msdos.c 140 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"
Richard M. Stallman's avatar
Richard M. Stallman committed
64 65 66 67 68 69 70
#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

71 72 73 74
#ifndef _USE_LFN
#define _USE_LFN 0
#endif

75 76 77 78
#ifndef _dos_ds
#define _dos_ds _go32_info_block.selector_for_linear_memory
#endif

79 80
#if __DJGPP__ > 1

Richard M. Stallman's avatar
Richard M. Stallman committed
81
#include <signal.h>
82
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
83

84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
#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 */
103 104 105 106 107 108

static unsigned long
event_timestamp ()
{
  struct time t;
  unsigned long s;
Kim F. Storm's avatar
Kim F. Storm committed
109
  
110 111 112 113 114 115
  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
116
  
117 118 119
  return s;
}

Kim F. Storm's avatar
Kim F. Storm committed
120 121 122 123 124 125

/* ------------------------ 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
126

Eli Zaretskii's avatar
Eli Zaretskii committed
127 128 129 130
/* 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
131 132
int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
static int mouse_visible;
Richard M. Stallman's avatar
Richard M. Stallman committed
133

Kim F. Storm's avatar
Kim F. Storm committed
134 135
static int mouse_last_x;
static int mouse_last_y;
Richard M. Stallman's avatar
Richard M. Stallman committed
136

Kim F. Storm's avatar
Kim F. Storm committed
137 138
static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;
Richard M. Stallman's avatar
Richard M. Stallman committed
139

Kim F. Storm's avatar
Kim F. Storm committed
140 141
void
mouse_on ()
Richard M. Stallman's avatar
Richard M. Stallman committed
142 143 144
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
145
  if (have_mouse > 0 && !mouse_visible)
Richard M. Stallman's avatar
Richard M. Stallman committed
146
    {
Kim F. Storm's avatar
Kim F. Storm committed
147 148 149 150 151
      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
152 153 154
    }
}

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

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
    {
Kim F. Storm's avatar
Kim F. Storm committed
162 163 164 165 166
      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
167 168 169
    }
}

170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
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: ",
190 191 192
  "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\
193 194 195 196 197 198 199 200 201
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;
}

202 203 204 205 206 207 208 209 210 211 212
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
213 214 215
void
mouse_moveto (x, y)
     int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
216
{
Kim F. Storm's avatar
Kim F. Storm committed
217
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
218

Kim F. Storm's avatar
Kim F. Storm committed
219 220 221 222 223 224
  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
225 226
}

Kim F. Storm's avatar
Kim F. Storm committed
227 228 229
static int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
230
{
Kim F. Storm's avatar
Kim F. Storm committed
231
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
232

Kim F. Storm's avatar
Kim F. Storm committed
233 234 235 236 237 238 239 240
  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
241 242
}

Kim F. Storm's avatar
Kim F. Storm committed
243 244 245
static int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
246 247 248
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
249 250 251 252 253 254 255 256
  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
257 258
}

259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
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
278 279 280 281 282 283 284 285 286
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;
287 288 289 290 291
  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
292

293
  *f = SELECTED_FRAME();
Kim F. Storm's avatar
Kim F. Storm committed
294 295 296
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
297 298
  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
Kim F. Storm's avatar
Kim F. Storm committed
299
}
Richard M. Stallman's avatar
Richard M. Stallman committed
300

Kim F. Storm's avatar
Kim F. Storm committed
301 302
static void
mouse_check_moved ()
Richard M. Stallman's avatar
Richard M. Stallman committed
303
{
304
  int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
305

Kim F. Storm's avatar
Kim F. Storm committed
306
  mouse_get_xy (&x, &y);
307
  SELECTED_FRAME()->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
Kim F. Storm's avatar
Kim F. Storm committed
308 309 310
  mouse_last_x = x;
  mouse_last_y = y;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
311

Kim F. Storm's avatar
Kim F. Storm committed
312 313 314 315
void
mouse_init ()
{
  union REGS regs;
316
  int b;
317

Kim F. Storm's avatar
Kim F. Storm committed
318 319
  if (termscript)
    fprintf (termscript, "<M_INIT>");
Richard M. Stallman's avatar
Richard M. Stallman committed
320

Kim F. Storm's avatar
Kim F. Storm committed
321 322
  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
323

324 325 326 327 328 329 330 331 332 333 334 335
  /* 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
336 337 338 339
  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
340

Kim F. Storm's avatar
Kim F. Storm committed
341 342 343 344
  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
345

Kim F. Storm's avatar
Kim F. Storm committed
346 347 348
  mouse_moveto (0, 0);
  mouse_visible = 0;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
349

Kim F. Storm's avatar
Kim F. Storm committed
350 351 352
/* ------------------------- Screen control ----------------------
 *
 */
353

Kim F. Storm's avatar
Kim F. Storm committed
354
static int internal_terminal = 0;
355

Kim F. Storm's avatar
Kim F. Storm committed
356 357 358 359
#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;
360

Kim F. Storm's avatar
Kim F. Storm committed
361 362 363
static int screen_size_X;
static int screen_size_Y;
static int screen_size;
Richard M. Stallman's avatar
Richard M. Stallman committed
364

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

Kim F. Storm's avatar
Kim F. Storm committed
370 371 372 373 374
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;
375
static unsigned char startup_screen_attrib;
Richard M. Stallman's avatar
Richard M. Stallman committed
376

377 378
static clock_t startup_time;

Kim F. Storm's avatar
Kim F. Storm committed
379
static int term_setup_done;
Richard M. Stallman's avatar
Richard M. Stallman committed
380

381 382
static unsigned short outside_cursor;

Kim F. Storm's avatar
Kim F. Storm committed
383
/* Similar to the_only_frame.  */
384
struct x_output the_only_x_display;
Richard M. Stallman's avatar
Richard M. Stallman committed
385

386 387 388 389 390 391 392 393
/* 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;
394 395
/* A flag to control how to display unibyte 8-bit characters.  */
extern int unibyte_display_via_language_environment;
396

397 398
Lisp_Object Qbar;

399 400 401 402 403 404 405 406
#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;

407
  if (offset < 0 || count < 0)	/* paranoia; invalid values crash DOS/V */
408 409
    return;

410 411 412 413 414 415 416 417
  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

418
static void
Kim F. Storm's avatar
Kim F. Storm committed
419 420 421 422 423
dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
Richard M. Stallman's avatar
Richard M. Stallman committed
424
{
425 426
  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
427
  int l0 = len;
428 429

#if (__DJGPP__ < 2)
Kim F. Storm's avatar
Kim F. Storm committed
430 431 432 433
  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
434 435 436 437
#else
  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
438 439 440

  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
441
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
442
}
443
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
444 445 446

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

Kim F. Storm's avatar
Kim F. Storm committed
447
#if (__DJGPP__ < 2)
448
static void
449
do_visible_bell (xorattr)
Richard M. Stallman's avatar
Richard M. Stallman committed
450 451
     unsigned char xorattr;
{
452
  asm volatile
453
    ("  movb   $1,%%dl
Richard M. Stallman's avatar
Richard M. Stallman committed
454
visible_bell_0:
455
	movl   _ScreenPrimary,%%eax
456
	call   dosmemsetup
457 458 459 460
	movl   %%eax,%%ebx
	movl   %1,%%ecx
	movb   %0,%%al
	incl   %%ebx
Richard M. Stallman's avatar
Richard M. Stallman committed
461
visible_bell_1:
462 463 464
	xorb   %%al,%%gs:(%%ebx)
	addl   $2,%%ebx
	decl   %%ecx
465
	jne    visible_bell_1
466
	decb   %%dl
467
	jne    visible_bell_3
Richard M. Stallman's avatar
Richard M. Stallman committed
468
visible_bell_2:
469 470 471 472 473
	movzwl %%ax,%%eax
        movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	decw   %%cx
474 475
	jne    visible_bell_2
	jmp    visible_bell_0
476 477
visible_bell_3:"
     : /* no output */
Kim F. Storm's avatar
Kim F. Storm committed
478
     : "m" (xorattr), "g" (screen_size)
479
     : "%eax", "%ebx", /* "%gs",*/ "%ecx", "%edx");
Richard M. Stallman's avatar
Richard M. Stallman committed
480 481
}

Kim F. Storm's avatar
Kim F. Storm committed
482 483 484 485 486 487 488 489 490 491 492 493 494
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

495 496
static int blink_bit = -1;	/* the state of the blink bit at startup */

497 498 499 500 501 502
/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

503 504 505 506 507
  /* 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;

508 509 510 511 512
  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

513 514 515 516 517 518 519 520 521 522 523 524 525 526 527
/* 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);
    }
}

528 529 530 531 532 533 534 535 536 537 538 539 540
/* 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;
}

541 542
/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
543

544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
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 ();
559
  have_vga = vga_installed ();
560

561
  /* If the user specified a special video mode for these dimensions,
562 563 564 565 566 567 568 569 570 571
     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);
572 573 574 575 576 577 578 579 580

      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);
	}
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
    }

  /* 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)
610
	       _set_screen_lines (std_dimension[i].rows);
611 612
	     break;
	   }
613
	 i++;
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
	}
    }

#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 ();
662

663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
#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

680 681
  /* Enable bright background colors.  */
  bright_bg ();
682 683 684 685 686

  /* 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);
687 688
}

689 690
/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
691 692

static void
Kim F. Storm's avatar
Kim F. Storm committed
693
mouse_off_maybe ()
694
{
Kim F. Storm's avatar
Kim F. Storm committed
695 696 697 698 699 700 701 702 703 704 705 706
  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
#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);
}

831 832
static void
IT_ring_bell (void)
Kim F. Storm's avatar
Kim F. Storm committed
833 834
{
  if (visible_bell)
835
    {
Kim F. Storm's avatar
Kim F. Storm committed
836 837
      mouse_off ();
      ScreenVisualBell ();
838
    }
Kim F. Storm's avatar
Kim F. Storm committed
839
  else
840 841 842 843 844 845
    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
846 847
}

848 849 850 851 852
/* 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
853 854 855
static void
IT_set_face (int face)
{
856 857
  struct frame *sf = SELECTED_FRAME();
  struct face *fp = FACE_FROM_ID (sf, face);
858
  unsigned long fg, bg;
Kim F. Storm's avatar
Kim F. Storm committed
859

860
  if (!fp)
861
    {
862
      fp = FACE_FROM_ID (sf, DEFAULT_FACE_ID);
863 864 865 866 867
      /* The default face for the frame should always be realized and
	 cached.  */
      if (!fp)
	abort ();
    }
Kim F. Storm's avatar
Kim F. Storm committed
868
  screen_face = face;
869 870 871
  fg = fp->foreground;
  bg = fp->background;

872 873 874 875 876 877
  /* 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.  */
878
  if (fg == FACE_TTY_DEFAULT_COLOR || fg == FACE_TTY_DEFAULT_FG_COLOR)
879
    fg = FRAME_FOREGROUND_PIXEL (sf);
880
  else if (fg == FACE_TTY_DEFAULT_BG_COLOR)
881 882 883
    fg = FRAME_BACKGROUND_PIXEL (sf);
  if (bg == FACE_TTY_DEFAULT_COLOR || bg == FACE_TTY_DEFAULT_BG_COLOR)
    bg = FRAME_BACKGROUND_PIXEL (sf);
884
  else if (bg == FACE_TTY_DEFAULT_FG_COLOR)
885 886 887 888 889 890 891 892 893 894 895 896
    bg = FRAME_FOREGROUND_PIXEL (sf);

  /* Make sure highlighted lines really stand out, come what may.  */
  if ((highlight || fp->tty_reverse_p)
      && (fg == FRAME_FOREGROUND_PIXEL (sf)
	  && bg == FRAME_BACKGROUND_PIXEL (sf)))
    {
      unsigned long tem = fg;

      fg = bg;
      bg = tem;
    }
897
  if (termscript)
898 899
    fprintf (termscript, "<FACE %d%s: %d/%d[FG:%d/BG:%d]>", face,
	     highlight ? "H" : "", fp->foreground, fp->background, fg, bg);
900 901 902 903 904 905 906 907 908 909
  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
910 911
}

912 913
Lisp_Object Vdos_unsupported_char_glyph;

914
static void
915
IT_write_glyphs (struct glyph *str, int str_len)
Kim F. Storm's avatar
Kim F. Storm committed
916
{
917 918 919
  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);
920
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
921 922 923 924
  register int sl = str_len;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

925 926 927 928 929 930 931
  /* 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);
932
  struct frame *sf;
Morten Welinder's avatar
Morten Welinder committed
933

934 935 936
  /* Do we need to consider conversion of unibyte characters to
     multibyte?  */
  int convert_unibyte_characters
937 938
    = (NILP (current_buffer->enable_multibyte_characters)
       && unibyte_display_via_language_environment);
939

940
  if (str_len <= 0) return;
941
  
942 943
  screen_buf = screen_bp = alloca (str_len * 2);
  screen_buf_end = screen_buf + str_len * 2;
944
  sf = SELECTED_FRAME();
945 946 947 948 949 950 951

  /* 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);
952
  
953 954 955 956 957
  /* 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)
    {
958
      int cf, chlen, enclen;
959
      unsigned char workbuf[MAX_MULTIBYTE_LENGTH], *buf;
960
      unsigned ch;
961 962 963 964

      /* 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.  */
965
      if (CHAR_GLYPH_PADDING_P (*str))
966 967 968 969 970 971
	{
	  str++;
	  sl--;
	}
      else
	{
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
	  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);
	    }

989
	  /* Convert the character code to multibyte, if they
990 991 992 993
	     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.  */
994
	  if (SINGLE_BYTE_CHAR_P (ch) && convert_unibyte_characters
995 996
	      && (ch >= 0240
		  || (ch >= 0200 && !NILP (Vnonascii_translation_table))))
997 998 999
	    ch = unibyte_char_to_multibyte (ch);

	  /* Invalid characters are displayed with a special glyph.  */
1000
	  if (! CHAR_VALID_P (ch, 0))
1001 1002 1003
	    {
	      g = !NILP (Vdos_unsupported_char_glyph)
		? Vdos_unsupported_char_glyph
1004
		: MAKE_GLYPH (sf, '\177', GLYPH_FACE (sf, g));
1005 1006 1007 1008 1009 1010 1011 1012 1013
	      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 */

1014
	  if (glyph_not_in_table || GLYPH_SIMPLE_P (tbase, tlen, g))
1015 1016 1017 1018 1019
	    {
	      /* We generate the multi-byte form of CH in WORKBUF.  */
	      chlen = CHAR_STRING (ch, workbuf);
	      buf = workbuf;
	    }
1020 1021 1022 1023 1024 1025 1026
	  else
	    {
	      /* We have a string in Vglyph_table.  */
	      chlen = GLYPH_LENGTH (tbase, g);
	      buf = GLYPH_STRING (tbase, g);
	    }

1027
	  /* If the character is not multibyte, don't bother converting it.  */
1028 1029 1030 1031 1032 1033 1034 1035
	  if (chlen == 1)
	    {
	      *conversion_buffer = (unsigned char)ch;
	      chlen = 0;
	      enclen = 1;
	    }
	  else
	    {
1036
	      coding->src_multibyte = 1;
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 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
	      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--;
	    }
	}
1104 1105
    }

1106
  /* Dump whatever is left in the screen buffer.  */
Kim F. Storm's avatar
Kim F. Storm committed
1107
  mouse_off_maybe ();
1108
  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
1109
  if (screen_virtual_segment)
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
    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)
	{
1120
	  screen_buf = alloca (coding->produced * 2);
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	  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
1138
}
1139

1140 1141 1142 1143 1144 1145 1146
/************************************************************************
			  Mouse Highlight (and friends..)
 ************************************************************************/

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

1147 1148 1149
/* 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.)  */
1150 1151 1152
static Lisp_Object help_echo;
static Lisp_Object previous_help_echo; /* a helper temporary variable */

1153 1154 1155 1156 1157 1158
/* 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;

1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 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
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;
1228 1229 1230
      /* Record that some glyphs of this row are displayed in
         mouse-face.  */
      row->mouse_face_p = hl > 0;
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 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 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
      if (hl > 0)
	{
	  int vpos = row->y + WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w);
	  int kstart = start_hpos + WINDOW_DISPLAY_LEFT_EDGE_PIXEL_X (w);
	  int nglyphs = end_hpos - start_hpos;
	  int offset = ScreenPrimary + 2*(vpos*screen_size_X + kstart) + 1;
	  int start_offset = offset;

	  if (termscript)
	    fprintf (termscript, "\n<MH+ %d-%d:%d>",
		     kstart, kstart + nglyphs - 1, vpos);

	  mouse_off ();
	  IT_set_face (dpyinfo->mouse_face_face_id);
	  /* Since we are going to change only the _colors_ of the
	     displayed text, there's no need to go through all the
	     pain of generating and encoding the text from the glyphs.
	     Instead, we simply poke the attribute byte of each
	     affected position in video memory with the colors
	     computed by IT_set_face!  */
	  _farsetsel (_dos_ds);
	  while (nglyphs--)
	    {
	      _farnspokeb (offset, ScreenAttrib);
	      offset += 2;
	    }
	  if (screen_virtual_segment)
	    dosv_refresh_virtual_screen (start_offset, end_hpos - start_hpos);
	  mouse_on ();
	}
      else
	{
	  /* We are removing a previously-drawn mouse highlight.  The
	     safest way to do so is to redraw the glyphs anew, since
	     all kinds of faces and display tables could have changed
	     behind our back.  */
	  int nglyphs = end_hpos - start_hpos;
	  int save_x = new_pos_X, save_y = new_pos_Y;

	  if (end_hpos >= row->used[TEXT_AREA])
	    nglyphs = row->used[TEXT_AREA] - start_hpos;

	  /* IT_write_glyphs writes at cursor position, so we need to
	     temporarily move cursor coordinates to the beginning of
	     the highlight region.  */
	  new_pos_X = start_hpos + WINDOW_DISPLAY_LEFT_EDGE_PIXEL_X (w);
	  new_pos_Y = row->y + WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w);

	  if (termscript)
	    fprintf (termscript, "<MH- %d-%d:%d>",
		     new_pos_X, new_pos_X + nglyphs - 1, new_pos_Y);
	  IT_write_glyphs (row->glyphs[TEXT_AREA] + start_hpos, nglyphs);
	  if (termscript)
	    fputs ("\n", termscript);
	  new_pos_X = save_x;
	  new_pos_Y = save_y;
	}
    }

 set_cursor_shape:
  
  /* Change the mouse pointer shape.  */
  IT_set_mouse_pointer (hl);
}

/* Clear out the mouse-highlighted active region.
   Redraw it un-highlighted first.  */
static void
clear_mouse_face (struct display_info *dpyinfo)
{
  if (! NILP (dpyinfo->mouse_face_window))
    show_mouse_face (dpyinfo, 0);

  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;
}

/* Find the glyph matrix position of buffer position POS in window W.
   *HPOS and *VPOS are set to the positions found.  W's current glyphs
   must be up to date.  If POS is above window start return (0, 0).
   If POS is after end of W, return end of last line in W.  */
static int
fast_find_position (struct window *w, int pos, int *hpos, int *vpos)
{
  int i;
  int lastcol;
  int maybe_next_line_p = 0;
  int line_start_position;
  int yb = window_text_bottom_y (w);
  struct glyph_row *row = MATRIX_ROW (w->current_matrix, 0);
  struct glyph_row *best_row = row;

  while (row->y < yb)
    {
      if (row->used[TEXT_AREA])
	line_start_position = row->glyphs[TEXT_AREA]->charpos;
      else
	line_start_position = 0;

      if (line_start_position > pos)
	break;
      /* If the position sought is the end of the buffer,
	 don't include the blank lines at the bottom of the window.  */
      else if (line_start_position == pos
	       && pos == BUF_ZV (XBUFFER (w->buffer)))
	{
	  maybe_next_line_p = 1;
	  break;
	}
      else if (line_start_position > 0)
	best_row = row;
      
      ++row;
    }
  
  /* Find the right column within BEST_ROW.  */
  lastcol = 0;
  row = best_row;
  for (i = 0; i < row->used[TEXT_AREA]; i++)
    {
      struct glyph *glyph = row->glyphs[TEXT_AREA] + i;
      int charpos;

      charpos = glyph->charpos;
      if (charpos == pos)
	{
	  *hpos = i;
	  *vpos = row->y;
	  return 1;
	}
      else if (charpos > pos)
	break;
      else if (charpos > 0)
	lastcol = i;
    }

  /* If we're looking for the end of the buffer,
     and we didn't find it in the line we scanned,
     use the start of the following line.  */
  if (maybe_next_line_p)
    {
      ++row;
      lastcol = 0;
    }

  *vpos = row->y;
  *hpos = lastcol + 1;
  return 0;
}

/* Take proper action when mouse has moved to the mode or top line of
   window W, x-position X.  MODE_LINE_P non-zero means mouse is on the
   mode line.  X is relative to the start of the text display area of
   W, so the width of bitmap areas and scroll bars must be subtracted
   to get a position relative to the start of the mode line.  */
static void
IT_note_mode_line_highlight (struct window *w, int x, int mode_line_p)
{
  struct frame *f = XFRAME (w->frame);
  struct display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  struct glyph_row *row;

  if (mode_line_p)
    row = MATRIX_MODE_LINE_ROW (w->current_matrix);
  else
    row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
  
  if (row->enabled_p)
    {
      extern Lisp_Object Qhelp_echo;
      struct glyph *glyph, *end;
      Lisp_Object help, map;
      
      /* Find the glyph under X.  */
      glyph = row->glyphs[TEXT_AREA]
	+ x - FRAME_LEFT_SCROLL_BAR_WIDTH (f) * CANON_X_UNIT (f);
      end = glyph + row->used[TEXT_AREA];
      if (glyph < end
	  && STRINGP (glyph->object)
	  && XSTRING (glyph->object)->intervals
	  && glyph->charpos >= 0
	  && glyph->charpos < XSTRING (glyph->object)->size)
	{
	  /* If we're on a string with `help-echo' text property,
	     arrange for the help to be displayed.  This is done by
	     setting the global variable help_echo to the help string.  */
	  help = Fget_text_property (make_number (glyph->charpos),
				     Qhelp_echo, glyph->object);
1420
	  if (!NILP (help))
1421 1422 1423 1424 1425 1426
	    {
	      help_echo = help;
	      XSETWINDOW (help_echo_window, w);
	      help_echo_object = glyph->object;
	      help_echo_pos = glyph->charpos;
	    }
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	}
    }
}

/* Take proper action when the mouse has moved to position X, Y on
   frame F as regards highlighting characters that have mouse-face
   properties.  Also de-highlighting chars where the mouse was before.
   X and Y can be negative or out of range.  */
static void
IT_note_mouse_highlight (struct frame *f, int x, int y)
{
  struct display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int portion;
  Lisp_Object window;
  struct window *w;

  /* When a menu is active, don't highlight because this looks odd.  */
  if (mouse_preempted)
    return;

1447 1448
  if (disable_mouse_highlight
      || !f->glyphs_initialized_p)
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488