msdos.c 115 KB
Newer Older
1
/* MS-DOS specific C utilities.          -*- coding: cp850 -*-
2

3
Copyright (C) 1993-1997, 1999-2013 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
4 5 6

This file is part of GNU Emacs.

7
GNU Emacs is free software: you can redistribute it and/or modify
Richard M. Stallman's avatar
Richard M. Stallman committed
8
it under the terms of the GNU General Public License as published by
9 10
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Richard M. Stallman's avatar
Richard M. Stallman committed
11 12 13 14 15 16 17

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
18
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
19

20
/* Contributed by Morten Welinder */
Kim F. Storm's avatar
Kim F. Storm committed
21
/* New display, keyboard, and mouse control by Kim F. Storm */
22

23 24 25 26 27 28 29
/* Note: This file MUST use a unibyte encoding, to both display the
   keys on the non-US keyboard layout as their respective labels, and
   provide the correct byte values for the keyboard input to inject
   into Emacs.  See 'struct dos_keyboard_map' below.  As long as there
   are only European keyboard layouts here, we are OK with DOS
   codepage 850 encoding.  */

Richard M. Stallman's avatar
Richard M. Stallman committed
30 31
/* Note: some of the stuff here was taken from end of sysdep.c in demacs. */

Richard M. Stallman's avatar
Richard M. Stallman committed
32
#include <config.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
33 34

#ifdef MSDOS
35
#include <setjmp.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
36 37
#include "lisp.h"
#include <stdio.h>
38
#include <time.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
39 40
#include <sys/param.h>
#include <sys/time.h>
Paul Eggert's avatar
Paul Eggert committed
41
/* gettime and settime in dos.h clash with their namesakes from
42 43 44
   gnulib, so we move out of our way the prototypes in dos.h.  */
#define gettime dos_h_gettime_
#define settime dos_h_settime_
Richard M. Stallman's avatar
Richard M. Stallman committed
45
#include <dos.h>
46 47
#undef gettime
#undef settime
48 49
#include <errno.h>
#include <sys/stat.h>    /* for _fixpath */
50
#include <unistd.h>	 /* for chdir, dup, dup2, etc. */
51
#include <dir.h>	 /* for getdisk */
52
#pragma pack(0)		 /* dir.h does a pack(4), which isn't GCC's default */
53
#include <fcntl.h>
54
#include <io.h>		 /* for setmode */
55 56
#include <dpmi.h>	 /* for __dpmi_xxx stuff */
#include <sys/farptr.h>	 /* for _farsetsel, _farnspokeb */
57
#include <libc/dosio.h>  /* for _USE_LFN */
58
#include <conio.h>	 /* for cputs */
59

Richard M. Stallman's avatar
Richard M. Stallman committed
60 61
#include "msdos.h"
#include "systime.h"
62
#include "frame.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
63
#include "termhooks.h"
64
#include "termchar.h"
Morten Welinder's avatar
Morten Welinder committed
65
#include "dispextern.h"
66
#include "dosfns.h"
Morten Welinder's avatar
Morten Welinder committed
67
#include "termopts.h"
68
#include "character.h"
69 70
#include "coding.h"
#include "disptab.h"
Morten Welinder's avatar
Morten Welinder committed
71
#include "window.h"
72 73
#include "buffer.h"
#include "commands.h"
74
#include "blockinput.h"
Eli Zaretskii's avatar
Eli Zaretskii committed
75
#include "keyboard.h"
Kenichi Handa's avatar
Kenichi Handa committed
76
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
77 78 79 80
#include <go32.h>
#include <pc.h>
#include <ctype.h>
/* #include <process.h> */
81 82
/* Damn that local process.h!  Instead we can define P_WAIT and
   spawnve ourselves.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
83
#define P_WAIT 1
84
extern int spawnve (int, const char *, char *const [], char *const []);
Richard M. Stallman's avatar
Richard M. Stallman committed
85

86 87 88 89
#ifndef _USE_LFN
#define _USE_LFN 0
#endif

90 91 92 93
#ifndef _dos_ds
#define _dos_ds _go32_info_block.selector_for_linear_memory
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
94
#include <signal.h>
95
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
96

97 98 99
#include "careadlinkat.h"
#include "allocator.h"

100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
#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 */
118

119
/* Return the current timestamp in milliseconds since midnight.  */
120
static unsigned long
121
event_timestamp (void)
122
{
123
  struct timespec t;
124
  unsigned long s;
Eli Zaretskii's avatar
Eli Zaretskii committed
125

126
  gettime (&t);
127 128
  s = t.tv_sec;
  s %= 86400;
129
  s *= 1000;
130
  s += t.tv_nsec * 1000000;
Eli Zaretskii's avatar
Eli Zaretskii committed
131

132 133 134
  return s;
}

Kim F. Storm's avatar
Kim F. Storm committed
135 136 137 138 139 140

/* ------------------------ 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
141

Eli Zaretskii's avatar
Eli Zaretskii committed
142 143 144 145
/* This used to be in termhooks.h, but mainstream Emacs code no longer
   uses it, and it was removed...  */
#define NUM_MOUSE_BUTTONS (5)

Kim F. Storm's avatar
Kim F. Storm committed
146 147
int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;
Richard M. Stallman's avatar
Richard M. Stallman committed
148

Kim F. Storm's avatar
Kim F. Storm committed
149 150
static int mouse_last_x;
static int mouse_last_y;
Richard M. Stallman's avatar
Richard M. Stallman committed
151

Kim F. Storm's avatar
Kim F. Storm committed
152 153
static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;
Richard M. Stallman's avatar
Richard M. Stallman committed
154

Kim F. Storm's avatar
Kim F. Storm committed
155
void
156
mouse_on (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
157 158 159
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
160
  if (have_mouse > 0 && !mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
161
    {
162 163 164 165
      struct tty_display_info *tty = CURTTY ();

      if (tty->termscript)
	fprintf (tty->termscript, "<M_ON>");
Kim F. Storm's avatar
Kim F. Storm committed
166 167 168
      regs.x.ax = 0x0001;
      int86 (0x33, &regs, &regs);
      mouse_visible = 1;
Richard M. Stallman's avatar
Richard M. Stallman committed
169 170 171
    }
}

Kim F. Storm's avatar
Kim F. Storm committed
172
void
173
mouse_off (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
174
{
Kim F. Storm's avatar
Kim F. Storm committed
175
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
176

Kim F. Storm's avatar
Kim F. Storm committed
177
  if (have_mouse > 0 && mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
178
    {
179 180 181 182
      struct tty_display_info *tty = CURTTY ();

      if (tty->termscript)
	fprintf (tty->termscript, "<M_OFF>");
Kim F. Storm's avatar
Kim F. Storm committed
183 184 185
      regs.x.ax = 0x0002;
      int86 (0x33, &regs, &regs);
      mouse_visible = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
186 187 188
    }
}

189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
static void
mouse_setup_buttons (int n_buttons)
{
  if (n_buttons == 3)
    {
      mouse_button_count = 3;
      mouse_button_translate[0] = 0; /* Left */
      mouse_button_translate[1] = 2; /* Middle */
      mouse_button_translate[2] = 1; /* Right */
    }
  else	/* two, what else? */
    {
      mouse_button_count = 2;
      mouse_button_translate[0] = 0;
      mouse_button_translate[1] = 1;
    }
}

DEFUN ("msdos-set-mouse-buttons", Fmsdos_set_mouse_buttons, Smsdos_set_mouse_buttons,
       1, 1, "NSet number of mouse buttons to: ",
209 210 211 212
       doc: /* Set the number of mouse buttons to use by Emacs.
This is useful with mice that report the number of buttons inconsistently,
e.g., if the number of buttons is reported as 3, but Emacs only sees 2 of
them.  This happens with wheeled mice on Windows 9X, for example.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
213
  (Lisp_Object nbuttons)
214
{
215 216
  int n;

217
  CHECK_NUMBER (nbuttons);
218 219
  n = XINT (nbuttons);
  if (n < 2 || n > 3)
220 221 222
    xsignal2 (Qargs_out_of_range,
	      build_string ("only 2 or 3 mouse buttons are supported"),
	      nbuttons);
223
  mouse_setup_buttons (n);
224 225 226
  return Qnil;
}

227 228 229 230 231 232 233 234 235 236 237
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
238
void
239
mouse_moveto (int x, int y)
Richard M. Stallman's avatar
Richard M. Stallman committed
240
{
Kim F. Storm's avatar
Kim F. Storm committed
241
  union REGS regs;
242
  struct tty_display_info *tty = CURTTY ();
Richard M. Stallman's avatar
Richard M. Stallman committed
243

244 245
  if (tty->termscript)
    fprintf (tty->termscript, "<M_XY=%dx%d>", x, y);
Kim F. Storm's avatar
Kim F. Storm committed
246 247 248 249
  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
250 251
}

Kim F. Storm's avatar
Kim F. Storm committed
252
static int
253
mouse_pressed (int b, int *xp, int *yp)
Richard M. Stallman's avatar
Richard M. Stallman committed
254
{
Kim F. Storm's avatar
Kim F. Storm committed
255
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
256

Kim F. Storm's avatar
Kim F. Storm committed
257 258 259 260 261 262 263 264
  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
265 266
}

Kim F. Storm's avatar
Kim F. Storm committed
267
static int
268
mouse_released (int b, int *xp, int *yp)
Richard M. Stallman's avatar
Richard M. Stallman committed
269 270 271
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
272 273 274 275 276 277 278 279
  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
280 281
}

282
static int
283
mouse_button_depressed (int b, int *xp, int *yp)
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
{
  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
300
void
Dmitry Antipov's avatar
Dmitry Antipov committed
301
mouse_get_pos (struct frame **f, int insist, Lisp_Object *bar_window,
302
	       enum scroll_bar_part *part, Lisp_Object *x, Lisp_Object *y,
303
	       Time *time)
Kim F. Storm's avatar
Kim F. Storm committed
304 305
{
  int ix, iy;
306 307 308 309 310
  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
311

Juanma Barranquero's avatar
Juanma Barranquero committed
312
  *f = SELECTED_FRAME ();
Kim F. Storm's avatar
Kim F. Storm committed
313 314 315
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
316 317
  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
Kim F. Storm's avatar
Kim F. Storm committed
318
}
Richard M. Stallman's avatar
Richard M. Stallman committed
319

Kim F. Storm's avatar
Kim F. Storm committed
320
static void
321
mouse_check_moved (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
322
{
323
  int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
324

Kim F. Storm's avatar
Kim F. Storm committed
325
  mouse_get_xy (&x, &y);
Juanma Barranquero's avatar
Juanma Barranquero committed
326
  SELECTED_FRAME ()->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
Kim F. Storm's avatar
Kim F. Storm committed
327 328 329
  mouse_last_x = x;
  mouse_last_y = y;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
330

Eli Zaretskii's avatar
Eli Zaretskii committed
331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
/* Force the mouse driver to ``forget'' about any button clicks until
   now.  */
static void
mouse_clear_clicks (void)
{
  int b;

  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
347
void
348
mouse_init (void)
Kim F. Storm's avatar
Kim F. Storm committed
349 350
{
  union REGS regs;
351
  struct tty_display_info *tty = CURTTY ();
352

353 354
  if (tty->termscript)
    fprintf (tty->termscript, "<M_INIT>");
Richard M. Stallman's avatar
Richard M. Stallman committed
355

Kim F. Storm's avatar
Kim F. Storm committed
356 357
  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
358

359 360 361 362
  /* 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.  */
Eli Zaretskii's avatar
Eli Zaretskii committed
363
  mouse_clear_clicks ();
364

Kim F. Storm's avatar
Kim F. Storm committed
365 366 367 368
  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
369

Kim F. Storm's avatar
Kim F. Storm committed
370 371 372 373
  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
374

Kim F. Storm's avatar
Kim F. Storm committed
375 376 377
  mouse_moveto (0, 0);
  mouse_visible = 0;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
378

Kim F. Storm's avatar
Kim F. Storm committed
379 380 381
/* ------------------------- Screen control ----------------------
 *
 */
382

Kim F. Storm's avatar
Kim F. Storm committed
383
static int internal_terminal = 0;
384

Kim F. Storm's avatar
Kim F. Storm committed
385 386 387
#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
388

Kim F. Storm's avatar
Kim F. Storm committed
389 390 391
static int screen_size_X;
static int screen_size_Y;
static int screen_size;
Richard M. Stallman's avatar
Richard M. Stallman committed
392

Kim F. Storm's avatar
Kim F. Storm committed
393 394 395 396
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
397

Kim F. Storm's avatar
Kim F. Storm committed
398 399 400 401 402
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;
403
static unsigned char startup_screen_attrib;
Richard M. Stallman's avatar
Richard M. Stallman committed
404

405 406
static clock_t startup_time;

Kim F. Storm's avatar
Kim F. Storm committed
407
static int term_setup_done;
Richard M. Stallman's avatar
Richard M. Stallman committed
408

409 410
static unsigned short outside_cursor;

Kim F. Storm's avatar
Kim F. Storm committed
411
/* Similar to the_only_frame.  */
412
struct tty_display_info the_only_display_info;
Richard M. Stallman's avatar
Richard M. Stallman committed
413

414 415 416 417 418 419 420 421
/* 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;
Kenichi Handa's avatar
Kenichi Handa committed
422 423
extern Lisp_Object Qcursor_type;
extern Lisp_Object Qbar, Qhbar;
424

Juanma Barranquero's avatar
Juanma Barranquero committed
425
/* The screen colors of the current frame, which serve as the default
426 427 428
   colors for newly-created frames.  */
static int initial_screen_colors[2];

429 430 431 432 433 434 435
/* 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;

436
  if (offset < 0 || count < 0)	/* paranoia; invalid values crash DOS/V */
437 438
    return;

439 440 441 442 443 444 445
  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);
}

446
static void
447
dos_direct_output (int y, int x, char *buf, int len)
Richard M. Stallman's avatar
Richard M. Stallman committed
448
{
449 450
  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
451
  int l0 = len;
452 453 454 455

  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
456 457 458

  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
Kim F. Storm's avatar
Kim F. Storm committed
459 460 461 462 463
}
#endif

#ifndef HAVE_X_WINDOWS

464 465
static int blink_bit = -1;	/* the state of the blink bit at startup */

466 467 468 469 470 471
/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

472 473 474 475 476
  /* 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;

477 478 479 480 481
  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
/* 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);
    }
}

497 498 499 500 501 502 503 504 505 506 507 508 509
/* Return non-zero if the system has a VGA adapter.  */
static int
vga_installed (void)
{
  union REGS regs;

  regs.x.ax = 0x1a00;
  int86 (0x10, &regs, &regs);
  if (regs.h.al == 0x1a && regs.h.bl > 5 && regs.h.bl < 13)
    return 1;
  return 0;
}

510 511
/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
512

513
void
514
dos_set_window_size (int *rows, int *cols)
515 516 517
{
  char video_name[30];
  union REGS regs;
Eli Zaretskii's avatar
Eli Zaretskii committed
518 519
  Lisp_Object video_mode;
  int video_mode_value, have_vga = 0;
520 521 522 523 524 525
  int current_rows = ScreenRows (), current_cols = ScreenCols ();

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

  mouse_off ();
526
  have_vga = vga_installed ();
527

528
  /* If the user specified a special video mode for these dimensions,
529
     use that mode.  */
Paul Eggert's avatar
Paul Eggert committed
530 531
  video_mode
    = Fsymbol_value (Fintern_soft (make_formatted_string
532 533
				   (video_name, "screen-dimensions-%dx%d",
				    *rows, *cols), Qnil));
534 535 536 537 538 539

  if (INTEGERP (video_mode)
      && (video_mode_value = XINT (video_mode)) > 0)
    {
      regs.x.ax = video_mode_value;
      int86 (0x10, &regs, &regs);
540 541 542 543 544 545 546 547 548

      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);
	}
549 550 551 552 553 554 555
    }

  /* Find one of the dimensions supported by standard EGA/VGA
     which gives us at least the required dimensions.  */
  else
    {
      static struct {
Eli Zaretskii's avatar
Eli Zaretskii committed
556
	int rows, need_vga;
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
      }	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)
574
	       _set_screen_lines (std_dimension[i].rows);
575 576
	     break;
	   }
577
	 i++;
578 579 580 581 582 583 584 585 586 587 588 589 590
	}
    }


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

  /* Tell the caller what dimensions have been REALLY set.  */
  *rows = ScreenRows ();
  *cols = ScreenCols ();
591

592 593 594 595 596
  /* Update Emacs' notion of screen dimensions.  */
  screen_size_X = *cols;
  screen_size_Y = *rows;
  screen_size = *cols * *rows;

597 598 599
  /* If the dimensions changed, the mouse highlight info is invalid.  */
  if (current_rows != *rows || current_cols != *cols)
    {
Juanma Barranquero's avatar
Juanma Barranquero committed
600
      struct frame *f = SELECTED_FRAME ();
601 602
      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
      Lisp_Object window = hlinfo->mouse_face_window;
603

604
      if (! NILP (window) && XFRAME (XWINDOW (window)->frame) == f)
605
	reset_mouse_highlight (hlinfo);
606 607
    }

608 609
  /* Enable bright background colors.  */
  bright_bg ();
610 611 612 613 614

  /* 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);
615 616
}

617 618
/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
619 620

static void
621
mouse_off_maybe (void)
622
{
Kim F. Storm's avatar
Kim F. Storm committed
623
  int x, y;
Eli Zaretskii's avatar
Eli Zaretskii committed
624

Kim F. Storm's avatar
Kim F. Storm committed
625 626
  if (!mouse_visible)
    return;
Eli Zaretskii's avatar
Eli Zaretskii committed
627

Kim F. Storm's avatar
Kim F. Storm committed
628 629 630
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
Eli Zaretskii's avatar
Eli Zaretskii committed
631

Kim F. Storm's avatar
Kim F. Storm committed
632 633 634
  mouse_off ();
}

635 636 637 638 639 640 641 642 643 644 645 646 647
#define DEFAULT_CURSOR_START (-1)
#define DEFAULT_CURSOR_WIDTH (-1)
#define BOX_CURSOR_WIDTH     (-32)

/* Set cursor to begin at scan line START_LINE in the character cell
   and extend for WIDTH scan lines.  Scan lines are counted from top
   of the character cell, starting from zero.  */
static void
msdos_set_cursor_shape (struct frame *f, int start_line, int width)
{
  unsigned desired_cursor;
  __dpmi_regs regs;
  int max_line, top_line, bot_line;
648
  struct tty_display_info *tty = FRAME_TTY (f);
649 650 651 652

  /* Avoid the costly BIOS call if F isn't the currently selected
     frame.  Allow for NULL as unconditionally meaning the selected
     frame.  */
Juanma Barranquero's avatar
Juanma Barranquero committed
653
  if (f && f != SELECTED_FRAME ())
654 655
    return;

656 657
  if (tty->termscript)
    fprintf (tty->termscript, "\nCURSOR SHAPE=(%d,%d)", start_line, width);
658

659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
  /* The character cell size in scan lines is stored at 40:85 in the
     BIOS data area.  */
  max_line = _farpeekw (_dos_ds, 0x485) - 1;
  switch (max_line)
    {
      default:	/* this relies on CGA cursor emulation being ON! */
      case 7:
	bot_line = 7;
	break;
      case 9:
	bot_line = 9;
	break;
      case 13:
	bot_line = 12;
	break;
      case 15:
	bot_line = 14;
	break;
    }

  if (width < 0)
    {
      if (width == BOX_CURSOR_WIDTH)
	{
	  top_line = 0;
	  bot_line = max_line;
	}
      else if (start_line != DEFAULT_CURSOR_START)
	{
	  top_line = start_line;
	  bot_line = top_line - width - 1;
	}
      else if (width != DEFAULT_CURSOR_WIDTH)
	{
	  top_line = 0;
	  bot_line = -1 - width;
	}
      else
	top_line = bot_line + 1;
    }
  else if (width == 0)
    {
      /* [31, 0] seems to DTRT for all screen sizes.  */
      top_line = 31;
      bot_line = 0;
    }
  else	/* WIDTH is positive */
    {
      if (start_line != DEFAULT_CURSOR_START)
	bot_line = start_line;
      top_line = bot_line - (width - 1);
    }

  /* If the current cursor shape is already what they want, we are
     history here.  */
  desired_cursor = ((top_line & 0x1f) << 8) | (bot_line & 0x1f);
  if (desired_cursor == _farpeekw (_dos_ds, 0x460))
    return;

  regs.h.ah = 1;
  regs.x.cx = desired_cursor;
  __dpmi_int (0x10, &regs);
}

static void
IT_set_cursor_type (struct frame *f, Lisp_Object cursor_type)
{
Eli Zaretskii's avatar
Eli Zaretskii committed
726
  if (EQ (cursor_type, Qbar) || EQ (cursor_type, Qhbar))
727 728 729 730
    {
      /* Just BAR means the normal EGA/VGA cursor.  */
      msdos_set_cursor_shape (f, DEFAULT_CURSOR_START, DEFAULT_CURSOR_WIDTH);
    }
Eli Zaretskii's avatar
Eli Zaretskii committed
731 732 733
  else if (CONSP (cursor_type)
	   && (EQ (XCAR (cursor_type), Qbar)
	       || EQ (XCAR (cursor_type), Qhbar)))
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
    {
      Lisp_Object bar_parms = XCDR (cursor_type);
      int width;

      if (INTEGERP (bar_parms))
	{
	  /* Feature: negative WIDTH means cursor at the top
	     of the character cell, zero means invisible cursor.  */
	  width = XINT (bar_parms);
	  msdos_set_cursor_shape (f, width >= 0 ? DEFAULT_CURSOR_START : 0,
				  width);
	}
      else if (CONSP (bar_parms)
	       && INTEGERP (XCAR (bar_parms))
	       && INTEGERP (XCDR (bar_parms)))
	{
	  int start_line = XINT (XCDR (bar_parms));

	  width = XINT (XCAR (bar_parms));
	  msdos_set_cursor_shape (f, start_line, width);
	}
    }
  else
757 758 759 760 761 762
    {
      /* Treat anything unknown as "box cursor".  This includes nil, so
	 that a frame which doesn't specify a cursor type gets a box,
	 which is the default in Emacs.  */
      msdos_set_cursor_shape (f, 0, BOX_CURSOR_WIDTH);
    }
763 764
}

765
static void
766
IT_ring_bell (struct frame *f)
Kim F. Storm's avatar
Kim F. Storm committed
767 768
{
  if (visible_bell)
769
    {
Kim F. Storm's avatar
Kim F. Storm committed
770 771
      mouse_off ();
      ScreenVisualBell ();
772
    }
Kim F. Storm's avatar
Kim F. Storm committed
773
  else
774 775 776 777 778 779
    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
780 781
}

782 783 784 785 786
/* Given a face id FACE, extract the face parameters to be used for
   display until the face changes.  The face parameters (actually, its
   color) are used to construct the video attribute byte for each
   glyph during the construction of the buffer that is then blitted to
   the video RAM.  */
Kim F. Storm's avatar
Kim F. Storm committed
787 788 789
static void
IT_set_face (int face)
{
Juanma Barranquero's avatar
Juanma Barranquero committed
790
  struct frame *sf = SELECTED_FRAME ();
791 792 793
  struct face *fp  = FACE_FROM_ID (sf, face);
  struct face *dfp = FACE_FROM_ID (sf, DEFAULT_FACE_ID);
  unsigned long fg, bg, dflt_fg, dflt_bg;
794
  struct tty_display_info *tty = FRAME_TTY (sf);
Kim F. Storm's avatar
Kim F. Storm committed
795

796
  if (!fp)
797
    {
798
      fp = dfp;
799 800 801
      /* The default face for the frame should always be realized and
	 cached.  */
      if (!fp)
802
	emacs_abort ();
803
    }
Kim F. Storm's avatar
Kim F. Storm committed
804
  screen_face = face;
805 806
  fg = fp->foreground;
  bg = fp->background;
807 808
  dflt_fg = dfp->foreground;
  dflt_bg = dfp->background;
809

810 811 812 813
  /* Don't use invalid colors.  In particular, FACE_TTY_DEFAULT_* colors
     mean use the colors of the default face.  Note that we assume all
     16 colors to be available for the background, since Emacs switches
     on this mode (and loses the blinking attribute) at startup.  */
814
  if (fg == FACE_TTY_DEFAULT_COLOR || fg == FACE_TTY_DEFAULT_FG_COLOR)
815
    fg = FRAME_FOREGROUND_PIXEL (sf);
816
  else if (fg == FACE_TTY_DEFAULT_BG_COLOR)
817 818 819
    fg = FRAME_BACKGROUND_PIXEL (sf);
  if (bg == FACE_TTY_DEFAULT_COLOR || bg == FACE_TTY_DEFAULT_BG_COLOR)
    bg = FRAME_BACKGROUND_PIXEL (sf);
820
  else if (bg == FACE_TTY_DEFAULT_FG_COLOR)
821 822 823
    bg = FRAME_FOREGROUND_PIXEL (sf);

  /* Make sure highlighted lines really stand out, come what may.  */
824
  if (fp->tty_reverse_p && (fg == dflt_fg && bg == dflt_bg))
825 826 827 828 829 830
    {
      unsigned long tem = fg;

      fg = bg;
      bg = tem;
    }
831 832 833 834 835 836 837 838
  /* If the user requested inverse video, obey.  */
  if (inverse_video)
    {
      unsigned long tem2 = fg;

      fg = bg;
      bg = tem2;
    }
839
  if (tty->termscript)
840
    fprintf (tty->termscript, "<FACE %d: %lu/%lu[FG:%lu/BG:%lu]>", face,
841
	     fp->foreground, fp->background, fg, bg);
842 843 844 845 846 847 848 849 850 851
  if (fg >= 0 && fg < 16)
    {
      ScreenAttrib &= 0xf0;
      ScreenAttrib |= fg;
    }
  if (bg >= 0 && bg < 16)
    {
      ScreenAttrib &= 0x0f;
      ScreenAttrib |= ((bg & 0x0f) << 4);
    }
Kim F. Storm's avatar
Kim F. Storm committed
852 853
}

Eli Zaretskii's avatar
Eli Zaretskii committed
854 855
/* According to RBIL (INTERRUP.A, V-1000), 160 is the maximum possible
   width of a DOS display in any known text mode.  We multiply by 2 to
Juanma Barranquero's avatar
Juanma Barranquero committed
856
   accommodate the screen attribute byte.  */
Eli Zaretskii's avatar
Eli Zaretskii committed
857 858
#define MAX_SCREEN_BUF 160*2

859 860
extern unsigned char *encode_terminal_code (struct glyph *, int,
					    struct coding_system *);
861

862
static void
863
IT_write_glyphs (struct frame *f, struct glyph *str, int str_len)
Kim F. Storm's avatar
Kim F. Storm committed
864
{
Eli Zaretskii's avatar
Eli Zaretskii committed
865
  unsigned char screen_buf[MAX_SCREEN_BUF], *screen_bp, *bp;
866
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
867
  register int sl = str_len;
868
  struct tty_display_info *tty = FRAME_TTY (f);
869
  struct frame *sf;
870
  unsigned char *conversion_buffer;
Morten Welinder's avatar
Morten Welinder committed
871

872 873 874 875 876 877 878
  /* If terminal_coding does any conversion, use it, otherwise use
     safe_terminal_coding.  We can't use CODING_REQUIRE_ENCODING here
     because it always returns 1 if terminal_coding.src_multibyte is 1.  */
  struct coding_system *coding = FRAME_TERMINAL_CODING (f);

  if (!(coding->common_flags & CODING_REQUIRE_ENCODING_MASK))
    coding = &safe_terminal_coding;
879

880
  if (str_len <= 0) return;
Eli Zaretskii's avatar
Eli Zaretskii committed
881

Juanma Barranquero's avatar
Juanma Barranquero committed
882
  sf = SELECTED_FRAME ();
883 884 885 886 887 888 889

  /* Since faces get cached and uncached behind our back, we can't
     rely on their indices in the cache being consistent across
     invocations.  So always reset the screen face to the default
     face of the frame, before writing glyphs, and let the glyphs
     set the right face if it's different from the default.  */
  IT_set_face (DEFAULT_FACE_ID);
Eli Zaretskii's avatar
Eli Zaretskii committed
890

891 892
  /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
     the tail.  */
893
  coding->mode &= ~CODING_MODE_LAST_BLOCK;
Eli Zaretskii's avatar
Eli Zaretskii committed
894
  screen_bp = &screen_buf[0];
895
  while (sl > 0)
896
    {
897
      int cf;
Eli Zaretskii's avatar
Eli Zaretskii committed
898
      int n;
899

Eli Zaretskii's avatar
Eli Zaretskii committed
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
      /* If the face of this glyph is different from the current
	 screen face, update the screen attribute byte.  */
      cf = str->face_id;
      if (cf != screen_face)
	IT_set_face (cf);	/* handles invalid faces gracefully */

      /* Identify a run of glyphs with the same face.  */
      for (n = 1; n < sl; ++n)
	if (str[n].face_id != cf)
	  break;

      if (n >= sl)
	/* This is the last glyph.  */
	coding->mode |= CODING_MODE_LAST_BLOCK;

      conversion_buffer = encode_terminal_code (str, n, coding);
      if (coding->produced > 0)
917
	{
Eli Zaretskii's avatar
Eli Zaretskii committed
918 919
	  /* Copy the encoded bytes to the screen buffer.  */
	  for (bp = conversion_buffer; coding->produced--; bp++)
920
	    {
Eli Zaretskii's avatar
Eli Zaretskii committed
921 922 923
	      /* Paranoia: discard bytes that would overrun the end of
		 the screen buffer.  */
	      if (screen_bp - screen_buf <= MAX_SCREEN_BUF - 2)
924
		{
Eli Zaretskii's avatar
Eli Zaretskii committed
925 926
		  *screen_bp++ = (unsigned char)*bp;
		  *screen_bp++ = ScreenAttrib;
927
		}
Eli Zaretskii's avatar
Eli Zaretskii committed
928 929
	      if (tty->termscript)
		fputc (*bp, tty->termscript);
930 931
	    }
	}
Eli Zaretskii's avatar
Eli Zaretskii committed
932 933 934
      /* Update STR and its remaining length.  */
      str += n;
      sl -= n;
935 936
    }

Eli Zaretskii's avatar
Eli Zaretskii committed
937
  /* Dump whatever we have in the screen buffer.  */
Kim F. Storm's avatar
Kim F. Storm committed
938
  mouse_off_maybe ();
939
  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
940
  if (screen_virtual_segment)
941 942
    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
943
}
944

945 946 947 948
/************************************************************************
			  Mouse Highlight (and friends..)
 ************************************************************************/

949
/* Last window where we saw the mouse.  Used by mouse-autoselect-window.  */
950 951
static Lisp_Object last_mouse_window;

952 953
static int mouse_preempted = 0;	/* non-zero when XMenu gobbles mouse events */

954 955
int
popup_activated (void)
956
{
957
  return mouse_preempted;
958 959
}

960
/* Draw TEXT_AREA glyphs between START and END of glyph row ROW on
961 962
   window W.  X is relative to TEXT_AREA in W.  HL is a face override
   for drawing the glyphs.  */
963
void
964 965 966
tty_draw_row_with_mouse_face (struct window *w, struct glyph_row *row,
			      int start_hpos, int end_hpos,
			      enum draw_glyphs_face hl)
967 968
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
969
  struct tty_display_info *tty = FRAME_TTY (f);
970
  Mouse_HLInfo *hlinfo = &tty->mouse_highlight;