msdos.c 141 KB
Newer Older
1
/* MS-DOS specific C utilities.          -*- coding: raw-text -*-
2
   Copyright (C) 1993, 94, 95, 96, 97, 1999 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
#include "msdos.h"
#include "systime.h"
#include "termhooks.h"
52
#include "termchar.h"
Morten Welinder's avatar
Morten Welinder committed
53
#include "dispextern.h"
54
#include "dosfns.h"
Morten Welinder's avatar
Morten Welinder committed
55
#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"
63
#include "blockinput.h"
Eli Zaretskii's avatar
Eli Zaretskii committed
64
#include "keyboard.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
65 66 67 68 69 70 71
#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

72 73 74 75
#ifndef _USE_LFN
#define _USE_LFN 0
#endif

76 77 78 79
#ifndef _dos_ds
#define _dos_ds _go32_info_block.selector_for_linear_memory
#endif

80 81
#if __DJGPP__ > 1

Richard M. Stallman's avatar
Richard M. Stallman committed
82
#include <signal.h>
83
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
84

85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
#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 */
104 105 106 107 108 109

static unsigned long
event_timestamp ()
{
  struct time t;
  unsigned long s;
Kim F. Storm's avatar
Kim F. Storm committed
110
  
111 112 113 114 115 116
  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
117
  
118 119 120
  return s;
}

Kim F. Storm's avatar
Kim F. Storm committed
121 122 123 124 125 126

/* ------------------------ 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
127

Eli Zaretskii's avatar
Eli Zaretskii committed
128 129 130 131
/* 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
132 133
int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;
Richard M. Stallman's avatar
Richard M. Stallman committed
134

Kim F. Storm's avatar
Kim F. Storm committed
135 136
static int mouse_last_x;
static int mouse_last_y;
Richard M. Stallman's avatar
Richard M. Stallman committed
137

Kim F. Storm's avatar
Kim F. Storm committed
138 139
static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;
Richard M. Stallman's avatar
Richard M. Stallman committed
140

Kim F. Storm's avatar
Kim F. Storm committed
141 142
void
mouse_on ()
Richard M. Stallman's avatar
Richard M. Stallman committed
143 144 145
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
146
  if (have_mouse > 0 && !mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
147
    {
Kim F. Storm's avatar
Kim F. Storm committed
148 149 150 151 152
      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
153 154 155
    }
}

Kim F. Storm's avatar
Kim F. Storm committed
156 157
void
mouse_off ()
Richard M. Stallman's avatar
Richard M. Stallman committed
158
{
Kim F. Storm's avatar
Kim F. Storm committed
159
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
160

Kim F. Storm's avatar
Kim F. Storm committed
161
  if (have_mouse > 0 && mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
162
    {
Kim F. Storm's avatar
Kim F. Storm committed
163 164 165 166 167
      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
168 169 170
    }
}

171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
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: ",
191 192 193
  "Set the number of mouse buttons to use by Emacs.\n\
This is useful with mice that report the number of buttons inconsistently,\n\
e.g., if the number of buttons is reported as 3, but Emacs only sees 2 of\n\
194 195 196 197 198 199 200 201 202
them.  This happens with wheeled mice on Windows 9X, for example.")
  (nbuttons)
     Lisp_Object nbuttons;
{
  CHECK_NUMBER (nbuttons, 0);
  mouse_setup_buttons (XINT (nbuttons));
  return Qnil;
}

203 204 205 206 207 208 209 210 211 212 213
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
214 215 216
void
mouse_moveto (x, y)
     int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
217
{
Kim F. Storm's avatar
Kim F. Storm committed
218
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
219

Kim F. Storm's avatar
Kim F. Storm committed
220 221 222 223 224 225
  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
226 227
}

Kim F. Storm's avatar
Kim F. Storm committed
228 229 230
static int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
231
{
Kim F. Storm's avatar
Kim F. Storm committed
232
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
233

Kim F. Storm's avatar
Kim F. Storm committed
234 235 236 237 238 239 240 241
  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
242 243
}

Kim F. Storm's avatar
Kim F. Storm committed
244 245 246
static int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
247 248 249
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
250 251 252 253 254 255 256 257
  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
258 259
}

260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
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
279 280 281 282 283 284 285 286 287
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;
288 289 290 291 292
  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
293

294
  *f = SELECTED_FRAME();
Kim F. Storm's avatar
Kim F. Storm committed
295 296 297
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
298 299
  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
Kim F. Storm's avatar
Kim F. Storm committed
300
}
Richard M. Stallman's avatar
Richard M. Stallman committed
301

Kim F. Storm's avatar
Kim F. Storm committed
302 303
static void
mouse_check_moved ()
Richard M. Stallman's avatar
Richard M. Stallman committed
304
{
305
  int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
306

Kim F. Storm's avatar
Kim F. Storm committed
307
  mouse_get_xy (&x, &y);
308
  SELECTED_FRAME()->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
Kim F. Storm's avatar
Kim F. Storm committed
309 310 311
  mouse_last_x = x;
  mouse_last_y = y;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
312

Eli Zaretskii's avatar
Eli Zaretskii committed
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328
/* 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
329 330 331 332
void
mouse_init ()
{
  union REGS regs;
333

Kim F. Storm's avatar
Kim F. Storm committed
334 335
  if (termscript)
    fprintf (termscript, "<M_INIT>");
Richard M. Stallman's avatar
Richard M. Stallman committed
336

Kim F. Storm's avatar
Kim F. Storm committed
337 338
  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
339

340 341 342 343
  /* 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
344
  mouse_clear_clicks ();
345

Kim F. Storm's avatar
Kim F. Storm committed
346 347 348 349
  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
350

Kim F. Storm's avatar
Kim F. Storm committed
351 352 353 354
  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
355

Kim F. Storm's avatar
Kim F. Storm committed
356 357 358
  mouse_moveto (0, 0);
  mouse_visible = 0;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
359

Kim F. Storm's avatar
Kim F. Storm committed
360 361 362
/* ------------------------- Screen control ----------------------
 *
 */
363

Kim F. Storm's avatar
Kim F. Storm committed
364
static int internal_terminal = 0;
365

Kim F. Storm's avatar
Kim F. Storm committed
366 367 368 369
#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;
370

Kim F. Storm's avatar
Kim F. Storm committed
371 372 373
static int screen_size_X;
static int screen_size_Y;
static int screen_size;
Richard M. Stallman's avatar
Richard M. Stallman committed
374

Kim F. Storm's avatar
Kim F. Storm committed
375 376 377 378
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
379

Kim F. Storm's avatar
Kim F. Storm committed
380 381 382 383 384
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;
385
static unsigned char startup_screen_attrib;
Richard M. Stallman's avatar
Richard M. Stallman committed
386

387 388
static clock_t startup_time;

Kim F. Storm's avatar
Kim F. Storm committed
389
static int term_setup_done;
Richard M. Stallman's avatar
Richard M. Stallman committed
390

391 392
static unsigned short outside_cursor;

Kim F. Storm's avatar
Kim F. Storm committed
393
/* Similar to the_only_frame.  */
394
struct x_output the_only_x_display;
Richard M. Stallman's avatar
Richard M. Stallman committed
395

396 397 398 399 400 401 402 403
/* 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;
404 405
/* A flag to control how to display unibyte 8-bit characters.  */
extern int unibyte_display_via_language_environment;
406

407 408
Lisp_Object Qbar;

409 410 411 412 413 414 415 416
#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;

417
  if (offset < 0 || count < 0)	/* paranoia; invalid values crash DOS/V */
418 419
    return;

420 421 422 423 424 425 426 427
  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

428
static void
Kim F. Storm's avatar
Kim F. Storm committed
429 430 431 432 433
dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
Richard M. Stallman's avatar
Richard M. Stallman committed
434
{
435 436
  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
437
  int l0 = len;
438 439

#if (__DJGPP__ < 2)
Kim F. Storm's avatar
Kim F. Storm committed
440 441 442 443
  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
444 445 446 447
#else
  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
448 449 450

  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
451
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
452
}
453
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
454 455 456

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

Kim F. Storm's avatar
Kim F. Storm committed
457
#if (__DJGPP__ < 2)
458
static void
459
do_visible_bell (xorattr)
Richard M. Stallman's avatar
Richard M. Stallman committed
460 461
     unsigned char xorattr;
{
462
  asm volatile
463
    ("  movb   $1,%%dl
Richard M. Stallman's avatar
Richard M. Stallman committed
464
visible_bell_0:
465
	movl   _ScreenPrimary,%%eax
466
	call   dosmemsetup
467 468 469 470
	movl   %%eax,%%ebx
	movl   %1,%%ecx
	movb   %0,%%al
	incl   %%ebx
Richard M. Stallman's avatar
Richard M. Stallman committed
471
visible_bell_1:
472 473 474
	xorb   %%al,%%gs:(%%ebx)
	addl   $2,%%ebx
	decl   %%ecx
475
	jne    visible_bell_1
476
	decb   %%dl
477
	jne    visible_bell_3
Richard M. Stallman's avatar
Richard M. Stallman committed
478
visible_bell_2:
479 480 481 482 483
	movzwl %%ax,%%eax
        movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	decw   %%cx
484 485
	jne    visible_bell_2
	jmp    visible_bell_0
486 487
visible_bell_3:"
     : /* no output */
Kim F. Storm's avatar
Kim F. Storm committed
488
     : "m" (xorattr), "g" (screen_size)
489
     : "%eax", "%ebx", /* "%gs",*/ "%ecx", "%edx");
Richard M. Stallman's avatar
Richard M. Stallman committed
490 491
}

Kim F. Storm's avatar
Kim F. Storm committed
492 493 494 495 496 497 498 499 500 501 502 503 504
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

505 506
static int blink_bit = -1;	/* the state of the blink bit at startup */

507 508 509 510 511 512
/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

513 514 515 516 517
  /* 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;

518 519 520 521 522
  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

523 524 525 526 527 528 529 530 531 532 533 534 535 536 537
/* 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);
    }
}

538 539 540 541 542 543 544 545 546 547 548 549 550
/* 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;
}

551 552
/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
553

554 555 556 557 558 559 560 561 562 563 564 565 566 567 568
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;

  mouse_off ();
569
  have_vga = vga_installed ();
570

571
  /* If the user specified a special video mode for these dimensions,
572 573 574 575 576 577 578 579 580 581
     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);
582 583 584 585 586 587 588 589 590

      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);
	}
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
    }

  /* 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)
620
	       _set_screen_lines (std_dimension[i].rows);
621 622
	     break;
	   }
623
	 i++;
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
	}
    }

#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 ();
672

673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
#if __DJGPP__ > 1
  /* If the dimensions changed, the mouse highlight info is invalid.  */
  if (current_rows != *rows || current_cols != *cols)
    {
      struct frame *f = SELECTED_FRAME();
      struct display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
      Lisp_Object window = dpyinfo->mouse_face_window;

      if (! NILP (window) && XFRAME (XWINDOW (window)->frame) == f)
	{
	  dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
	  dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
	  dpyinfo->mouse_face_window = Qnil;
	}
    }
#endif

690 691
  /* Enable bright background colors.  */
  bright_bg ();
692 693 694 695 696

  /* 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);
697 698
}

699 700
/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
701 702

static void
Kim F. Storm's avatar
Kim F. Storm committed
703
mouse_off_maybe ()
704
{
Kim F. Storm's avatar
Kim F. Storm committed
705 706 707 708 709 710 711 712 713 714 715 716
  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
#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)
{
#if __DJGPP__ > 1
  unsigned desired_cursor;
  __dpmi_regs regs;
  int max_line, top_line, bot_line;

  /* Avoid the costly BIOS call if F isn't the currently selected
     frame.  Allow for NULL as unconditionally meaning the selected
     frame.  */
  if (f && f != SELECTED_FRAME())
    return;

  /* 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);
#endif /* __DJGPP__ > 1 */
}

static void
IT_set_cursor_type (struct frame *f, Lisp_Object cursor_type)
{
  if (EQ (cursor_type, Qbar))
    {
      /* Just BAR means the normal EGA/VGA cursor.  */
      msdos_set_cursor_shape (f, DEFAULT_CURSOR_START, DEFAULT_CURSOR_WIDTH);
    }
  else if (CONSP (cursor_type) && EQ (XCAR (cursor_type), Qbar))
    {
      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
    /* 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);
}

841 842
static void
IT_ring_bell (void)
Kim F. Storm's avatar
Kim F. Storm committed
843 844
{
  if (visible_bell)
845
    {
Kim F. Storm's avatar
Kim F. Storm committed
846 847
      mouse_off ();
      ScreenVisualBell ();
848
    }
Kim F. Storm's avatar
Kim F. Storm committed
849
  else
850 851 852 853 854 855
    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
856 857
}

858 859 860 861 862
/* 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
863 864 865
static void
IT_set_face (int face)
{
866
  struct frame *sf = SELECTED_FRAME();
867 868 869
  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;
Kim F. Storm's avatar
Kim F. Storm committed
870

871
  if (!fp)
872
    {
873
      fp = dfp;
874 875 876 877 878
      /* The default face for the frame should always be realized and
	 cached.  */
      if (!fp)
	abort ();
    }
Kim F. Storm's avatar
Kim F. Storm committed
879
  screen_face = face;
880 881
  fg = fp->foreground;
  bg = fp->background;
882 883
  dflt_fg = dfp->foreground;
  dflt_bg = dfp->background;
884

885 886 887 888 889 890
  /* Don't use invalid colors.  In particular, FACE_TTY_DEFAULT_*
     colors mean use the colors of the default face, except that if
     highlight is on, invert the foreground and the background.  Note
     that we assume all 16 colors to be available for the background,
     since Emacs switches on this mode (and loses the blinking
     attribute) at startup.  */
891
  if (fg == FACE_TTY_DEFAULT_COLOR || fg == FACE_TTY_DEFAULT_FG_COLOR)
892
    fg = FRAME_FOREGROUND_PIXEL (sf);
893
  else if (fg == FACE_TTY_DEFAULT_BG_COLOR)
894 895 896
    fg = FRAME_BACKGROUND_PIXEL (sf);
  if (bg == FACE_TTY_DEFAULT_COLOR || bg == FACE_TTY_DEFAULT_BG_COLOR)
    bg = FRAME_BACKGROUND_PIXEL (sf);
897
  else if (bg == FACE_TTY_DEFAULT_FG_COLOR)
898 899 900 901
    bg = FRAME_FOREGROUND_PIXEL (sf);

  /* Make sure highlighted lines really stand out, come what may.  */
  if ((highlight || fp->tty_reverse_p)
902
      && (fg == dflt_fg && bg == dflt_bg))
903 904 905 906 907 908
    {
      unsigned long tem = fg;

      fg = bg;
      bg = tem;
    }
909
  if (termscript)
910 911
    fprintf (termscript, "<FACE %d%s: %d/%d[FG:%d/BG:%d]>", face,
	     highlight ? "H" : "", fp->foreground, fp->background, fg, bg);
912 913 914 915 916 917 918 919 920 921
  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
922 923
}

924 925
Lisp_Object Vdos_unsupported_char_glyph;

926
static void
927
IT_write_glyphs (struct glyph *str, int str_len)
Kim F. Storm's avatar
Kim F. Storm committed
928
{
929 930 931
  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);
932
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
933 934 935 936
  register int sl = str_len;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

937 938 939 940 941 942 943
  /* 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 =
    (terminal_coding.common_flags & CODING_REQUIRE_ENCODING_MASK
     ? &terminal_coding
     : &safe_terminal_coding);
944
  struct frame *sf;
Morten Welinder's avatar
Morten Welinder committed
945

946 947 948
  /* Do we need to consider conversion of unibyte characters to
     multibyte?  */
  int convert_unibyte_characters
949 950
    = (NILP (current_buffer->enable_multibyte_characters)
       && unibyte_display_via_language_environment);
951

952 953 954
  unsigned char conversion_buffer[256];
  int conversion_buffer_size = sizeof conversion_buffer;

955
  if (str_len <= 0) return;
956
  
957 958
  screen_buf = screen_bp = alloca (str_len * 2);
  screen_buf_end = screen_buf + str_len * 2;
959
  sf = SELECTED_FRAME();
960 961 962 963 964 965 966

  /* 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);
967
  
968 969 970 971 972
  /* 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)
    {
973
      int cf, chlen, enclen;
974
      unsigned char workbuf[MAX_MULTIBYTE_LENGTH], *buf;
975
      unsigned ch;
976 977 978 979

      /* 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.  */
980
      if (CHAR_GLYPH_PADDING_P (*str))
981 982 983 984 985 986
	{
	  str++;
	  sl--;
	}
      else
	{
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
	  register GLYPH g = GLYPH_FROM_CHAR_GLYPH (*str);
	  int glyph_not_in_table = 0;

	  if (g < 0 || g >= tlen)
	    {
	      /* This glyph doesn't have an entry in Vglyph_table.  */
	      ch = str->u.ch;
	      glyph_not_in_table = 1;
	    }
	  else
	    {
	      /* This glyph has an entry in Vglyph_table, so process
		 any aliases before testing for simpleness.  */
	      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
	      ch = FAST_GLYPH_CHAR (g);
	    }

1004
	  /* Convert the character code to multibyte, if they
1005 1006 1007 1008
	     requested display via language environment.  We only want
	     to convert unibyte characters to multibyte in unibyte
	     buffers!  Otherwise, the 8-bit value in CH came from the
	     display table set up to display foreign characters.  */
1009
	  if (SINGLE_BYTE_CHAR_P (ch) && convert_unibyte_characters
1010 1011
	      && (ch >= 0240
		  || (ch >= 0200 && !NILP (Vnonascii_translation_table))))
1012 1013 1014
	    ch = unibyte_char_to_multibyte (ch);

	  /* Invalid characters are displayed with a special glyph.  */
1015
	  if (! CHAR_VALID_P (ch, 0))
1016 1017 1018
	    {
	      g = !NILP (Vdos_unsupported_char_glyph)
		? Vdos_unsupported_char_glyph
1019
		: MAKE_GLYPH (sf, '\177', GLYPH_FACE (sf, g));
1020 1021 1022 1023 1024 1025 1026 1027 1028
	      ch = FAST_GLYPH_CHAR (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 */

1029
	  if (glyph_not_in_table || GLYPH_SIMPLE_P (tbase, tlen, g))
1030 1031 1032 1033 1034
	    {
	      /* We generate the multi-byte form of CH in WORKBUF.  */
	      chlen = CHAR_STRING (ch, workbuf);
	      buf = workbuf;
	    }
1035 1036 1037 1038 1039 1040 1041
	  else
	    {
	      /* We have a string in Vglyph_table.  */
	      chlen = GLYPH_LENGTH (tbase, g);
	      buf = GLYPH_STRING (tbase, g);
	    }

1042
	  /* If the character is not multibyte, don't bother converting it.  */
1043 1044 1045 1046 1047 1048 1049 1050
	  if (chlen == 1)
	    {
	      *conversion_buffer = (unsigned char)ch;
	      chlen = 0;
	      enclen = 1;
	    }
	  else
	    {
1051
	      coding->src_multibyte = 1;
1052 1053 1054 1055 1056 1057 1058 1059 1060
	      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 == '?')
		{
1061
		  unsigned char *cbp = conversion_buffer;
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118

		  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--;
	    }
	}
1119 1120
    }

1121
  /* Dump whatever is left in the screen buffer.  */
Kim F. Storm's avatar
Kim F. Storm committed
1122
  mouse_off_maybe ();
1123
  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
1124
  if (screen_virtual_segment)
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
    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)
	{
1135
	  screen_buf = alloca (coding->produced * 2);
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
	  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
1153
}
1154

1155 1156 1157 1158 1159 1160 1161
/************************************************************************
			  Mouse Highlight (and friends..)
 ************************************************************************/

/* This is used for debugging, to turn off note_mouse_highlight.  */
int disable_mouse_highlight;

1162 1163 1164
/* If non-nil, dos_rawgetc generates an event to display that string.
   (The display is done in keyboard.c:read_char, by calling
   show_help_echo.)  */
1165 1166 1167
static Lisp_Object help_echo;
static Lisp_Object previous_help_echo; /* a helper temporary variable */

1168 1169 1170 1171 1172 1173
/* These record the window, the object and the position where the help
   echo string was generated.  */
static Lisp_Object help_echo_window;
static Lisp_Object help_echo_object;
static int help_echo_pos;

1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
static int mouse_preempted = 0;	/* non-zero when XMenu gobbles mouse events */

/* Set the mouse pointer shape according to whether it is in the
   area where the mouse highlight is in effect.  */
static void
IT_set_mouse_pointer (int mode)
{
  /* A no-op for now.  DOS text-mode mouse pointer doesn't offer too
     many possibilities to change its shape, and the available
     functionality pretty much sucks (e.g., almost every reasonable
     shape will conceal the character it is on).  Since the color of
     the pointer changes in the highlighted area, it is not clear to
     me whether anything else is required, anyway.  */
}

/* Display the active region described by mouse_face_*
   in its mouse-face if HL > 0, in its normal face if HL = 0.  */
static void
show_mouse_face (struct display_info *dpyinfo, int hl)
{
  struct window *w = XWINDOW (dpyinfo->mouse_face_window);
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  int i;
  struct face *fp;

  
  /* If window is in the process of being destroyed, don't bother
     doing anything.  */
  if (w->current_matrix == NULL)
    goto set_cursor_shape;

  /* Recognize when we are called to operate on rows that don't exist
     anymore.  This can happen when a window is split.  */
  if (dpyinfo->mouse_face_end_row >= w->current_matrix->nrows)
    goto set_cursor_shape;

  /* There's no sense to do anything if the mouse face isn't realized.  */
  if (hl > 0)
    {
      fp = FACE_FROM_ID (SELECTED_FRAME(), dpyinfo->mouse_face_face_id);
      if (!fp)
	goto set_cursor_shape;
    }

  /* Note that mouse_face_beg_row etc. are window relative.  */
  for (i = dpyinfo->mouse_face_beg_row;
       i <= dpyinfo->mouse_face_end_row;
       i++)
    {
      int start_hpos, end_hpos;
      struct glyph_row *row = MATRIX_ROW (w->current_matrix, i);

      /* Don't do anything if row doesn't have valid contents.  */
      if (!row->enabled_p)
	continue;

      /* For all but the first row, the highlight starts at column 0.  */
      if (i == dpyinfo->mouse_face_beg_row)
	start_hpos = dpyinfo->mouse_face_beg_col;
      else
	start_hpos = 0;

      if (i == dpyinfo->mouse_face_end_row)
	end_hpos = dpyinfo->mouse_face_end_col;
      else
	end_hpos = row->used[TEXT_AREA];

      if (end_hpos <= start_hpos)
	continue;
1243 1244 1245
      /* Record that some glyphs of this row are displayed in
         mouse-face.  */
      row->mouse_face_p = hl > 0;
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347