = output_termcap;
      return;
    }

  Vwindow_system = intern ("pc");
  Vwindow_system_version = make_number (1);
 
  bzero (&the_only_x_display, sizeof the_only_x_display);
  the_only_x_display.background_pixel = 7; /* White */
  the_only_x_display.foreground_pixel = 0; /* Black */
  colors = getenv ("EMACSCOLORS");
  if (colors && strlen (colors) >= 2)
    {
      the_only_x_display.foreground_pixel = colors[0] & 0x07;
      the_only_x_display.background_pixel = colors[1] & 0x07;
    }
  the_only_x_display.line_height = 1;
  the_only_frame.output_data.x = &the_only_x_display;
  the_only_frame.output_method = output_msdos_raw;
  the_only_x_display.font = (XFontStruct *)1;   /* must *not* be zero */

  init_frame_faces ((FRAME_PTR) &the_only_frame);

  ring_bell_hook = IT_ring_bell;
  write_glyphs_hook = IT_write_glyphs;
  cursor_to_hook = raw_cursor_to_hook = IT_cursor_to;
  clear_to_end_hook = IT_clear_to_end;
  clear_end_of_line_hook = IT_clear_end_of_line;
  clear_frame_hook = IT_clear_screen;
  change_line_highlight_hook = IT_change_line_highlight;
  update_begin_hook = IT_update_begin;
  update_end_hook = IT_update_end;
  reassert_line_highlight_hook = IT_reassert_line_highlight;

  /* These hooks are called by term.c without being checked.  */
  set_terminal_modes_hook = IT_set_terminal_modes;
  reset_terminal_modes_hook = IT_reset_terminal_modes;
  set_terminal_window_hook = IT_set_terminal_window;
#endif
}

dos_get_saved_screen (screen, rows, cols)
     char **screen;
     int *rows;
     int *cols;
{
#ifndef HAVE_X_WINDOWS
  *screen = startup_screen_buffer;
  *cols = startup_screen_size_X;
  *rows = startup_screen_size_Y;
  return 1;
#else
  return 0;
#endif  
}



/* ----------------------- Keyboard control ----------------------
 *
 * Keymaps reflect the following keyboard layout:
 *
 *    0  1  2  3  4  5  6  7  8  9  10 11 12  BS
 *    TAB 15 16 17 18 19 20 21 22 23 24 25 26 (41)
 *    CLOK 30 31 32 33 34 35 36 37 38 39 40 (41) RET
 *    SH () 45 46 47 48 49 50 51 52 53 54  SHIFT
 *                    SPACE
 */

static int extended_kbd; /* 101 (102) keyboard present.	*/

struct dos_keyboard_map
{
  char *unshifted;
  char *shifted;
  char *alt_gr;
};


static struct dos_keyboard_map us_keyboard = {
/* 0         1         2         3         4         5      */
/* 01234567890123456789012345678901234567890 12345678901234 */
  "`1234567890-=  qwertyuiop[]   asdfghjkl;'\\   zxcvbnm,./  ",
/* 0123456789012345678901234567890123456789 012345678901234 */
  "~!@#$%^&*()_+  QWERTYUIOP{}   ASDFGHJKL:\"|   ZXCVBNM<>?  ",
  0				/* no Alt-Gr key */
};

static struct dos_keyboard_map fr_keyboard = {
/* 0         1         2         3         4         5      */
/* 012 3456789012345678901234567890123456789012345678901234 */
  "�&�\",(-�_��)=  azertyuiop^$   qsdfghjklm�*   wxcvbnm;:!  ",
/* 0123456789012345678901234567890123456789012345678901234 */
  " 1234567890�+  AZERTYUIOP��   QSDFGHJKLM%�   WXCVBN?./�  ",
/* 01234567 89012345678901234567890123456789012345678901234 */
  "  ~#{[|`\\^@]}             �                              "
};

static struct dos_keyboard_map dk_keyboard = {
/* 0         1         2         3         4         5      */
/* 0123456789012345678901234567890123456789012345678901234 */
  "�1234567890+|  qwertyuiop�~   asdfghjkl��'   zxcvbnm,.-  ",
/* 01 23456789012345678901234567890123456789012345678901234 */
  "�!\"#$%&/()=?`  QWERTYUIOP�^   ASDFGHJKL��*   ZXCVBNM;:_  ",
/* 0123456789012345678901234567890123456789012345678901234 */
  "  @�$  {[]} |                                             "
};

static struct keyboard_layout_list
{
  int country_code;
  struct dos_keyboard_map *keyboard_map;
} keyboard_layout_list[] =
{
  1, &us_keyboard,
  33, &fr_keyboard,
  45, &dk_keyboard
};

static struct dos_keyboard_map *keyboard;
static int keyboard_map_all;

int
dos_set_keyboard (code, always)
     int code;
     int always;
{
  int i;

  /* Initialize to US settings, for countries that don't have their own.  */
  keyboard = keyboard_layout_list[0].keyboard_map;
  keyboard_map_all = always;
  dos_keyboard_layout = 1;
  
  for (i = 0; i < (sizeof (keyboard_layout_list)/sizeof (struct keyboard_layout_list)); i++)
    if (code == keyboard_layout_list[i].country_code)
      {
	keyboard = keyboard_layout_list[i].keyboard_map;
	keyboard_map_all = always;
	dos_keyboard_layout = code;
	return 1;
      }
  return 0;
}

#define Ignore	0x0000
#define Normal	0x0000	/* normal key - alt changes scan-code */
#define FctKey	0x1000	/* func key if c == 0, else c */
#define Special	0x2000	/* func key even if c != 0 */
#define ModFct	0x3000	/* special if mod-keys, else 'c' */
#define Map	0x4000	/* alt scan-code, map to unshift/shift key */
#define KeyPad	0x5000	/* map to insert/kp-0 depending on c == 0xe0 */
#define Grey	0x6000	/* Grey keypad key */

#define Alt	0x0100	/* alt scan-code */
#define Ctrl	0x0200	/* ctrl scan-code */
#define Shift	0x0400	/* shift scan-code */

static struct
{
  unsigned char char_code;	/* normal code	*/
  unsigned char meta_code;	/* M- code	*/
  unsigned char keypad_code;	/* keypad code	*/
  unsigned char editkey_code;	/* edit key	*/
} keypad_translate_map[] = {
  '0',  '0',  0xb0, /* kp-0 */		0x63, /* insert */
  '1',  '1',  0xb1, /* kp-1 */		0x57, /* end */
  '2',  '2',  0xb2, /* kp-2 */		0x54, /* down */
  '3',  '3',  0xb3, /* kp-3 */		0x56, /* next */
  '4',  '4',  0xb4, /* kp-4 */		0x51, /* left */
  '5',  '5',  0xb5, /* kp-5 */		0xb5, /* kp-5 */
  '6',  '6',  0xb6, /* kp-6 */		0x53, /* right */
  '7',  '7',  0xb7, /* kp-7 */		0x50, /* home */
  '8',  '8',  0xb8, /* kp-8 */		0x52, /* up */
  '9',  '9',  0xb9, /* kp-9 */		0x55, /* prior */
  '.',  '-',  0xae, /* kp-decimal */	0xff  /* delete */
};

static struct
{
  unsigned char char_code;	/* normal code	*/
  unsigned char keypad_code;	/* keypad code	*/
} grey_key_translate_map[] = {
  '/',  0xaf, /* kp-decimal */
  '*',  0xaa, /* kp-multiply */
  '-',  0xad, /* kp-subtract */
  '+',  0xab, /* kp-add */
  '\r', 0x8d  /* kp-enter */
};

static unsigned short
ibmpc_translate_map[] =
{
  /* --------------- 00 to 0f --------------- */
  Normal | 0xff,	/* Ctrl Break + Alt-NNN */
  Alt | ModFct | 0x1b,		/* Escape */
  Normal | 1,			/* '1' */
  Normal | 2,			/* '2' */
  Normal | 3,			/* '3' */
  Normal | 4,			/* '4' */
  Normal | 5,			/* '5' */
  Normal | 6,			/* '6' */
  Normal | 7,			/* '7' */
  Normal | 8,			/* '8' */
  Normal | 9,			/* '9' */
  Normal | 10,			/* '0' */
  Normal | 11,			/* '-' */
  Normal | 12,			/* '=' */
  Special | 0x08,		/* Backspace */
  ModFct | 0x74,		/* Tab/Backtab */

  /* --------------- 10 to 1f --------------- */
  Map | 15,			/* 'q' */
  Map | 16,			/* 'w' */
  Map | 17,			/* 'e' */
  Map | 18,			/* 'r' */
  Map | 19,			/* 't' */
  Map | 20,			/* 'y' */
  Map | 21,			/* 'u' */
  Map | 22,			/* 'i' */
  Map | 23,			/* 'o' */
  Map | 24,			/* 'p' */
  Map | 25,			/* '[' */
  Map | 26,			/* ']' */ 
  ModFct | 0x0d,		/* Return */
  Ignore,			/* Ctrl */
  Map | 30,			/* 'a' */
  Map | 31,			/* 's' */

  /* --------------- 20 to 2f --------------- */
  Map | 32,			/* 'd' */
  Map | 33,			/* 'f' */
  Map | 34,			/* 'g' */
  Map | 35,			/* 'h' */
  Map | 36,			/* 'j' */
  Map | 37,			/* 'k' */
  Map | 38,			/* 'l' */
  Map | 39,			/* ';' */
  Map | 40,			/* '\'' */
  Map |  0,			/* '`' */
  Ignore,			/* Left shift */
  Map | 41,			/* '\\' */
  Map | 45,			/* 'z' */
  Map | 46,			/* 'x' */
  Map | 47,			/* 'c' */
  Map | 48,			/* 'v' */

  /* --------------- 30 to 3f --------------- */
  Map | 49,			/* 'b' */
  Map | 50,			/* 'n' */
  Map | 51,			/* 'm' */
  Map | 52,			/* ',' */
  Map | 53,			/* '.' */
  Map | 54,			/* '/' */
  Ignore,			/* Right shift */
  Grey | 1,			/* Grey * */
  Ignore,			/* Alt */
  Normal |  ' ',		/* ' ' */
  Ignore,			/* Caps Lock */
  FctKey | 0xbe,		/* F1 */
  FctKey | 0xbf,		/* F2 */
  FctKey | 0xc0,		/* F3 */
  FctKey | 0xc1,		/* F4 */
  FctKey | 0xc2,		/* F5 */

  /* --------------- 40 to 4f --------------- */
  FctKey | 0xc3,		/* F6 */
  FctKey | 0xc4,		/* F7 */
  FctKey | 0xc5,		/* F8 */
  FctKey | 0xc6,		/* F9 */
  FctKey | 0xc7,		/* F10 */
  Ignore,			/* Num Lock */
  Ignore,			/* Scroll Lock */
  KeyPad | 7,			/* Home */
  KeyPad | 8,			/* Up */
  KeyPad | 9,			/* Page Up */
  Grey | 2,			/* Grey - */
  KeyPad | 4,			/* Left */
  KeyPad | 5,			/* Keypad 5 */
  KeyPad | 6,			/* Right */
  Grey | 3,			/* Grey + */
  KeyPad | 1,			/* End */

  /* --------------- 50 to 5f --------------- */
  KeyPad | 2,			/* Down */
  KeyPad | 3,			/* Page Down */
  KeyPad | 0,			/* Insert */
  KeyPad | 10,			/* Delete */
  Shift | FctKey | 0xbe,	/* (Shift) F1 */
  Shift | FctKey | 0xbf,	/* (Shift) F2 */
  Shift | FctKey | 0xc0,	/* (Shift) F3 */
  Shift | FctKey | 0xc1,	/* (Shift) F4 */
  Shift | FctKey | 0xc2,	/* (Shift) F5 */
  Shift | FctKey | 0xc3,	/* (Shift) F6 */
  Shift | FctKey | 0xc4,	/* (Shift) F7 */
  Shift | FctKey | 0xc5,	/* (Shift) F8 */
  Shift | FctKey | 0xc6,	/* (Shift) F9 */
  Shift | FctKey | 0xc7,	/* (Shift) F10 */
  Ctrl | FctKey | 0xbe,		/* (Ctrl) F1 */
  Ctrl | FctKey | 0xbf,		/* (Ctrl) F2 */

  /* --------------- 60 to 6f --------------- */
  Ctrl | FctKey | 0xc0,		/* (Ctrl) F3 */
  Ctrl | FctKey | 0xc1,		/* (Ctrl) F4 */
  Ctrl | FctKey | 0xc2,		/* (Ctrl) F5 */
  Ctrl | FctKey | 0xc3,		/* (Ctrl) F6 */
  Ctrl | FctKey | 0xc4,		/* (Ctrl) F7 */
  Ctrl | FctKey | 0xc5,		/* (Ctrl) F8 */
  Ctrl | FctKey | 0xc6,		/* (Ctrl) F9 */
  Ctrl | FctKey | 0xc7,		/* (Ctrl) F10 */
  Alt | FctKey | 0xbe,		/* (Alt) F1 */
  Alt | FctKey | 0xbf,		/* (Alt) F2 */
  Alt | FctKey | 0xc0,		/* (Alt) F3 */
  Alt | FctKey | 0xc1,		/* (Alt) F4 */
  Alt | FctKey | 0xc2,		/* (Alt) F5 */
  Alt | FctKey | 0xc3,		/* (Alt) F6 */
  Alt | FctKey | 0xc4,		/* (Alt) F7 */
  Alt | FctKey | 0xc5,		/* (Alt) F8 */

  /* --------------- 70 to 7f --------------- */
  Alt | FctKey | 0xc6,		/* (Alt) F9 */
  Alt | FctKey | 0xc7,		/* (Alt) F10 */
  Ctrl | FctKey | 0x6d,		/* (Ctrl) Sys Rq */
  Ctrl | KeyPad | 4,		/* (Ctrl) Left */
  Ctrl | KeyPad | 6,		/* (Ctrl) Right */
  Ctrl | KeyPad | 1,		/* (Ctrl) End */
  Ctrl | KeyPad | 3,		/* (Ctrl) Page Down */
  Ctrl | KeyPad | 7,		/* (Ctrl) Home */
  Alt | Map | 1,		/* '1' */
  Alt | Map | 2,		/* '2' */
  Alt | Map | 3,		/* '3' */
  Alt | Map | 4,		/* '4' */
  Alt | Map | 5,		/* '5' */
  Alt | Map | 6,		/* '6' */
  Alt | Map | 7,		/* '7' */
  Alt | Map | 8,		/* '8' */

  /* --------------- 80 to 8f --------------- */
  Alt | Map | 9,		/* '9' */
  Alt | Map | 10,		/* '0' */
  Alt | Map | 11,		/* '-' */
  Alt | Map | 12,		/* '=' */
  Ctrl | KeyPad | 9,		/* (Ctrl) Page Up */
  FctKey | 0xc8,		/* F11 */
  FctKey | 0xc9,		/* F12 */
  Shift | FctKey | 0xc8,	/* (Shift) F11 */
  Shift | FctKey | 0xc9,	/* (Shift) F12 */
  Ctrl | FctKey | 0xc8,		/* (Ctrl) F11 */
  Ctrl | FctKey | 0xc9,		/* (Ctrl) F12 */
  Alt | FctKey | 0xc8,		/* (Alt) F11 */
  Alt | FctKey | 0xc9,		/* (Alt) F12 */
  Ctrl | KeyPad | 8,		/* (Ctrl) Up */
  Ctrl | Grey | 2,		/* (Ctrl) Grey - */
  Ctrl | KeyPad | 5,		/* (Ctrl) Keypad 5 */

  /* --------------- 90 to 9f --------------- */
  Ctrl | Grey | 3,		/* (Ctrl) Grey + */
  Ctrl | KeyPad | 2,		/* (Ctrl) Down */
  Ctrl | KeyPad | 0,		/* (Ctrl) Insert */
  Ctrl | KeyPad | 10,		/* (Ctrl) Delete */
  Ctrl | FctKey | 0x09,		/* (Ctrl) Tab */
  Ctrl | Grey | 0,		/* (Ctrl) Grey / */
  Ctrl | Grey | 1,		/* (Ctrl) Grey * */
  Alt | FctKey | 0x50,		/* (Alt) Home */
  Alt | FctKey | 0x52,		/* (Alt) Up */
  Alt | FctKey | 0x55,		/* (Alt) Page Up */
  Ignore,			/* NO KEY */
  Alt | FctKey | 0x51,		/* (Alt) Left */
  Ignore,			/* NO KEY */
  Alt | FctKey | 0x53,		/* (Alt) Right */
  Ignore,			/* NO KEY */
  Alt | FctKey | 0x57,		/* (Alt) End */

  /* --------------- a0 to af --------------- */
  Alt | KeyPad | 2,		/* (Alt) Down */
  Alt | KeyPad | 3,		/* (Alt) Page Down */
  Alt | KeyPad | 0,		/* (Alt) Insert */
  Alt | KeyPad | 10,		/* (Alt) Delete */
  Alt | Grey | 0,		/* (Alt) Grey / */
  Alt | FctKey | 0x09,		/* (Alt) Tab */
  Alt | Grey | 4		/* (Alt) Keypad Enter */
};

/* These bit-positions corresponds to values returned by BIOS */
#define SHIFT_P		0x0003	/* two bits! */
#define CTRL_P		0x0004
#define ALT_P		0x0008
#define SCRLOCK_P	0x0010
#define NUMLOCK_P	0x0020
#define CAPSLOCK_P	0x0040
#define ALT_GR_P	0x0800
#define SUPER_P		0x4000	/* pseudo */
#define HYPER_P		0x8000	/* pseudo */

static int
dos_get_modifiers (keymask)
     int *keymask;
{
  union REGS regs;
  int mask;
  int modifiers = 0;
  
  /* Calculate modifier bits */
  regs.h.ah = extended_kbd ? 0x12 : 0x02;
  int86 (0x16, &regs, &regs);

  if (!extended_kbd)
    {
      mask = regs.h.al & (SHIFT_P | CTRL_P | ALT_P | 
			  SCRLOCK_P | NUMLOCK_P | CAPSLOCK_P);
    }
  else
    {
      mask = regs.h.al & (SHIFT_P |
			  SCRLOCK_P | NUMLOCK_P | CAPSLOCK_P);
  
      /* Do not break international keyboard support.   */
      /* When Keyb.Com is loaded, the right Alt key is  */
      /* used for accessing characters like { and } 	  */
      if (regs.h.ah & 2)		/* Left ALT pressed ? */
	mask |= ALT_P;

      if ((regs.h.ah & 8) != 0)		/* Right ALT pressed ? */
	{
	  mask |= ALT_GR_P;
	  if (dos_hyper_key == 1)
	    {
	      mask |= HYPER_P;
	      modifiers |= hyper_modifier;
	    }
	  else if (dos_super_key == 1)
	    {
	      mask |= SUPER_P;
	      modifiers |= super_modifier;
	    }
	}
      
      if (regs.h.ah & 1)		/* Left CTRL pressed
	mask |= CTRL_P;

      if (regs.h.ah & 4)	 	/* Right CTRL pressed ? */
	{
	  if (dos_hyper_key == 2)
	    {
	      mask |= HYPER_P;
	      modifiers |= hyper_modifier;
	    }
	  else if (dos_super_key == 2)
	    {
	      mask |= SUPER_P;
	      modifiers |= super_modifier;
	    }
	  else
	    mask |= CTRL_P;
	}
    }

  if (mask & SHIFT_P)
    modifiers |= shift_modifier;
  if (mask & CTRL_P)
    modifiers |= ctrl_modifier;
  if (mask & ALT_P)
    modifiers |= meta_modifier;

  if (keymask)
    *keymask = mask;
  return modifiers;
}

#define NUM_RECENT_DOSKEYS (100)
int recent_doskeys_index;	/* Index for storing next element into recent_doskeys */
int total_doskeys;		/* Total number of elements stored into recent_doskeys */
Lisp_Object recent_doskeys; /* A vector, holding the last 100 keystrokes */

DEFUN ("recent-doskeys", Frecent_doskeys, Srecent_doskeys, 0, 0, 0,
  "Return vector of last 100 keyboard input values seen in dos_rawgetc.\n\
Each input key receives two values in this vector: first the ASCII code,\n\
and then the scan code.")
     ()
{
  Lisp_Object *keys = XVECTOR (recent_doskeys)->contents;
  Lisp_Object val;

  if (total_doskeys < NUM_RECENT_DOSKEYS)
    return Fvector (total_doskeys, keys);
  else
    {
      val = Fvector (NUM_RECENT_DOSKEYS, keys);
      bcopy (keys + recent_doskeys_index,
	     XVECTOR (val)->contents,
	     (NUM_RECENT_DOSKEYS - recent_doskeys_index) * sizeof (Lisp_Object));
      bcopy (keys,
	     XVECTOR (val)->contents + NUM_RECENT_DOSKEYS - recent_doskeys_index,
	     recent_doskeys_index * sizeof (Lisp_Object));
      return val;
    }
}

/* Get a char from keyboard.  Function keys are put into the event queue.  */
static int
dos_rawgetc ()
{
  struct input_event event;
  union REGS regs;
  
#ifndef HAVE_X_WINDOWS
  SCREEN_SET_CURSOR ();
  if (!mouse_visible) mouse_on ();
#endif
    
  /* The following condition is equivalent to `kbhit ()', except that
     it uses the bios to do its job.  This pleases DESQview/X.  */
  while ((regs.h.ah = extended_kbd ? 0x11 : 0x01),
	 int86 (0x16, &regs, &regs),
	 (regs.x.flags & 0x40) == 0)
    {
      union REGS regs;
      register unsigned char c;
      int sc, code, mask, kp_mode;
      int modifiers;

      regs.h.ah = extended_kbd ? 0x10 : 0x00;
      int86 (0x16, &regs, &regs);
      c = regs.h.al;
      sc = regs.h.ah;

      total_doskeys += 2;
      XVECTOR (recent_doskeys)->contents[recent_doskeys_index++]
	= make_number (c);
      if (recent_doskeys_index == NUM_RECENT_DOSKEYS)
	recent_doskeys_index = 0;
      XVECTOR (recent_doskeys)->contents[recent_doskeys_index++]
	= make_number (sc);
      if (recent_doskeys_index == NUM_RECENT_DOSKEYS)
	recent_doskeys_index = 0;

      modifiers = dos_get_modifiers (&mask);
      
#ifndef HAVE_X_WINDOWS
      if (!NILP (Vdos_display_scancodes))
	{
	  char buf[10];
	  sprintf (buf, "%02x:%02x*%04x",
		   (unsigned) (sc&0xff), (unsigned) c, mask);
	  dos_direct_output (screen_size_Y - 2, screen_size_X - 12, buf, 10);
	}
#endif

      if (sc == 0xe0)
	{
	  switch (c)
	    {
	    case 10:		/* Ctrl Grey Enter */
	      code = Ctrl | Grey | 4;
	      break;
	    case 13:		/* Grey Enter */
	      code = Grey | 4;
	      break;
	    case '/':		/* Grey / */
	      code = Grey | 0;
	      break;
	    default:
	      continue;
	    };
	  c = 0;
	}
      else
	{
	  if (sc >= (sizeof (ibmpc_translate_map) / sizeof (short)))
	    continue;
	  if ((code = ibmpc_translate_map[sc]) == Ignore)
	    continue;
	}
      
      if (c == 0)
	{
	  if (code & Alt)
	    modifiers |= meta_modifier;
	  if (code & Ctrl)
	    modifiers |= ctrl_modifier;
	  if (code & Shift)
	    modifiers |= shift_modifier;
	}
      
      switch (code & 0xf000)
	{
	case ModFct:
	  if (c && !(mask & (SHIFT_P | ALT_P | CTRL_P | HYPER_P | SUPER_P)))
	    return c;
	  c = 0;		/* Special */
	  
	case FctKey:
	  if (c != 0)
	    return c;
	    
	case Special:
	  code |= 0xff00;
	  break;
	  
	case Normal:
	  if (sc == 0)
	    {
	      if (c == 0)	/* ctrl-break */
		continue;
	      return c;		/* ALT-nnn */
	    }
	  if (!keyboard_map_all)
	    {
	      if (c != ' ')
		return c;
	      code = c;
	      break;
	    }
	  
	case Map:
	  if (c && !(mask & ALT_P) && !((mask & SHIFT_P) && (mask & CTRL_P)))
	    if (!keyboard_map_all)
	      return c;

	  code &= 0xff;
	  if (mask & ALT_P && code <= 10 && code > 0 && dos_keypad_mode & 0x200)
	    mask |= SHIFT_P;	/* ALT-1 => M-! etc. */
	  
	  if (mask & SHIFT_P)
	    {
	      code = keyboard->shifted[code];
	      mask -= SHIFT_P;
	      modifiers &= ~shift_modifier;
	    }
	  else
	    if ((mask & ALT_GR_P) && keyboard->alt_gr && keyboard->alt_gr[code] != ' ')
	      code = keyboard->alt_gr[code];
	    else
	      code = keyboard->unshifted[code];
	  break;

	case KeyPad:
	  code &= 0xff;
	  if (c == 0xe0)	/* edit key */
	    kp_mode = 3;
	  else
	    if ((mask & (NUMLOCK_P|CTRL_P|SHIFT_P|ALT_P)) == NUMLOCK_P) /* numlock on */
	      kp_mode = dos_keypad_mode & 0x03;
	    else
	      kp_mode = (dos_keypad_mode >> 4) & 0x03;
	  
	  switch (kp_mode)
	    {
	    case 0:
	      if (code == 10 && dos_decimal_point)
		return dos_decimal_point;
	      return keypad_translate_map[code].char_code;

	    case 1:
	      code = 0xff00 | keypad_translate_map[code].keypad_code;
	      break;

	    case 2:
	      code = keypad_translate_map[code].meta_code;
	      modifiers = meta_modifier;
	      break;
	      
	    case 3:
	      code = 0xff00 | keypad_translate_map[code].editkey_code;
	      break;
	    }
	  break;
	  
	case Grey:
	  code &= 0xff;
	  kp_mode = ((mask & (NUMLOCK_P|CTRL_P|SHIFT_P|ALT_P)) == NUMLOCK_P) ? 0x04 : 0x40;
	  if (dos_keypad_mode & kp_mode)
	    code = 0xff00 | grey_key_translate_map[code].keypad_code;
	  else
	    code = grey_key_translate_map[code].char_code;
	  break;
	}
      
    make_event:
      if (code == 0)
	continue;
      
      if (code >= 0x100)
	event.kind = non_ascii_keystroke;
      else
	event.kind = ascii_keystroke;
      event.code = code;
      event.modifiers =	modifiers;
      XSETFRAME (event.frame_or_window, selected_frame);
      event.timestamp = event_timestamp ();
      kbd_buffer_store_event (&event);
    }

  if (have_mouse > 0)
    {
      int but, press, x, y, ok;

      /* Check for mouse movement *before* buttons.  */
      mouse_check_moved ();

      for (but = 0; but < NUM_MOUSE_BUTTONS; but++)
	for (press = 0; press < 2; press++)
	  {
	    if (press)
	      ok = mouse_pressed (but, &x, &y);
	    else
	      ok = mouse_released (but, &x, &y);
	    if (ok)
	      {
		event.kind = mouse_click;
		event.code = but;
		event.modifiers = dos_get_modifiers (0)
		  | (press ? down_modifier : up_modifier);
		event.x = x;
		event.y = y;
		XSETFRAME (event.frame_or_window, selected_frame);
		event.timestamp = event_timestamp ();
		kbd_buffer_store_event (&event);
	      }
	  }
    }

  return -1;
}

static int prev_get_char = -1;

/* Return 1 if a key is ready to be read without suspending execution.  */
dos_keysns ()
{
  if (prev_get_char != -1)
    return 1;
  else
    return ((prev_get_char = dos_rawgetc ()) != -1);
}

/* Read a key.  Return -1 if no key is ready.  */
dos_keyread ()
{
  if (prev_get_char != -1)
    {
      int c = prev_get_char;
      prev_get_char = -1;
      return c;
    }
  else
    return dos_rawgetc ();
}

#ifndef HAVE_X_WINDOWS
/* See xterm.c for more info.  */
void
pixel_to_glyph_coords (f, pix_x, pix_y, x, y, bounds, noclip)
     FRAME_PTR f;
     register int pix_x, pix_y;
     register int *x, *y;
     void /* XRectangle */ *bounds;
     int noclip;
{
  if (bounds) abort ();

  /* Ignore clipping.  */

  *x = pix_x;
  *y = pix_y;
}

void
glyph_to_pixel_coords (f, x, y, pix_x, pix_y)
     FRAME_PTR f;
     register int x, y;
     register int *pix_x, *pix_y;
{
  *pix_x = x;
  *pix_y = y;
}

/* Simulation of X's menus.  Nothing too fancy here -- just make it work
   for now.

   Actually, I don't know the meaning of all the parameters of the functions
   here -- I only know how they are called by xmenu.c.  I could of course
   grab the nearest Xlib manual (down the hall, second-to-last door on the
   left), but I don't think it's worth the effort.  */

static XMenu *
IT_menu_create ()
{
  XMenu *menu;

  menu = (XMenu *) xmalloc (sizeof (XMenu));
  menu->allocated = menu->count = menu->panecount = menu->width = 0;
  return menu;
}

/* Allocate some (more) memory for MENU ensuring that there is room for one
   for item.  */

static void
IT_menu_make_room (XMenu *menu)
{
  if (menu->allocated == 0)
    {
      int count = menu->allocated = 10;
      menu->text = (char **) xmalloc (count * sizeof (char *));
      menu->submenu = (XMenu **) xmalloc (count * sizeof (XMenu *));
      menu->panenumber = (int *) xmalloc (count * sizeof (int));
    }
  else if (menu->allocated == menu->count)
    {
      int count = menu->allocated = menu->allocated + 10;
      menu->text
	= (char **) xrealloc (menu->text, count * sizeof (char *));
      menu->submenu
	= (XMenu **) xrealloc (menu->submenu, count * sizeof (XMenu *));
      menu->panenumber
	= (int *) xrealloc (menu->panenumber, count * sizeof (int));
    }
}

/* Search the given menu structure for a given pane number.  */

static XMenu *
IT_menu_search_pane (XMenu *menu, int pane)
{
  int i;
  XMenu *try;

  for (i = 0; i < menu->count; i++)
    if (menu->submenu[i])
      {
	if (pane == menu->panenumber[i])
	  return menu->submenu[i];
	if ((try = IT_menu_search_pane (menu->submenu[i], pane)))
	  return try;
      }
  return (XMenu *) 0;
}

/* Determine how much screen space a given menu needs.  */

static void
IT_menu_calc_size (XMenu *menu, int *width, int *height)
{
  int i, h2, w2, maxsubwidth, maxheight;

  maxsubwidth = 0;
  maxheight = menu->count;
  for (i = 0; i < menu->count; i++)
    {
      if (menu->submenu[i])
	{
	  IT_menu_calc_size (menu->submenu[i], &w2, &h2);
	  if (w2 > maxsubwidth) maxsubwidth = w2;
	  if (i + h2 > maxheight) maxheight = i + h2;
	}
    }
  *width = menu->width + maxsubwidth;
  *height = maxheight;
}

/* Display MENU at (X,Y) using FACES. */

static void
IT_menu_display (XMenu *menu, int y, int x, int *faces)
{
  int i, j, face, width;
  GLYPH *text, *p;
  char *q;
  int mx, my;
  int enabled, mousehere;
  int row, col;

  width = menu->width;
  text = (GLYPH *) xmalloc ((width + 2) * sizeof (GLYPH));
  ScreenGetCursor (&row, &col);
  mouse_get_xy (&mx, &my);
  IT_update_begin ();
  for (i = 0; i < menu->count; i++)
    {
      IT_cursor_to (y + i, x);
      enabled
	= (!menu->submenu[i] && menu->panenumber[i]) || (menu->submenu[i]);
      mousehere = (y + i == my && x <= mx && mx < x + width + 2);
      face = faces[enabled + mousehere * 2];
      p = text;
      *p++ = FAST_MAKE_GLYPH (' ', face);
      for (j = 0, q = menu->text[i]; *q; j++)
	*p++ = FAST_MAKE_GLYPH (*q++, face);
      for (; j < width; j++)
	*p++ = FAST_MAKE_GLYPH (' ', face);
      *p++ = FAST_MAKE_GLYPH (menu->submenu[i] ? 16 : ' ', face);
      IT_write_glyphs (text, width + 2);
    }
  IT_update_end ();
  IT_cursor_to (row, col);
  xfree (text);
}

/* --------------------------- X Menu emulation ---------------------- */

/* Create a brand new menu structure.  */

XMenu *
XMenuCreate (Display *foo1, Window foo2, char *foo3)
{
  return IT_menu_create ();
}

/* Create a new pane and place it on the outer-most level.  It is not
   clear that it should be placed out there, but I don't know what else
   to do.  */

int
XMenuAddPane (Display *foo, XMenu *menu, char *txt, int enable)
{
  int len;

  if (!enable)
    abort ();

  IT_menu_make_room (menu);
  menu->submenu[menu->count] = IT_menu_create ();
  menu->text[menu->count] = txt;
  menu->panenumber[menu->count] = ++menu->panecount;
  menu->count++;
  if ((len = strlen (txt)) > menu->width)
    menu->width = len;
  return menu->panecount;
}

/* Create a new item in a menu pane.  */

int
XMenuAddSelection (Display *bar, XMenu *menu, int pane,
		   int foo, char *txt, int enable)
{
  int len;

  if (pane)
    if (!(menu = IT_menu_search_pane (menu, pane)))
      return XM_FAILURE;
  IT_menu_make_room (menu);
  menu->submenu[menu->count] = (XMenu *) 0;
  menu->text[menu->count] = txt;
  menu->panenumber[menu->count] = enable;
  menu->count++;
  if ((len = strlen (txt)) > menu->width)
    menu->width = len;
  return XM_SUCCESS;
}

/* Decide where the menu would be placed if requested at (X,Y).  */

void
XMenuLocate (Display *foo0, XMenu *menu, int foo1, int foo2, int x, int y,
	     int *ulx, int *uly, int *width, int *height)
{
  if (menu->count == 1 && menu->submenu[0])
      /* Special case: the menu consists of only one pane.  */
    IT_menu_calc_size (menu->submenu[0], width, height);
  else
    IT_menu_calc_size (menu, width, height);
  *ulx = x + 1;
  *uly = y;
  *width += 2;
}

struct IT_menu_state
{
  void *screen_behind;
  XMenu *menu;
  int pane;
  int x, y;
};


/* Display menu, wait for user's response, and return that response.  */

int
XMenuActivate (Display *foo, XMenu *menu, int *pane, int *selidx,
	       int x0, int y0, unsigned ButtonMask, char **txt)
{
  struct IT_menu_state *state;
  int statecount;
  int x, y, i, b;
  int screensize;
  int faces[4], selectface;
  int leave, result, onepane;

  /* Just in case we got here without a mouse present...  */
  if (have_mouse <= 0)
    return XM_IA_SELECT;

  state = alloca (menu->panecount * sizeof (struct IT_menu_state));
  screensize = screen_size * 2;
  faces[0]
    = compute_glyph_face (&the_only_frame,
			  face_name_id_number
			  (&the_only_frame,
			   intern ("msdos-menu-passive-face")),
			  0);
  faces[1]
    = compute_glyph_face (&the_only_frame,
			  face_name_id_number
			  (&the_only_frame,
			   intern ("msdos-menu-active-face")),
			  0);
  selectface
    = face_name_id_number (&the_only_frame, intern ("msdos-menu-select-face"));
  faces[2] = compute_glyph_face (&the_only_frame, selectface, faces[0]);
  faces[3] = compute_glyph_face (&the_only_frame, selectface, faces[1]);

  statecount = 1;
  state[0].menu = menu;
  mouse_off ();
  ScreenRetrieve (state[0].screen_behind = xmalloc (screensize));
  if ((onepane = menu->count == 1 && menu->submenu[0]))
    {
      menu->width = menu->submenu[0]->width;
      state[0].menu = menu->submenu[0];
    }
  else
    {
      state[0].menu = menu;
    }
  state[0].x = x0 - 1;
  state[0].y = y0;
  state[0].pane = onepane;

  mouse_last_x = -1;  /* A hack that forces display.  */
  leave = 0;
  while (!leave)
    {
      if (!mouse_visible) mouse_on ();
      mouse_check_moved ();
      if (selected_frame->mouse_moved)
	{
	  selected_frame->mouse_moved = 0;
	  result = XM_IA_SELECT;
	  mouse_get_xy (&x, &y);
	  for (i = 0; i < statecount; i++)
	    if (state[i].x <= x && x < state[i].x + state[i].menu->width + 2)
	      {
		int dy = y - state[i].y;
		if (0 <= dy && dy < state[i].menu->count)
		  {
		    if (!state[i].menu->submenu[dy])
		      if (state[i].menu->panenumber[dy])
			result = XM_SUCCESS;
		      else
			result = XM_IA_SELECT;
		    *pane = state[i].pane - 1;
		    *selidx = dy;
		    /* We hit some part of a menu, so drop extra menues that
		       have been opened.  That does not include an open and
		       active submenu.  */
		    if (i != statecount - 2
			|| state[i].menu->submenu[dy] != state[i+1].menu)
		      while (i != statecount - 1)
			{
			  statecount--;
			  mouse_off ();
			  ScreenUpdate (state[statecount].screen_behind);
			  xfree (state[statecount].screen_behind);
			}
		    if (i == statecount - 1 && state[i].menu->submenu[dy])
		      {
			IT_menu_display (state[i].menu,
					 state[i].y,
					 state[i].x,
					 faces);
			state[statecount].menu = state[i].menu->submenu[dy];
			state[statecount].pane = state[i].menu->panenumber[dy];
			mouse_off ();
			ScreenRetrieve (state[statecount].screen_behind
					= xmalloc (screensize));
			state[statecount].x
			  = state[i].x + state[i].menu->width + 2;
			state[statecount].y = y;
			statecount++;			  
		      }
		  }
	      }
	  IT_menu_display (state[statecount - 1].menu,
			   state[statecount - 1].y,
			   state[statecount - 1].x,
			   faces);
	}
      for (b = 0; b < mouse_button_count; b++)
	{
	  (void) mouse_pressed (b, &x, &y);
	  if (mouse_released (b, &x, &y))
	    leave = 1;
	}
    }

  mouse_off ();
  ScreenUpdate (state[0].screen_behind);
  while (statecount--)
    xfree (state[statecount].screen_behind);
  return result;
}

/* Dispose of a menu.  */

void
XMenuDestroy (Display *foo, XMenu *menu)
{
  int i;
  if (menu->allocated)
    {
      for (i = 0; i < menu->count; i++)
	if (menu->submenu[i])
	  XMenuDestroy (foo, menu->submenu[i]);
      xfree (menu->text);
      xfree (menu->submenu);
      xfree (menu->panenumber);
    }
  xfree (menu);
}

int
x_pixel_width (struct frame *f)
{
  return FRAME_WIDTH (f);
}

int
x_pixel_height (struct frame *f)
{
  return FRAME_HEIGHT (f);
}
#endif /* !HAVE_X_WINDOWS */


/* ----------------------- DOS / UNIX conversion --------------------- */

/* Destructively turn backslashes into slashes.  */

void
dostounix_filename (p)
     register char *p;
{
  while (*p)
    {
      if (*p == '\\')
	*p = '/';
      p++;
    }
}

/* Destructively turn slashes into backslashes.  */

void
unixtodos_filename (p)
     register char *p;
{
  while (*p)
    {
      if (*p == '/')
	*p = '\\';
      p++;
    }
}

/* Get the default directory for a given drive.  0=def, 1=A, 2=B, ...  */

int
getdefdir (drive, dst)
     int drive;
     char *dst;
{
  union REGS regs;

  *dst++ = '/';
  regs.h.dl = drive;
  regs.x.si = (int) dst;
  regs.h.ah = 0x47;
  intdos (&regs, &regs);
  return !regs.x.cflag;
}

/* Remove all CR's that are followed by a LF.  */

int
crlf_to_lf (n, buf)
     register int n;
     register unsigned char *buf;
{
  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;
  unsigned char c;

  if (n == 0)
    return n;
  while (buf < endp - 1)
    {
      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
    }
  if (buf < endp)
    *np++ = *buf++;
  return np - startp;
}

/* The Emacs root directory as determined by init_environment.  */

static char emacsroot[MAXPATHLEN];

char *
rootrelativepath (rel)
     char *rel;
{
  static char result[MAXPATHLEN + 10];

  strcpy (result, emacsroot);
  strcat (result, "/");
  strcat (result, rel);
  return result;
}

/* Define a lot of environment variables if not already defined.  Don't
   remove anything unless you know what you're doing -- lots of code will
   break if one or more of these are missing.  */

void
init_environment (argc, argv, skip_args)
     int argc;
     char **argv;
     int skip_args;
{
  char *s, *t, *root;
  int len;

  /* Find our root from argv[0].  Assuming argv[0] is, say,
     "c:/emacs/bin/emacs.exe" our root will be "c:/emacs".  */
  root = alloca (MAXPATHLEN + 20);
  _fixpath (argv[0], root);
  strlwr (root);
  len = strlen (root);
  while (len > 0 && root[len] != '/' && root[len] != ':')
    len--;
  root[len] = '\0';
  if (len > 4 && strcmp (root + len - 4, "/bin") == 0)
    root[len - 4] = '\0';
  else
    strcpy (root, "c:/emacs");  /* Only under debuggers, I think.  */
  len = strlen (root);
  strcpy (emacsroot, root);

  /* We default HOME to our root.  */
  setenv ("HOME", root, 0);

  /* We default EMACSPATH to root + "/bin".  */
  strcpy (root + len, "/bin");
  setenv ("EMACSPATH", root, 0);

  /* I don't expect anybody to ever use other terminals so the internal
     terminal is the default.  */
  setenv ("TERM", "internal", 0);

#ifdef HAVE_X_WINDOWS
  /* Emacs expects DISPLAY to be set.  */
  setenv ("DISPLAY", "unix:0.0", 0);
#endif

  /* SHELL is a bit tricky -- COMSPEC is the closest we come, but we must
     downcase it and mirror the backslashes.  */
  s = getenv ("COMSPEC");
  if (!s) s = "c:/command.com";
  t = alloca (strlen (s) + 1);
  strcpy (t, s);
  strlwr (t);
  dostounix_filename (t);
  setenv ("SHELL", t, 0);

  /* PATH is also downcased and backslashes mirrored.  */
  s = getenv ("PATH");
  if (!s) s = "";
  t = alloca (strlen (s) + 3);
  /* Current directory is always considered part of MsDos's path but it is
     not normally mentioned.  Now it is.  */
  strcat (strcpy (t, ".;"), s);
  strlwr (t);
  dostounix_filename (t); /* Not a single file name, but this should work.  */
  setenv ("PATH", t, 1);

  /* In some sense all dos users have root privileges, so...  */
  setenv ("USER", "root", 0);
  setenv ("NAME", getenv ("USER"), 0);

  /* Time zone determined from country code.  To make this possible, the
     country code may not span more than one time zone.  In other words,
     in the USA, you lose.  */
  if (!getenv ("TZ"))
    switch (dos_country_code)
      {
      case 31:			/* Belgium */
      case 32:			/* The Netherlands */
      case 33:			/* France */
      case 34:			/* Spain */
      case 36:			/* Hungary */
      case 38:			/* Yugoslavia (or what's left of it?) */
      case 39:			/* Italy */
      case 41:			/* Switzerland */
      case 42:			/* Tjekia */
      case 45:			/* Denmark */
      case 46:			/* Sweden */
      case 47:			/* Norway */
      case 48:			/* Poland */
      case 49:			/* Germany */
	/* Daylight saving from last Sunday in March to last Sunday in
	   September, both at 2AM.  */
	setenv ("TZ", "MET-01METDST-02,M3.5.0/02:00,M9.5.0/02:00", 0);
	break;
      case 44:			/* United Kingdom */
      case 351:			/* Portugal */
      case 354:			/* Iceland */
	setenv ("TZ", "GMT+00", 0);
	break;
      case 81:			/* Japan */
      case 82:			/* Korea */
	setenv ("TZ", "JST-09", 0);
	break;
      case 90:			/* Turkey */
      case 358:			/* Finland */
	setenv ("TZ", "EET-02", 0);
	break;
      case 972:			/* Israel */
	/* This is an approximation.  (For exact rules, use the
	   `zoneinfo/israel' file which comes with DJGPP, but you need
	   to install it in `/usr/share/zoneinfo/' directory first.)  */
	setenv ("TZ", "IST-02IDT-03,M4.1.6/00:00,M9.5.6/01:00", 0);
	break;
      }
  init_gettimeofday ();
}



static int break_stat;	 /* BREAK check mode status.	*/
static int stdin_stat;	 /* stdin IOCTL status.		*/

/* These must be global.  */
static _go32_dpmi_seginfo ctrl_break_vector;
static _go32_dpmi_registers ctrl_break_regs;
static int ctrlbreakinstalled = 0;

/* Interrupt level detection of Ctrl-Break.  Don't do anything fancy here!  */

void
ctrl_break_func (regs)
     _go32_dpmi_registers *regs;
{
  Vquit_flag = Qt;
}

void
install_ctrl_break_check ()
{
  if (!ctrlbreakinstalled)
    {
      /* Don't press Ctrl-Break if you don't have either DPMI or Emacs
	 was compiler with Djgpp 1.11 maintenance level 5 or later!  */
      ctrlbreakinstalled = 1;
      ctrl_break_vector.pm_offset = (int) ctrl_break_func;
      _go32_dpmi_allocate_real_mode_callback_iret (&ctrl_break_vector,
						   &ctrl_break_regs);
      _go32_dpmi_set_real_mode_interrupt_vector (0x1b, &ctrl_break_vector);
    }
}

/*
 * Turn off Dos' Ctrl-C checking and inhibit interpretation of
 * control chars by Dos.
 * Determine the keyboard type.
 */

int
dos_ttraw ()
{
  union REGS inregs, outregs;
  static int first_time = 1;
  
  break_stat = getcbrk ();
  setcbrk (0);
  install_ctrl_break_check ();

  if (first_time)
    {
      inregs.h.ah = 0xc0;
      int86 (0x15, &inregs, &outregs);
      extended_kbd = (!outregs.x.cflag) && (outregs.h.ah == 0);
  
      have_mouse = 0;

      if (internal_terminal
#ifdef HAVE_X_WINDOWS
	  && inhibit_window_system
#endif
	  )
	{
	  inregs.x.ax = 0x0021;
	  int86 (0x33, &inregs, &outregs);
	  have_mouse = (outregs.x.ax & 0xffff) == 0xffff;
	  if (!have_mouse)
	    {
	      /* Reportedly, the above doesn't work for some mouse drivers.  There
		 is an additional detection method that should work, but might be
		 a little slower.  Use that as an alternative.  */
	      inregs.x.ax = 0x0000;
	      int86 (0x33, &inregs, &outregs);
	      have_mouse = (outregs.x.ax & 0xffff) == 0xffff;
	    }

	  if (have_mouse)
	    {
	      have_mouse = 1;	/* enable mouse */
	      mouse_visible = 0;
	      
	      if (outregs.x.bx == 3)
		{
		  mouse_button_count = 3;
		  mouse_button_translate[0] = 0; /* Left */
		  mouse_button_translate[1] = 2; /* Middle */
		  mouse_button_translate[2] = 1; /* Right */
		}
	      else
		{
		  mouse_button_count = 2;
		  mouse_button_translate[0] = 0;
		  mouse_button_translate[1] = 1;
		}
	      mouse_position_hook = &mouse_get_pos;
	      mouse_init ();
	    }
	}
      
      first_time = 0;
    }

  inregs.x.ax = 0x4400;		/* Get IOCTL status. */
  inregs.x.bx = 0x00;		/* 0 = stdin. */
  intdos (&inregs, &outregs);
  stdin_stat = outregs.h.dl;

  inregs.x.dx = stdin_stat | 0x0020; /* raw mode */
  inregs.x.ax = 0x4401;		/* Set IOCTL status */
  intdos (&inregs, &outregs);
  return !outregs.x.cflag;
}

/*  Restore status of standard input and Ctrl-C checking.  */
int
dos_ttcooked ()
{
  union REGS inregs, outregs;

  setcbrk (break_stat);
  mouse_off ();

  inregs.x.ax = 0x4401;	/* Set IOCTL status.	*/
  inregs.x.bx = 0x00;	/* 0 = stdin.		*/
  inregs.x.dx = stdin_stat;
  intdos (&inregs, &outregs);
  return !outregs.x.cflag;
}


/* Run command as specified by ARGV in directory DIR.
   The command is run with input from TEMPIN and output to file TEMPOUT.  */
int
run_msdos_command (argv, dir, tempin, tempout)
     unsigned char **argv;
     Lisp_Object dir;
     int tempin, tempout;
{
  char *saveargv1, *saveargv2, **envv;
  char oldwd[MAXPATHLEN + 1]; /* Fixed size is safe on MSDOS.  */
  int msshell, result = -1;
  int in, out, inbak, outbak, errbak;
  int x, y;
  Lisp_Object cmd;

  /* Get current directory as MSDOS cwd is not per-process.  */
  getwd (oldwd);

  cmd = Ffile_name_nondirectory (build_string (argv[0]));
  msshell = !NILP (Fmember (cmd, Fsymbol_value (intern ("msdos-shells"))))
    && !strcmp ("-c", argv[1]);
  if (msshell)
    {
      saveargv1 = argv[1];
      saveargv2 = argv[2];
      argv[1] = "/c";
      if (argv[2])
	{
	  char *p = alloca (strlen (argv[2]) + 1);

	  strcpy (argv[2] = p, saveargv2);
	  while (*p && isspace (*p))
	    p++;
	  while (*p && !isspace (*p))
	    if (*p == '/')
	      *p++ = '\\';
	    else
	      p++;
	}
    }

  /* Build the environment array.  */
  {
    extern Lisp_Object Vprocess_environment;
    Lisp_Object tmp, lst;
    int i, len;

    lst = Vprocess_environment;
    len = XFASTINT (Flength (lst));

    envv = alloca ((len + 1) * sizeof (char *));
    for (i = 0; i < len; i++)
      {
	tmp = Fcar (lst);
	lst = Fcdr (lst);
	CHECK_STRING (tmp, 0);
	envv[i] = alloca (XSTRING (tmp)->size + 1);
	strcpy (envv[i], XSTRING (tmp)->data);
      }
    envv[len] = (char *) 0;
  }

  if (STRINGP (dir))
    chdir (XSTRING (dir)->data);
  inbak = dup (0);
  outbak = dup (1);
  errbak = dup (2);
  if (inbak < 0 || outbak < 0 || errbak < 0)
    goto done; /* Allocation might fail due to lack of descriptors.  */

  if (have_mouse > 0)
    mouse_get_xy (&x, &y);

  dos_ttcooked ();	/* do it here while 0 = stdin */
  
  dup2 (tempin, 0);
  dup2 (tempout, 1);
  dup2 (tempout, 2);

  result = spawnve (P_WAIT, argv[0], argv, envv);
  
  dup2 (inbak, 0);
  dup2 (outbak, 1);
  dup2 (errbak, 2);
  close (inbak);
  close (outbak);
  close (errbak);

  dos_ttraw ();
  if (have_mouse > 0)
    {
      mouse_init ();
      mouse_moveto (x, y);
    }
  
 done:
  chdir (oldwd);
  if (msshell)
    {
      argv[1] = saveargv1;
      argv[2] = saveargv2;
    }
  return result;
}

croak (badfunc)
     char *badfunc;
{
  fprintf (stderr, "%s not yet implemented\r\n", badfunc);
  reset_sys_modes ();
  exit (1);
}


/* ------------------------- Compatibility functions -------------------
 *	gethostname
 *	gettimeofday
 */

/*
 * Hostnames for a pc are not really funny,
 * but they are used in change log so we emulate the best we can.
 */

gethostname (p, size)
     char *p;
     int size;
{
  char *q = egetenv ("HOSTNAME");

  if (!q) q = "pc";
  strcpy (p, q);
  return 0;
}

/* When time zones are set from Ms-Dos too many C-libraries are playing
   tricks with time values.  We solve this by defining our own version
   of `gettimeofday' bypassing GO32.  Our version needs to be initialized
   once and after each call to `tzset' with TZ changed.  That is 
   accomplished by aliasing tzset to init_gettimeofday. */

static struct tm time_rec;

int
gettimeofday (struct timeval *tp, struct timezone *tzp)
{
  if (tp)
    {
      struct time t;
      struct tm tm;
      
      gettime (&t);
      if (t.ti_hour < time_rec.tm_hour) /* midnight wrap */
	{
	  struct date d;
	  getdate (&d);
	  time_rec.tm_year = d.da_year - 1900;
	  time_rec.tm_mon = d.da_mon - 1;
	  time_rec.tm_mday = d.da_day;
	}
      
      time_rec.tm_hour = t.ti_hour;
      time_rec.tm_min = t.ti_min;
      time_rec.tm_sec = t.ti_sec;

      tm = time_rec;
      tm.tm_gmtoff = dos_timezone_offset;
      
      tp->tv_sec = mktime (&tm);	/* may modify tm */
      tp->tv_usec = t.ti_hund * (1000000 / 100);
    }
  /* Ignore tzp; it's obsolescent.  */
  return 0;
}


/*
 * A list of unimplemented functions that we silently ignore.
 */

unsigned alarm (s) unsigned s; {}
fork () { return 0; }
int kill (x, y) int x, y; { return -1; }
nice (p) int p; {}
void volatile pause () {}
request_sigio () {}
setpgrp () {return 0; }
setpriority (x,y,z) int x,y,z; { return 0; }
sigsetmask (x) int x; { return 0; }
unrequest_sigio () {}

int run_dos_timer_hooks = 0;

#ifndef HAVE_SELECT
#include "sysselect.h"

static int last_ti_sec = -1;
static int dos_menubar_clock_displayed = 0;

static void
check_timer (t)
  struct time *t;
{
  gettime (t);
  
  if (t->ti_sec == last_ti_sec)
    return;
  last_ti_sec = t->ti_sec;

  if (!NILP (Vdos_menubar_clock))
    {
      char clock_str[16];
      int len;
      int min = t->ti_min;
      int hour = t->ti_hour;

      if (dos_timezone_offset)
	{
	  int tz = dos_timezone_offset;
	  min -= tz % 60;
	  if (min < 0)
	    min += 60, hour--;
	  else
	    if (min >= 60)
	      min -= 60, hour++;
	  
	  if ((hour -= (tz / 60)) < 0)
	    hour += 24;
	  else
	    hour %= 24;
	}
      
      if ((dos_country_info[0x11] & 0x01) == 0) /* 12 hour clock */
	{
	  hour %= 12;
	  if (hour == 0) hour = 12;
	}

      len = sprintf (clock_str, "%2d.%02d.%02d", hour, min, t->ti_sec);
      dos_direct_output (0, screen_size_X - len - 1, clock_str, len);
      dos_menubar_clock_displayed = 1;
    }
  else if (dos_menubar_clock_displayed)
    {
      /* Erase last displayed time.  */
      dos_direct_output (0, screen_size_X - 9, "        ", 8);
      dos_menubar_clock_displayed = 0;
    }
  
  if (!NILP (Vdos_timer_hooks))
    run_dos_timer_hooks++;
}

/* Only event queue is checked.  */
int
sys_select (nfds, rfds, wfds, efds, timeout)
     int nfds;
     SELECT_TYPE *rfds, *wfds, *efds;
     EMACS_TIME *timeout;
{
  int check_input;
  long timeoutval, clnow, cllast;
  struct time t;

  check_input = 0;
  if (rfds)
    {
      check_input = FD_ISSET (0, rfds);
      FD_ZERO (rfds);
    }
  if (wfds)
    FD_ZERO (wfds);
  if (efds)
    FD_ZERO (efds);

  if (nfds != 1)
    abort ();
  
  /* If we are looking only for the terminal, with no timeout,
     just read it and wait -- that's more efficient.  */
  if (!timeout)
    {
      while (! detect_input_pending ())
	check_timer (&t);
    }
  else
    {
      timeoutval = EMACS_SECS (*timeout) * 100 + EMACS_USECS (*timeout) / 10000;
      check_timer (&t);
      cllast = t.ti_sec * 100 + t.ti_hund;

      while (!check_input || !detect_input_pending ())
	{
	  check_timer (&t);
	  clnow = t.ti_sec * 100 + t.ti_hund;
	  if (clnow < cllast) /* time wrap */
	    timeoutval -= clnow + 6000 - cllast;
	  else
	    timeoutval -= clnow - cllast;
	  if (timeoutval <= 0)  /* Stop on timer being cleared */
	    return 0;
	  cllast = clnow;
	}
    }
  
  FD_SET (0, rfds);
  return 1;
}
#endif

/*
 * Define overlayed functions:
 *
 *	chdir -> sys_chdir
 *	tzset -> init_gettimeofday
 *	abort -> dos_abort
 */

#ifdef chdir
#undef chdir
extern int chdir ();

int
sys_chdir (path)
     const char* path;
{
  int len = strlen (path);
  char *tmp = (char *)path;

  if (*tmp && tmp[1] == ':')
    {
      if (getdisk () != tolower (tmp[0]) - 'a')
	setdisk (tolower (tmp[0]) - 'a');
      tmp += 2;	/* strip drive: KFS 1995-07-06 */
      len -= 2;
    }
  
  if (len > 1 && (tmp[len - 1] == '/'))
    {
      char *tmp1 = (char *) alloca (len + 1);
      strcpy (tmp1, tmp);
      tmp1[len - 1] = 0;
      tmp = tmp1;
    }
  return chdir (tmp);
}
#endif

#ifdef tzset
#undef tzset
extern void tzset (void);

void
init_gettimeofday ()
{
  time_t ltm, gtm;
  struct tm *lstm;

  tzset ();
  ltm = gtm = time (NULL);
  ltm = mktime (lstm = localtime (&ltm));
  gtm = mktime (gmtime (&gtm));
  time_rec.tm_hour = 99;	/* force gettimeofday to get date */
  time_rec.tm_isdst = lstm->tm_isdst;
  dos_timezone_offset = time_rec.tm_gmtoff = (int)(gtm - ltm) / 60;
}
#endif

#ifdef abort
#undef abort
void
dos_abort (file, line)
     char *file;
     int  line;
{
  char buffer1[200], buffer2[400];
  int i, j;
  
  sprintf (buffer1, "<EMACS FATAL ERROR IN %s LINE %d>", file, line);
  for (i = j = 0; buffer1[i]; i++) {
    buffer2[j++] = buffer1[i];
    buffer2[j++] = 0x70;
  }
  dosmemput (buffer2, j, (int)ScreenPrimary);
  ScreenSetCursor (2, 0);
  abort ();
}
#endif

syms_of_msdos ()
{
  recent_doskeys = Fmake_vector (make_number (NUM_RECENT_DOSKEYS), Qnil);
  staticpro (&recent_doskeys);

  defsubr (&Srecent_doskeys);
}

#endif /* MSDOS */