src/msdos.c

   1 /* MS-DOS specific C utilities.          -*- coding: cp850 -*-
   2
   3 Copyright (C) 1993-1997, 1999-2013 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Contributed by Morten Welinder */
  21 /* New display, keyboard, and mouse control by Kim F. Storm */
  22
  23 /* Note: This file MUST use a unibyte encoding, to both display the
  24    keys on the non-US keyboard layout as their respective labels, and
  25    provide the correct byte values for the keyboard input to inject
  26    into Emacs.  See 'struct dos_keyboard_map' below.  As long as there
  27    are only European keyboard layouts here, we are OK with DOS
  28    codepage 850 encoding.  */
  29
  30 /* Note: some of the stuff here was taken from end of sysdep.c in demacs. */
  31
  32 #include <config.h>
  33
  34 #ifdef MSDOS
  35 #include <setjmp.h>
  36 #include "lisp.h"
  37 #include <stdio.h>
  38 #include <time.h>
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 /* gettime and settime in dos.h clash with their namesakes from
  42    gnulib, so we move out of our way the prototypes in dos.h.  */
  43 #define gettime dos_h_gettime_
  44 #define settime dos_h_settime_
  45 #include <dos.h>
  46 #undef gettime
  47 #undef settime
  48 #include <errno.h>
  49 #include <sys/stat.h>    /* for _fixpath */
  50 #include <unistd.h>      /* for chdir, dup, dup2, etc. */
  51 #include <dir.h>         /* for getdisk */
  52 #pragma pack(0)          /* dir.h does a pack(4), which isn't GCC's default */
  53 #include <fcntl.h>
  54 #include <io.h>          /* for setmode */
  55 #include <dpmi.h>        /* for __dpmi_xxx stuff */
  56 #include <sys/farptr.h>  /* for _farsetsel, _farnspokeb */
  57 #include <libc/dosio.h>  /* for _USE_LFN */
  58 #include <conio.h>       /* for cputs */
  59
  60 #include "msdos.h"
  61 #include "systime.h"
  62 #include "frame.h"
  63 #include "termhooks.h"
  64 #include "termchar.h"
  65 #include "dispextern.h"
  66 #include "dosfns.h"
  67 #include "termopts.h"
  68 #include "character.h"
  69 #include "coding.h"
  70 #include "disptab.h"
  71 #include "window.h"
  72 #include "buffer.h"
  73 #include "commands.h"
  74 #include "blockinput.h"
  75 #include "keyboard.h"
  76 #include "intervals.h"
  77 #include <go32.h>
  78 #include <pc.h>
  79 #include <ctype.h>
  80 /* #include <process.h> */
  81 /* Damn that local process.h!  Instead we can define P_WAIT and
  82    spawnve ourselves.  */
  83 #define P_WAIT 1
  84 extern int spawnve (int, const char *, char *const [], char *const []);
  85
  86 #ifndef _USE_LFN
  87 #define _USE_LFN 0
  88 #endif
  89
  90 #ifndef _dos_ds
  91 #define _dos_ds _go32_info_block.selector_for_linear_memory
  92 #endif
  93
  94 #include <signal.h>
  95 #include "syssignal.h"
  96
  97 #include "careadlinkat.h"
  98 #include "allocator.h"
  99
 100 #ifndef SYSTEM_MALLOC
 101
 102 #ifdef GNU_MALLOC
 103
 104 /* If other `malloc' than ours is used, force our `sbrk' behave like
 105    Unix programs expect (resize memory blocks to keep them contiguous).
 106    If `sbrk' from `ralloc.c' is NOT used, also zero-out sbrk'ed memory,
 107    because that's what `gmalloc' expects to get.  */
 108 #include <crt0.h>
 109
 110 #ifdef REL_ALLOC
 111 int _crt0_startup_flags = _CRT0_FLAG_UNIX_SBRK;
 112 #else  /* not REL_ALLOC */
 113 int _crt0_startup_flags = (_CRT0_FLAG_UNIX_SBRK | _CRT0_FLAG_FILL_SBRK_MEMORY);
 114 #endif /* not REL_ALLOC */
 115 #endif /* GNU_MALLOC */
 116
 117 #endif /* not SYSTEM_MALLOC */
 118
 119 /* Return the current timestamp in milliseconds since midnight.  */
 120 static unsigned long
 121 event_timestamp (void)
 122 {
 123   struct timespec t;
 124   unsigned long s;
 125
 126   gettime (&t);
 127   s = t.tv_sec;
 128   s %= 86400;
 129   s *= 1000;
 130   s += t.tv_nsec * 1000000;
 131
 132   return s;
 133 }
 134
 135 \f
 136 /* ------------------------ Mouse control ---------------------------
 137  *
 138  * Coordinates are in screen positions and zero based.
 139  * Mouse buttons are numbered from left to right and also zero based.
 140  */
 141
 142 /* This used to be in termhooks.h, but mainstream Emacs code no longer
 143    uses it, and it was removed...  */
 144 #define NUM_MOUSE_BUTTONS (5)
 145
 146 int have_mouse;          /* 0: no, 1: enabled, -1: disabled */
 147 static int mouse_visible;
 148
 149 static int mouse_last_x;
 150 static int mouse_last_y;
 151
 152 static int mouse_button_translate[NUM_MOUSE_BUTTONS];
 153 static int mouse_button_count;
 154
 155 void
 156 mouse_on (void)
 157 {
 158   union REGS regs;
 159
 160   if (have_mouse > 0 && !mouse_visible)
 161     {
 162       struct tty_display_info *tty = CURTTY ();
 163
 164       if (tty->termscript)
 165         fprintf (tty->termscript, "<M_ON>");
 166       regs.x.ax = 0x0001;
 167       int86 (0x33, &regs, &regs);
 168       mouse_visible = 1;
 169     }
 170 }
 171
 172 void
 173 mouse_off (void)
 174 {
 175   union REGS regs;
 176
 177   if (have_mouse > 0 && mouse_visible)
 178     {
 179       struct tty_display_info *tty = CURTTY ();
 180
 181       if (tty->termscript)
 182         fprintf (tty->termscript, "<M_OFF>");
 183       regs.x.ax = 0x0002;
 184       int86 (0x33, &regs, &regs);
 185       mouse_visible = 0;
 186     }
 187 }
 188
 189 static void
 190 mouse_setup_buttons (int n_buttons)
 191 {
 192   if (n_buttons == 3)
 193     {
 194       mouse_button_count = 3;
 195       mouse_button_translate[0] = 0; /* Left */
 196       mouse_button_translate[1] = 2; /* Middle */
 197       mouse_button_translate[2] = 1; /* Right */
 198     }
 199   else  /* two, what else? */
 200     {
 201       mouse_button_count = 2;
 202       mouse_button_translate[0] = 0;
 203       mouse_button_translate[1] = 1;
 204     }
 205 }
 206
 207 DEFUN ("msdos-set-mouse-buttons", Fmsdos_set_mouse_buttons, Smsdos_set_mouse_buttons,
 208        1, 1, "NSet number of mouse buttons to: ",
 209        doc: /* Set the number of mouse buttons to use by Emacs.
 210 This is useful with mice that report the number of buttons inconsistently,
 211 e.g., if the number of buttons is reported as 3, but Emacs only sees 2 of
 212 them.  This happens with wheeled mice on Windows 9X, for example.  */)
 213   (Lisp_Object nbuttons)
 214 {
 215   int n;
 216
 217   CHECK_NUMBER (nbuttons);
 218   n = XINT (nbuttons);
 219   if (n < 2 || n > 3)
 220     xsignal2 (Qargs_out_of_range,
 221               build_string ("only 2 or 3 mouse buttons are supported"),
 222               nbuttons);
 223   mouse_setup_buttons (n);
 224   return Qnil;
 225 }
 226
 227 static void
 228 mouse_get_xy (int *x, int *y)
 229 {
 230   union REGS regs;
 231
 232   regs.x.ax = 0x0003;
 233   int86 (0x33, &regs, &regs);
 234   *x = regs.x.cx / 8;
 235   *y = regs.x.dx / 8;
 236 }
 237
 238 void
 239 mouse_moveto (int x, int y)
 240 {
 241   union REGS regs;
 242   struct tty_display_info *tty = CURTTY ();
 243
 244   if (tty->termscript)
 245     fprintf (tty->termscript, "<M_XY=%dx%d>", x, y);
 246   regs.x.ax = 0x0004;
 247   mouse_last_x = regs.x.cx = x * 8;
 248   mouse_last_y = regs.x.dx = y * 8;
 249   int86 (0x33, &regs, &regs);
 250 }
 251
 252 static int
 253 mouse_pressed (int b, int *xp, int *yp)
 254 {
 255   union REGS regs;
 256
 257   if (b >= mouse_button_count)
 258     return 0;
 259   regs.x.ax = 0x0005;
 260   regs.x.bx = mouse_button_translate[b];
 261   int86 (0x33, &regs, &regs);
 262   if (regs.x.bx)
 263     *xp = regs.x.cx / 8, *yp = regs.x.dx / 8;
 264   return (regs.x.bx != 0);
 265 }
 266
 267 static int
 268 mouse_released (int b, int *xp, int *yp)
 269 {
 270   union REGS regs;
 271
 272   if (b >= mouse_button_count)
 273     return 0;
 274   regs.x.ax = 0x0006;
 275   regs.x.bx = mouse_button_translate[b];
 276   int86 (0x33, &regs, &regs);
 277   if (regs.x.bx)
 278     *xp = regs.x.cx / 8, *yp = regs.x.dx / 8;
 279   return (regs.x.bx != 0);
 280 }
 281
 282 static int
 283 mouse_button_depressed (int b, int *xp, int *yp)
 284 {
 285   union REGS regs;
 286
 287   if (b >= mouse_button_count)
 288     return 0;
 289   regs.x.ax = 0x0003;
 290   int86 (0x33, &regs, &regs);
 291   if ((regs.x.bx & (1 << mouse_button_translate[b])) != 0)
 292     {
 293       *xp = regs.x.cx / 8;
 294       *yp = regs.x.dx / 8;
 295       return 1;
 296     }
 297   return 0;
 298 }
 299
 300 void
 301 mouse_get_pos (struct frame **f, int insist, Lisp_Object *bar_window,
 302                enum scroll_bar_part *part, Lisp_Object *x, Lisp_Object *y,
 303                Time *time)
 304 {
 305   int ix, iy;
 306   Lisp_Object frame, tail;
 307
 308   /* Clear the mouse-moved flag for every frame on this display.  */
 309   FOR_EACH_FRAME (tail, frame)
 310     XFRAME (frame)->mouse_moved = 0;
 311
 312   *f = SELECTED_FRAME ();
 313   *bar_window = Qnil;
 314   mouse_get_xy (&ix, &iy);
 315   *time = event_timestamp ();
 316   *x = make_number (mouse_last_x = ix);
 317   *y = make_number (mouse_last_y = iy);
 318 }
 319
 320 static void
 321 mouse_check_moved (void)
 322 {
 323   int x, y;
 324
 325   mouse_get_xy (&x, &y);
 326   SELECTED_FRAME ()->mouse_moved |= (x != mouse_last_x || y != mouse_last_y);
 327   mouse_last_x = x;
 328   mouse_last_y = y;
 329 }
 330
 331 /* Force the mouse driver to ``forget'' about any button clicks until
 332    now.  */
 333 static void
 334 mouse_clear_clicks (void)
 335 {
 336   int b;
 337
 338   for (b = 0; b < mouse_button_count; b++)
 339     {
 340       int dummy_x, dummy_y;
 341
 342       (void) mouse_pressed (b, &dummy_x, &dummy_y);
 343       (void) mouse_released (b, &dummy_x, &dummy_y);
 344     }
 345 }
 346
 347 void
 348 mouse_init (void)
 349 {
 350   union REGS regs;
 351   struct tty_display_info *tty = CURTTY ();
 352
 353   if (tty->termscript)
 354     fprintf (tty->termscript, "<M_INIT>");
 355
 356   regs.x.ax = 0x0021;
 357   int86 (0x33, &regs, &regs);
 358
 359   /* Reset the mouse last press/release info.  It seems that Windows
 360      doesn't do that automatically when function 21h is called, which
 361      causes Emacs to ``remember'' the click that switched focus to the
 362      window just before Emacs was started from that window.  */
 363   mouse_clear_clicks ();
 364
 365   regs.x.ax = 0x0007;
 366   regs.x.cx = 0;
 367   regs.x.dx = 8 * (ScreenCols () - 1);
 368   int86 (0x33, &regs, &regs);
 369
 370   regs.x.ax = 0x0008;
 371   regs.x.cx = 0;
 372   regs.x.dx = 8 * (ScreenRows () - 1);
 373   int86 (0x33, &regs, &regs);
 374
 375   mouse_moveto (0, 0);
 376   mouse_visible = 0;
 377 }
 378 \f
 379 /* ------------------------- Screen control ----------------------
 380  *
 381  */
 382
 383 static int internal_terminal = 0;
 384
 385 #ifndef HAVE_X_WINDOWS
 386 extern unsigned char ScreenAttrib;
 387 static int screen_face;
 388
 389 static int screen_size_X;
 390 static int screen_size_Y;
 391 static int screen_size;
 392
 393 static int current_pos_X;
 394 static int current_pos_Y;
 395 static int new_pos_X;
 396 static int new_pos_Y;
 397
 398 static void *startup_screen_buffer;
 399 static int startup_screen_size_X;
 400 static int startup_screen_size_Y;
 401 static int startup_pos_X;
 402 static int startup_pos_Y;
 403 static unsigned char startup_screen_attrib;
 404
 405 static clock_t startup_time;
 406
 407 static int term_setup_done;
 408
 409 static unsigned short outside_cursor;
 410
 411 /* The only display since MS-DOS does not support multiple ones.  */
 412 struct tty_display_info the_only_display_info;
 413
 414 /* Support for DOS/V (allows Japanese characters to be displayed on
 415    standard, non-Japanese, ATs).  Only supported for DJGPP v2 and later.  */
 416
 417 /* Holds the address of the text-mode screen buffer.  */
 418 static unsigned long screen_old_address = 0;
 419 /* Segment and offset of the virtual screen.  If 0, DOS/V is NOT loaded.  */
 420 static unsigned short screen_virtual_segment = 0;
 421 static unsigned short screen_virtual_offset = 0;
 422 extern Lisp_Object Qcursor_type;
 423 extern Lisp_Object Qbar, Qhbar;
 424
 425 /* The screen colors of the current frame, which serve as the default
 426    colors for newly-created frames.  */
 427 static int initial_screen_colors[2];
 428
 429 /* Update the screen from a part of relocated DOS/V screen buffer which
 430    begins at OFFSET and includes COUNT characters.  */
 431 static void
 432 dosv_refresh_virtual_screen (int offset, int count)
 433 {
 434   __dpmi_regs regs;
 435
 436   if (offset < 0 || count < 0)  /* paranoia; invalid values crash DOS/V */
 437     return;
 438
 439   regs.h.ah = 0xff;     /* update relocated screen */
 440   regs.x.es = screen_virtual_segment;
 441   regs.x.di = screen_virtual_offset + offset;
 442   regs.x.cx = count;
 443   __dpmi_int (0x10, &regs);
 444 }
 445
 446 static void
 447 dos_direct_output (int y, int x, char *buf, int len)
 448 {
 449   int t0 = 2 * (x + y * screen_size_X);
 450   int t = t0 + (int) ScreenPrimary;
 451   int l0 = len;
 452
 453   /* This is faster.  */
 454   for (_farsetsel (_dos_ds); --len >= 0; t += 2, buf++)
 455     _farnspokeb (t, *buf);
 456
 457   if (screen_virtual_segment)
 458     dosv_refresh_virtual_screen (t0, l0);
 459 }
 460 #endif
 461
 462 #ifndef HAVE_X_WINDOWS
 463
 464 static int blink_bit = -1;      /* the state of the blink bit at startup */
 465
 466 /* Enable bright background colors.  */
 467 static void
 468 bright_bg (void)
 469 {
 470   union REGS regs;
 471
 472   /* Remember the original state of the blink/bright-background bit.
 473      It is stored at 0040:0065h in the BIOS data area.  */
 474   if (blink_bit == -1)
 475     blink_bit = (_farpeekb (_dos_ds, 0x465) & 0x20) == 0x20;
 476
 477   regs.h.bl = 0;
 478   regs.x.ax = 0x1003;
 479   int86 (0x10, &regs, &regs);
 480 }
 481
 482 /* Disable bright background colors (and enable blinking) if we found
 483    the video system in that state at startup.  */
 484 static void
 485 maybe_enable_blinking (void)
 486 {
 487   if (blink_bit == 1)
 488     {
 489       union REGS regs;
 490
 491       regs.h.bl = 1;
 492       regs.x.ax = 0x1003;
 493       int86 (0x10, &regs, &regs);
 494     }
 495 }
 496
 497 /* Return non-zero if the system has a VGA adapter.  */
 498 static int
 499 vga_installed (void)
 500 {
 501   union REGS regs;
 502
 503   regs.x.ax = 0x1a00;
 504   int86 (0x10, &regs, &regs);
 505   if (regs.h.al == 0x1a && regs.h.bl > 5 && regs.h.bl < 13)
 506     return 1;
 507   return 0;
 508 }
 509
 510 /* Set the screen dimensions so that it can show no less than
 511    ROWS x COLS frame.  */
 512
 513 void
 514 dos_set_window_size (int *rows, int *cols)
 515 {
 516   char video_name[30];
 517   union REGS regs;
 518   Lisp_Object video_mode;
 519   int video_mode_value, have_vga = 0;
 520   int current_rows = ScreenRows (), current_cols = ScreenCols ();
 521
 522   if (*rows == current_rows && *cols == current_cols)
 523     return;
 524
 525   mouse_off ();
 526   have_vga = vga_installed ();
 527
 528   /* If the user specified a special video mode for these dimensions,
 529      use that mode.  */
 530   video_mode
 531     = Fsymbol_value (Fintern_soft (make_formatted_string
 532                                    (video_name, "screen-dimensions-%dx%d",
 533                                     *rows, *cols), Qnil));
 534
 535   if (INTEGERP (video_mode)
 536       && (video_mode_value = XINT (video_mode)) > 0)
 537     {
 538       regs.x.ax = video_mode_value;
 539       int86 (0x10, &regs, &regs);
 540
 541       if (have_mouse)
 542         {
 543           /* Must hardware-reset the mouse, or else it won't update
 544              its notion of screen dimensions for some non-standard
 545              video modes.  This is *painfully* slow...  */
 546           regs.x.ax = 0;
 547           int86 (0x33, &regs, &regs);
 548         }
 549     }
 550
 551   /* Find one of the dimensions supported by standard EGA/VGA
 552      which gives us at least the required dimensions.  */
 553   else
 554     {
 555       static struct {
 556         int rows, need_vga;
 557       } std_dimension[] = {
 558           {25, 0},
 559           {28, 1},
 560           {35, 0},
 561           {40, 1},
 562           {43, 0},
 563           {50, 1}
 564       };
 565       int i = 0;
 566
 567       while (i < sizeof (std_dimension) / sizeof (std_dimension[0]))
 568         {
 569          if (std_dimension[i].need_vga <= have_vga
 570              && std_dimension[i].rows >= *rows)
 571            {
 572              if (std_dimension[i].rows != current_rows
 573                  || *cols != current_cols)
 574                _set_screen_lines (std_dimension[i].rows);
 575              break;
 576            }
 577          i++;
 578         }
 579     }
 580
 581
 582   if (have_mouse)
 583     {
 584       mouse_init ();
 585       mouse_on ();
 586     }
 587
 588   /* Tell the caller what dimensions have been REALLY set.  */
 589   *rows = ScreenRows ();
 590   *cols = ScreenCols ();
 591
 592   /* Update Emacs' notion of screen dimensions.  */
 593   screen_size_X = *cols;
 594   screen_size_Y = *rows;
 595   screen_size = *cols * *rows;
 596
 597   /* If the dimensions changed, the mouse highlight info is invalid.  */
 598   if (current_rows != *rows || current_cols != *cols)
 599     {
 600       struct frame *f = SELECTED_FRAME ();
 601       Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
 602       Lisp_Object window = hlinfo->mouse_face_window;
 603
 604       if (! NILP (window) && XFRAME (XWINDOW (window)->frame) == f)
 605         reset_mouse_highlight (hlinfo);
 606     }
 607
 608   /* Enable bright background colors.  */
 609   bright_bg ();
 610
 611   /* FIXME: I'm not sure the above will run at all on DOS/V.  But let's
 612      be defensive anyway.  */
 613   if (screen_virtual_segment)
 614     dosv_refresh_virtual_screen (0, *cols * *rows);
 615 }
 616
 617 /* If we write a character in the position where the mouse is,
 618    the mouse cursor may need to be refreshed.  */
 619
 620 static void
 621 mouse_off_maybe (void)
 622 {
 623   int x, y;
 624
 625   if (!mouse_visible)
 626     return;
 627
 628   mouse_get_xy (&x, &y);
 629   if (y != new_pos_Y || x < new_pos_X)
 630     return;
 631
 632   mouse_off ();
 633 }
 634
 635 #define DEFAULT_CURSOR_START (-1)
 636 #define DEFAULT_CURSOR_WIDTH (-1)
 637 #define BOX_CURSOR_WIDTH     (-32)
 638
 639 /* Set cursor to begin at scan line START_LINE in the character cell
 640    and extend for WIDTH scan lines.  Scan lines are counted from top
 641    of the character cell, starting from zero.  */
 642 static void
 643 msdos_set_cursor_shape (struct frame *f, int start_line, int width)
 644 {
 645   unsigned desired_cursor;
 646   __dpmi_regs regs;
 647   int max_line, top_line, bot_line;
 648   struct tty_display_info *tty = FRAME_TTY (f);
 649
 650   /* Avoid the costly BIOS call if F isn't the currently selected
 651      frame.  Allow for NULL as unconditionally meaning the selected
 652      frame.  */
 653   if (f && f != SELECTED_FRAME ())
 654     return;
 655
 656   if (tty->termscript)
 657     fprintf (tty->termscript, "\nCURSOR SHAPE=(%d,%d)", start_line, width);
 658
 659   /* The character cell size in scan lines is stored at 40:85 in the
 660      BIOS data area.  */
 661   max_line = _farpeekw (_dos_ds, 0x485) - 1;
 662   switch (max_line)
 663     {
 664       default:  /* this relies on CGA cursor emulation being ON! */
 665       case 7:
 666         bot_line = 7;
 667         break;
 668       case 9:
 669         bot_line = 9;
 670         break;
 671       case 13:
 672         bot_line = 12;
 673         break;
 674       case 15:
 675         bot_line = 14;
 676         break;
 677     }
 678
 679   if (width < 0)
 680     {
 681       if (width == BOX_CURSOR_WIDTH)
 682         {
 683           top_line = 0;
 684           bot_line = max_line;
 685         }
 686       else if (start_line != DEFAULT_CURSOR_START)
 687         {
 688           top_line = start_line;
 689           bot_line = top_line - width - 1;
 690         }
 691       else if (width != DEFAULT_CURSOR_WIDTH)
 692         {
 693           top_line = 0;
 694           bot_line = -1 - width;
 695         }
 696       else
 697         top_line = bot_line + 1;
 698     }
 699   else if (width == 0)
 700     {
 701       /* [31, 0] seems to DTRT for all screen sizes.  */
 702       top_line = 31;
 703       bot_line = 0;
 704     }
 705   else  /* WIDTH is positive */
 706     {
 707       if (start_line != DEFAULT_CURSOR_START)
 708         bot_line = start_line;
 709       top_line = bot_line - (width - 1);
 710     }
 711
 712   /* If the current cursor shape is already what they want, we are
 713      history here.  */
 714   desired_cursor = ((top_line & 0x1f) << 8) | (bot_line & 0x1f);
 715   if (desired_cursor == _farpeekw (_dos_ds, 0x460))
 716     return;
 717
 718   regs.h.ah = 1;
 719   regs.x.cx = desired_cursor;
 720   __dpmi_int (0x10, &regs);
 721 }
 722
 723 static void
 724 IT_set_cursor_type (struct frame *f, Lisp_Object cursor_type)
 725 {
 726   if (EQ (cursor_type, Qbar) || EQ (cursor_type, Qhbar))
 727     {
 728       /* Just BAR means the normal EGA/VGA cursor.  */
 729       msdos_set_cursor_shape (f, DEFAULT_CURSOR_START, DEFAULT_CURSOR_WIDTH);
 730     }
 731   else if (CONSP (cursor_type)
 732            && (EQ (XCAR (cursor_type), Qbar)
 733                || EQ (XCAR (cursor_type), Qhbar)))
 734     {
 735       Lisp_Object bar_parms = XCDR (cursor_type);
 736       int width;
 737
 738       if (INTEGERP (bar_parms))
 739         {
 740           /* Feature: negative WIDTH means cursor at the top
 741              of the character cell, zero means invisible cursor.  */
 742           width = XINT (bar_parms);
 743           msdos_set_cursor_shape (f, width >= 0 ? DEFAULT_CURSOR_START : 0,
 744                                   width);
 745         }
 746       else if (CONSP (bar_parms)
 747                && INTEGERP (XCAR (bar_parms))
 748                && INTEGERP (XCDR (bar_parms)))
 749         {
 750           int start_line = XINT (XCDR (bar_parms));
 751
 752           width = XINT (XCAR (bar_parms));
 753           msdos_set_cursor_shape (f, start_line, width);
 754         }
 755     }
 756   else
 757     {
 758       /* Treat anything unknown as "box cursor".  This includes nil, so
 759          that a frame which doesn't specify a cursor type gets a box,
 760          which is the default in Emacs.  */
 761       msdos_set_cursor_shape (f, 0, BOX_CURSOR_WIDTH);
 762     }
 763 }
 764
 765 static void
 766 IT_ring_bell (struct frame *f)
 767 {
 768   if (visible_bell)
 769     {
 770       mouse_off ();
 771       ScreenVisualBell ();
 772     }
 773   else
 774     {
 775       union REGS inregs, outregs;
 776       inregs.h.ah = 2;
 777       inregs.h.dl = 7;
 778       intdos (&inregs, &outregs);
 779     }
 780 }
 781
 782 /* Given a face id FACE, extract the face parameters to be used for
 783    display until the face changes.  The face parameters (actually, its
 784    color) are used to construct the video attribute byte for each
 785    glyph during the construction of the buffer that is then blitted to
 786    the video RAM.  */
 787 static void
 788 IT_set_face (int face)
 789 {
 790   struct frame *sf = SELECTED_FRAME ();
 791   struct face *fp  = FACE_FROM_ID (sf, face);
 792   struct face *dfp = FACE_FROM_ID (sf, DEFAULT_FACE_ID);
 793   unsigned long fg, bg, dflt_fg, dflt_bg;
 794   struct tty_display_info *tty = FRAME_TTY (sf);
 795
 796   if (!fp)
 797     {
 798       fp = dfp;
 799       /* The default face for the frame should always be realized and
 800          cached.  */
 801       if (!fp)
 802         emacs_abort ();
 803     }
 804   screen_face = face;
 805   fg = fp->foreground;
 806   bg = fp->background;
 807   dflt_fg = dfp->foreground;
 808   dflt_bg = dfp->background;
 809
 810   /* Don't use invalid colors.  In particular, FACE_TTY_DEFAULT_* colors
 811      mean use the colors of the default face.  Note that we assume all
 812      16 colors to be available for the background, since Emacs switches
 813      on this mode (and loses the blinking attribute) at startup.  */
 814   if (fg == FACE_TTY_DEFAULT_COLOR || fg == FACE_TTY_DEFAULT_FG_COLOR)
 815     fg = FRAME_FOREGROUND_PIXEL (sf);
 816   else if (fg == FACE_TTY_DEFAULT_BG_COLOR)
 817     fg = FRAME_BACKGROUND_PIXEL (sf);
 818   if (bg == FACE_TTY_DEFAULT_COLOR || bg == FACE_TTY_DEFAULT_BG_COLOR)
 819     bg = FRAME_BACKGROUND_PIXEL (sf);
 820   else if (bg == FACE_TTY_DEFAULT_FG_COLOR)
 821     bg = FRAME_FOREGROUND_PIXEL (sf);
 822
 823   /* Make sure highlighted lines really stand out, come what may.  */
 824   if (fp->tty_reverse_p && (fg == dflt_fg && bg == dflt_bg))
 825     {
 826       unsigned long tem = fg;
 827
 828       fg = bg;
 829       bg = tem;
 830     }
 831   /* If the user requested inverse video, obey.  */
 832   if (inverse_video)
 833     {
 834       unsigned long tem2 = fg;
 835
 836       fg = bg;
 837       bg = tem2;
 838     }
 839   if (tty->termscript)
 840     fprintf (tty->termscript, "<FACE %d: %lu/%lu[FG:%lu/BG:%lu]>", face,
 841              fp->foreground, fp->background, fg, bg);
 842   if (fg >= 0 && fg < 16)
 843     {
 844       ScreenAttrib &= 0xf0;
 845       ScreenAttrib |= fg;
 846     }
 847   if (bg >= 0 && bg < 16)
 848     {
 849       ScreenAttrib &= 0x0f;
 850       ScreenAttrib |= ((bg & 0x0f) << 4);
 851     }
 852 }
 853
 854 /* According to RBIL (INTERRUP.A, V-1000), 160 is the maximum possible
 855    width of a DOS display in any known text mode.  We multiply by 2 to
 856    accommodate the screen attribute byte.  */
 857 #define MAX_SCREEN_BUF 160*2
 858
 859 extern unsigned char *encode_terminal_code (struct glyph *, int,
 860                                             struct coding_system *);
 861
 862 static void
 863 IT_write_glyphs (struct frame *f, struct glyph *str, int str_len)
 864 {
 865   unsigned char screen_buf[MAX_SCREEN_BUF], *screen_bp, *bp;
 866   int offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
 867   register int sl = str_len;
 868   struct tty_display_info *tty = FRAME_TTY (f);
 869   struct frame *sf;
 870   unsigned char *conversion_buffer;
 871
 872   /* If terminal_coding does any conversion, use it, otherwise use
 873      safe_terminal_coding.  We can't use CODING_REQUIRE_ENCODING here
 874      because it always returns 1 if terminal_coding.src_multibyte is 1.  */
 875   struct coding_system *coding = FRAME_TERMINAL_CODING (f);
 876
 877   if (!(coding->common_flags & CODING_REQUIRE_ENCODING_MASK))
 878     coding = &safe_terminal_coding;
 879
 880   if (str_len <= 0) return;
 881
 882   sf = SELECTED_FRAME ();
 883
 884   /* Since faces get cached and uncached behind our back, we can't
 885      rely on their indices in the cache being consistent across
 886      invocations.  So always reset the screen face to the default
 887      face of the frame, before writing glyphs, and let the glyphs
 888      set the right face if it's different from the default.  */
 889   IT_set_face (DEFAULT_FACE_ID);
 890
 891   /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
 892      the tail.  */
 893   coding->mode &= ~CODING_MODE_LAST_BLOCK;
 894   screen_bp = &screen_buf[0];
 895   while (sl > 0)
 896     {
 897       int cf;
 898       int n;
 899
 900       /* If the face of this glyph is different from the current
 901          screen face, update the screen attribute byte.  */
 902       cf = str->face_id;
 903       if (cf != screen_face)
 904         IT_set_face (cf);       /* handles invalid faces gracefully */
 905
 906       /* Identify a run of glyphs with the same face.  */
 907       for (n = 1; n < sl; ++n)
 908         if (str[n].face_id != cf)
 909           break;
 910
 911       if (n >= sl)
 912         /* This is the last glyph.  */
 913         coding->mode |= CODING_MODE_LAST_BLOCK;
 914
 915       conversion_buffer = encode_terminal_code (str, n, coding);
 916       if (coding->produced > 0)
 917         {
 918           /* Copy the encoded bytes to the screen buffer.  */
 919           for (bp = conversion_buffer; coding->produced--; bp++)
 920             {
 921               /* Paranoia: discard bytes that would overrun the end of
 922                  the screen buffer.  */
 923               if (screen_bp - screen_buf <= MAX_SCREEN_BUF - 2)
 924                 {
 925                   *screen_bp++ = (unsigned char)*bp;
 926                   *screen_bp++ = ScreenAttrib;
 927                 }
 928               if (tty->termscript)
 929                 fputc (*bp, tty->termscript);
 930             }
 931         }
 932       /* Update STR and its remaining length.  */
 933       str += n;
 934       sl -= n;
 935     }
 936
 937   /* Dump whatever we have in the screen buffer.  */
 938   mouse_off_maybe ();
 939   dosmemput (screen_buf, screen_bp - screen_buf, (int)ScreenPrimary + offset);
 940   if (screen_virtual_segment)
 941     dosv_refresh_virtual_screen (offset, (screen_bp - screen_buf) / 2);
 942   new_pos_X += (screen_bp - screen_buf) / 2;
 943 }
 944
 945 /************************************************************************
 946                           Mouse Highlight (and friends..)
 947  ************************************************************************/
 948
 949 static int mouse_preempted = 0; /* non-zero when XMenu gobbles mouse events */
 950
 951 int
 952 popup_activated (void)
 953 {
 954   return mouse_preempted;
 955 }
 956
 957 /* Draw TEXT_AREA glyphs between START and END of glyph row ROW on
 958    window W.  X is relative to TEXT_AREA in W.  HL is a face override
 959    for drawing the glyphs.  */
 960 void
 961 tty_draw_row_with_mouse_face (struct window *w, struct glyph_row *row,
 962                               int start_hpos, int end_hpos,
 963                               enum draw_glyphs_face hl)
 964 {
 965   struct frame *f = XFRAME (WINDOW_FRAME (w));
 966   struct tty_display_info *tty = FRAME_TTY (f);
 967   Mouse_HLInfo *hlinfo = &tty->mouse_highlight;
 968
 969   if (hl == DRAW_MOUSE_FACE)
 970     {
 971       int vpos = row->y + WINDOW_TOP_EDGE_Y (w);
 972       int kstart = start_hpos + WINDOW_LEFT_EDGE_X (w);
 973       int nglyphs = end_hpos - start_hpos;
 974       int offset = ScreenPrimary + 2*(vpos*screen_size_X + kstart) + 1;
 975       int start_offset = offset;
 976
 977       if (tty->termscript)
 978         fprintf (tty->termscript, "\n<MH+ %d-%d:%d>",
 979                  kstart, kstart + nglyphs - 1, vpos);
 980
 981       mouse_off ();
 982       IT_set_face (hlinfo->mouse_face_face_id);
 983       /* Since we are going to change only the _colors_ of already
 984          displayed text, there's no need to go through all the pain of
 985          generating and encoding the text from the glyphs.  Instead,
 986          we simply poke the attribute byte of each affected position
 987          in video memory with the colors computed by IT_set_face!  */
 988       _farsetsel (_dos_ds);
 989       while (nglyphs--)
 990         {
 991           _farnspokeb (offset, ScreenAttrib);
 992           offset += 2;
 993         }
 994       if (screen_virtual_segment)
 995         dosv_refresh_virtual_screen (start_offset, end_hpos - start_hpos);
 996       mouse_on ();
 997     }
 998   else if (hl == DRAW_NORMAL_TEXT)
 999     {
1000       /* We are removing a previously-drawn mouse highlight.  The
1001          safest way to do so is to redraw the glyphs anew, since all
1002          kinds of faces and display tables could have changed behind
1003          our back.  */
1004       int nglyphs = end_hpos - start_hpos;
1005       int save_x = new_pos_X, save_y = new_pos_Y;
1006
1007       if (end_hpos >= row->used[TEXT_AREA])
1008         nglyphs = row->used[TEXT_AREA] - start_hpos;
1009
1010       /* IT_write_glyphs writes at cursor position, so we need to
1011          temporarily move cursor coordinates to the beginning of
1012          the highlight region.  */
1013       new_pos_X = start_hpos + WINDOW_LEFT_EDGE_X (w);
1014       new_pos_Y = row->y + WINDOW_TOP_EDGE_Y (w);
1015
1016       if (tty->termscript)
1017         fprintf (tty->termscript, "<MH- %d-%d:%d>",
1018                  new_pos_X, new_pos_X + nglyphs - 1, new_pos_Y);
1019       IT_write_glyphs (f, row->glyphs[TEXT_AREA] + start_hpos, nglyphs);
1020       if (tty->termscript)
1021         fputs ("\n", tty->termscript);
1022       new_pos_X = save_x;
1023       new_pos_Y = save_y;
1024     }
1025 }
1026
1027 static void
1028 IT_clear_end_of_line (struct frame *f, int first_unused)
1029 {
1030   char *spaces, *sp;
1031   int i, j, offset = 2 * (new_pos_X + screen_size_X * new_pos_Y);
1032   struct tty_display_info *tty = FRAME_TTY (f);
1033
1034   if (new_pos_X >= first_unused || fatal_error_in_progress)
1035     return;
1036
1037   IT_set_face (0);
1038   i = (j = first_unused - new_pos_X) * 2;
1039   if (tty->termscript)
1040     fprintf (tty->termscript, "<CLR:EOL[%d..%d)>", new_pos_X, first_unused);
1041   spaces = sp = alloca (i);
1042
1043   while (--j >= 0)
1044     {
1045       *sp++ = ' ';
1046       *sp++ = ScreenAttrib;
1047     }
1048
1049   mouse_off_maybe ();
1050   dosmemput (spaces, i, (int)ScreenPrimary + offset);
1051   if (screen_virtual_segment)
1052     dosv_refresh_virtual_screen (offset, i / 2);
1053
1054   /* clear_end_of_line_raw on term.c leaves the cursor at first_unused.
1055      Let's follow their lead, in case someone relies on this.  */
1056   new_pos_X = first_unused;
1057 }
1058
1059 static void
1060 IT_clear_screen (struct frame *f)
1061 {
1062   struct tty_display_info *tty = FRAME_TTY (f);
1063
1064   if (tty->termscript)
1065     fprintf (tty->termscript, "<CLR:SCR>");
1066   /* We are sometimes called (from clear_garbaged_frames) when a new
1067      frame is being created, but its faces are not yet realized.  In
1068      such a case we cannot call IT_set_face, since it will fail to find
1069      any valid faces and will abort.  Instead, use the initial screen
1070      colors; that should mimic what a Unix tty does, which simply clears
1071      the screen with whatever default colors are in use.  */
1072   if (FACE_FROM_ID (SELECTED_FRAME (), DEFAULT_FACE_ID) == NULL)
1073     ScreenAttrib = (initial_screen_colors[0] << 4) | initial_screen_colors[1];
1074   else
1075     IT_set_face (0);
1076   mouse_off ();
1077   ScreenClear ();
1078   if (screen_virtual_segment)
1079     dosv_refresh_virtual_screen (0, screen_size);
1080   new_pos_X = new_pos_Y = 0;
1081 }
1082
1083 static void
1084 IT_clear_to_end (struct frame *f)
1085 {
1086   struct tty_display_info *tty = FRAME_TTY (f);
1087
1088   if (tty->termscript)
1089     fprintf (tty->termscript, "<CLR:EOS>");
1090
1091   while (new_pos_Y < screen_size_Y) {
1092     new_pos_X = 0;
1093     IT_clear_end_of_line (f, screen_size_X);
1094     new_pos_Y++;
1095   }
1096 }
1097
1098 static void
1099 IT_cursor_to (struct frame *f, int y, int x)
1100 {
1101   struct tty_display_info *tty = FRAME_TTY (f);
1102
1103   if (tty->termscript)
1104     fprintf (tty->termscript, "\n<XY=%dx%d>", x, y);
1105   new_pos_X = x;
1106   new_pos_Y = y;
1107 }
1108
1109 static int cursor_cleared;
1110
1111 static void
1112 IT_display_cursor (int on)
1113 {
1114   struct tty_display_info *tty = CURTTY ();
1115
1116   if (on && cursor_cleared)
1117     {
1118       ScreenSetCursor (current_pos_Y, current_pos_X);
1119       cursor_cleared = 0;
1120       if (tty->termscript)
1121         fprintf (tty->termscript, "\nCURSOR ON (%dx%d)",
1122                  current_pos_Y, current_pos_X);
1123     }
1124   else if (!on && !cursor_cleared)
1125     {
1126       ScreenSetCursor (-1, -1);
1127       cursor_cleared = 1;
1128       if (tty->termscript)
1129         fprintf (tty->termscript, "\nCURSOR OFF (%dx%d)",
1130                  current_pos_Y, current_pos_X);
1131     }
1132 }
1133
1134 /* Emacs calls cursor-movement functions a lot when it updates the
1135    display (probably a legacy of old terminals where you cannot
1136    update a screen line without first moving the cursor there).
1137    However, cursor movement is expensive on MSDOS (it calls a slow
1138    BIOS function and requires 2 mode switches), while actual screen
1139    updates access the video memory directly and don't depend on
1140    cursor position.  To avoid slowing down the redisplay, we cheat:
1141    all functions that move the cursor only set internal variables
1142    which record the cursor position, whereas the cursor is only
1143    moved to its final position whenever screen update is complete.
1144
1145    `IT_cmgoto' is called from the keyboard reading loop and when the
1146    frame update is complete.  This means that we are ready for user
1147    input, so we update the cursor position to show where the point is,
1148    and also make the mouse pointer visible.
1149
1150    Special treatment is required when the cursor is in the echo area,
1151    to put the cursor at the end of the text displayed there.  */
1152
1153 static void
1154 IT_cmgoto (struct frame *f)
1155 {
1156   /* Only set the cursor to where it should be if the display is
1157      already in sync with the window contents.  */
1158   int update_cursor_pos = 1; /* MODIFF == unchanged_modified; */
1159   struct tty_display_info *tty = FRAME_TTY (f);
1160
1161   /* FIXME: This needs to be rewritten for the new redisplay, or
1162      removed.  */
1163 #if 0
1164   static int previous_pos_X = -1;
1165
1166   update_cursor_pos = 1;        /* temporary!!! */
1167
1168   /* If the display is in sync, forget any previous knowledge about
1169      cursor position.  This is primarily for unexpected events like
1170      C-g in the minibuffer.  */
1171   if (update_cursor_pos && previous_pos_X >= 0)
1172     previous_pos_X = -1;
1173   /* If we are in the echo area, put the cursor at the
1174      end of the echo area message.  */
1175   if (!update_cursor_pos
1176       && WINDOW_TOP_EDGE_LINE (XWINDOW (FRAME_MINIBUF_WINDOW (f))) <= new_pos_Y)
1177     {
1178       int tem_X = current_pos_X, dummy;
1179
1180       if (echo_area_glyphs)
1181         {
1182           tem_X = echo_area_glyphs_length;
1183           /* Save current cursor position, to be restored after the
1184              echo area message is erased.  Only remember one level
1185              of previous cursor position.  */
1186           if (previous_pos_X == -1)
1187             ScreenGetCursor (&dummy, &previous_pos_X);
1188         }
1189       else if (previous_pos_X >= 0)
1190         {
1191           /* We wind up here after the echo area message is erased.
1192              Restore the cursor position we remembered above.  */
1193           tem_X = previous_pos_X;
1194           previous_pos_X = -1;
1195         }
1196
1197       if (current_pos_X != tem_X)
1198         {
1199           new_pos_X = tem_X;
1200           update_cursor_pos = 1;
1201         }
1202     }
1203 #endif
1204
1205   if (update_cursor_pos
1206       && (current_pos_X != new_pos_X || current_pos_Y != new_pos_Y))
1207     {
1208       ScreenSetCursor (current_pos_Y = new_pos_Y, current_pos_X = new_pos_X);
1209       if (tty->termscript)
1210         fprintf (tty->termscript, "\n<CURSOR:%dx%d>", current_pos_X, current_pos_Y);
1211     }
1212
1213   /* Maybe cursor is invisible, so make it visible.  */
1214   IT_display_cursor (1);
1215
1216   /* Mouse pointer should be always visible if we are waiting for
1217      keyboard input.  */
1218   if (!mouse_visible)
1219     mouse_on ();
1220 }
1221
1222 static void
1223 IT_update_begin (struct frame *f)
1224 {
1225   struct tty_display_info *display_info = FRAME_DISPLAY_INFO (f);
1226   Mouse_HLInfo *hlinfo = &display_info->mouse_highlight;
1227   struct frame *mouse_face_frame = hlinfo->mouse_face_mouse_frame;
1228
1229   if (display_info->termscript)
1230     fprintf (display_info->termscript, "\n\n<UPDATE_BEGIN");
1231
1232   block_input ();
1233
1234   if (f && f == mouse_face_frame)
1235     {
1236       /* Don't do highlighting for mouse motion during the update.  */
1237       hlinfo->mouse_face_defer = 1;
1238
1239       /* If F needs to be redrawn, simply forget about any prior mouse
1240          highlighting.  */
1241       if (FRAME_GARBAGED_P (f))
1242         hlinfo->mouse_face_window = Qnil;
1243
1244       /* Can we tell that this update does not affect the window
1245          where the mouse highlight is?  If so, no need to turn off.
1246          Likewise, don't do anything if none of the enabled rows
1247          contains glyphs highlighted in mouse face.  */
1248       if (!NILP (hlinfo->mouse_face_window)
1249           && WINDOWP (hlinfo->mouse_face_window))
1250         {
1251           struct window *w = XWINDOW (hlinfo->mouse_face_window);
1252           int i;
1253
1254           /* If the mouse highlight is in the window that was deleted
1255              (e.g., if it was popped by completion), clear highlight
1256              unconditionally.  */
1257           if (NILP (w->contents))
1258             hlinfo->mouse_face_window = Qnil;
1259           else
1260             {
1261               for (i = 0; i < w->desired_matrix->nrows; ++i)
1262                 if (MATRIX_ROW_ENABLED_P (w->desired_matrix, i)
1263                     && MATRIX_ROW (w->current_matrix, i)->mouse_face_p)
1264                   break;
1265             }
1266
1267           if (NILP (w->contents) || i < w->desired_matrix->nrows)
1268             clear_mouse_face (hlinfo);
1269         }
1270     }
1271   else if (mouse_face_frame && !FRAME_LIVE_P (mouse_face_frame))
1272     /* If the frame with mouse highlight was deleted, invalidate the
1273        highlight info.  */
1274     reset_mouse_highlight (hlinfo);
1275
1276   unblock_input ();
1277 }
1278
1279 static void
1280 IT_update_end (struct frame *f)
1281 {
1282   struct tty_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
1283
1284   if (dpyinfo->termscript)
1285     fprintf (dpyinfo->termscript, "\n<UPDATE_END\n");
1286   dpyinfo->mouse_highlight.mouse_face_defer = 0;
1287 }
1288
1289 static void
1290 IT_frame_up_to_date (struct frame *f)
1291 {
1292   Lisp_Object new_cursor, frame_desired_cursor;
1293   struct window *sw;
1294
1295   FRAME_MOUSE_UPDATE (f);
1296
1297   /* Set the cursor type to whatever they wanted.  In a minibuffer
1298      window, we want the cursor to appear only if we are reading input
1299      from this window, and we want the cursor to be taken from the
1300      frame parameters.  For the selected window, we use either its
1301      buffer-local value or the value from the frame parameters if the
1302      buffer doesn't define its local value for the cursor type.  */
1303   sw = XWINDOW (f->selected_window);
1304   frame_desired_cursor = Fcdr (Fassq (Qcursor_type, f->param_alist));
1305   if (cursor_in_echo_area
1306       && FRAME_HAS_MINIBUF_P (f)
1307       && EQ (FRAME_MINIBUF_WINDOW (f), echo_area_window)
1308       && sw == XWINDOW (echo_area_window))
1309     new_cursor = frame_desired_cursor;
1310   else
1311     {
1312       struct buffer *b = XBUFFER (sw->contents);
1313
1314       if (EQ (BVAR (b,cursor_type), Qt))
1315         new_cursor = frame_desired_cursor;
1316       else if (NILP (BVAR (b, cursor_type))) /* nil means no cursor */
1317         new_cursor = Fcons (Qbar, make_number (0));
1318       else
1319         new_cursor = BVAR (b, cursor_type);
1320     }
1321
1322   IT_set_cursor_type (f, new_cursor);
1323
1324   IT_cmgoto (f);  /* position cursor when update is done */
1325 }
1326
1327 /* Copy LEN glyphs displayed on a single line whose vertical position
1328    is YPOS, beginning at horizontal position XFROM to horizontal
1329    position XTO, by moving blocks in the video memory.  Used by
1330    functions that insert and delete glyphs.  */
1331 static void
1332 IT_copy_glyphs (int xfrom, int xto, size_t len, int ypos)
1333 {
1334   /* The offsets of source and destination relative to the
1335      conventional memory selector.  */
1336   int from = 2 * (xfrom + screen_size_X * ypos) + ScreenPrimary;
1337   int to = 2 * (xto + screen_size_X * ypos) + ScreenPrimary;
1338
1339   if (from == to || len <= 0)
1340     return;
1341
1342   _farsetsel (_dos_ds);
1343
1344   /* The source and destination might overlap, so we need to move
1345      glyphs non-destructively.  */
1346   if (from > to)
1347     {
1348       for ( ; len; from += 2, to += 2, len--)
1349         _farnspokew (to, _farnspeekw (from));
1350     }
1351   else
1352     {
1353       from += (len - 1) * 2;
1354       to += (len - 1) * 2;
1355       for ( ; len; from -= 2, to -= 2, len--)
1356         _farnspokew (to, _farnspeekw (from));
1357     }
1358   if (screen_virtual_segment)
1359     dosv_refresh_virtual_screen (ypos * screen_size_X * 2, screen_size_X);
1360 }
1361
1362 /* Insert and delete glyphs.  */
1363 static void
1364 IT_insert_glyphs (struct frame *f, struct glyph *start, int len)
1365 {
1366   int shift_by_width = screen_size_X - (new_pos_X + len);
1367
1368   /* Shift right the glyphs from the nominal cursor position to the
1369      end of this line.  */
1370   IT_copy_glyphs (new_pos_X, new_pos_X + len, shift_by_width, new_pos_Y);
1371
1372   /* Now write the glyphs to be inserted.  */
1373   IT_write_glyphs (f, start, len);
1374 }
1375
1376 static void
1377 IT_delete_glyphs (struct frame *f, int n)
1378 {
1379   emacs_abort ();
1380 }
1381
1382 /* This was copied from xfaces.c  */
1383
1384 extern Lisp_Object Qbackground_color;
1385 extern Lisp_Object Qforeground_color;
1386 Lisp_Object Qreverse;
1387 extern Lisp_Object Qtitle;
1388
1389 /* IT_set_terminal_modes is called when emacs is started,
1390    resumed, and whenever the screen is redrawn!  */
1391
1392 static void
1393 IT_set_terminal_modes (struct terminal *term)
1394 {
1395   struct tty_display_info *tty;
1396
1397   /* If called with initial terminal, it's too early to do anything
1398      useful.  */
1399   if (term->type == output_initial)
1400     return;
1401
1402   tty = term->display_info.tty;
1403
1404   if (tty->termscript)
1405     fprintf (tty->termscript, "\n<SET_TERM>");
1406
1407   screen_size_X = ScreenCols ();
1408   screen_size_Y = ScreenRows ();
1409   screen_size = screen_size_X * screen_size_Y;
1410
1411   new_pos_X = new_pos_Y = 0;
1412   current_pos_X = current_pos_Y = -1;
1413
1414   if (term_setup_done)
1415     return;
1416   term_setup_done = 1;
1417
1418   startup_screen_size_X = screen_size_X;
1419   startup_screen_size_Y = screen_size_Y;
1420   startup_screen_attrib = ScreenAttrib;
1421
1422   /* Is DOS/V (or any other RSIS software which relocates
1423      the screen) installed?  */
1424   {
1425     unsigned short es_value;
1426     __dpmi_regs regs;
1427
1428     regs.h.ah = 0xfe;   /* get relocated screen address */
1429     if (ScreenPrimary == 0xb0000UL || ScreenPrimary == 0xb8000UL)
1430       regs.x.es = (ScreenPrimary >> 4) & 0xffff;
1431     else if (screen_old_address) /* already switched to Japanese mode once */
1432       regs.x.es = (screen_old_address >> 4) & 0xffff;
1433     else
1434       regs.x.es = ScreenMode () == 7 ? 0xb000 : 0xb800;
1435     regs.x.di = 0;
1436     es_value = regs.x.es;
1437     __dpmi_int (0x10, &regs);
1438
1439     if (regs.x.es != es_value)
1440       {
1441         /* screen_old_address is only set if ScreenPrimary does NOT
1442            already point to the relocated buffer address returned by
1443            the Int 10h/AX=FEh call above.  DJGPP v2.02 and later sets
1444            ScreenPrimary to that address at startup under DOS/V.  */
1445         if (regs.x.es != ((ScreenPrimary >> 4) & 0xffff))
1446           screen_old_address = ScreenPrimary;
1447         screen_virtual_segment = regs.x.es;
1448         screen_virtual_offset  = regs.x.di;
1449         ScreenPrimary = (screen_virtual_segment << 4) + screen_virtual_offset;
1450       }
1451   }
1452
1453   ScreenGetCursor (&startup_pos_Y, &startup_pos_X);
1454   ScreenRetrieve (startup_screen_buffer = xmalloc (screen_size * 2));
1455
1456   bright_bg ();
1457 }
1458
1459 /* IT_reset_terminal_modes is called when emacs is
1460    suspended or killed.  */
1461
1462 static void
1463 IT_reset_terminal_modes (struct terminal *term)
1464 {
1465   int display_row_start = (int) ScreenPrimary;
1466   int saved_row_len     = startup_screen_size_X * 2;
1467   int update_row_len    = ScreenCols () * 2, current_rows = ScreenRows ();
1468   int to_next_row       = update_row_len;
1469   unsigned char *saved_row = startup_screen_buffer;
1470   int cursor_pos_X = ScreenCols () - 1, cursor_pos_Y = ScreenRows () - 1;
1471   struct tty_display_info *tty = term->display_info.tty;
1472
1473   if (tty->termscript)
1474     fprintf (tty->termscript, "\n<RESET_TERM>");
1475
1476   if (!term_setup_done)
1477     return;
1478
1479   mouse_off ();
1480
1481   /* Leave the video system in the same state as we found it,
1482      as far as the blink/bright-background bit is concerned.  */
1483   maybe_enable_blinking ();
1484
1485   /* We have a situation here.
1486      We cannot just do ScreenUpdate(startup_screen_buffer) because
1487      the luser could have changed screen dimensions inside Emacs
1488      and failed (or didn't want) to restore them before killing
1489      Emacs.  ScreenUpdate() uses the *current* screen dimensions and
1490      thus will happily use memory outside what was allocated for
1491      `startup_screen_buffer'.
1492      Thus we only restore as much as the current screen dimensions
1493      can hold, and clear the rest (if the saved screen is smaller than
1494      the current) with the color attribute saved at startup.  The cursor
1495      is also restored within the visible dimensions.  */
1496
1497   ScreenAttrib = startup_screen_attrib;
1498
1499   /* Don't restore the screen if we are exiting less than 2 seconds
1500      after startup: we might be crashing, and the screen might show
1501      some vital clues to what's wrong.  */
1502   if (clock () - startup_time >= 2*CLOCKS_PER_SEC)
1503     {
1504       ScreenClear ();
1505       if (screen_virtual_segment)
1506         dosv_refresh_virtual_screen (0, screen_size);
1507
1508       if (update_row_len > saved_row_len)
1509         update_row_len = saved_row_len;
1510       if (current_rows > startup_screen_size_Y)
1511         current_rows = startup_screen_size_Y;
1512
1513       if (tty->termscript)
1514         fprintf (tty->termscript, "<SCREEN RESTORED (dimensions=%dx%d)>\n",
1515                  update_row_len / 2, current_rows);
1516
1517       while (current_rows--)
1518         {
1519           dosmemput (saved_row, update_row_len, display_row_start);
1520           if (screen_virtual_segment)
1521             dosv_refresh_virtual_screen (display_row_start - ScreenPrimary,
1522                                          update_row_len / 2);
1523           saved_row         += saved_row_len;
1524           display_row_start += to_next_row;
1525         }
1526     }
1527   if (startup_pos_X < cursor_pos_X)
1528     cursor_pos_X = startup_pos_X;
1529   if (startup_pos_Y < cursor_pos_Y)
1530     cursor_pos_Y = startup_pos_Y;
1531
1532   ScreenSetCursor (cursor_pos_Y, cursor_pos_X);
1533   xfree (startup_screen_buffer);
1534   startup_screen_buffer = NULL;
1535
1536   term_setup_done = 0;
1537 }
1538
1539 /* Remember the screen colors of the current frame, to serve as the
1540    default colors for newly-created frames.  */
1541 DEFUN ("msdos-remember-default-colors", Fmsdos_remember_default_colors,
1542        Smsdos_remember_default_colors, 1, 1, 0,
1543        doc: /* Remember the screen colors of the current frame.  */)
1544   (Lisp_Object frame)
1545 {
1546   struct frame *f;
1547
1548   CHECK_FRAME (frame);
1549   f = XFRAME (frame);
1550
1551   /* This function is called after applying default-frame-alist to the
1552      initial frame.  At that time, if reverse-colors option was
1553      specified in default-frame-alist, it was already applied, and
1554      frame colors are reversed.  */
1555   initial_screen_colors[0] = FRAME_FOREGROUND_PIXEL (f);
1556   initial_screen_colors[1] = FRAME_BACKGROUND_PIXEL (f);
1557
1558   return Qnil;
1559 }
1560
1561 void
1562 IT_set_frame_parameters (struct frame *f, Lisp_Object alist)
1563 {
1564   Lisp_Object tail;
1565   int i, j, length = XINT (Flength (alist));
1566   Lisp_Object *parms
1567     = (Lisp_Object *) alloca (length * word_size);
1568   Lisp_Object *values
1569     = (Lisp_Object *) alloca (length * word_size);
1570   /* Do we have to reverse the foreground and background colors?  */
1571   int reverse = EQ (Fcdr (Fassq (Qreverse, f->param_alist)), Qt);
1572   int redraw = 0, fg_set = 0, bg_set = 0;
1573   unsigned long orig_fg, orig_bg;
1574   struct tty_display_info *tty = FRAME_TTY (f);
1575
1576   /* If we are creating a new frame, begin with the original screen colors
1577      used for the initial frame.  */
1578   if (!f->default_face_done_p
1579       && initial_screen_colors[0] != -1 && initial_screen_colors[1] != -1)
1580     {
1581       FRAME_FOREGROUND_PIXEL (f) = initial_screen_colors[0];
1582       FRAME_BACKGROUND_PIXEL (f) = initial_screen_colors[1];
1583       init_frame_faces (f);
1584       f->default_face_done_p = 1;
1585     }
1586   orig_fg = reverse ? FRAME_BACKGROUND_PIXEL (f) : FRAME_FOREGROUND_PIXEL (f);
1587   orig_bg = reverse ? FRAME_FOREGROUND_PIXEL (f) : FRAME_BACKGROUND_PIXEL (f);
1588
1589   /* Extract parm names and values into those vectors.  */
1590   i = 0;
1591   for (tail = alist; CONSP (tail); tail = XCDR (tail))
1592     {
1593       Lisp_Object elt = XCAR (tail);
1594       parms[i] = Fcar (elt);
1595       CHECK_SYMBOL (parms[i]);
1596       values[i] = Fcdr (elt);
1597       i++;
1598     }
1599
1600   j = i;
1601
1602   for (i = 0; i < j; i++)
1603     {
1604       Lisp_Object prop, val;
1605
1606       prop = parms[i];
1607       val  = values[i];
1608
1609       if (EQ (prop, Qreverse))
1610         reverse = EQ (val, Qt);
1611     }
1612
1613   if (tty->termscript && reverse)
1614     fprintf (tty->termscript, "<INVERSE-VIDEO>\n");
1615
1616   /* Now process the alist elements in reverse of specified order.  */
1617   for (i--; i >= 0; i--)
1618     {
1619       Lisp_Object prop, val;
1620
1621       prop = parms[i];
1622       val  = values[i];
1623
1624       if (EQ (prop, Qforeground_color))
1625         {
1626           unsigned long new_color = load_color (f, NULL, val, reverse
1627                                                 ? LFACE_BACKGROUND_INDEX
1628                                                 : LFACE_FOREGROUND_INDEX);
1629           if (new_color !=  FACE_TTY_DEFAULT_COLOR
1630               && new_color != FACE_TTY_DEFAULT_FG_COLOR
1631               && new_color != FACE_TTY_DEFAULT_BG_COLOR)
1632             {
1633               if (!reverse)
1634                 {
1635                   FRAME_FOREGROUND_PIXEL (f) = new_color;
1636                   /* Make sure the foreground of the default face for
1637                      this frame is changed as well.  */
1638                   update_face_from_frame_parameter (f, Qforeground_color, val);
1639                   fg_set = 1;
1640                   if (tty->termscript)
1641                     fprintf (tty->termscript, "<FGCOLOR %lu>\n", new_color);
1642                 }
1643               else
1644                 {
1645                   FRAME_BACKGROUND_PIXEL (f) = new_color;
1646                   update_face_from_frame_parameter (f, Qbackground_color, val);
1647                   bg_set = 1;
1648                   if (tty->termscript)
1649                     fprintf (tty->termscript, "<BGCOLOR %lu>\n", new_color);
1650                 }
1651               redraw = 1;
1652             }
1653         }
1654       else if (EQ (prop, Qbackground_color))
1655         {
1656           unsigned long new_color = load_color (f, NULL, val, reverse
1657                                                 ? LFACE_FOREGROUND_INDEX
1658                                                 : LFACE_BACKGROUND_INDEX);
1659           if (new_color != FACE_TTY_DEFAULT_COLOR
1660               && new_color != FACE_TTY_DEFAULT_FG_COLOR
1661               && new_color != FACE_TTY_DEFAULT_BG_COLOR)
1662             {
1663               if (!reverse)
1664                 {
1665                   FRAME_BACKGROUND_PIXEL (f) = new_color;
1666                   /* Make sure the background of the default face for
1667                      this frame is changed as well.  */
1668                   bg_set = 1;
1669                   update_face_from_frame_parameter (f, Qbackground_color, val);
1670                   if (tty->termscript)
1671                     fprintf (tty->termscript, "<BGCOLOR %lu>\n", new_color);
1672                 }
1673               else
1674                 {
1675                   FRAME_FOREGROUND_PIXEL (f) = new_color;
1676                   fg_set = 1;
1677                   update_face_from_frame_parameter (f, Qforeground_color, val);
1678                   if (tty->termscript)
1679                     fprintf (tty->termscript, "<FGCOLOR %lu>\n", new_color);
1680                 }
1681               redraw = 1;
1682             }
1683         }
1684       else if (EQ (prop, Qtitle))
1685         {
1686           x_set_title (f, val);
1687           if (tty->termscript)
1688             fprintf (tty->termscript, "<TITLE: %s>\n", SDATA (val));
1689         }
1690       else if (EQ (prop, Qcursor_type))
1691         {
1692           IT_set_cursor_type (f, val);
1693           if (tty->termscript)
1694             fprintf (tty->termscript, "<CTYPE: %s>\n",
1695                      EQ (val, Qbar)
1696                      || EQ (val, Qhbar)
1697                      || (CONSP (val) && (EQ (XCAR (val), Qbar)
1698                                          || EQ (XCAR (val), Qhbar)))
1699                      ? "bar" : "box");
1700         }
1701       else if (EQ (prop, Qtty_type))
1702         {
1703           internal_terminal_init ();
1704           if (tty->termscript)
1705             fprintf (tty->termscript, "<TERM_INIT done, TTY_TYPE: %.*s>\n",
1706                      SBYTES (val), SDATA (val));
1707         }
1708       store_frame_param (f, prop, val);
1709     }
1710
1711   /* If they specified "reverse", but not the colors, we need to swap
1712      the current frame colors.  */
1713   if (reverse)
1714     {
1715       if (!fg_set)
1716         {
1717           FRAME_FOREGROUND_PIXEL (f) = orig_bg;
1718           update_face_from_frame_parameter (f, Qforeground_color,
1719                                             tty_color_name (f, orig_bg));
1720           redraw = 1;
1721         }
1722       if (!bg_set)
1723         {
1724           FRAME_BACKGROUND_PIXEL (f) = orig_fg;
1725           update_face_from_frame_parameter (f, Qbackground_color,
1726                                             tty_color_name (f, orig_fg));
1727           redraw = 1;
1728         }
1729     }
1730
1731   if (redraw)
1732     {
1733       face_change_count++;      /* forces xdisp.c to recompute basic faces */
1734       if (f == SELECTED_FRAME ())
1735         redraw_frame (f);
1736     }
1737 }
1738
1739 extern void init_frame_faces (struct frame *);
1740
1741 #endif /* !HAVE_X_WINDOWS */
1742
1743
1744 /* Do we need the internal terminal?  */
1745
1746 void
1747 internal_terminal_init (void)
1748 {
1749   static int init_needed = 1;
1750   char *term = getenv ("TERM"), *colors;
1751   struct frame *sf = SELECTED_FRAME ();
1752   struct tty_display_info *tty;
1753
1754 #ifdef HAVE_X_WINDOWS
1755   if (!inhibit_window_system)
1756     return;
1757 #endif
1758
1759   /* If this is the initial terminal, we are done here.  */
1760   if (sf->output_method == output_initial)
1761     return;
1762
1763   internal_terminal
1764     = (!noninteractive) && term && !strcmp (term, "internal");
1765
1766 #ifndef HAVE_X_WINDOWS
1767   if (!internal_terminal || inhibit_window_system)
1768     {
1769       sf->output_method = output_termcap;
1770       return;
1771     }
1772
1773   tty = FRAME_TTY (sf);
1774   kset_window_system (current_kboard, Qpc);
1775   sf->output_method = output_msdos_raw;
1776   if (init_needed)
1777     {
1778       if (!tty->termscript && getenv ("EMACSTEST"))
1779         tty->termscript = fopen (getenv ("EMACSTEST"), "wt");
1780       if (tty->termscript)
1781         {
1782           time_t now = time (NULL);
1783           struct tm *tnow = localtime (&now);
1784           char tbuf[100];
1785
1786           strftime (tbuf, sizeof (tbuf) - 1, "%a %b %e %Y %H:%M:%S %Z", tnow);
1787           fprintf (tty->termscript, "\nEmacs session started at %s\n", tbuf);
1788           fprintf (tty->termscript,   "=====================\n\n");
1789         }
1790
1791       Vinitial_window_system = Qpc;
1792       Vwindow_system_version = make_number (24); /* RE Emacs version */
1793       tty->terminal->type = output_msdos_raw;
1794
1795       /* If Emacs was dumped on DOS/V machine, forget the stale VRAM
1796          address.  */
1797       screen_old_address = 0;
1798
1799       /* Forget the stale screen colors as well.  */
1800       initial_screen_colors[0] = initial_screen_colors[1] = -1;
1801
1802       FRAME_BACKGROUND_PIXEL (SELECTED_FRAME ()) = 7; /* White */
1803       FRAME_FOREGROUND_PIXEL (SELECTED_FRAME ()) = 0; /* Black */
1804       bright_bg ();
1805       colors = getenv ("EMACSCOLORS");
1806       if (colors && strlen (colors) >= 2)
1807         {
1808           /* The colors use 4 bits each (we enable bright background).  */
1809           if (isdigit (colors[0]))
1810             colors[0] -= '0';
1811           else if (isxdigit (colors[0]))
1812             colors[0] -= (isupper (colors[0]) ? 'A' : 'a') - 10;
1813           if (colors[0] >= 0 && colors[0] < 16)
1814             FRAME_FOREGROUND_PIXEL (SELECTED_FRAME ()) = colors[0];
1815           if (isdigit (colors[1]))
1816             colors[1] -= '0';
1817           else if (isxdigit (colors[1]))
1818             colors[1] -= (isupper (colors[1]) ? 'A' : 'a') - 10;
1819           if (colors[1] >= 0 && colors[1] < 16)
1820             FRAME_BACKGROUND_PIXEL (SELECTED_FRAME ()) = colors[1];
1821         }
1822
1823       reset_mouse_highlight (&the_only_display_info.mouse_highlight);
1824
1825       if (have_mouse)   /* detected in dos_ttraw, which see */
1826         {
1827           have_mouse = 1;       /* enable mouse */
1828           mouse_visible = 0;
1829           mouse_setup_buttons (mouse_button_count);
1830           tty->terminal->mouse_position_hook = &mouse_get_pos;
1831           mouse_init ();
1832         }
1833
1834       if (tty->termscript && screen_size)
1835         fprintf (tty->termscript, "<SCREEN SAVED (dimensions=%dx%d)>\n",
1836                  screen_size_X, screen_size_Y);
1837
1838       init_frame_faces (sf);
1839       init_needed = 0;
1840     }
1841 #endif
1842 }
1843
1844 void
1845 initialize_msdos_display (struct terminal *term)
1846 {
1847   term->rif = 0;                /* we don't support window-based display */
1848   term->cursor_to_hook = term->raw_cursor_to_hook = IT_cursor_to;
1849   term->clear_to_end_hook = IT_clear_to_end;
1850   term->clear_frame_hook = IT_clear_screen;
1851   term->clear_end_of_line_hook = IT_clear_end_of_line;
1852   term->ins_del_lines_hook = 0;
1853   term->insert_glyphs_hook = IT_insert_glyphs;
1854   term->write_glyphs_hook = IT_write_glyphs;
1855   term->delete_glyphs_hook = IT_delete_glyphs;
1856   term->ring_bell_hook = IT_ring_bell;
1857   term->reset_terminal_modes_hook = IT_reset_terminal_modes;
1858   term->set_terminal_modes_hook = IT_set_terminal_modes;
1859   term->set_terminal_window_hook = NULL;
1860   term->update_begin_hook = IT_update_begin;
1861   term->update_end_hook = IT_update_end;
1862   term->frame_up_to_date_hook = IT_frame_up_to_date;
1863   term->mouse_position_hook = 0; /* set later by dos_ttraw */
1864   term->frame_rehighlight_hook = 0;
1865   term->frame_raise_lower_hook = 0;
1866   term->set_vertical_scroll_bar_hook = 0;
1867   term->condemn_scroll_bars_hook = 0;
1868   term->redeem_scroll_bar_hook = 0;
1869   term->judge_scroll_bars_hook = 0;
1870   term->read_socket_hook = &tty_read_avail_input; /* from keyboard.c */
1871 }
1872
1873 int
1874 dos_get_saved_screen (char **screen, int *rows, int *cols)
1875 {
1876 #ifndef HAVE_X_WINDOWS
1877   *screen = startup_screen_buffer;
1878   *cols = startup_screen_size_X;
1879   *rows = startup_screen_size_Y;
1880   return *screen != (char *)0;
1881 #else
1882   return 0;
1883 #endif
1884 }
1885
1886 #ifndef HAVE_X_WINDOWS
1887
1888 /* We are not X, but we can emulate it well enough for our needs... */
1889 void
1890 check_window_system (void)
1891 {
1892   if (! FRAME_MSDOS_P (SELECTED_FRAME ()))
1893     error ("Not running under a window system");
1894 }
1895
1896 #endif
1897
1898 \f
1899 /* ----------------------- Keyboard control ----------------------
1900  *
1901  * Keymaps reflect the following keyboard layout:
1902  *
1903  *    0  1  2  3  4  5  6  7  8  9  10 11 12  BS
1904  *    TAB 15 16 17 18 19 20 21 22 23 24 25 26 (41)
1905  *    CLOK 30 31 32 33 34 35 36 37 38 39 40 (41) RET
1906  *    SH () 45 46 47 48 49 50 51 52 53 54  SHIFT
1907  *                    SPACE
1908  */
1909
1910 #define Ignore  0x0000
1911 #define Normal  0x0000  /* normal key - alt changes scan-code */
1912 #define FctKey  0x1000  /* func key if c == 0, else c */
1913 #define Special 0x2000  /* func key even if c != 0 */
1914 #define ModFct  0x3000  /* special if mod-keys, else 'c' */
1915 #define Map     0x4000  /* alt scan-code, map to unshift/shift key */
1916 #define KeyPad  0x5000  /* map to insert/kp-0 depending on c == 0xe0 */
1917 #define Grey    0x6000  /* Grey keypad key */
1918
1919 #define Alt     0x0100  /* alt scan-code */
1920 #define Ctrl    0x0200  /* ctrl scan-code */
1921 #define Shift   0x0400  /* shift scan-code */
1922
1923 static int extended_kbd; /* 101 (102) keyboard present. */
1924
1925 struct kbd_translate {
1926   unsigned char  sc;
1927   unsigned char  ch;
1928   unsigned short code;
1929 };
1930
1931 struct dos_keyboard_map
1932 {
1933   char *unshifted;
1934   char *shifted;
1935   char *alt_gr;
1936   struct kbd_translate *translate_table;
1937 };
1938
1939
1940 static struct dos_keyboard_map us_keyboard = {
1941 /* 0         1         2         3         4         5      */
1942 /* 01234567890123456789012345678901234567890 123 45678901234 */
1943   "`1234567890-=  qwertyuiop[]   asdfghjkl;'\\  \\zxcvbnm,./  ",
1944 /* 0123456789012345678901234567890123456789 012345678901234 */
1945   "~!@#$%^&*()_+  QWERTYUIOP{}   ASDFGHJKL:\"|  |ZXCVBNM<>?  ",
1946   0,                            /* no Alt-Gr key */
1947   0                             /* no translate table */
1948 };
1949
1950 static struct dos_keyboard_map fr_keyboard = {
1951 /* 0         1         2         3         4         5      */
1952 /* 012 3456789012345678901234567890123456789012345678901234 */
1953   "ý&‚\"'(-Š_€…)=  azertyuiop^$   qsdfghjklm—*  <wxcvbn,;:!  ",
1954 /* 0123456789012345678901234567890123456789012345678901234 */
1955   " 1234567890ø+  AZERTYUIOPùœ   QSDFGHJKLM%æ  >WXCVBN?./õ  ",
1956 /* 01234567 89012345678901234567890123456789012345678901234 */
1957   "  ~#{[|`\\^@]}             Ï                              ",
1958   0                             /* no translate table */
1959 };
1960
1961 /*
1962  * Italian keyboard support, country code 39.
1963  * '<' 56:3c*0000
1964  * '>' 56:3e*0000
1965  * added also {,},` as, respectively, AltGr-8, AltGr-9, AltGr-'
1966  * Donated by Stefano Brozzi <brozzis@mag00.cedi.unipr.it>
1967  */
1968
1969 static struct kbd_translate it_kbd_translate_table[] = {
1970   { 0x56, 0x3c, Normal | 13 },
1971   { 0x56, 0x3e, Normal | 27 },
1972   { 0, 0, 0 }
1973 };
1974 static struct dos_keyboard_map it_keyboard = {
1975 /* 0          1         2         3         4         5     */
1976 /* 0 123456789012345678901234567890123456789012345678901234 */
1977   "\\1234567890'�< qwertyuiopŠ+>  asdfghjkl•…—  <zxcvbnm,.-  ",
1978 /* 01 23456789012345678901234567890123456789012345678901234 */
1979   "|!\"œ$%&/()=?^> QWERTYUIOP‚*   ASDFGHJKL‡øõ  >ZXCVBNM;:_  ",
1980 /* 0123456789012345678901234567890123456789012345678901234 */
1981   "        {}~`             []             @#               ",
1982   it_kbd_translate_table
1983 };
1984
1985 static struct dos_keyboard_map dk_keyboard = {
1986 /* 0         1         2         3         4         5      */
1987 /* 0123456789012345678901234567890123456789012345678901234 */
1988   "«1234567890+|  qwertyuiop†~   asdfghjkl‘›'  <zxcvbnm,.-  ",
1989 /* 01 23456789012345678901234567890123456789012345678901234 */
1990   "õ!\"#$%&/()=?`  QWERTYUIOP�^   ASDFGHJKL’�*  >ZXCVBNM;:_  ",
1991 /* 0123456789012345678901234567890123456789012345678901234 */
1992   "  @œ$  {[]} |                                             ",
1993   0                             /* no translate table */
1994 };
1995
1996 static struct kbd_translate jp_kbd_translate_table[] = {
1997   { 0x73, 0x5c, Normal | 0 },
1998   { 0x73, 0x5f, Normal | 0 },
1999   { 0x73, 0x1c, Map | 0 },
2000   { 0x7d, 0x5c, Normal | 13 },
2001   { 0x7d, 0x7c, Normal | 13 },
2002   { 0x7d, 0x1c, Map | 13 },
2003   { 0, 0, 0 }
2004 };
2005 static struct dos_keyboard_map jp_keyboard = {
2006 /*  0         1          2         3         4         5     */
2007 /*  0123456789012 345678901234567890123456789012345678901234 */
2008   "\\1234567890-^\\ qwertyuiop@[   asdfghjkl;:]   zxcvbnm,./  ",
2009 /*  01 23456789012345678901234567890123456789012345678901234 */
2010    "_!\"#$%&'()~=~| QWERTYUIOP`{   ASDFGHJKL+*}   ZXCVBNM<>?  ",
2011   0,                            /* no Alt-Gr key */
2012   jp_kbd_translate_table
2013 };
2014
2015 static struct keyboard_layout_list
2016 {
2017   int country_code;
2018   struct dos_keyboard_map *keyboard_map;
2019 } keyboard_layout_list[] =
2020 {
2021   { 1, &us_keyboard },
2022   { 33, &fr_keyboard },
2023   { 39, &it_keyboard },
2024   { 45, &dk_keyboard },
2025   { 81, &jp_keyboard }
2026 };
2027
2028 static struct dos_keyboard_map *keyboard;
2029 static int keyboard_map_all;
2030 static int international_keyboard;
2031
2032 int
2033 dos_set_keyboard (int code, int always)
2034 {
2035   int i;
2036   _go32_dpmi_registers regs;
2037
2038   /* See if Keyb.Com is installed (for international keyboard support).
2039      Note: calling Int 2Fh via int86 wedges the DOS box on some versions
2040      of Windows 9X!  So don't do that!  */
2041   regs.x.ax = 0xad80;
2042   regs.x.ss = regs.x.sp = regs.x.flags = 0;
2043   _go32_dpmi_simulate_int (0x2f, &regs);
2044   if (regs.h.al == 0xff)
2045     international_keyboard = 1;
2046
2047   /* Initialize to US settings, for countries that don't have their own.  */
2048   keyboard = keyboard_layout_list[0].keyboard_map;
2049   keyboard_map_all = always;
2050   dos_keyboard_layout = 1;
2051
2052   for (i = 0; i < (sizeof (keyboard_layout_list)/sizeof (struct keyboard_layout_list)); i++)
2053     if (code == keyboard_layout_list[i].country_code)
2054       {
2055         keyboard = keyboard_layout_list[i].keyboard_map;
2056         keyboard_map_all = always;
2057         dos_keyboard_layout = code;
2058         return 1;
2059       }
2060   return 0;
2061 }
2062 \f
2063 static struct
2064 {
2065   unsigned char char_code;      /* normal code  */
2066   unsigned char meta_code;      /* M- code      */
2067   unsigned char keypad_code;    /* keypad code  */
2068   unsigned char editkey_code;   /* edit key     */
2069 } keypad_translate_map[] = {
2070   { '0',  '0',  0xb0, /* kp-0 */                0x63 /* insert */ },
2071   { '1',  '1',  0xb1, /* kp-1 */                0x57 /* end */    },
2072   { '2',  '2',  0xb2, /* kp-2 */                0x54 /* down */   },
2073   { '3',  '3',  0xb3, /* kp-3 */                0x56 /* next */   },
2074   { '4',  '4',  0xb4, /* kp-4 */                0x51 /* left */   },
2075   { '5',  '5',  0xb5, /* kp-5 */                0xb5 /* kp-5 */   },
2076   { '6',  '6',  0xb6, /* kp-6 */                0x53 /* right */  },
2077   { '7',  '7',  0xb7, /* kp-7 */                0x50 /* home */   },
2078   { '8',  '8',  0xb8, /* kp-8 */                0x52 /* up */     },
2079   { '9',  '9',  0xb9, /* kp-9 */                0x55 /* prior */  },
2080   { '.',  '-',  0xae, /* kp-decimal */          0xff  /* delete */}
2081 };
2082
2083 static struct
2084 {
2085   unsigned char char_code;      /* normal code  */
2086   unsigned char keypad_code;    /* keypad code  */
2087 } grey_key_translate_map[] = {
2088   { '/',  0xaf /* kp-decimal */  },
2089   { '*',  0xaa /* kp-multiply */ },
2090   { '-',  0xad /* kp-subtract */ },
2091   { '+',  0xab /* kp-add */      },
2092   { '\r', 0x8d  /* kp-enter */   }
2093 };
2094
2095 static unsigned short
2096 ibmpc_translate_map[] =
2097 {
2098   /* --------------- 00 to 0f --------------- */
2099   Normal | 0xff,        /* Ctrl Break + Alt-NNN */
2100   Alt | ModFct | 0x1b,          /* Escape */
2101   Normal | 1,                   /* '1' */
2102   Normal | 2,                   /* '2' */
2103   Normal | 3,                   /* '3' */
2104   Normal | 4,                   /* '4' */
2105   Normal | 5,                   /* '5' */
2106   Normal | 6,                   /* '6' */
2107   Normal | 7,                   /* '7' */
2108   Normal | 8,                   /* '8' */
2109   Normal | 9,                   /* '9' */
2110   Normal | 10,                  /* '0' */
2111   Normal | 11,                  /* '-' */
2112   Normal | 12,                  /* '=' */
2113   Special | 0x08,               /* Backspace */
2114   ModFct | 0x74,                /* Tab/Backtab */
2115
2116   /* --------------- 10 to 1f --------------- */
2117   Map | 15,                     /* 'q' */
2118   Map | 16,                     /* 'w' */
2119   Map | 17,                     /* 'e' */
2120   Map | 18,                     /* 'r' */
2121   Map | 19,                     /* 't' */
2122   Map | 20,                     /* 'y' */
2123   Map | 21,                     /* 'u' */
2124   Map | 22,                     /* 'i' */
2125   Map | 23,                     /* 'o' */
2126   Map | 24,                     /* 'p' */
2127   Map | 25,                     /* '[' */
2128   Map | 26,                     /* ']' */
2129   ModFct | 0x0d,                /* Return */
2130   Ignore,                       /* Ctrl */
2131   Map | 30,                     /* 'a' */
2132   Map | 31,                     /* 's' */
2133
2134   /* --------------- 20 to 2f --------------- */
2135   Map | 32,                     /* 'd' */
2136   Map | 33,                     /* 'f' */
2137   Map | 34,                     /* 'g' */
2138   Map | 35,                     /* 'h' */
2139   Map | 36,                     /* 'j' */
2140   Map | 37,                     /* 'k' */
2141   Map | 38,                     /* 'l' */
2142   Map | 39,                     /* ';' */
2143   Map | 40,                     /* '\'' */
2144   Map |  0,                     /* '`' */
2145   Ignore,                       /* Left shift */
2146   Map | 41,                     /* '\\' */
2147   Map | 45,                     /* 'z' */
2148   Map | 46,                     /* 'x' */
2149   Map | 47,                     /* 'c' */
2150   Map | 48,                     /* 'v' */
2151
2152   /* --------------- 30 to 3f --------------- */
2153   Map | 49,                     /* 'b' */
2154   Map | 50,                     /* 'n' */
2155   Map | 51,                     /* 'm' */
2156   Map | 52,                     /* ',' */
2157   Map | 53,                     /* '.' */
2158   Map | 54,                     /* '/' */
2159   Ignore,                       /* Right shift */
2160   Grey | 1,                     /* Grey * */
2161   Ignore,                       /* Alt */
2162   Normal | 55,                  /* ' ' */
2163   Ignore,                       /* Caps Lock */
2164   FctKey | 0xbe,                /* F1 */
2165   FctKey | 0xbf,                /* F2 */
2166   FctKey | 0xc0,                /* F3 */
2167   FctKey | 0xc1,                /* F4 */
2168   FctKey | 0xc2,                /* F5 */
2169
2170   /* --------------- 40 to 4f --------------- */
2171   FctKey | 0xc3,                /* F6 */
2172   FctKey | 0xc4,                /* F7 */
2173   FctKey | 0xc5,                /* F8 */
2174   FctKey | 0xc6,                /* F9 */
2175   FctKey | 0xc7,                /* F10 */
2176   Ignore,                       /* Num Lock */
2177   Ignore,                       /* Scroll Lock */
2178   KeyPad | 7,                   /* Home */
2179   KeyPad | 8,                   /* Up */
2180   KeyPad | 9,                   /* Page Up */
2181   Grey | 2,                     /* Grey - */
2182   KeyPad | 4,                   /* Left */
2183   KeyPad | 5,                   /* Keypad 5 */
2184   KeyPad | 6,                   /* Right */
2185   Grey | 3,                     /* Grey + */
2186   KeyPad | 1,                   /* End */
2187
2188   /* --------------- 50 to 5f --------------- */
2189   KeyPad | 2,                   /* Down */
2190   KeyPad | 3,                   /* Page Down */
2191   KeyPad | 0,                   /* Insert */
2192   KeyPad | 10,                  /* Delete */
2193   Shift | FctKey | 0xbe,        /* (Shift) F1 */
2194   Shift | FctKey | 0xbf,        /* (Shift) F2 */
2195   Shift | FctKey | 0xc0,        /* (Shift) F3 */
2196   Shift | FctKey | 0xc1,        /* (Shift) F4 */
2197   Shift | FctKey | 0xc2,        /* (Shift) F5 */
2198   Shift | FctKey | 0xc3,        /* (Shift) F6 */
2199   Shift | FctKey | 0xc4,        /* (Shift) F7 */
2200   Shift | FctKey | 0xc5,        /* (Shift) F8 */
2201   Shift | FctKey | 0xc6,        /* (Shift) F9 */
2202   Shift | FctKey | 0xc7,        /* (Shift) F10 */
2203   Ctrl | FctKey | 0xbe,         /* (Ctrl) F1 */
2204   Ctrl | FctKey | 0xbf,         /* (Ctrl) F2 */
2205
2206   /* --------------- 60 to 6f --------------- */
2207   Ctrl | FctKey | 0xc0,         /* (Ctrl) F3 */
2208   Ctrl | FctKey | 0xc1,         /* (Ctrl) F4 */
2209   Ctrl | FctKey | 0xc2,         /* (Ctrl) F5 */
2210   Ctrl | FctKey | 0xc3,         /* (Ctrl) F6 */
2211   Ctrl | FctKey | 0xc4,         /* (Ctrl) F7 */
2212   Ctrl | FctKey | 0xc5,         /* (Ctrl) F8 */
2213   Ctrl | FctKey | 0xc6,         /* (Ctrl) F9 */
2214   Ctrl | FctKey | 0xc7,         /* (Ctrl) F10 */
2215   Alt | FctKey | 0xbe,          /* (Alt) F1 */
2216   Alt | FctKey | 0xbf,          /* (Alt) F2 */
2217   Alt | FctKey | 0xc0,          /* (Alt) F3 */
2218   Alt | FctKey | 0xc1,          /* (Alt) F4 */
2219   Alt | FctKey | 0xc2,          /* (Alt) F5 */
2220   Alt | FctKey | 0xc3,          /* (Alt) F6 */
2221   Alt | FctKey | 0xc4,          /* (Alt) F7 */
2222   Alt | FctKey | 0xc5,          /* (Alt) F8 */
2223
2224   /* --------------- 70 to 7f --------------- */
2225   Alt | FctKey | 0xc6,          /* (Alt) F9 */
2226   Alt | FctKey | 0xc7,          /* (Alt) F10 */
2227   Ctrl | FctKey | 0x6d,         /* (Ctrl) Sys Rq */
2228   Ctrl | KeyPad | 4,            /* (Ctrl) Left */
2229   Ctrl | KeyPad | 6,            /* (Ctrl) Right */
2230   Ctrl | KeyPad | 1,            /* (Ctrl) End */
2231   Ctrl | KeyPad | 3,            /* (Ctrl) Page Down */
2232   Ctrl | KeyPad | 7,            /* (Ctrl) Home */
2233   Alt | Map | 1,                /* '1' */
2234   Alt | Map | 2,                /* '2' */
2235   Alt | Map | 3,                /* '3' */
2236   Alt | Map | 4,                /* '4' */
2237   Alt | Map | 5,                /* '5' */
2238   Alt | Map | 6,                /* '6' */
2239   Alt | Map | 7,                /* '7' */
2240   Alt | Map | 8,                /* '8' */
2241
2242   /* --------------- 80 to 8f --------------- */
2243   Alt | Map | 9,                /* '9' */
2244   Alt | Map | 10,               /* '0' */
2245   Alt | Map | 11,               /* '-' */
2246   Alt | Map | 12,               /* '=' */
2247   Ctrl | KeyPad | 9,            /* (Ctrl) Page Up */
2248   FctKey | 0xc8,                /* F11 */
2249   FctKey | 0xc9,                /* F12 */
2250   Shift | FctKey | 0xc8,        /* (Shift) F11 */
2251   Shift | FctKey | 0xc9,        /* (Shift) F12 */
2252   Ctrl | FctKey | 0xc8,         /* (Ctrl) F11 */
2253   Ctrl | FctKey | 0xc9,         /* (Ctrl) F12 */
2254   Alt | FctKey | 0xc8,          /* (Alt) F11 */
2255   Alt | FctKey | 0xc9,          /* (Alt) F12 */
2256   Ctrl | KeyPad | 8,            /* (Ctrl) Up */
2257   Ctrl | Grey | 2,              /* (Ctrl) Grey - */
2258   Ctrl | KeyPad | 5,            /* (Ctrl) Keypad 5 */
2259
2260   /* --------------- 90 to 9f --------------- */
2261   Ctrl | Grey | 3,              /* (Ctrl) Grey + */
2262   Ctrl | KeyPad | 2,            /* (Ctrl) Down */
2263   Ctrl | KeyPad | 0,            /* (Ctrl) Insert */
2264   Ctrl | KeyPad | 10,           /* (Ctrl) Delete */
2265   Ctrl | FctKey | 0x09,         /* (Ctrl) Tab */
2266   Ctrl | Grey | 0,              /* (Ctrl) Grey / */
2267   Ctrl | Grey | 1,              /* (Ctrl) Grey * */
2268   Alt | FctKey | 0x50,          /* (Alt) Home */
2269   Alt | FctKey | 0x52,          /* (Alt) Up */
2270   Alt | FctKey | 0x55,          /* (Alt) Page Up */
2271   Ignore,                       /* NO KEY */
2272   Alt | FctKey | 0x51,          /* (Alt) Left */
2273   Ignore,                       /* NO KEY */
2274   Alt | FctKey | 0x53,          /* (Alt) Right */
2275   Ignore,                       /* NO KEY */
2276   Alt | FctKey | 0x57,          /* (Alt) End */
2277
2278   /* --------------- a0 to af --------------- */
2279   Alt | KeyPad | 2,             /* (Alt) Down */
2280   Alt | KeyPad | 3,             /* (Alt) Page Down */
2281   Alt | KeyPad | 0,             /* (Alt) Insert */
2282   Alt | KeyPad | 10,            /* (Alt) Delete */
2283   Alt | Grey | 0,               /* (Alt) Grey / */
2284   Alt | FctKey | 0x09,          /* (Alt) Tab */
2285   Alt | Grey | 4                /* (Alt) Keypad Enter */
2286 };
2287 \f
2288 /* These bit-positions corresponds to values returned by BIOS */
2289 #define SHIFT_P         0x0003  /* two bits! */
2290 #define CTRL_P          0x0004
2291 #define ALT_P           0x0008
2292 #define SCRLOCK_P       0x0010
2293 #define NUMLOCK_P       0x0020
2294 #define CAPSLOCK_P      0x0040
2295 #define ALT_GR_P        0x0800
2296 #define SUPER_P         0x4000  /* pseudo */
2297 #define HYPER_P         0x8000  /* pseudo */
2298
2299 static int
2300 dos_get_modifiers (int *keymask)
2301 {
2302   union REGS regs;
2303   int mask, modifiers = 0;
2304
2305   /* Calculate modifier bits */
2306   regs.h.ah = extended_kbd ? 0x12 : 0x02;
2307   int86 (0x16, &regs, &regs);
2308
2309   if (!extended_kbd)
2310     {
2311       mask = regs.h.al & (SHIFT_P | CTRL_P | ALT_P |
2312                           SCRLOCK_P | NUMLOCK_P | CAPSLOCK_P);
2313     }
2314   else
2315     {
2316       mask = regs.h.al & (SHIFT_P |
2317                           SCRLOCK_P | NUMLOCK_P | CAPSLOCK_P);
2318
2319       /* Do not break international keyboard support.   */
2320       /* When Keyb.Com is loaded, the right Alt key is  */
2321       /* used for accessing characters like { and }       */
2322       if (regs.h.ah & 2)                /* Left ALT pressed ? */
2323         mask |= ALT_P;
2324
2325       if ((regs.h.ah & 8) != 0)         /* Right ALT pressed ? */
2326         {
2327           mask |= ALT_GR_P;
2328           if (dos_hyper_key == 1)
2329             {
2330               mask |= HYPER_P;
2331               modifiers |= hyper_modifier;
2332             }
2333           else if (dos_super_key == 1)
2334             {
2335               mask |= SUPER_P;
2336               modifiers |= super_modifier;
2337             }
2338           else if (!international_keyboard)
2339             {
2340               /* If Keyb.Com is NOT installed, let Right Alt behave
2341                  like the Left Alt.  */
2342               mask &= ~ALT_GR_P;
2343               mask |= ALT_P;
2344             }
2345         }
2346
2347       if (regs.h.ah & 1)                /* Left CTRL pressed ? */
2348         mask |= CTRL_P;
2349
2350       if (regs.h.ah & 4)                /* Right CTRL pressed ? */
2351         {
2352           if (dos_hyper_key == 2)
2353             {
2354               mask |= HYPER_P;
2355               modifiers |= hyper_modifier;
2356             }
2357           else if (dos_super_key == 2)
2358             {
2359               mask |= SUPER_P;
2360               modifiers |= super_modifier;
2361             }
2362           else
2363             mask |= CTRL_P;
2364         }
2365     }
2366
2367   if (mask & SHIFT_P)
2368     modifiers |= shift_modifier;
2369   if (mask & CTRL_P)
2370     modifiers |= ctrl_modifier;
2371   if (mask & ALT_P)
2372     modifiers |= meta_modifier;
2373
2374   if (keymask)
2375     *keymask = mask;
2376   return modifiers;
2377 }
2378
2379 #define NUM_RECENT_DOSKEYS (100)
2380 int recent_doskeys_index;       /* Index for storing next element into recent_doskeys */
2381 int total_doskeys;              /* Total number of elements stored into recent_doskeys */
2382 Lisp_Object recent_doskeys;     /* A vector, holding the last 100 keystrokes */
2383
2384 DEFUN ("recent-doskeys", Frecent_doskeys, Srecent_doskeys, 0, 0, 0,
2385        doc: /* Return vector of last 100 keyboard input values seen in dos_rawgetc.
2386 Each input key receives two values in this vector: first the ASCII code,
2387 and then the scan code.  */)
2388   (void)
2389 {
2390   Lisp_Object val, *keys = XVECTOR (recent_doskeys)->u.contents;
2391
2392   if (total_doskeys < NUM_RECENT_DOSKEYS)
2393     return Fvector (total_doskeys, keys);
2394   else
2395     {
2396       val = Fvector (NUM_RECENT_DOSKEYS, keys);
2397       vcopy (val, 0, keys + recent_doskeys_index,
2398              NUM_RECENT_DOSKEYS - recent_doskeys_index);
2399       vcopy (val, NUM_RECENT_DOSKEYS - recent_doskeys_index,
2400              keys, recent_doskeys_index);
2401       return val;
2402     }
2403 }
2404
2405 /* Get a char from keyboard.  Function keys are put into the event queue.  */
2406 static int
2407 dos_rawgetc (void)
2408 {
2409   struct input_event event;
2410   union REGS regs;
2411   Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (SELECTED_FRAME ());
2412   EVENT_INIT (event);
2413
2414 #ifndef HAVE_X_WINDOWS
2415   /* Maybe put the cursor where it should be.  */
2416   IT_cmgoto (SELECTED_FRAME ());
2417 #endif
2418
2419   /* The following condition is equivalent to `kbhit ()', except that
2420      it uses the bios to do its job.  This pleases DESQview/X.  */
2421   while ((regs.h.ah = extended_kbd ? 0x11 : 0x01),
2422          int86 (0x16, &regs, &regs),
2423          (regs.x.flags & 0x40) == 0)
2424     {
2425       union REGS regs;
2426       register unsigned char c;
2427       int modifiers, sc, code = -1, mask, kp_mode;
2428
2429       regs.h.ah = extended_kbd ? 0x10 : 0x00;
2430       int86 (0x16, &regs, &regs);
2431       c = regs.h.al;
2432       sc = regs.h.ah;
2433
2434       total_doskeys += 2;
2435       ASET (recent_doskeys, recent_doskeys_index, make_number (c));
2436       recent_doskeys_index++;
2437       if (recent_doskeys_index == NUM_RECENT_DOSKEYS)
2438         recent_doskeys_index = 0;
2439       ASET (recent_doskeys, recent_doskeys_index, make_number (sc));
2440       recent_doskeys_index++;
2441       if (recent_doskeys_index == NUM_RECENT_DOSKEYS)
2442         recent_doskeys_index = 0;
2443
2444       modifiers = dos_get_modifiers (&mask);
2445
2446 #ifndef HAVE_X_WINDOWS
2447       if (!NILP (Vdos_display_scancodes))
2448         {
2449           char buf[11];
2450           sprintf (buf, "%02x:%02x*%04x",
2451                    (unsigned) (sc&0xff), (unsigned) c, mask);
2452           dos_direct_output (screen_size_Y - 2, screen_size_X - 12, buf, 10);
2453         }
2454 #endif
2455
2456       if (sc == 0xe0)
2457         {
2458           switch (c)
2459             {
2460             case 10:            /* Ctrl Grey Enter */
2461               code = Ctrl | Grey | 4;
2462               break;
2463             case 13:            /* Grey Enter */
2464               code = Grey | 4;
2465               break;
2466             case '/':           /* Grey / */
2467               code = Grey | 0;
2468               break;
2469             default:
2470               continue;
2471             };
2472           c = 0;
2473         }
2474       else
2475         {
2476           /* Try the keyboard-private translation table first.  */
2477           if (keyboard->translate_table)
2478             {
2479               struct kbd_translate *p = keyboard->translate_table;
2480
2481               while (p->sc)
2482                 {
2483                   if (p->sc == sc && p->ch == c)
2484                     {
2485                       code = p->code;
2486                       break;
2487                     }
2488                   p++;
2489                 }
2490             }
2491           /* If the private table didn't translate it, use the general
2492              one.  */
2493           if (code == -1)
2494             {
2495               if (sc >= (sizeof (ibmpc_translate_map) / sizeof (short)))
2496                 continue;
2497               if ((code = ibmpc_translate_map[sc]) == Ignore)
2498                 continue;
2499             }
2500         }
2501
2502       if (c == 0)
2503         {
2504         /* We only look at the keyboard Ctrl/Shift/Alt keys when
2505            Emacs is ready to read a key.  Therefore, if they press
2506            `Alt-x' when Emacs is busy, by the time we get to
2507            `dos_get_modifiers', they might have already released the
2508            Alt key, and Emacs gets just `x', which is BAD.
2509            However, for keys with the `Map' property set, the ASCII
2510            code returns zero only if Alt is pressed.  So, when we DON'T
2511            have to support international_keyboard, we don't have to
2512            distinguish between the left and  right Alt keys, and we
2513            can set the META modifier for any keys with the `Map'
2514            property if they return zero ASCII code (c = 0).  */
2515         if ( (code & Alt)
2516              || ( (code & 0xf000) == Map && !international_keyboard))
2517             modifiers |= meta_modifier;
2518           if (code & Ctrl)
2519             modifiers |= ctrl_modifier;
2520           if (code & Shift)
2521             modifiers |= shift_modifier;
2522         }
2523
2524       switch (code & 0xf000)
2525         {
2526         case ModFct:
2527           if (c && !(mask & (SHIFT_P | ALT_P | CTRL_P | HYPER_P | SUPER_P)))
2528             return c;
2529           c = 0;                /* Special */
2530
2531         case FctKey:
2532           if (c != 0)
2533             return c;
2534
2535         case Special:
2536           code |= 0xff00;
2537           break;
2538
2539         case Normal:
2540           if (sc == 0)
2541             {
2542               if (c == 0)       /* ctrl-break */
2543                 continue;
2544               return c;         /* ALT-nnn */
2545             }
2546           if (!keyboard_map_all)
2547             {
2548               if (c != ' ')
2549                 return c;
2550               code = c;
2551               break;
2552             }
2553
2554         case Map:
2555           if (c && !(mask & ALT_P) && !((mask & SHIFT_P) && (mask & CTRL_P)))
2556             if (!keyboard_map_all)
2557               return c;
2558
2559           code &= 0xff;
2560           if (mask & ALT_P && code <= 10 && code > 0 && dos_keypad_mode & 0x200)
2561             mask |= SHIFT_P;    /* ALT-1 => M-! etc. */
2562
2563           if (mask & SHIFT_P)
2564             {
2565               code = keyboard->shifted[code];
2566               mask -= SHIFT_P;
2567               modifiers &= ~shift_modifier;
2568             }
2569           else
2570             if ((mask & ALT_GR_P) && keyboard->alt_gr && keyboard->alt_gr[code] != ' ')
2571               code = keyboard->alt_gr[code];
2572             else
2573               code = keyboard->unshifted[code];
2574           break;
2575
2576         case KeyPad:
2577           code &= 0xff;
2578           if (c == 0xe0)        /* edit key */
2579             kp_mode = 3;
2580           else
2581             if ((mask & (NUMLOCK_P|CTRL_P|SHIFT_P|ALT_P)) == NUMLOCK_P) /* numlock on */
2582               kp_mode = dos_keypad_mode & 0x03;
2583             else
2584               kp_mode = (dos_keypad_mode >> 4) & 0x03;
2585
2586           switch (kp_mode)
2587             {
2588             case 0:
2589               if (code == 10 && dos_decimal_point)
2590                 return dos_decimal_point;
2591               return keypad_translate_map[code].char_code;
2592
2593             case 1:
2594               code = 0xff00 | keypad_translate_map[code].keypad_code;
2595               break;
2596
2597             case 2:
2598               code = keypad_translate_map[code].meta_code;
2599               modifiers = meta_modifier;
2600               break;
2601
2602             case 3:
2603               code = 0xff00 | keypad_translate_map[code].editkey_code;
2604               break;
2605             }
2606           break;
2607
2608         case Grey:
2609           code &= 0xff;
2610           kp_mode = ((mask & (NUMLOCK_P|CTRL_P|SHIFT_P|ALT_P)) == NUMLOCK_P) ? 0x04 : 0x40;
2611           if (dos_keypad_mode & kp_mode)
2612             code = 0xff00 | grey_key_translate_map[code].keypad_code;
2613           else
2614             code = grey_key_translate_map[code].char_code;
2615           break;
2616         }
2617
2618       if (code == 0)
2619         continue;
2620
2621       if (!hlinfo->mouse_face_hidden && INTEGERP (Vmouse_highlight))
2622         {
2623           clear_mouse_face (hlinfo);
2624           hlinfo->mouse_face_hidden = 1;
2625         }
2626
2627       if (code >= 0x100)
2628         event.kind = NON_ASCII_KEYSTROKE_EVENT;
2629       else
2630         event.kind = ASCII_KEYSTROKE_EVENT;
2631       event.code = code;
2632       event.modifiers = modifiers;
2633       event.frame_or_window = selected_frame;
2634       event.arg = Qnil;
2635       event.timestamp = event_timestamp ();
2636       kbd_buffer_store_event (&event);
2637     }
2638
2639   if (have_mouse > 0 && !mouse_preempted)
2640     {
2641       int but, press, x, y, ok;
2642       int mouse_prev_x = mouse_last_x, mouse_prev_y = mouse_last_y;
2643       Lisp_Object mouse_window = Qnil;
2644
2645       /* Check for mouse movement *before* buttons.  */
2646       mouse_check_moved ();
2647
2648       /* If the mouse moved from the spot of its last sighting, we
2649          might need to update mouse highlight.  */
2650       if (mouse_last_x != mouse_prev_x || mouse_last_y != mouse_prev_y)
2651         {
2652           if (hlinfo->mouse_face_hidden)
2653             {
2654               hlinfo->mouse_face_hidden = 0;
2655               clear_mouse_face (hlinfo);
2656             }
2657
2658           /* Generate SELECT_WINDOW_EVENTs when needed.  */
2659           if (!NILP (Vmouse_autoselect_window))
2660             {
2661               static Lisp_Object last_mouse_window;
2662
2663               mouse_window = window_from_coordinates
2664                 (SELECTED_FRAME (), mouse_last_x, mouse_last_y, 0, 0);
2665               /* A window will be selected only when it is not
2666                  selected now, and the last mouse movement event was
2667                  not in it.  A minibuffer window will be selected iff
2668                  it is active.  */
2669               if (WINDOWP (mouse_window)
2670                   && !EQ (mouse_window, last_mouse_window)
2671                   && !EQ (mouse_window, selected_window))
2672                 {
2673                   event.kind = SELECT_WINDOW_EVENT;
2674                   event.frame_or_window = mouse_window;
2675                   event.arg = Qnil;
2676                   event.timestamp = event_timestamp ();
2677                   kbd_buffer_store_event (&event);
2678                 }
2679               /* Remember the last window where we saw the mouse.  */
2680               last_mouse_window = mouse_window;
2681             }
2682
2683           previous_help_echo_string = help_echo_string;
2684           help_echo_string = help_echo_object = help_echo_window = Qnil;
2685           help_echo_pos = -1;
2686           note_mouse_highlight (SELECTED_FRAME (), mouse_last_x, mouse_last_y);
2687           /* If the contents of the global variable help_echo has
2688              changed, generate a HELP_EVENT.  */
2689           if (!NILP (help_echo_string) || !NILP (previous_help_echo_string))
2690             gen_help_event (help_echo_string, selected_frame, help_echo_window,
2691                             help_echo_object, help_echo_pos);
2692         }
2693
2694       for (but = 0; but < NUM_MOUSE_BUTTONS; but++)
2695         for (press = 0; press < 2; press++)
2696           {
2697             int button_num = but;
2698
2699             if (press)
2700               ok = mouse_pressed (but, &x, &y);
2701             else
2702               ok = mouse_released (but, &x, &y);
2703             if (ok)
2704               {
2705                 /* Allow a simultaneous press/release of Mouse-1 and
2706                    Mouse-2 to simulate Mouse-3 on two-button mice.  */
2707                 if (mouse_button_count == 2 && but < 2)
2708                   {
2709                     int x2, y2; /* don't clobber original coordinates */
2710
2711                     /* If only one button is pressed, wait 100 msec and
2712                        check again.  This way, Speedy Gonzales isn't
2713                        punished, while the slow get their chance.  */
2714                     if ((press && mouse_pressed (1-but, &x2, &y2))
2715                         || (!press && mouse_released (1-but, &x2, &y2)))
2716                       button_num = 2;
2717                     else
2718                       {
2719                         delay (100);
2720                         if ((press && mouse_pressed (1-but, &x2, &y2))
2721                             || (!press && mouse_released (1-but, &x2, &y2)))
2722                           button_num = 2;
2723                       }
2724                   }
2725
2726                 event.kind = MOUSE_CLICK_EVENT;
2727                 event.code = button_num;
2728                 event.modifiers = dos_get_modifiers (0)
2729                   | (press ? down_modifier : up_modifier);
2730                 event.x = make_number (x);
2731                 event.y = make_number (y);
2732                 event.frame_or_window = selected_frame;
2733                 event.arg = Qnil;
2734                 event.timestamp = event_timestamp ();
2735                 kbd_buffer_store_event (&event);
2736               }
2737           }
2738     }
2739
2740   return -1;
2741 }
2742
2743 static int prev_get_char = -1;
2744
2745 /* Return 1 if a key is ready to be read without suspending execution.  */
2746 int
2747 dos_keysns (void)
2748 {
2749   if (prev_get_char != -1)
2750     return 1;
2751   else
2752     return ((prev_get_char = dos_rawgetc ()) != -1);
2753 }
2754
2755 /* Read a key.  Return -1 if no key is ready.  */
2756 int
2757 dos_keyread (void)
2758 {
2759   if (prev_get_char != -1)
2760     {
2761       int c = prev_get_char;
2762       prev_get_char = -1;
2763       return c;
2764     }
2765   else
2766     return dos_rawgetc ();
2767 }
2768 \f
2769 #ifndef HAVE_X_WINDOWS
2770
2771 /* Simulation of X's menus.  Nothing too fancy here -- just make it work
2772    for now.
2773
2774    Actually, I don't know the meaning of all the parameters of the functions
2775    here -- I only know how they are called by xmenu.c.  I could of course
2776    grab the nearest Xlib manual (down the hall, second-to-last door on the
2777    left), but I don't think it's worth the effort.  */
2778
2779 /* These hold text of the current and the previous menu help messages.  */
2780 static const char *menu_help_message, *prev_menu_help_message;
2781 /* Pane number and item number of the menu item which generated the
2782    last menu help message.  */
2783 static int menu_help_paneno, menu_help_itemno;
2784
2785 static XMenu *
2786 IT_menu_create (void)
2787 {
2788   XMenu *menu;
2789
2790   menu = xmalloc (sizeof (XMenu));
2791   menu->allocated = menu->count = menu->panecount = menu->width = 0;
2792   return menu;
2793 }
2794
2795 /* Allocate some (more) memory for MENU ensuring that there is room for one
2796    for item.  */
2797
2798 static void
2799 IT_menu_make_room (XMenu *menu)
2800 {
2801   if (menu->allocated == 0)
2802     {
2803       int count = menu->allocated = 10;
2804       menu->text = xmalloc (count * sizeof (char *));
2805       menu->submenu = xmalloc (count * sizeof (XMenu *));
2806       menu->panenumber = xmalloc (count * sizeof (int));
2807       menu->help_text = xmalloc (count * sizeof (char *));
2808     }
2809   else if (menu->allocated == menu->count)
2810     {
2811       int count = menu->allocated = menu->allocated + 10;
2812       menu->text
2813         = (char **) xrealloc (menu->text, count * sizeof (char *));
2814       menu->submenu
2815         = (XMenu **) xrealloc (menu->submenu, count * sizeof (XMenu *));
2816       menu->panenumber
2817         = (int *) xrealloc (menu->panenumber, count * sizeof (int));
2818       menu->help_text
2819         = (const char **) xrealloc (menu->help_text, count * sizeof (char *));
2820     }
2821 }
2822
2823 /* Search the given menu structure for a given pane number.  */
2824
2825 static XMenu *
2826 IT_menu_search_pane (XMenu *menu, int pane)
2827 {
2828   int i;
2829   XMenu *try;
2830
2831   for (i = 0; i < menu->count; i++)
2832     if (menu->submenu[i])
2833       {
2834         if (pane == menu->panenumber[i])
2835           return menu->submenu[i];
2836         if ((try = IT_menu_search_pane (menu->submenu[i], pane)))
2837           return try;
2838       }
2839   return (XMenu *) 0;
2840 }
2841
2842 /* Determine how much screen space a given menu needs.  */
2843
2844 static void
2845 IT_menu_calc_size (XMenu *menu, int *width, int *height)
2846 {
2847   int i, h2, w2, maxsubwidth, maxheight;
2848
2849   maxsubwidth = 0;
2850   maxheight = menu->count;
2851   for (i = 0; i < menu->count; i++)
2852     {
2853       if (menu->submenu[i])
2854         {
2855           IT_menu_calc_size (menu->submenu[i], &w2, &h2);
2856           if (w2 > maxsubwidth) maxsubwidth = w2;
2857           if (i + h2 > maxheight) maxheight = i + h2;
2858         }
2859     }
2860   *width = menu->width + maxsubwidth;
2861   *height = maxheight;
2862 }
2863
2864 /* Display MENU at (X,Y) using FACES.  */
2865
2866 #define BUILD_CHAR_GLYPH(GLYPH, CODE, FACE_ID, PADDING_P)  \
2867   do                                                       \
2868     {                                                      \
2869       (GLYPH).type = CHAR_GLYPH;                           \
2870       SET_CHAR_GLYPH ((GLYPH), CODE, FACE_ID, PADDING_P);  \
2871       (GLYPH).charpos = -1;                                \
2872     }                                                      \
2873   while (0)
2874
2875 static void
2876 IT_menu_display (XMenu *menu, int y, int x, int pn, int *faces, int disp_help)
2877 {
2878   int i, j, face, width,  mx, my, enabled, mousehere, row, col;
2879   struct glyph *text, *p;
2880   const unsigned char *q;
2881   struct frame *sf = SELECTED_FRAME ();
2882
2883   menu_help_message = NULL;
2884
2885   width = menu->width;
2886   /* We multiply width by 2 to account for possible control characters.
2887      FIXME: cater to non-ASCII characters in menus.  */
2888   text = xmalloc ((width * 2 + 2) * sizeof (struct glyph));
2889   ScreenGetCursor (&row, &col);
2890   mouse_get_xy (&mx, &my);
2891   IT_update_begin (sf);
2892   for (i = 0; i < menu->count; i++)
2893     {
2894       int max_width = width + 2;
2895
2896       IT_cursor_to (sf, y + i, x);
2897       enabled
2898         = (!menu->submenu[i] && menu->panenumber[i]) || (menu->submenu[i]);
2899       mousehere = (y + i == my && x <= mx && mx < x + max_width);
2900       face = faces[enabled + mousehere * 2];
2901       /* The following if clause means that we display the menu help
2902          strings even if the menu item is currently disabled.  */
2903       if (disp_help && enabled + mousehere * 2 >= 2)
2904         {
2905           menu_help_message = menu->help_text[i];
2906           menu_help_paneno = pn - 1;
2907           menu_help_itemno = i;
2908         }
2909       p = text;
2910       BUILD_CHAR_GLYPH (*p, ' ', face, 0);
2911       p++;
2912       for (j = 0, q = menu->text[i]; *q; j++)
2913         {
2914           unsigned c = STRING_CHAR_ADVANCE (q);
2915
2916           if (c > 26)
2917             {
2918               BUILD_CHAR_GLYPH (*p, c, face, 0);
2919               p++;
2920             }
2921           else  /* make '^x' */
2922             {
2923               BUILD_CHAR_GLYPH (*p, '^', face, 0);
2924               p++;
2925               j++;
2926               BUILD_CHAR_GLYPH (*p, c + 64, face, 0);
2927               p++;
2928             }
2929         }
2930       /* Don't let the menu text overflow into the next screen row.  */
2931       if (x + max_width > screen_size_X)
2932         {
2933           max_width = screen_size_X - x;
2934           text[max_width - 1].u.ch = '$'; /* indicate it's truncated */
2935         }
2936       for (; j < max_width - 2; j++, p++)
2937         BUILD_CHAR_GLYPH (*p, ' ', face, 0);
2938
2939       /* 16 is the character code of a character that on DOS terminal
2940          produces a nice-looking right-pointing arrow glyph.  */
2941       BUILD_CHAR_GLYPH (*p, menu->submenu[i] ? 16 : ' ', face, 0);
2942       p++;
2943       IT_write_glyphs (sf, text, max_width);
2944     }
2945   IT_update_end (sf);
2946   IT_cursor_to (sf, row, col);
2947   xfree (text);
2948 }
2949 \f
2950 /* --------------------------- X Menu emulation ---------------------- */
2951
2952 /* Create a brand new menu structure.  */
2953
2954 XMenu *
2955 XMenuCreate (Display *foo1, Window foo2, char *foo3)
2956 {
2957   return IT_menu_create ();
2958 }
2959
2960 /* Create a new pane and place it on the outer-most level.  It is not
2961    clear that it should be placed out there, but I don't know what else
2962    to do.  */
2963
2964 int
2965 XMenuAddPane (Display *foo, XMenu *menu, const char *txt, int enable)
2966 {
2967   int len;
2968   const char *p;
2969
2970   if (!enable)
2971     emacs_abort ();
2972
2973   IT_menu_make_room (menu);
2974   menu->submenu[menu->count] = IT_menu_create ();
2975   menu->text[menu->count] = (char *)txt;
2976   menu->panenumber[menu->count] = ++menu->panecount;
2977   menu->help_text[menu->count] = NULL;
2978   menu->count++;
2979
2980   /* Adjust length for possible control characters (which will
2981      be written as ^x).  */
2982   for (len = strlen (txt), p = txt; *p; p++)
2983     if (*p < 27)
2984       len++;
2985
2986   if (len > menu->width)
2987     menu->width = len;
2988
2989   return menu->panecount;
2990 }
2991
2992 /* Create a new item in a menu pane.  */
2993
2994 int
2995 XMenuAddSelection (Display *bar, XMenu *menu, int pane,
2996                    int foo, char *txt, int enable, char const *help_text)
2997 {
2998   int len;
2999   char *p;
3000
3001   if (pane)
3002     if (!(menu = IT_menu_search_pane (menu, pane)))
3003       return XM_FAILURE;
3004   IT_menu_make_room (menu);
3005   menu->submenu[menu->count] = (XMenu *) 0;
3006   menu->text[menu->count] = txt;
3007   menu->panenumber[menu->count] = enable;
3008   menu->help_text[menu->count] = help_text;
3009   menu->count++;
3010
3011   /* Adjust length for possible control characters (which will
3012      be written as ^x).  */
3013   for (len = strlen (txt), p = txt; *p; p++)
3014     if (*p < 27)
3015       len++;
3016
3017   if (len > menu->width)
3018     menu->width = len;
3019
3020   return XM_SUCCESS;
3021 }
3022
3023 /* Decide where the menu would be placed if requested at (X,Y).  */
3024
3025 void
3026 XMenuLocate (Display *foo0, XMenu *menu, int foo1, int foo2, int x, int y,
3027              int *ulx, int *uly, int *width, int *height)
3028 {
3029   IT_menu_calc_size (menu, width, height);
3030   *ulx = x + 1;
3031   *uly = y;
3032   *width += 2;
3033 }
3034
3035 struct IT_menu_state
3036 {
3037   void *screen_behind;
3038   XMenu *menu;
3039   int pane;
3040   int x, y;
3041 };
3042
3043
3044 /* Display menu, wait for user's response, and return that response.  */
3045
3046 int
3047 XMenuActivate (Display *foo, XMenu *menu, int *pane, int *selidx,
3048                int x0, int y0, unsigned ButtonMask, char **txt,
3049                void (*help_callback)(char const *, int, int))
3050 {
3051   struct IT_menu_state *state;
3052   int statecount, x, y, i, b, screensize, leave, result, onepane;
3053   int title_faces[4];           /* face to display the menu title */
3054   int faces[4], buffers_num_deleted = 0;
3055   struct frame *sf = SELECTED_FRAME ();
3056   Lisp_Object saved_echo_area_message, selectface;
3057
3058   /* Just in case we got here without a mouse present...  */
3059   if (have_mouse <= 0)
3060     return XM_IA_SELECT;
3061   /* Don't allow non-positive x0 and y0, lest the menu will wrap
3062      around the display.  */
3063   if (x0 <= 0)
3064     x0 = 1;
3065   if (y0 <= 0)
3066     y0 = 1;
3067
3068   /* We will process all the mouse events directly, so we had
3069      better prevent dos_rawgetc from stealing them from us.  */
3070   mouse_preempted++;
3071
3072   state = alloca (menu->panecount * sizeof (struct IT_menu_state));
3073   screensize = screen_size * 2;
3074   faces[0]
3075     = lookup_derived_face (sf, intern ("msdos-menu-passive-face"),
3076                            DEFAULT_FACE_ID, 1);
3077   faces[1]
3078     = lookup_derived_face (sf, intern ("msdos-menu-active-face"),
3079                            DEFAULT_FACE_ID, 1);
3080   selectface = intern ("msdos-menu-select-face");
3081   faces[2] = lookup_derived_face (sf, selectface,
3082                                   faces[0], 1);
3083   faces[3] = lookup_derived_face (sf, selectface,
3084                                   faces[1], 1);
3085
3086   /* Make sure the menu title is always displayed with
3087      `msdos-menu-active-face', no matter where the mouse pointer is.  */
3088   for (i = 0; i < 4; i++)
3089     title_faces[i] = faces[3];
3090
3091   statecount = 1;
3092
3093   /* Don't let the title for the "Buffers" popup menu include a
3094      digit (which is ugly).
3095
3096      This is a terrible kludge, but I think the "Buffers" case is
3097      the only one where the title includes a number, so it doesn't
3098      seem to be necessary to make this more general.  */
3099   if (strncmp (menu->text[0], "Buffers 1", 9) == 0)
3100     {
3101       menu->text[0][7] = '\0';
3102       buffers_num_deleted = 1;
3103     }
3104
3105   /* We need to save the current echo area message, so that we could
3106      restore it below, before we exit.  See the commentary below,
3107      before the call to message_with_string.  */
3108   saved_echo_area_message = Fcurrent_message ();
3109   state[0].menu = menu;
3110   mouse_off ();
3111   ScreenRetrieve (state[0].screen_behind = xmalloc (screensize));
3112
3113   /* Turn off the cursor.  Otherwise it shows through the menu
3114      panes, which is ugly.  */
3115   IT_display_cursor (0);
3116
3117   /* Display the menu title.  */
3118   IT_menu_display (menu, y0 - 1, x0 - 1, 1, title_faces, 0);
3119   if (buffers_num_deleted)
3120     menu->text[0][7] = ' ';
3121   if ((onepane = menu->count == 1 && menu->submenu[0]))
3122     {
3123       menu->width = menu->submenu[0]->width;
3124       state[0].menu = menu->submenu[0];
3125     }
3126   else
3127     {
3128       state[0].menu = menu;
3129     }
3130   state[0].x = x0 - 1;
3131   state[0].y = y0;
3132   state[0].pane = onepane;
3133
3134   mouse_last_x = -1;  /* A hack that forces display.  */
3135   leave = 0;
3136   while (!leave)
3137     {
3138       if (!mouse_visible) mouse_on ();
3139       mouse_check_moved ();
3140       if (sf->mouse_moved)
3141         {
3142           sf->mouse_moved = 0;
3143           result = XM_IA_SELECT;
3144           mouse_get_xy (&x, &y);
3145           for (i = 0; i < statecount; i++)
3146             if (state[i].x <= x && x < state[i].x + state[i].menu->width + 2)
3147               {
3148                 int dy = y - state[i].y;
3149                 if (0 <= dy && dy < state[i].menu->count)
3150                   {
3151                     if (!state[i].menu->submenu[dy])
3152                       {
3153                         if (state[i].menu->panenumber[dy])
3154                           result = XM_SUCCESS;
3155                         else
3156                           result = XM_IA_SELECT;
3157                       }
3158                     *pane = state[i].pane - 1;
3159                     *selidx = dy;
3160                     /* We hit some part of a menu, so drop extra menus that
3161                        have been opened.  That does not include an open and
3162                        active submenu.  */
3163                     if (i != statecount - 2
3164                         || state[i].menu->submenu[dy] != state[i+1].menu)
3165                       while (i != statecount - 1)
3166                         {
3167                           statecount--;
3168                           mouse_off ();
3169                           ScreenUpdate (state[statecount].screen_behind);
3170                           if (screen_virtual_segment)
3171                             dosv_refresh_virtual_screen (0, screen_size);
3172                           xfree (state[statecount].screen_behind);
3173                         }
3174                     if (i == statecount - 1 && state[i].menu->submenu[dy])
3175                       {
3176                         IT_menu_display (state[i].menu,
3177                                          state[i].y,
3178                                          state[i].x,
3179                                          state[i].pane,
3180                                          faces, 1);
3181                         state[statecount].menu = state[i].menu->submenu[dy];
3182                         state[statecount].pane = state[i].menu->panenumber[dy];
3183                         mouse_off ();
3184                         ScreenRetrieve (state[statecount].screen_behind
3185                                         = xmalloc (screensize));
3186                         state[statecount].x
3187                           = state[i].x + state[i].menu->width + 2;
3188                         state[statecount].y = y;
3189                         statecount++;
3190                       }
3191                   }
3192               }
3193           IT_menu_display (state[statecount - 1].menu,
3194                            state[statecount - 1].y,
3195                            state[statecount - 1].x,
3196                            state[statecount - 1].pane,
3197                            faces, 1);
3198         }
3199       else
3200         {
3201           if ((menu_help_message || prev_menu_help_message)
3202               && menu_help_message != prev_menu_help_message)
3203             {
3204               help_callback (menu_help_message,
3205                              menu_help_paneno, menu_help_itemno);
3206               IT_display_cursor (0);
3207               prev_menu_help_message = menu_help_message;
3208             }
3209           /* We are busy-waiting for the mouse to move, so let's be nice
3210              to other Windows applications by releasing our time slice.  */
3211           __dpmi_yield ();
3212         }
3213       for (b = 0; b < mouse_button_count && !leave; b++)
3214         {
3215           /* Only leave if user both pressed and released the mouse, and in
3216              that order.  This avoids popping down the menu pane unless
3217              the user is really done with it.  */
3218           if (mouse_pressed (b, &x, &y))
3219             {
3220               while (mouse_button_depressed (b, &x, &y))
3221                 __dpmi_yield ();
3222               leave = 1;
3223             }
3224           (void) mouse_released (b, &x, &y);
3225         }
3226     }
3227
3228   mouse_off ();
3229   ScreenUpdate (state[0].screen_behind);
3230   if (screen_virtual_segment)
3231     dosv_refresh_virtual_screen (0, screen_size);
3232
3233   /* We have a situation here.  ScreenUpdate has just restored the
3234      screen contents as it was before we started drawing this menu.
3235      That includes any echo area message that could have been
3236      displayed back then.  (In reality, that echo area message will
3237      almost always be the ``keystroke echo'' that echoes the sequence
3238      of menu items chosen by the user.)  However, if the menu had some
3239      help messages, then displaying those messages caused Emacs to
3240      forget about the original echo area message.  So when
3241      ScreenUpdate restored it, it created a discrepancy between the
3242      actual screen contents and what Emacs internal data structures
3243      know about it.
3244
3245      To avoid this conflict, we force Emacs to restore the original
3246      echo area message as we found it when we entered this function.
3247      The irony of this is that we then erase the restored message
3248      right away, so the only purpose of restoring it is so that
3249      erasing it works correctly...  */
3250   if (! NILP (saved_echo_area_message))
3251     message_with_string ("%s", saved_echo_area_message, 0);
3252   message1 (0);
3253   while (statecount--)
3254     xfree (state[statecount].screen_behind);
3255   IT_display_cursor (1);        /* Turn cursor back on.  */
3256   /* Clean up any mouse events that are waiting inside Emacs event queue.
3257      These events are likely to be generated before the menu was even
3258      displayed, probably because the user pressed and released the button
3259      (which invoked the menu) too quickly.  If we don't remove these events,
3260      Emacs will process them after we return and surprise the user.  */
3261   discard_mouse_events ();
3262   mouse_clear_clicks ();
3263   if (!kbd_buffer_events_waiting ())
3264     clear_input_pending ();
3265   /* Allow mouse events generation by dos_rawgetc.  */
3266   mouse_preempted--;
3267   return result;
3268 }
3269
3270 /* Dispose of a menu.  */
3271
3272 void
3273 XMenuDestroy (Display *foo, XMenu *menu)
3274 {
3275   int i;
3276   if (menu->allocated)
3277     {
3278       for (i = 0; i < menu->count; i++)
3279         if (menu->submenu[i])
3280           XMenuDestroy (foo, menu->submenu[i]);
3281       xfree (menu->text);
3282       xfree (menu->submenu);
3283       xfree (menu->panenumber);
3284       xfree (menu->help_text);
3285     }
3286   xfree (menu);
3287   menu_help_message = prev_menu_help_message = NULL;
3288 }
3289 #endif /* !HAVE_X_WINDOWS */
3290 \f
3291 /* ----------------------- DOS / UNIX conversion --------------------- */
3292
3293 void msdos_downcase_filename (unsigned char *);
3294
3295 /* Destructively turn backslashes into slashes.  */
3296
3297 void
3298 dostounix_filename (char *p, int ignore)
3299 {
3300   msdos_downcase_filename (p);
3301
3302   while (*p)
3303     {
3304       if (*p == '\\')
3305         *p = '/';
3306       p++;
3307     }
3308 }
3309
3310 /* Destructively turn slashes into backslashes.  */
3311
3312 void
3313 unixtodos_filename (char *p)
3314 {
3315   if (p[1] == ':' && *p >= 'A' && *p <= 'Z')
3316     {
3317       *p += 'a' - 'A';
3318       p += 2;
3319     }
3320
3321   while (*p)
3322     {
3323       if (*p == '/')
3324         *p = '\\';
3325       p++;
3326     }
3327 }
3328
3329 /* Get the default directory for a given drive.  0=def, 1=A, 2=B, ...  */
3330
3331 int
3332 getdefdir (int drive, char *dst)
3333 {
3334   char in_path[4], *p = in_path, e = errno;
3335
3336   /* Generate "X:." (when drive is X) or "." (when drive is 0).  */
3337   if (drive != 0)
3338     {
3339       *p++ = drive + 'A' - 1;
3340       *p++ = ':';
3341     }
3342
3343   *p++ = '.';
3344   *p = '\0';
3345   errno = 0;
3346   _fixpath (in_path, dst);
3347     /* _fixpath can set errno to ENOSYS on non-LFN systems because
3348        it queries the LFN support, so ignore that error.  */
3349   if ((errno && errno != ENOSYS) || *dst == '\0')
3350     return 0;
3351
3352   msdos_downcase_filename (dst);
3353
3354   errno = e;
3355   return 1;
3356 }
3357
3358 char *
3359 emacs_root_dir (void)
3360 {
3361   static char root_dir[4];
3362
3363   sprintf (root_dir, "%c:/", 'A' + getdisk ());
3364   root_dir[0] = tolower (root_dir[0]);
3365   return root_dir;
3366 }
3367
3368 /* Remove all CR's that are followed by a LF.  */
3369
3370 int
3371 crlf_to_lf (int n, unsigned char *buf)
3372 {
3373   unsigned char *np = buf, *startp = buf, *endp = buf + n;
3374
3375   if (n == 0)
3376     return n;
3377   while (buf < endp - 1)
3378     {
3379       if (*buf == 0x0d)
3380         {
3381           if (*(++buf) != 0x0a)
3382             *np++ = 0x0d;
3383         }
3384       else
3385         *np++ = *buf++;
3386     }
3387   if (buf < endp)
3388     *np++ = *buf++;
3389   return np - startp;
3390 }
3391
3392 DEFUN ("msdos-long-file-names", Fmsdos_long_file_names, Smsdos_long_file_names,
3393        0, 0, 0,
3394        doc: /* Return non-nil if long file names are supported on MS-DOS.  */)
3395   (void)
3396 {
3397   return (_USE_LFN ? Qt : Qnil);
3398 }
3399
3400 /* Convert alphabetic characters in a filename to lower-case.  */
3401
3402 void
3403 msdos_downcase_filename (unsigned char *p)
3404 {
3405   /* Always lower-case drive letters a-z, even if the filesystem
3406      preserves case in filenames.
3407      This is so MSDOS filenames could be compared by string comparison
3408      functions that are case-sensitive.  Even case-preserving filesystems
3409      do not distinguish case in drive letters.  */
3410   if (p[1] == ':' && *p >= 'A' && *p <= 'Z')
3411     {
3412       *p += 'a' - 'A';
3413       p += 2;
3414     }
3415
3416   /* Under LFN we expect to get pathnames in their true case.  */
3417   if (NILP (Fmsdos_long_file_names ()))
3418     for ( ; *p; p++)
3419       if (*p >= 'A' && *p <= 'Z')
3420         *p += 'a' - 'A';
3421 }
3422
3423 DEFUN ("msdos-downcase-filename", Fmsdos_downcase_filename, Smsdos_downcase_filename,
3424        1, 1, 0,
3425        doc: /* Convert alphabetic characters in FILENAME to lower case and return that.
3426 When long filenames are supported, doesn't change FILENAME.
3427 If FILENAME is not a string, returns nil.
3428 The argument object is never altered--the value is a copy.  */)
3429   (Lisp_Object filename)
3430 {
3431   Lisp_Object tem;
3432
3433   if (! STRINGP (filename))
3434     return Qnil;
3435
3436   tem = Fcopy_sequence (filename);
3437   msdos_downcase_filename (SDATA (tem));
3438   return tem;
3439 }
3440 \f
3441 /* The Emacs root directory as determined by init_environment.  */
3442
3443 static char emacsroot[MAXPATHLEN];
3444
3445 char *
3446 rootrelativepath (char *rel)
3447 {
3448   static char result[MAXPATHLEN + 10];
3449
3450   strcpy (result, emacsroot);
3451   strcat (result, "/");
3452   strcat (result, rel);
3453   return result;
3454 }
3455
3456 /* Define a lot of environment variables if not already defined.  Don't
3457    remove anything unless you know what you're doing -- lots of code will
3458    break if one or more of these are missing.  */
3459
3460 void
3461 init_environment (int argc, char **argv, int skip_args)
3462 {
3463   char *s, *t, *root;
3464   int len, i;
3465   static const char * const tempdirs[] = {
3466     "$TMPDIR", "$TEMP", "$TMP", "c:/"
3467   };
3468   const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);
3469
3470   /* Make sure they have a usable $TMPDIR.  Many Emacs functions use
3471      temporary files and assume "/tmp" if $TMPDIR is unset, which
3472      will break on DOS/Windows.  Refuse to work if we cannot find
3473      a directory, not even "c:/", usable for that purpose.  */
3474   for (i = 0; i < imax ; i++)
3475     {
3476       const char *tmp = tempdirs[i];
3477       char buf[FILENAME_MAX];
3478
3479       if (*tmp == '$')
3480         {
3481           int tmp_len;
3482
3483           tmp = getenv (tmp + 1);
3484           if (!tmp)
3485             continue;
3486
3487           /* Some lusers set TMPDIR=e:, probably because some losing
3488              programs cannot handle multiple slashes if they use e:/.
3489              e: fails in `access' below, so we interpret e: as e:/.  */
3490           tmp_len = strlen (tmp);
3491           if (tmp[tmp_len - 1] != '/' && tmp[tmp_len - 1] != '\\')
3492             {
3493               strcpy (buf, tmp);
3494               buf[tmp_len++] = '/', buf[tmp_len] = 0;
3495               tmp = buf;
3496             }
3497         }
3498
3499       /* Note that `access' can lie to us if the directory resides on a
3500          read-only filesystem, like CD-ROM or a write-protected floppy.
3501          The only way to be really sure is to actually create a file and
3502          see if it succeeds.  But I think that's too much to ask.  */
3503       if (tmp && access (tmp, D_OK) == 0)
3504         {
3505           setenv ("TMPDIR", tmp, 1);
3506           break;
3507         }
3508     }
3509   if (i >= imax)
3510     cmd_error_internal
3511       (Fcons (Qerror,
3512               Fcons (build_string ("no usable temporary directories found!!"),
3513                      Qnil)),
3514        "While setting TMPDIR: ");
3515
3516   /* Note the startup time, so we know not to clear the screen if we
3517      exit immediately; see IT_reset_terminal_modes.
3518      (Yes, I know `clock' returns zero the first time it's called, but
3519      I do this anyway, in case some wiseguy changes that at some point.)  */
3520   startup_time = clock ();
3521
3522   /* Find our root from argv[0].  Assuming argv[0] is, say,
3523      "c:/emacs/bin/emacs.exe" our root will be "c:/emacs".  */
3524   root = alloca (MAXPATHLEN + 20);
3525   _fixpath (argv[0], root);
3526   msdos_downcase_filename (root);
3527   len = strlen (root);
3528   while (len > 0 && root[len] != '/' && root[len] != ':')
3529     len--;
3530   root[len] = '\0';
3531   if (len > 4
3532       && (strcmp (root + len - 4, "/bin") == 0
3533           || strcmp (root + len - 4, "/src") == 0)) /* under a debugger */
3534     root[len - 4] = '\0';
3535   else
3536     strcpy (root, "c:/emacs");  /* let's be defensive */
3537   len = strlen (root);
3538   strcpy (emacsroot, root);
3539
3540   /* We default HOME to our root.  */
3541   setenv ("HOME", root, 0);
3542
3543   /* We default EMACSPATH to root + "/bin".  */
3544   strcpy (root + len, "/bin");
3545   setenv ("EMACSPATH", root, 0);
3546
3547   /* I don't expect anybody to ever use other terminals so the internal
3548      terminal is the default.  */
3549   setenv ("TERM", "internal", 0);
3550
3551 #ifdef HAVE_X_WINDOWS
3552   /* Emacs expects DISPLAY to be set.  */
3553   setenv ("DISPLAY", "unix:0.0", 0);
3554 #endif
3555
3556   /* SHELL is a bit tricky -- COMSPEC is the closest we come, but we must
3557      downcase it and mirror the backslashes.  */
3558   s = getenv ("COMSPEC");
3559   if (!s) s = "c:/command.com";
3560   t = alloca (strlen (s) + 1);
3561   strcpy (t, s);
3562   dostounix_filename (t, 0);
3563   setenv ("SHELL", t, 0);
3564
3565   /* PATH is also downcased and backslashes mirrored.  */
3566   s = getenv ("PATH");
3567   if (!s) s = "";
3568   t = alloca (strlen (s) + 3);
3569   /* Current directory is always considered part of MsDos's path but it is
3570      not normally mentioned.  Now it is.  */
3571   strcat (strcpy (t, ".;"), s);
3572   dostounix_filename (t, 0); /* Not a single file name, but this should work.  */
3573   setenv ("PATH", t, 1);
3574
3575   /* In some sense all dos users have root privileges, so...  */
3576   setenv ("USER", "root", 0);
3577   setenv ("NAME", getenv ("USER"), 0);
3578
3579   /* Time zone determined from country code.  To make this possible, the
3580      country code may not span more than one time zone.  In other words,
3581      in the USA, you lose.  */
3582   if (!getenv ("TZ"))
3583     switch (dos_country_code)
3584       {
3585       case 31:                  /* Belgium */
3586       case 32:                  /* The Netherlands */
3587       case 33:                  /* France */
3588       case 34:                  /* Spain */
3589       case 36:                  /* Hungary */
3590       case 38:                  /* Yugoslavia (or what's left of it?) */
3591       case 39:                  /* Italy */
3592       case 41:                  /* Switzerland */
3593       case 42:                  /* Tjekia */
3594       case 45:                  /* Denmark */
3595       case 46:                  /* Sweden */
3596       case 47:                  /* Norway */
3597       case 48:                  /* Poland */
3598       case 49:                  /* Germany */
3599         /* Daylight saving from last Sunday in March to last Sunday in
3600            September, both at 2AM.  */
3601         setenv ("TZ", "MET-01METDST-02,M3.5.0/02:00,M9.5.0/02:00", 0);
3602         break;
3603       case 44:                  /* United Kingdom */
3604       case 351:                 /* Portugal */
3605       case 354:                 /* Iceland */
3606         setenv ("TZ", "GMT+00", 0);
3607         break;
3608       case 81:                  /* Japan */
3609       case 82:                  /* Korea */
3610         setenv ("TZ", "JST-09", 0);
3611         break;
3612       case 90:                  /* Turkey */
3613       case 358:                 /* Finland */
3614         setenv ("TZ", "EET-02", 0);
3615         break;
3616       case 972:                 /* Israel */
3617         /* This is an approximation.  (For exact rules, use the
3618            `zoneinfo/israel' file which comes with DJGPP, but you need
3619            to install it in `/usr/share/zoneinfo/' directory first.)  */
3620         setenv ("TZ", "IST-02IDT-03,M4.1.6/00:00,M9.5.6/01:00", 0);
3621         break;
3622       }
3623   tzset ();
3624 }
3625
3626 \f
3627
3628 static int break_stat;   /* BREAK check mode status.    */
3629 static int stdin_stat;   /* stdin IOCTL status.         */
3630
3631 /* Turn off Dos' Ctrl-C checking and inhibit interpretation of
3632    control chars by DOS.   Determine the keyboard type.  */
3633
3634 int
3635 dos_ttraw (struct tty_display_info *tty)
3636 {
3637   union REGS inregs, outregs;
3638   static int first_time = 1;
3639
3640   /* If we are called for the initial terminal, it's too early to do
3641      anything, and termscript isn't set up.  */
3642   if (tty->terminal->type == output_initial)
3643     return 2;
3644
3645   break_stat = getcbrk ();
3646   setcbrk (0);
3647
3648   if (first_time)
3649     {
3650       inregs.h.ah = 0xc0;
3651       int86 (0x15, &inregs, &outregs);
3652       extended_kbd = (!outregs.x.cflag) && (outregs.h.ah == 0);
3653
3654       have_mouse = 0;
3655
3656       if (1
3657 #ifdef HAVE_X_WINDOWS
3658           && inhibit_window_system
3659 #endif
3660           )
3661         {
3662           inregs.x.ax = 0x0021;
3663           int86 (0x33, &inregs, &outregs);
3664           have_mouse = (outregs.x.ax & 0xffff) == 0xffff;
3665           if (!have_mouse)
3666             {
3667               /* Reportedly, the above doesn't work for some mouse drivers.  There
3668                  is an additional detection method that should work, but might be
3669                  a little slower.  Use that as an alternative.  */
3670               inregs.x.ax = 0x0000;
3671               int86 (0x33, &inregs, &outregs);
3672               have_mouse = (outregs.x.ax & 0xffff) == 0xffff;
3673             }
3674           if (have_mouse)
3675             mouse_button_count = outregs.x.bx;
3676
3677 #ifndef HAVE_X_WINDOWS
3678           /* Save the cursor shape used outside Emacs.  */
3679           outside_cursor = _farpeekw (_dos_ds, 0x460);
3680 #endif
3681         }
3682
3683       first_time = 0;
3684
3685       stdin_stat = setmode (fileno (stdin), O_BINARY);
3686       return (stdin_stat != -1);
3687     }
3688   else
3689     return (setmode (fileno (stdin), O_BINARY) != -1);
3690 }
3691
3692 /*  Restore status of standard input and Ctrl-C checking.  */
3693
3694 int
3695 dos_ttcooked (void)
3696 {
3697   union REGS inregs, outregs;
3698
3699   setcbrk (break_stat);
3700   mouse_off ();
3701
3702 #ifndef HAVE_X_WINDOWS
3703   /* Restore the cursor shape we found on startup.  */
3704   if (outside_cursor)
3705     {
3706       inregs.h.ah = 1;
3707       inregs.x.cx = outside_cursor;
3708       int86 (0x10, &inregs, &outregs);
3709     }
3710 #endif
3711
3712   return (setmode (fileno (stdin), stdin_stat) != -1);
3713 }
3714
3715 \f
3716 /* Run command as specified by ARGV in directory DIR.
3717    The command is run with input from TEMPIN, output to
3718    file TEMPOUT and stderr to TEMPERR.  */
3719
3720 int
3721 run_msdos_command (unsigned char **argv, const char *working_dir,
3722                    int tempin, int tempout, int temperr, char **envv)
3723 {
3724   char *saveargv1, *saveargv2, *lowcase_argv0, *pa, *pl;
3725   char oldwd[MAXPATHLEN + 1]; /* Fixed size is safe on MSDOS.  */
3726   int msshell, result = -1, inbak, outbak, errbak, x, y;
3727   Lisp_Object cmd;
3728
3729   /* Get current directory as MSDOS cwd is not per-process.  */
3730   getwd (oldwd);
3731
3732   /* If argv[0] is the shell, it might come in any lettercase.
3733      Since `Fmember' is case-sensitive, we need to downcase
3734      argv[0], even if we are on case-preserving filesystems.  */
3735   lowcase_argv0 = alloca (strlen (argv[0]) + 1);
3736   for (pa = argv[0], pl = lowcase_argv0; *pa; pl++)
3737     {
3738       *pl = *pa++;
3739       if (*pl >= 'A' && *pl <= 'Z')
3740         *pl += 'a' - 'A';
3741     }
3742   *pl = '\0';
3743
3744   cmd = Ffile_name_nondirectory (build_string (lowcase_argv0));
3745   msshell = !NILP (Fmember (cmd, Fsymbol_value (intern ("msdos-shells"))))
3746     && !strcmp ("-c", argv[1]);
3747   if (msshell)
3748     {
3749       saveargv1 = argv[1];
3750       saveargv2 = argv[2];
3751       argv[1] = "/c";
3752       /* We only need to mirror slashes if a DOS shell will be invoked
3753          not via `system' (which does the mirroring itself).  Yes, that
3754          means DJGPP v1.x will lose here.  */
3755       if (argv[2] && argv[3])
3756         {
3757           char *p = alloca (strlen (argv[2]) + 1);
3758
3759           strcpy (argv[2] = p, saveargv2);
3760           while (*p && isspace (*p))
3761             p++;
3762           while (*p)
3763             {
3764               if (*p == '/')
3765                 *p++ = '\\';
3766               else
3767                 p++;
3768             }
3769         }
3770     }
3771
3772   chdir (working_dir);
3773   inbak = dup (0);
3774   outbak = dup (1);
3775   errbak = dup (2);
3776   if (inbak < 0 || outbak < 0 || errbak < 0)
3777     goto done; /* Allocation might fail due to lack of descriptors.  */
3778
3779   if (have_mouse > 0)
3780     mouse_get_xy (&x, &y);
3781
3782   if (!noninteractive)
3783     dos_ttcooked ();    /* do it here while 0 = stdin */
3784
3785   dup2 (tempin, 0);
3786   dup2 (tempout, 1);
3787   dup2 (temperr, 2);
3788
3789   if (msshell && !argv[3])
3790     {
3791       /* MS-DOS native shells are too restrictive.  For starters, they
3792          cannot grok commands longer than 126 characters.  In DJGPP v2
3793          and later, `system' is much smarter, so we'll call it instead.  */
3794
3795       const char *cmnd;
3796
3797       /* A shell gets a single argument--its full command
3798          line--whose original was saved in `saveargv2'.  */
3799
3800       /* Don't let them pass empty command lines to `system', since
3801          with some shells it will try to invoke an interactive shell,
3802          which will hang Emacs.  */
3803       for (cmnd = saveargv2; *cmnd && isspace (*cmnd); cmnd++)
3804         ;
3805       if (*cmnd)
3806         {
3807           extern char **environ;
3808           char **save_env = environ;
3809           int save_system_flags = __system_flags;
3810
3811           /* Request the most powerful version of `system'.  We need
3812              all the help we can get to avoid calling stock DOS shells.  */
3813           __system_flags =  (__system_redirect
3814                              | __system_use_shell
3815                              | __system_allow_multiple_cmds
3816                              | __system_allow_long_cmds
3817                              | __system_handle_null_commands
3818                              | __system_emulate_chdir);
3819
3820           environ = envv;
3821           result = system (cmnd);
3822           __system_flags = save_system_flags;
3823           environ = save_env;
3824         }
3825       else
3826         result = 0;     /* emulate Unixy shell behavior with empty cmd line */
3827     }
3828   else
3829     result = spawnve (P_WAIT, argv[0], (char **)argv, envv);
3830
3831   dup2 (inbak, 0);
3832   dup2 (outbak, 1);
3833   dup2 (errbak, 2);
3834   emacs_close (inbak);
3835   emacs_close (outbak);
3836   emacs_close (errbak);
3837
3838   if (!noninteractive)
3839     dos_ttraw (CURTTY ());
3840   if (have_mouse > 0)
3841     {
3842       mouse_init ();
3843       mouse_moveto (x, y);
3844     }
3845
3846   /* Some programs might change the meaning of the highest bit of the
3847      text attribute byte, so we get blinking characters instead of the
3848      bright background colors.  Restore that.  */
3849   if (!noninteractive)
3850     bright_bg ();
3851
3852  done:
3853   chdir (oldwd);
3854   if (msshell)
3855     {
3856       argv[1] = saveargv1;
3857       argv[2] = saveargv2;
3858     }
3859   return result;
3860 }
3861
3862 void
3863 croak (char *badfunc)
3864 {
3865   fprintf (stderr, "%s not yet implemented\r\n", badfunc);
3866   reset_all_sys_modes ();
3867   exit (1);
3868 }
3869 \f
3870 /*
3871  * A few unimplemented functions that we silently ignore.
3872  */
3873 pid_t tcgetpgrp (int fd) { return 0; }
3874 int setpgid (int pid, int pgid) { return 0; }
3875 int setpriority (int x, int y, int z) { return 0; }
3876 pid_t setsid (void) { return 0; }
3877
3878 #if __DJGPP__ == 2 && __DJGPP_MINOR__ < 4
3879 ssize_t
3880 readlink (const char *name, char *dummy1, size_t dummy2)
3881 {
3882   /* `access' is much faster than `stat' on MS-DOS.  */
3883   if (access (name, F_OK) == 0)
3884     errno = EINVAL;
3885   return -1;
3886 }
3887 #endif
3888
3889 char *
3890 careadlinkat (int fd, char const *filename,
3891               char *buffer, size_t buffer_size,
3892               struct allocator const *alloc,
3893               ssize_t (*preadlinkat) (int, char const *, char *, size_t))
3894 {
3895   if (!buffer)
3896     {
3897       /* We don't support the fancy auto-allocation feature.  */
3898       if (!buffer_size)
3899         errno = ENOSYS;
3900       else
3901         errno = EINVAL;
3902       buffer = NULL;
3903     }
3904   else
3905     {
3906       ssize_t len = preadlinkat (fd, filename, buffer, buffer_size);
3907
3908       if (len < 0 || len == buffer_size)
3909         buffer = NULL;
3910       else
3911         buffer[len + 1] = '\0';
3912     }
3913   return buffer;
3914 }
3915
3916 \f
3917 #if __DJGPP__ == 2 && __DJGPP_MINOR__ < 2
3918
3919 /* Augment DJGPP library POSIX signal functions.  This is needed
3920    as of DJGPP v2.01, but might be in the library in later releases. */
3921
3922 #include <libc/bss.h>
3923
3924 /* A counter to know when to re-initialize the static sets.  */
3925 static int sigprocmask_count = -1;
3926
3927 /* Which signals are currently blocked (initially none).  */
3928 static sigset_t current_mask;
3929
3930 /* Which signals are pending (initially none).  */
3931 static sigset_t msdos_pending_signals;
3932
3933 /* Previous handlers to restore when the blocked signals are unblocked.  */
3934 typedef void (*sighandler_t)(int);
3935 static sighandler_t prev_handlers[320];
3936
3937 /* A signal handler which just records that a signal occurred
3938    (it will be raised later, if and when the signal is unblocked).  */
3939 static void
3940 sig_suspender (int signo)
3941 {
3942   sigaddset (&msdos_pending_signals, signo);
3943 }
3944
3945 int
3946 sigprocmask (int how, const sigset_t *new_set, sigset_t *old_set)
3947 {
3948   int signo;
3949   sigset_t new_mask;
3950
3951   /* If called for the first time, initialize.  */
3952   if (sigprocmask_count != __bss_count)
3953     {
3954       sigprocmask_count = __bss_count;
3955       sigemptyset (&msdos_pending_signals);
3956       sigemptyset (&current_mask);
3957       for (signo = 0; signo < 320; signo++)
3958         prev_handlers[signo] = SIG_ERR;
3959     }
3960
3961   if (old_set)
3962     *old_set = current_mask;
3963
3964   if (new_set == 0)
3965     return 0;
3966
3967   if (how != SIG_BLOCK && how != SIG_UNBLOCK && how != SIG_SETMASK)
3968     {
3969       errno = EINVAL;
3970       return -1;
3971     }
3972
3973   sigemptyset (&new_mask);
3974
3975   /* DJGPP supports upto 320 signals.  */
3976   for (signo = 0; signo < 320; signo++)
3977     {
3978       if (sigismember (&current_mask, signo))
3979         sigaddset (&new_mask, signo);
3980       else if (sigismember (new_set, signo) && how != SIG_UNBLOCK)
3981         {
3982           sigaddset (&new_mask, signo);
3983
3984           /* SIGKILL is silently ignored, as on other platforms.  */
3985           if (signo != SIGKILL && prev_handlers[signo] == SIG_ERR)
3986             prev_handlers[signo] = signal (signo, sig_suspender);
3987         }
3988       if ((   how == SIG_UNBLOCK
3989               && sigismember (&new_mask, signo)
3990               && sigismember (new_set, signo))
3991           || (how == SIG_SETMASK
3992               && sigismember (&new_mask, signo)
3993               && !sigismember (new_set, signo)))
3994         {
3995           sigdelset (&new_mask, signo);
3996           if (prev_handlers[signo] != SIG_ERR)
3997             {
3998               signal (signo, prev_handlers[signo]);
3999               prev_handlers[signo] = SIG_ERR;
4000             }
4001           if (sigismember (&msdos_pending_signals, signo))
4002             {
4003               sigdelset (&msdos_pending_signals, signo);
4004               raise (signo);
4005             }
4006         }
4007     }
4008   current_mask = new_mask;
4009   return 0;
4010 }
4011
4012 #endif /* not __DJGPP_MINOR__ < 2 */
4013
4014 #ifndef HAVE_SELECT
4015 #include "sysselect.h"
4016
4017 /* This yields the rest of the current time slice to the task manager.
4018    It should be called by any code which knows that it has nothing
4019    useful to do except idle.
4020
4021    I don't use __dpmi_yield here, since versions of library before 2.02
4022    called Int 2Fh/AX=1680h there in a way that would wedge the DOS box
4023    on some versions of Windows 9X.  */
4024
4025 void
4026 dos_yield_time_slice (void)
4027 {
4028   _go32_dpmi_registers r;
4029
4030   r.x.ax = 0x1680;
4031   r.x.ss = r.x.sp = r.x.flags = 0;
4032   _go32_dpmi_simulate_int (0x2f, &r);
4033   if (r.h.al == 0x80)
4034     errno = ENOSYS;
4035 }
4036
4037 /* Only event queue is checked.  */
4038 /* We don't have to call timer_check here
4039    because wait_reading_process_output takes care of that.  */
4040 int
4041 sys_select (int nfds, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds,
4042             struct timespec *timeout, void *ignored)
4043 {
4044   int check_input;
4045   struct timespec t;
4046
4047   check_input = 0;
4048   if (rfds)
4049     {
4050       check_input = FD_ISSET (0, rfds);
4051       FD_ZERO (rfds);
4052     }
4053   if (wfds)
4054     FD_ZERO (wfds);
4055   if (efds)
4056     FD_ZERO (efds);
4057
4058   if (nfds != 1)
4059     emacs_abort ();
4060
4061   /* If we are looking only for the terminal, with no timeout,
4062      just read it and wait -- that's more efficient.  */
4063   if (!timeout)
4064     {
4065       while (!detect_input_pending ())
4066         {
4067           dos_yield_time_slice ();
4068         }
4069     }
4070   else
4071     {
4072       struct timespec clnow, cllast, cldiff;
4073
4074       gettime (&t);
4075       cllast = make_timespec (t.tv_sec, t.tv_nsec);
4076
4077       while (!check_input || !detect_input_pending ())
4078         {
4079           gettime (&t);
4080           clnow = make_timespec (t.tv_sec, t.tv_nsec);
4081           cldiff = timespec_sub (clnow, cllast);
4082           *timeout = timespec_sub (*timeout, cldiff);
4083
4084           /* Stop when timeout value crosses zero.  */
4085           if (timespec_sign (*timeout) <= 0)
4086             return 0;
4087           cllast = clnow;
4088           dos_yield_time_slice ();
4089         }
4090     }
4091
4092   FD_SET (0, rfds);
4093   return 1;
4094 }
4095 #endif
4096
4097 /*
4098  * Define overlaid functions:
4099  *
4100  *      chdir -> sys_chdir
4101  *      tzset -> init_gettimeofday
4102  *      abort -> dos_abort
4103  */
4104
4105 #ifdef chdir
4106 #undef chdir
4107 extern int chdir (const char *);
4108
4109 int
4110 sys_chdir (const char *path)
4111 {
4112   int len = strlen (path);
4113   char *tmp = (char *)path;
4114
4115   if (*tmp && tmp[1] == ':')
4116     {
4117       if (getdisk () != tolower (tmp[0]) - 'a')
4118         setdisk (tolower (tmp[0]) - 'a');
4119       tmp += 2; /* strip drive: KFS 1995-07-06 */
4120       len -= 2;
4121     }
4122
4123   if (len > 1 && (tmp[len - 1] == '/'))
4124     {
4125       char *tmp1 = (char *) alloca (len + 1);
4126       strcpy (tmp1, tmp);
4127       tmp1[len - 1] = 0;
4128       tmp = tmp1;
4129     }
4130   return chdir (tmp);
4131 }
4132 #endif
4133
4134 #ifdef tzset
4135 #undef tzset
4136 extern void tzset (void);
4137
4138 void
4139 init_gettimeofday (void)
4140 {
4141   time_t ltm, gtm;
4142   struct tm *lstm;
4143
4144   tzset ();
4145   ltm = gtm = time (NULL);
4146   ltm = mktime (lstm = localtime (&ltm));
4147   gtm = mktime (gmtime (&gtm));
4148   time_rec.tm_hour = 99;        /* force gettimeofday to get date */
4149   time_rec.tm_isdst = lstm->tm_isdst;
4150   dos_timezone_offset = time_rec.tm_gmtoff = (int)(gtm - ltm) / 60;
4151 }
4152 #endif
4153
4154 static void
4155 msdos_abort (void)
4156 {
4157   dos_ttcooked ();
4158   ScreenSetCursor (10, 0);
4159   cputs ("\r\n\nEmacs aborted!\r\n");
4160 #if __DJGPP__ == 2 && __DJGPP_MINOR__ < 2
4161   if (screen_virtual_segment)
4162     dosv_refresh_virtual_screen (2 * 10 * screen_size_X, 4 * screen_size_X);
4163   /* Generate traceback, so we could tell whodunit.  */
4164   signal (SIGINT, SIG_DFL);
4165   __asm__ __volatile__ ("movb $0x1b,%al;call ___djgpp_hw_exception");
4166 #else  /* __DJGPP_MINOR__ >= 2 */
4167   raise (SIGABRT);
4168 #endif /* __DJGPP_MINOR__ >= 2 */
4169   exit (2);
4170 }
4171
4172 void
4173 msdos_fatal_signal (int sig)
4174 {
4175   if (sig == SIGABRT)
4176     msdos_abort ();
4177   else
4178     raise (sig);
4179 }
4180
4181 void
4182 syms_of_msdos (void)
4183 {
4184   recent_doskeys = Fmake_vector (make_number (NUM_RECENT_DOSKEYS), Qnil);
4185   staticpro (&recent_doskeys);
4186
4187 #ifndef HAVE_X_WINDOWS
4188
4189   /* The following two are from xfns.c:  */
4190   DEFSYM (Qreverse, "reverse");
4191
4192   DEFVAR_LISP ("dos-unsupported-char-glyph", Vdos_unsupported_char_glyph,
4193                doc: /* Glyph to display instead of chars not supported by current codepage.
4194 This variable is used only by MS-DOS terminals.  */);
4195   Vdos_unsupported_char_glyph = make_number ('\177');
4196
4197 #endif
4198
4199   defsubr (&Srecent_doskeys);
4200   defsubr (&Smsdos_long_file_names);
4201   defsubr (&Smsdos_downcase_filename);
4202   defsubr (&Smsdos_remember_default_colors);
4203   defsubr (&Smsdos_set_mouse_buttons);
4204 }
4205
4206 #endif /* MSDOS */