msdos.c 103 KB
Newer Older
1
/* MS-DOS specific C utilities.          -*- coding: raw-text -*-
2
   Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
3 4 5 6 7

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
Richard M. Stallman's avatar
Richard M. Stallman committed
8
the Free Software Foundation; either version 2, or (at your option)
Richard M. Stallman's avatar
Richard M. Stallman committed
9 10 11 12 13 14 15 16 17
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
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
20

21
/* Contributed by Morten Welinder */
Kim F. Storm's avatar
Kim F. Storm committed
22
/* New display, keyboard, and mouse control by Kim F. Storm */
23

Richard M. Stallman's avatar
Richard M. Stallman committed
24 25
/* Note: some of the stuff here was taken from end of sysdep.c in demacs. */

Richard M. Stallman's avatar
Richard M. Stallman committed
26
#include <config.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
27 28 29 30 31

#ifdef MSDOS
#include "lisp.h"
#include <stdio.h>
#include <stdlib.h>
32
#include <time.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
33 34 35
#include <sys/param.h>
#include <sys/time.h>
#include <dos.h>
36
#include <errno.h>
37
#include <string.h>	 /* for bzero and string functions */
38
#include <sys/stat.h>    /* for _fixpath */
39
#include <unistd.h>	 /* for chdir, dup, dup2, etc. */
40 41
#if __DJGPP__ >= 2
#include <fcntl.h>
42
#include <io.h>		 /* for setmode */
43 44
#include <dpmi.h>	 /* for __dpmi_xxx stuff */
#include <sys/farptr.h>	 /* for _farsetsel, _farnspokeb */
45
#include <libc/dosio.h>  /* for _USE_LFN */
46
#include <conio.h>	 /* for cputs */
47 48
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
49 50 51 52
#include "dosfns.h"
#include "msdos.h"
#include "systime.h"
#include "termhooks.h"
53
#include "termchar.h"
Morten Welinder's avatar
Morten Welinder committed
54 55
#include "dispextern.h"
#include "termopts.h"
56 57 58
#include "charset.h"
#include "coding.h"
#include "disptab.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
59
#include "frame.h"
Morten Welinder's avatar
Morten Welinder committed
60
#include "window.h"
61 62
#include "buffer.h"
#include "commands.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
63 64 65 66 67 68 69
#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

70 71 72 73
#ifndef _USE_LFN
#define _USE_LFN 0
#endif

74 75 76 77
#ifndef _dos_ds
#define _dos_ds _go32_info_block.selector_for_linear_memory
#endif

78 79
#if __DJGPP__ > 1

Richard M. Stallman's avatar
Richard M. Stallman committed
80
#include <signal.h>
81
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
82

83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
#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 */
102 103 104 105 106 107

static unsigned long
event_timestamp ()
{
  struct time t;
  unsigned long s;
Kim F. Storm's avatar
Kim F. Storm committed
108
  
109 110 111 112 113 114
  gettime (&t);
  s = t.ti_min;
  s *= 60;
  s += t.ti_sec;
  s *= 1000;
  s += t.ti_hund * 10;
Kim F. Storm's avatar
Kim F. Storm committed
115
  
116 117 118
  return s;
}

Kim F. Storm's avatar
Kim F. Storm committed
119 120 121 122 123 124

/* ------------------------ Mouse control ---------------------------
 *
 * Coordinates are in screen positions and zero based.
 * Mouse buttons are numbered from left to right and also zero based.
 */
Richard M. Stallman's avatar
Richard M. Stallman committed
125

Kim F. Storm's avatar
Kim F. Storm committed
126 127
int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;
Richard M. Stallman's avatar
Richard M. Stallman committed
128

Kim F. Storm's avatar
Kim F. Storm committed
129 130
static int mouse_last_x;
static int mouse_last_y;
Richard M. Stallman's avatar
Richard M. Stallman committed
131

Kim F. Storm's avatar
Kim F. Storm committed
132 133
static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;
Richard M. Stallman's avatar
Richard M. Stallman committed
134

Kim F. Storm's avatar
Kim F. Storm committed
135 136
void
mouse_on ()
Richard M. Stallman's avatar
Richard M. Stallman committed
137 138 139
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
140
  if (have_mouse > 0 && !mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
141
    {
Kim F. Storm's avatar
Kim F. Storm committed
142 143 144 145 146
      if (termscript)
	fprintf (termscript, "<M_ON>");
      regs.x.ax = 0x0001;
      int86 (0x33, &regs, &regs);
      mouse_visible = 1;
Richard M. Stallman's avatar
Richard M. Stallman committed
147 148 149
    }
}

Kim F. Storm's avatar
Kim F. Storm committed
150 151
void
mouse_off ()
Richard M. Stallman's avatar
Richard M. Stallman committed
152
{
Kim F. Storm's avatar
Kim F. Storm committed
153
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
154

Kim F. Storm's avatar
Kim F. Storm committed
155
  if (have_mouse > 0 && mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
156
    {
Kim F. Storm's avatar
Kim F. Storm committed
157 158 159 160 161
      if (termscript)
	fprintf (termscript, "<M_OFF>");
      regs.x.ax = 0x0002;
      int86 (0x33, &regs, &regs);
      mouse_visible = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
162 163 164
    }
}

165 166 167 168 169 170 171 172 173 174 175
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;
}

Kim F. Storm's avatar
Kim F. Storm committed
176 177 178
void
mouse_moveto (x, y)
     int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
179
{
Kim F. Storm's avatar
Kim F. Storm committed
180
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
181

Kim F. Storm's avatar
Kim F. Storm committed
182 183 184 185 186 187
  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);
Richard M. Stallman's avatar
Richard M. Stallman committed
188 189
}

Kim F. Storm's avatar
Kim F. Storm committed
190 191 192
static int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
193
{
Kim F. Storm's avatar
Kim F. Storm committed
194
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
195

Kim F. Storm's avatar
Kim F. Storm committed
196 197 198 199 200 201 202 203
  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);
Richard M. Stallman's avatar
Richard M. Stallman committed
204 205
}

Kim F. Storm's avatar
Kim F. Storm committed
206 207 208
static int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
209 210 211
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
212 213 214 215 216 217 218 219
  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);
Richard M. Stallman's avatar
Richard M. Stallman committed
220 221
}

222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240
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;
}

Kim F. Storm's avatar
Kim F. Storm committed
241 242 243 244 245 246 247 248 249
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;
250 251 252 253 254
  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;
Kim F. Storm's avatar
Kim F. Storm committed
255 256 257 258 259

  *f = selected_frame;
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
260 261
  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
Kim F. Storm's avatar
Kim F. Storm committed
262
}
Richard M. Stallman's avatar
Richard M. Stallman committed
263

Kim F. Storm's avatar
Kim F. Storm committed
264 265
static void
mouse_check_moved ()
Richard M. Stallman's avatar
Richard M. Stallman committed
266
{
267
  int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
268

Kim F. Storm's avatar
Kim F. Storm committed
269 270 271 272 273
  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;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
274

Kim F. Storm's avatar
Kim F. Storm committed
275 276 277 278
void
mouse_init ()
{
  union REGS regs;
279
  int b;
280

Kim F. Storm's avatar
Kim F. Storm committed
281 282
  if (termscript)
    fprintf (termscript, "<M_INIT>");
Richard M. Stallman's avatar
Richard M. Stallman committed
283

Kim F. Storm's avatar
Kim F. Storm committed
284 285
  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
286

287 288 289 290 291 292 293 294 295 296 297 298
  /* 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);
    }

Kim F. Storm's avatar
Kim F. Storm committed
299 300 301 302
  regs.x.ax = 0x0007;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenCols () - 1);
  int86 (0x33, &regs, &regs);
Richard M. Stallman's avatar
Richard M. Stallman committed
303

Kim F. Storm's avatar
Kim F. Storm committed
304 305 306 307
  regs.x.ax = 0x0008;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenRows () - 1);
  int86 (0x33, &regs, &regs);
Richard M. Stallman's avatar
Richard M. Stallman committed
308

Kim F. Storm's avatar
Kim F. Storm committed
309 310 311
  mouse_moveto (0, 0);
  mouse_visible = 0;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
312

Kim F. Storm's avatar
Kim F. Storm committed
313 314 315
/* ------------------------- Screen control ----------------------
 *
 */
316

Kim F. Storm's avatar
Kim F. Storm committed
317
static int internal_terminal = 0;
318

Kim F. Storm's avatar
Kim F. Storm committed
319 320 321 322
#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;
323

Kim F. Storm's avatar
Kim F. Storm committed
324 325 326
static int screen_size_X;
static int screen_size_Y;
static int screen_size;
Richard M. Stallman's avatar
Richard M. Stallman committed
327

Kim F. Storm's avatar
Kim F. Storm committed
328 329 330 331
static int current_pos_X;
static int current_pos_Y;
static int new_pos_X;
static int new_pos_Y;
Richard M. Stallman's avatar
Richard M. Stallman committed
332

Kim F. Storm's avatar
Kim F. Storm committed
333 334 335 336 337
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;
338
static unsigned char startup_screen_attrib;
Richard M. Stallman's avatar
Richard M. Stallman committed
339

340 341
static clock_t startup_time;

Kim F. Storm's avatar
Kim F. Storm committed
342
static int term_setup_done;
Richard M. Stallman's avatar
Richard M. Stallman committed
343

Kim F. Storm's avatar
Kim F. Storm committed
344
/* Similar to the_only_frame.  */
345
struct x_output the_only_x_display;
Richard M. Stallman's avatar
Richard M. Stallman committed
346

Kim F. Storm's avatar
Kim F. Storm committed
347 348
/* This is never dereferenced.  */
Display *x_current_display;
Richard M. Stallman's avatar
Richard M. Stallman committed
349

350 351 352 353 354 355 356 357
/* 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;
358 359
/* A flag to control how to display unibyte 8-bit characters.  */
extern int unibyte_display_via_language_environment;
360 361 362 363 364 365 366 367 368

#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;

369 370 371
  if (offset < 0 || count < 0)	/* paranoia; illegal values crash DOS/V */
    return;

372 373 374 375 376 377 378 379
  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

380
static void
Kim F. Storm's avatar
Kim F. Storm committed
381 382 383 384 385
dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
Richard M. Stallman's avatar
Richard M. Stallman committed
386
{
387 388
  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
389
  int l0 = len;
390 391

#if (__DJGPP__ < 2)
Kim F. Storm's avatar
Kim F. Storm committed
392 393 394 395
  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
396 397 398 399
#else
  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
400 401 402

  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
403
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
404
}
405
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
406 407 408

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

Kim F. Storm's avatar
Kim F. Storm committed
409
#if (__DJGPP__ < 2)
410
static void
411
do_visible_bell (xorattr)
Richard M. Stallman's avatar
Richard M. Stallman committed
412 413
     unsigned char xorattr;
{
414
  asm volatile
415
    ("  movb   $1,%%dl
Richard M. Stallman's avatar
Richard M. Stallman committed
416
visible_bell_0:
417
	movl   _ScreenPrimary,%%eax
418
	call   dosmemsetup
419 420 421 422
	movl   %%eax,%%ebx
	movl   %1,%%ecx
	movb   %0,%%al
	incl   %%ebx
Richard M. Stallman's avatar
Richard M. Stallman committed
423
visible_bell_1:
424 425 426
	xorb   %%al,%%gs:(%%ebx)
	addl   $2,%%ebx
	decl   %%ecx
427
	jne    visible_bell_1
428
	decb   %%dl
429
	jne    visible_bell_3
Richard M. Stallman's avatar
Richard M. Stallman committed
430
visible_bell_2:
431 432 433 434 435
	movzwl %%ax,%%eax
        movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	decw   %%cx
436 437
	jne    visible_bell_2
	jmp    visible_bell_0
438 439
visible_bell_3:"
     : /* no output */
Kim F. Storm's avatar
Kim F. Storm committed
440
     : "m" (xorattr), "g" (screen_size)
441
     : "%eax", "%ebx", /* "%gs",*/ "%ecx", "%edx");
Richard M. Stallman's avatar
Richard M. Stallman committed
442 443
}

Kim F. Storm's avatar
Kim F. Storm committed
444 445 446 447 448 449 450 451 452 453 454 455 456
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

457 458
static int blink_bit = -1;	/* the state of the blink bit at startup */

459 460 461 462 463 464
/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

465 466 467 468 469
  /* 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;

470 471 472 473 474
  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

475 476 477 478 479 480 481 482 483 484 485 486 487 488 489
/* 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);
    }
}

490 491
/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
492

493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514
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 ();

515
  /* If the user specified a special video mode for these dimensions,
516 517 518 519 520 521 522 523 524 525
     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);
526 527 528 529 530 531 532 533 534

      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);
	}
535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
    }

  /* 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)
564
	       _set_screen_lines (std_dimension[i].rows);
565 566
	     break;
	   }
567
	 i++;
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
	}
    }

#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 ();
616 617 618

  /* Enable bright background colors.  */
  bright_bg ();
619 620 621 622 623

  /* 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);
624 625
}

626 627
/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
628 629

static void
Kim F. Storm's avatar
Kim F. Storm committed
630
mouse_off_maybe ()
631
{
Kim F. Storm's avatar
Kim F. Storm committed
632 633 634 635 636 637 638 639 640 641 642 643
  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

644 645
static void
IT_ring_bell (void)
Kim F. Storm's avatar
Kim F. Storm committed
646 647
{
  if (visible_bell)
648
    {
Kim F. Storm's avatar
Kim F. Storm committed
649 650
      mouse_off ();
      ScreenVisualBell ();
651
    }
Kim F. Storm's avatar
Kim F. Storm committed
652
  else
653 654 655 656 657 658
    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
659 660
}

Kim F. Storm's avatar
Kim F. Storm committed
661 662 663 664 665 666 667 668 669 670 671 672 673
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)
674 675
    fprintf (termscript, "<FACE %d: %d/%d>",
	     face, FACE_FOREGROUND (fp), FACE_BACKGROUND (fp));
Kim F. Storm's avatar
Kim F. Storm committed
676 677 678 679
  screen_face = face;
  ScreenAttrib = (FACE_BACKGROUND (fp) << 4) | FACE_FOREGROUND (fp);
}

680 681
Lisp_Object Vdos_unsupported_char_glyph;

682
static void
683
IT_write_glyphs (GLYPH *str, int str_len)
Kim F. Storm's avatar
Kim F. Storm committed
684
{
685 686 687
  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);
688
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
689 690 691 692
  register int sl = str_len;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

693 694 695
  struct coding_system *coding = (CODING_REQUIRE_ENCODING (&terminal_coding)
				  ? &terminal_coding
				  : &safe_terminal_coding);
Morten Welinder's avatar
Morten Welinder committed
696

697 698 699
  /* Do we need to consider conversion of unibyte characters to
     multibyte?  */
  int convert_unibyte_characters
700 701
    = (NILP (current_buffer->enable_multibyte_characters)
       && unibyte_display_via_language_environment);
702

703
  if (str_len == 0) return;
704
  
705 706
  screen_buf = screen_bp = alloca (str_len * 2);
  screen_buf_end = screen_buf + str_len * 2;
707
  
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
  /* 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)
    {
      int cf, ch, chlen, enclen;
      unsigned char workbuf[4], *buf;
      register GLYPH g = *str;

      /* 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.  */
      if ((g & GLYPH_MASK_PADDING))
	{
	  str++;
	  sl--;
	}
      else
	{
	  /* Convert the character code to multibyte, if they
	     requested display via language environment.  */
	  ch = FAST_GLYPH_CHAR (g);
734 735 736
	  /* 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.  */
737
	  if (SINGLE_BYTE_CHAR_P (ch) && convert_unibyte_characters
738 739
	      && (ch >= 0240
		  || (ch >= 0200 && !NILP (Vnonascii_translation_table))))
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
	    ch = unibyte_char_to_multibyte (ch);

	  /* Invalid characters are displayed with a special glyph.  */
	  if (ch > MAX_CHAR)
	    {
	      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);
	    }

	  /* If the character is not multibyte, don't bother converting it.
	     FIXME: what about "emacs --unibyte"  */
	  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--;
	    }
	}
853 854
    }

855
  /* Dump whatever is left in the screen buffer.  */
Kim F. Storm's avatar
Kim F. Storm committed
856
  mouse_off_maybe ();
857
  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
858
  if (screen_virtual_segment)
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885
    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;
	}
    }
Kim F. Storm's avatar
Kim F. Storm committed
886
}
887

888 889
static void
IT_clear_end_of_line (int first_unused)
Kim F. Storm's avatar
Kim F. Storm committed
890 891 892
{
  char *spaces, *sp;
  int i, j;
893
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
894 895 896 897
  extern int fatal_error_in_progress;

  if (fatal_error_in_progress)
    return;
Kim F. Storm's avatar
Kim F. Storm committed
898 899 900 901 902 903

  IT_set_face (0);
  if (termscript)
    fprintf (termscript, "<CLR:EOL>");
  i = (j = screen_size_X - new_pos_X) * 2;
  spaces = sp = alloca (i);
904
  
Kim F. Storm's avatar
Kim F. Storm committed
905
  while (--j >= 0)
906
    {
Kim F. Storm's avatar
Kim F. Storm committed
907 908
      *sp++ = ' ';
      *sp++ = ScreenAttrib;
909 910
    }

Kim F. Storm's avatar
Kim F. Storm committed
911
  mouse_off_maybe ();
912 913 914
  dosmemput (spaces, i, (int)ScreenPrimary + offset);
  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (offset, i / 2);
915 916
}

917
static void
Kim F. Storm's avatar
Kim F. Storm committed
918 919 920 921 922 923 924
IT_clear_screen (void)
{
  if (termscript)
    fprintf (termscript, "<CLR:SCR>");
  IT_set_face (0);
  mouse_off ();
  ScreenClear ();
925 926
  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (0, screen_size);
Kim F. Storm's avatar
Kim F. Storm committed
927 928 929
  new_pos_X = new_pos_Y = 0;
}

930
static void
Kim F. Storm's avatar
Kim F. Storm committed
931 932 933 934 935 936 937 938 939 940 941 942
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++;
  }
}

943
static void
Kim F. Storm's avatar
Kim F. Storm committed
944 945 946 947 948 949 950 951
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;
}

952 953
static int cursor_cleared;

954
static void
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
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.  */

988 989
static void
IT_cmgoto (FRAME_PTR f)
990 991 992 993
{
  /* 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;
994 995 996 997 998 999 1000 1001 1002
  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.  */
1003 1004 1005
  if (!update_cursor_pos
      && XFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (f))->top) <= new_pos_Y)
    {
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
      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;
	}
1024

1025
      if (current_pos_X != tem_X)
1026 1027 1028 1029
	{
	  new_pos_X = tem_X;
	  update_cursor_pos = 1;
	}
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
    }

  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 ();
}

1049 1050
static void
IT_reassert_line_highlight (int new, int vpos)
Kim F. Storm's avatar
Kim F. Storm committed
1051 1052 1053 1054 1055
{
  highlight = new;
  IT_set_face (0); /* To possibly clear the highlighting.  */
}

1056 1057
static void
IT_change_line_highlight (int new_highlight, int vpos, int first_unused_hpos)
Richard M. Stallman's avatar
Richard M. Stallman committed
1058
{
Kim F. Storm's avatar
Kim F. Storm committed
1059 1060 1061 1062 1063 1064
  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);
}

1065 1066
static void
IT_update_begin (struct frame *foo)
Kim F. Storm's avatar
Kim F. Storm committed
1067 1068 1069 1070 1071 1072
{
  highlight = 0;
  IT_set_face (0); /* To possibly clear the highlighting.  */
  screen_face = -1;
}

1073 1074
static void
IT_update_end (struct frame *foo)
Kim F. Storm's avatar
Kim F. Storm committed
1075 1076
{
}
Richard M. Stallman's avatar
Richard M. Stallman committed
1077

1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
/* Insert and delete characters.  These are not supposed to be used
   because we are supposed to turn off the feature of using them by
   setting char_ins_del_ok to zero (see internal_terminal_init).  */
static void
IT_insert_glyphs (start, len)
     register char *start;
     register int len;
{
  abort ();
}

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

1096
/* set-window-configuration on window.c needs this.  */
1097 1098 1099 1100 1101
void
x_set_menu_bar_lines (f, value, oldval)
     struct frame *f;
     Lisp_Object value, oldval;
{
1102 1103
  set_menu_bar_lines (f, value, oldval);
}
1104

1105
/* This was copied from xfns.c  */
1106

1107 1108 1109
Lisp_Object Qbackground_color;
Lisp_Object Qforeground_color;
extern Lisp_Object Qtitle;
1110

1111 1112
/* IT_set_terminal_modes is called when emacs is started,
   resumed, and whenever the screen is redrawn!  */
Kim F. Storm's avatar
Kim F. Storm committed
1113

1114
static void
Kim F. Storm's avatar
Kim F. Storm committed
1115 1116
IT_set_terminal_modes (void)
{
1117
  if (termscript)
Kim F. Storm's avatar
Kim F. Storm committed
1118 1119 1120 1121 1122 1123
    fprintf (termscript, "\n<SET_TERM>");
  highlight = 0;

  screen_size_X = ScreenCols ();
  screen_size_Y = ScreenRows ();
  screen_size = screen_size_X * screen_size_Y;
1124
  
Kim F. Storm's avatar
Kim F. Storm committed
1125 1126 1127 1128 1129 1130
  new_pos_X = new_pos_Y = 0;
  current_pos_X = current_pos_Y = -1;

  if (term_setup_done)
    return;
  term_setup_done = 1;
1131
  
Kim F. Storm's avatar
Kim F. Storm committed
1132 1133
  startup_screen_size_X = screen_size_X;
  startup_screen_size_Y = screen_size_Y;
1134
  startup_screen_attrib = ScreenAttrib;
Kim F. Storm's avatar
Kim F. Storm committed
1135

1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
#if __DJGPP__ > 1
  /* Is DOS/V (or any other RSIS software which relocates
     the screen) installed?  */
  {
    unsigned short es_value;
    __dpmi_regs regs;

    regs.h.ah = 0xfe;	/* get relocated screen address */
    if (ScreenPrimary == 0xb0000UL || ScreenPrimary == 0xb8000UL)
      regs.x.es = (ScreenPrimary >> 4) & 0xffff;
    else if (screen_old_address) /* already switched to Japanese mode once */
      regs.x.es = (screen_old_address >> 4) & 0xffff;
    else
      regs.x.es = ScreenMode () == 7 ? 0xb000 : 0xb800;
    regs.x.di = 0;
    es_value = regs.x.es;
    __dpmi_int (0x10, &regs);

1154
    if (regs.x.es != es_value)
1155
      {
1156 1157 1158 1159 1160 1161
	/* screen_old_address is only set if ScreenPrimary does NOT
	   already point to the relocated buffer address returned by
	   the Int 10h/AX=FEh call above.  DJGPP v2.02 and later sets
	   ScreenPrimary to that address at startup under DOS/V.  */
	if (regs.x.es != (ScreenPrimary >> 4) & 0xffff)
	  screen_old_address = ScreenPrimary;
1162 1163 1164 1165 1166 1167 1168
	screen_virtual_segment = regs.x.es;
	screen_virtual_offset  = regs.x.di;
	ScreenPrimary = (screen_virtual_segment << 4) + screen_virtual_offset;
      }
  }
#endif /* __DJGPP__ > 1 */

Kim F. Storm's avatar
Kim F. Storm committed
1169 1170 1171 1172
  ScreenGetCursor (&startup_pos_Y, &startup_pos_X);
  ScreenRetrieve (startup_screen_buffer = xmalloc (screen_size * 2));

  if (termscript)
1173
    fprintf (termscript, "<SCREEN SAVED (dimensions=%dx%d)>\n",
1174
	     screen_size_X, screen_size_Y);
1175 1176

  bright_bg ();
Kim F. Storm's avatar
Kim F. Storm committed
1177 1178
}

1179 1180
/* IT_reset_terminal_modes is called when emacs is
   suspended or killed.  */
Kim F. Storm's avatar
Kim F. Storm committed
1181

1182
static void
Kim F. Storm's avatar
Kim F. Storm committed
1183 1184
IT_reset_terminal_modes (void)
{
1185 1186 1187 1188 1189 1190 1191 1192 1193
  int display_row_start = (int) ScreenPrimary;
  int saved_row_len     = startup_screen_size_X * 2;
  int update_row_len    = ScreenCols () * 2;
  int current_rows      = ScreenRows ();
  int to_next_row       = update_row_len;
  unsigned char *saved_row = startup_screen_buffer;
  int cursor_pos_X = ScreenCols () - 1;
  int cursor_pos_Y = ScreenRows () - 1;

Kim F. Storm's avatar
Kim F. Storm committed
1194
  if (termscript)
Richard M. Stallman's avatar
Richard M. Stallman committed
1195
    fprintf (termscript, "\n<RESET_TERM>");
Kim F. Storm's avatar
Kim F. Storm committed
1196 1197 1198 1199 1200 1201

  highlight = 0;

  if (!term_setup_done)
    return;
  
1202
  mouse_off ();
1203 1204 1205 1206

  /* Leave the video system in the same state as we found it,
     as far as the blink/bright-background bit is concerned.  */
  maybe_enable_blinking ();
1207

1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
  /* We have a situation here.
     We cannot just do ScreenUpdate(startup_screen_buffer) because
     the luser could have changed screen dimensions inside Emacs
     and failed (or didn't want) to restore them before killing
     Emacs.  ScreenUpdate() uses the *current* screen dimensions and
     thus will happily use memory outside what was allocated for
     `startup_screen_buffer'.
     Thus we only restore as much as the current screen dimensions
     can hold, and clear the rest (if the saved screen is smaller than
     the current) with the color attribute saved at startup.  The cursor
     is also restored within the visible dimensions.  */

  ScreenAttrib = startup_screen_attrib;

1222 1223 1224 1225
  /* Don't restore the screen if we are exiting less than 2 seconds
     after startup: we might be crashing, and the screen might show
     some vital clues to what's wrong.  */
  if (clock () - startup_time >= 2*CLOCKS_PER_SEC)
1226
    {
1227
      ScreenClear ();
1228
      if (screen_virtual_segment)
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
	dosv_refresh_virtual_screen (0, screen_size);

      if (update_row_len > saved_row_len)
	update_row_len = saved_row_len;
      if (current_rows > startup_screen_size_Y)
	current_rows = startup_screen_size_Y;

      if (termscript)
	fprintf (termscript, "<SCREEN RESTORED (dimensions=%dx%d)>\n",
		 update_row_len / 2, current_rows);

      while (current_rows--)
	{
	  dosmemput (saved_row, update_row_len, display_row_start);
	  if (screen_virtual_segment)
	    dosv_refresh_virtual_screen (display_row_start - ScreenPrimary,
					 update_row_len / 2);
	  saved_row         += saved_row_len;
	  display_row_start += to_next_row;
	}
1249 1250 1251 1252 1253 1254 1255 1256
    }
  if (startup_pos_X < cursor_pos_X)
    cursor_pos_X = startup_pos_X;
  if (startup_pos_Y < cursor_pos_Y)
    cursor_pos_Y = startup_pos_Y;

  ScreenSetCursor (cursor_pos_Y, cursor_pos_X);
  xfree (startup_screen_buffer);
Kim F. Storm's avatar
Kim F. Storm committed
1257 1258 1259 1260

  term_setup_done = 0;
}

1261 1262