msdos.c 142 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
them.  This happens with wheeled mice on Windows 9X, for example.")
  (nbuttons)
     Lisp_Object nbuttons;
{
198 199
  int n;

200
  CHECK_NUMBER (nbuttons, 0);
201 202 203 204 205 206
  n = XINT (nbuttons);
  if (n < 2 || n > 3)
    Fsignal (Qargs_out_of_range,
	     Fcons (build_string ("only 2 or 3 mouse buttons are supported"),
		    Fcons (nbuttons, Qnil)));
  mouse_setup_buttons (n);
207 208 209
  return Qnil;
}

210 211 212 213 214 215 216 217 218 219 220
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
221 222 223
void
mouse_moveto (x, y)
     int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
224
{
Kim F. Storm's avatar
Kim F. Storm committed
225
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
226

Kim F. Storm's avatar
Kim F. Storm committed
227 228 229 230 231 232
  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
233 234
}

Kim F. Storm's avatar
Kim F. Storm committed
235 236 237
static int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
238
{
Kim F. Storm's avatar
Kim F. Storm committed
239
  union REGS regs;
Richard M. Stallman's avatar
Richard M. Stallman committed
240

Kim F. Storm's avatar
Kim F. Storm committed
241 242 243 244 245 246 247 248
  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
249 250
}

Kim F. Storm's avatar
Kim F. Storm committed
251 252 253
static int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
Richard M. Stallman's avatar
Richard M. Stallman committed
254 255 256
{
  union REGS regs;

Kim F. Storm's avatar
Kim F. Storm committed
257 258 259 260 261 262 263 264
  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 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
265 266
}

267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285
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
286 287 288 289 290 291 292 293 294
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;
295 296 297 298 299
  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
300

301
  *f = SELECTED_FRAME();
Kim F. Storm's avatar
Kim F. Storm committed
302 303 304
  *bar_window = Qnil;
  mouse_get_xy (&ix, &iy);
  *time = event_timestamp ();
305 306
  *x = make_number (mouse_last_x = ix);
  *y = make_number (mouse_last_y = iy);
Kim F. Storm's avatar
Kim F. Storm committed
307
}
Richard M. Stallman's avatar
Richard M. Stallman committed
308

Kim F. Storm's avatar
Kim F. Storm committed
309 310
static void
mouse_check_moved ()
Richard M. Stallman's avatar
Richard M. Stallman committed
311
{
312
  int x, y;
Richard M. Stallman's avatar
Richard M. Stallman committed
313

Kim F. Storm's avatar
Kim F. Storm committed
314
  mouse_get_xy (&x, &y);
315
  SELECTED_FRAME()->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
Kim F. Storm's avatar
Kim F. Storm committed
316 317 318
  mouse_last_x = x;
  mouse_last_y = y;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
319

Eli Zaretskii's avatar
Eli Zaretskii committed
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
/* 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
336 337 338 339
void
mouse_init ()
{
  union REGS regs;
340

Kim F. Storm's avatar
Kim F. Storm committed
341 342
  if (termscript)
    fprintf (termscript, "<M_INIT>");
Richard M. Stallman's avatar
Richard M. Stallman committed
343

Kim F. Storm's avatar
Kim F. Storm committed
344 345
  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
346

347 348 349 350
  /* 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
351
  mouse_clear_clicks ();
352

Kim F. Storm's avatar
Kim F. Storm committed
353 354 355 356
  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
357

Kim F. Storm's avatar
Kim F. Storm committed
358 359 360 361
  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
362

Kim F. Storm's avatar
Kim F. Storm committed
363 364 365
  mouse_moveto (0, 0);
  mouse_visible = 0;
}
Richard M. Stallman's avatar
Richard M. Stallman committed
366

Kim F. Storm's avatar
Kim F. Storm committed
367 368 369
/* ------------------------- Screen control ----------------------
 *
 */
370

Kim F. Storm's avatar
Kim F. Storm committed
371
static int internal_terminal = 0;
372

Kim F. Storm's avatar
Kim F. Storm committed
373 374 375 376
#ifndef HAVE_X_WINDOWS
extern unsigned char ScreenAttrib;
static int screen_face;
static int highlight;
377

Kim F. Storm's avatar
Kim F. Storm committed
378 379 380
static int screen_size_X;
static int screen_size_Y;
static int screen_size;
Richard M. Stallman's avatar
Richard M. Stallman committed
381

Kim F. Storm's avatar
Kim F. Storm committed
382 383 384 385
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
386

Kim F. Storm's avatar
Kim F. Storm committed
387 388 389 390 391
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;
392
static unsigned char startup_screen_attrib;
Richard M. Stallman's avatar
Richard M. Stallman committed
393

394 395
static clock_t startup_time;

Kim F. Storm's avatar
Kim F. Storm committed
396
static int term_setup_done;
Richard M. Stallman's avatar
Richard M. Stallman committed
397

398 399
static unsigned short outside_cursor;

Kim F. Storm's avatar
Kim F. Storm committed
400
/* Similar to the_only_frame.  */
401
struct x_output the_only_x_display;
Richard M. Stallman's avatar
Richard M. Stallman committed
402

403 404 405 406 407 408 409 410
/* 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;
411 412
/* A flag to control how to display unibyte 8-bit characters.  */
extern int unibyte_display_via_language_environment;
413

414 415
Lisp_Object Qbar;

416 417 418 419 420 421 422 423
#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;

424
  if (offset < 0 || count < 0)	/* paranoia; invalid values crash DOS/V */
425 426
    return;

427 428 429 430 431 432 433 434
  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

435
static void
Kim F. Storm's avatar
Kim F. Storm committed
436 437 438 439 440
dos_direct_output (y, x, buf, len)
     int y;
     int x;
     char *buf;
     int len;
Richard M. Stallman's avatar
Richard M. Stallman committed
441
{
442 443
  int t0 = 2 * (x + y * screen_size_X);
  int t = t0 + (int) ScreenPrimary;
444
  int l0 = len;
445 446

#if (__DJGPP__ < 2)
Kim F. Storm's avatar
Kim F. Storm committed
447 448 449 450
  while (--len >= 0) {
    dosmemput (buf++, 1, t);
    t += 2;
  }
451 452 453 454
#else
  /* This is faster.  */
  for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
    _farnspokeb (t, *buf);
455 456 457

  if (screen_virtual_segment)
    dosv_refresh_virtual_screen (t0, l0);
458
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
459
}
460
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
461 462 463

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

Kim F. Storm's avatar
Kim F. Storm committed
464
#if (__DJGPP__ < 2)
465
static void
466
do_visible_bell (xorattr)
Richard M. Stallman's avatar
Richard M. Stallman committed
467 468
     unsigned char xorattr;
{
469
  asm volatile
470
    ("  movb   $1,%%dl
Richard M. Stallman's avatar
Richard M. Stallman committed
471
visible_bell_0:
472
	movl   _ScreenPrimary,%%eax
473
	call   dosmemsetup
474 475 476 477
	movl   %%eax,%%ebx
	movl   %1,%%ecx
	movb   %0,%%al
	incl   %%ebx
Richard M. Stallman's avatar
Richard M. Stallman committed
478
visible_bell_1:
479 480 481
	xorb   %%al,%%gs:(%%ebx)
	addl   $2,%%ebx
	decl   %%ecx
482
	jne    visible_bell_1
483
	decb   %%dl
484
	jne    visible_bell_3
Richard M. Stallman's avatar
Richard M. Stallman committed
485
visible_bell_2:
486 487 488 489 490
	movzwl %%ax,%%eax
        movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	movzwl %%ax,%%eax
	decw   %%cx
491 492
	jne    visible_bell_2
	jmp    visible_bell_0
493 494
visible_bell_3:"
     : /* no output */
Kim F. Storm's avatar
Kim F. Storm committed
495
     : "m" (xorattr), "g" (screen_size)
496
     : "%eax", "%ebx", /* "%gs",*/ "%ecx", "%edx");
Richard M. Stallman's avatar
Richard M. Stallman committed
497 498
}

Kim F. Storm's avatar
Kim F. Storm committed
499 500 501 502 503 504 505 506 507 508 509 510 511
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

512 513
static int blink_bit = -1;	/* the state of the blink bit at startup */

514 515 516 517 518 519
/* Enable bright background colors.  */
static void
bright_bg (void)
{
  union REGS regs;

520 521 522 523 524
  /* 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;

525 526 527 528 529
  regs.h.bl = 0;
  regs.x.ax = 0x1003;
  int86 (0x10, &regs, &regs);
}

530 531 532 533 534 535 536 537 538 539 540 541 542 543 544
/* 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);
    }
}

545 546 547 548 549 550 551 552 553 554 555 556 557
/* 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;
}

558 559
/* Set the screen dimensions so that it can show no less than
   ROWS x COLS frame.  */
560

561 562 563 564 565 566 567 568 569 570 571 572 573 574 575
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 ();
576
  have_vga = vga_installed ();
577

578
  /* If the user specified a special video mode for these dimensions,
579 580 581 582 583 584 585 586 587 588
     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);
589 590 591 592 593 594 595 596 597

      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);
	}
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
    }

  /* 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)
627
	       _set_screen_lines (std_dimension[i].rows);
628 629
	     break;
	   }
630
	 i++;
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
	}
    }

#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 ();
679

680 681 682 683 684
  /* Update Emacs' notion of screen dimensions.  */
  screen_size_X = *cols;
  screen_size_Y = *rows;
  screen_size = *cols * *rows;

685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
#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

702 703
  /* Enable bright background colors.  */
  bright_bg ();
704 705 706 707 708

  /* 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);
709 710
}

711 712
/* If we write a character in the position where the mouse is,
   the mouse cursor may need to be refreshed.  */
713 714

static void
Kim F. Storm's avatar
Kim F. Storm committed
715
mouse_off_maybe ()
716
{
Kim F. Storm's avatar
Kim F. Storm committed
717 718 719 720 721 722 723 724 725 726 727 728
  int x, y;
  
  if (!mouse_visible)
    return;
  
  mouse_get_xy (&x, &y);
  if (y != new_pos_Y || x < new_pos_X)
    return;
  
  mouse_off ();
}

729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
#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);
}

853 854
static void
IT_ring_bell (void)
Kim F. Storm's avatar
Kim F. Storm committed
855 856
{
  if (visible_bell)
857
    {
Kim F. Storm's avatar
Kim F. Storm committed
858 859
      mouse_off ();
      ScreenVisualBell ();
860
    }
Kim F. Storm's avatar
Kim F. Storm committed
861
  else
862 863 864 865 866 867
    {
      union REGS inregs, outregs;
      inregs.h.ah = 2;
      inregs.h.dl = 7;
      intdos (&inregs, &outregs);
    }
868 869
}

870 871 872 873 874
/* 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
875 876 877
static void
IT_set_face (int face)
{
878
  struct frame *sf = SELECTED_FRAME();
879 880 881
  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
882

883
  if (!fp)
884
    {
885
      fp = dfp;
886 887 888 889 890
      /* The default face for the frame should always be realized and
	 cached.  */
      if (!fp)
	abort ();
    }
Kim F. Storm's avatar
Kim F. Storm committed
891
  screen_face = face;
892 893
  fg = fp->foreground;
  bg = fp->background;
894 895
  dflt_fg = dfp->foreground;
  dflt_bg = dfp->background;
896

897 898 899 900 901 902
  /* 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.  */
903
  if (fg == FACE_TTY_DEFAULT_COLOR || fg == FACE_TTY_DEFAULT_FG_COLOR)
904
    fg = FRAME_FOREGROUND_PIXEL (sf);
905
  else if (fg == FACE_TTY_DEFAULT_BG_COLOR)
906 907 908
    fg = FRAME_BACKGROUND_PIXEL (sf);
  if (bg == FACE_TTY_DEFAULT_COLOR || bg == FACE_TTY_DEFAULT_BG_COLOR)
    bg = FRAME_BACKGROUND_PIXEL (sf);
909
  else if (bg == FACE_TTY_DEFAULT_FG_COLOR)
910 911 912 913
    bg = FRAME_FOREGROUND_PIXEL (sf);

  /* Make sure highlighted lines really stand out, come what may.  */
  if ((highlight || fp->tty_reverse_p)
914
      && (fg == dflt_fg && bg == dflt_bg))
915 916 917 918 919 920
    {
      unsigned long tem = fg;

      fg = bg;
      bg = tem;
    }
921
  if (termscript)
922 923
    fprintf (termscript, "<FACE %d%s: %d/%d[FG:%d/BG:%d]>", face,
	     highlight ? "H" : "", fp->foreground, fp->background, fg, bg);
924 925 926 927 928 929 930 931 932 933
  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
934 935
}

936 937
Lisp_Object Vdos_unsupported_char_glyph;

938
static void
939
IT_write_glyphs (struct glyph *str, int str_len)
Kim F. Storm's avatar
Kim F. Storm committed
940
{
941 942 943
  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);
944
  int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
945 946 947 948
  register int sl = str_len;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

949 950 951 952 953 954 955
  /* 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);
956
  struct frame *sf;
Morten Welinder's avatar
Morten Welinder committed
957

958 959 960
  /* Do we need to consider conversion of unibyte characters to
     multibyte?  */
  int convert_unibyte_characters
961 962
    = (NILP (current_buffer->enable_multibyte_characters)
       && unibyte_display_via_language_environment);
963

964 965 966
  unsigned char conversion_buffer[256];
  int conversion_buffer_size = sizeof conversion_buffer;

967
  if (str_len <= 0) return;
968
  
969 970
  screen_buf = screen_bp = alloca (str_len * 2);
  screen_buf_end = screen_buf + str_len * 2;
971
  sf = SELECTED_FRAME();
972 973 974 975 976 977 978

  /* 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);
979
  
980 981 982 983 984
  /* 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)
    {
985
      int cf, chlen, enclen;
986
      unsigned char workbuf[MAX_MULTIBYTE_LENGTH], *buf;
987
      unsigned ch;
988 989 990 991

      /* 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.  */
992
      if (CHAR_GLYPH_PADDING_P (*str))
993 994 995 996 997 998
	{
	  str++;
	  sl--;
	}
      else
	{
999 1000 1001
	  register GLYPH g = GLYPH_FROM_CHAR_GLYPH (*str);
	  int glyph_not_in_table = 0;

1002 1003 1004
	  /* If g is negative, it means we have a multibyte character
	     in *str.  That's what GLYPH_FROM_CHAR_GLYPH returns for
	     multibyte characters.  */
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	  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);
	    }

1019
	  /* Convert the character code to multibyte, if they
1020 1021 1022 1023
	     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.  */
1024
	  if (SINGLE_BYTE_CHAR_P (ch) && convert_unibyte_characters
1025 1026
	      && (ch >= 0240
		  || (ch >= 0200 && !NILP (Vnonascii_translation_table))))
1027 1028 1029
	    ch = unibyte_char_to_multibyte (ch);

	  /* Invalid characters are displayed with a special glyph.  */
1030
	  if (! CHAR_VALID_P (ch, 0))
1031 1032 1033
	    {
	      g = !NILP (Vdos_unsupported_char_glyph)
		? Vdos_unsupported_char_glyph
1034
		: MAKE_GLYPH (sf, '\177', GLYPH_FACE (sf, g));
1035 1036 1037 1038 1039
	      ch = FAST_GLYPH_CHAR (g);
	    }

	  /* If the face of this glyph is different from the current
	     screen face, update the screen attribute byte.  */
1040
	  cf = str->face_id;
1041 1042 1043
	  if (cf != screen_face)
	    IT_set_face (cf);	/* handles invalid faces gracefully */

1044
	  if (glyph_not_in_table || GLYPH_SIMPLE_P (tbase, tlen, g))
1045 1046 1047 1048 1049
	    {
	      /* We generate the multi-byte form of CH in WORKBUF.  */
	      chlen = CHAR_STRING (ch, workbuf);
	      buf = workbuf;
	    }
1050 1051 1052 1053 1054 1055 1056
	  else
	    {
	      /* We have a string in Vglyph_table.  */
	      chlen = GLYPH_LENGTH (tbase, g);
	      buf = GLYPH_STRING (tbase, g);
	    }

1057
	  /* If the character is not multibyte, don't bother converting it.  */
1058 1059 1060 1061 1062 1063 1064 1065
	  if (chlen == 1)
	    {
	      *conversion_buffer = (unsigned char)ch;
	      chlen = 0;
	      enclen = 1;
	    }
	  else
	    {
1066
	      coding->src_multibyte = 1;
1067 1068 1069 1070 1071 1072 1073 1074 1075
	      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 == '?')
		{
1076
		  unsigned char *cbp = conversion_buffer;
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 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133

		  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--;
	    }
	}
1134 1135
    }

1136
  /* Dump whatever is left in the screen buffer.  */
Kim F. Storm's avatar
Kim F. Storm committed
1137
  mouse_off_maybe ();
1138
  dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
1139
  if (screen_virtual_segment)
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
    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)
	{
1150
	  screen_buf = alloca (coding->produced * 2);
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	  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
1168
}
1169

1170 1171 1172 1173 1174 1175 1176
/************************************************************************
			  Mouse Highlight (and friends..)
 ************************************************************************/

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

1177 1178 1179
/* 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.)  */
1180 1181 1182
static Lisp_Object help_echo;
static Lisp_Object previous_help_echo; /* a helper temporary variable */

1183 1184 1185 1186 1187 1188
/* 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;

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 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
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;
1258 1259 1260
      /* Record that some glyphs of this row are displayed in
         mouse-face.  */
      row->mouse_face_p = hl > 0;
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283