msdos.c 23.6 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
/* MS-DOS specific C utilities.  Coded by Morten Welinder 1993
   Copyright (C) 1993 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Note: some of the stuff here was taken from end of sysdep.c in demacs. */

#include "config.h"

#ifdef MSDOS
#include "lisp.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/time.h>
#include <dos.h>
#include "dosfns.h"
#include "msdos.h"
#include "systime.h"
#include "termhooks.h"
#include "frame.h"
#include <go32.h>
#include <pc.h>
#include <ctype.h>
/* #include <process.h> */
/* Damn that local process.h!  Instead we can define P_WAIT ourselves.  */
#define P_WAIT 1

static int break_stat;	 /* BREAK check mode status.	*/
static int stdin_stat;	 /* stdin IOCTL status.		*/
static int extended_kbd; /* 101 (102) keyboard present.	*/

int have_mouse;          /* Mouse present?		*/
static int mouse_last_x;
static int mouse_last_y;

/*  Turn off Dos' Ctrl-C checking and inhibit interpretation of control chars
    by Dos.  Determine the keyboard type.  */
int
dos_ttraw ()
{
  union REGS inregs, outregs;

  inregs.h.ah = 0xc0;
  int86 (0x15, &inregs, &outregs);
  extended_kbd = (!outregs.x.cflag) && (outregs.h.ah == 0);

  break_stat = getcbrk ();
  setcbrk (0);
  install_ctrl_break_check ();
  have_mouse = Mouse_init1 ();

  inregs.x.ax = 0x4400;	/* Get IOCTL status. */
  inregs.x.bx = 0x00;	/* 0 = stdin. */
  intdos (&inregs, &outregs);
  stdin_stat = outregs.h.dl;

  inregs.x.dx = (outregs.x.dx | 0x0020) & 0x0027; /* raw mode */
  inregs.h.al = 0x01;
  intdos (&inregs, &outregs);
  return !outregs.x.cflag;
}

/*  Restore status of standard input and Ctrl-C checking.  */
int
dos_ttcooked ()
{
  union REGS inregs, outregs;

  setcbrk (break_stat);
  if (have_mouse) Mouse_off ();

  inregs.x.ax = 0x4401;	/* Set IOCTL status.	*/
  inregs.x.bx = 0x00;	/* 0 = stdin.		*/
  inregs.x.dx = stdin_stat;
  intdos (&inregs, &outregs);
  return !outregs.x.cflag;
}

static unsigned short
ibmpc_translate_map[] =
{
  /* --------------- 00 to 0f --------------- */
  0, /* Ctrl Break */
  0xff1b, /* Escape */
  0xffb1, /* Keypad 1 */
  0xffb2, /* Keypad 2 */
  0xffb3, /* Keypad 3 */
  0xffb4, /* Keypad 4 */
  0xffb5, /* Keypad 5 */
  0xffb6, /* Keypad 6 */
  0xffb7, /* Keypad 7 */
  0xffb8, /* Keypad 8 */
  0xffb9, /* Keypad 9 */
  0xffb0, /* Keypad 0 */
  '-', '=',
  0xff08, /* Backspace */
  0xff74, /* (Shift) Tab [Tab doesn't use this table] */

  /* --------------- 10 to 1f --------------- */
  'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']',
  0xff8d, /* Keypad Enter */
  0, /* Ctrl */
  'a', 's',

  /* --------------- 20 to 2f --------------- */
  'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`',
  0, /* Left shift */
  '\\', 'z', 'x', 'c', 'v',

  /* --------------- 30 to 3f --------------- */
  'b', 'n', 'm', ',', '.',
  0xffaf, /* Grey / */
  0, /* Right shift */
  0xffaa, /* Grey * */
  0, /* Alt */
  ' ',
  0, /* Caps Lock */
  0xffbe, /* F1 */
  0xffbf, /* F2 */
  0xffc0, /* F3 */
  0xffc1, /* F4 */
  0xffc2, /* F5 */

  /* --------------- 40 to 4f --------------- */
  0xffc3, /* F6 */
  0xffc4, /* F7 */
  0xffc5, /* F8 */
  0xffc6, /* F9 */
  0xffc7, /* F10 */
  0, /* Num Lock */
  0, /* Scroll Lock */
  0xff50, /* Home */
  0xff52, /* Up */
  0xff55, /* Page Up */
  0xffad, /* Grey - */
  0xff51, /* Left */
  0xffb5, /* Keypad 5 */
  0xff53, /* Right */
  0xffab, /* Grey + */
  0xff57, /* End */

  /* --------------- 50 to 5f --------------- */
  0xff54, /* Down */
  0xff56, /* Page Down */
  0xff63, /* Insert */
  0xffff, /* Delete */
  0xffbe, /* (Shift) F1 */
  0xffbf, /* (Shift) F2 */
  0xffc0, /* (Shift) F3 */
  0xffc1, /* (Shift) F4 */
  0xffc2, /* (Shift) F5 */
  0xffc3, /* (Shift) F6 */
  0xffc4, /* (Shift) F7 */
  0xffc5, /* (Shift) F8 */
  0xffc6, /* (Shift) F9 */
  0xffc7, /* (Shift) F10 */
  0xffbe, /* (Ctrl) F1 */
  0xffbf, /* (Ctrl) F2 */

  /* --------------- 60 to 6f --------------- */
  0xffc0, /* (Ctrl) F3 */
  0xffc1, /* (Ctrl) F4 */
  0xffc2, /* (Ctrl) F5 */
  0xffc3, /* (Ctrl) F6 */
  0xffc4, /* (Ctrl) F7 */
  0xffc5, /* (Ctrl) F8 */
  0xffc6, /* (Ctrl) F9 */
  0xffc7, /* (Ctrl) F10 */
  0xffbe, /* (Alt) F1 */
  0xffbf, /* (Alt) F2 */
  0xffc0, /* (Alt) F3 */
  0xffc1, /* (Alt) F4 */
  0xffc2, /* (Alt) F5 */
  0xffc3, /* (Alt) F6 */
  0xffc4, /* (Alt) F7 */
  0xffc5, /* (Alt) F8 */

  /* --------------- 70 to 7f --------------- */
  0xffc6, /* (Alt) F9 */
  0xffc7, /* (Alt) F10 */
  0xff6d, /* (Ctrl) Sys Rq */
  0xff51, /* (Ctrl) Left */
  0xff53, /* (Ctrl) Right */
  0xff57, /* (Ctrl) End */
  0xff56, /* (Ctrl) Page Down */
  0xff50, /* (Ctrl) Home */
  '1', '2', '3', '4', '5', '6', '7', '8', /* (Alt) */

  /* --------------- 80 to 8f --------------- */
  '9', '0', '-', '=', /* (Alt) */
  0xff55, /* (Ctrl) Page Up */
  0xffc8, /* F11 */
  0xffc9, /* F12 */
  0xffc8, /* (Shift) F11 */
  0xffc9, /* (Shift) F12 */
  0xffc8, /* (Ctrl) F11 */
  0xffc9, /* (Ctrl) F12 */
  0xffc8, /* (Alt) F11 */
  0xffc9, /* (Alt) F12 */
  0xff52, /* (Ctrl) Up */
  0xffae, /* (Ctrl) Grey - */
  0xffb5, /* (Ctrl) Keypad 5 */

  /* --------------- 90 to 9f --------------- */
  0xffab, /* (Ctrl) Grey + */
  0xff54, /* (Ctrl) Down */
  0xff63, /* (Ctrl) Insert */
  0xffff, /* (Ctrl) Delete */
  0xff09, /* (Ctrl) Tab */
  0xffaf, /* (Ctrl) Grey / */
  0xffaa, /* (Ctrl) Grey * */
  0xff50, /* (Alt) Home */
  0xff52, /* (Alt) Up */
  0xff55, /* (Alt) Page Up */
  0, /* NO KEY */
  0xff51, /* (Alt) Left */
  0, /* NO KEY */
  0xff53, /* (Alt) Right */
  0, /* NO KEY */
  0xff57, /* (Alt) End */

  /* --------------- a0 to af --------------- */
  0xff54, /* (Alt) Down */
  0xff56, /* (Alt) Page Down */
  0xff63, /* (Alt) Insert */
  0xffff, /* (Alt) Delete */
  0xffaf, /* (Alt) Grey / */
  0xff09, /* (Alt) Tab */
  0xff0d  /* (Alt) Enter */
};

/* Get a char from keyboard.  Function keys are put into the event queue.  */
static int
dos_rawgetc ()
{
  struct input_event event;
  struct timeval tv;
  union REGS regs;
  int ctrl_p, alt_p, shift_p;

  /* Calculate modifier bits */
  regs.h.ah = extended_kbd ? 0x12 : 0x02;
  int86 (0x16, &regs, &regs);
  ctrl_p = ((regs.h.al & 4) != 0);
  shift_p = ((regs.h.al & 3) != 0);
  alt_p = ((extended_kbd ? (regs.h.ah & 2) : (regs.h.al & 8)) != 0);

  while (kbhit ())
    {
      union REGS regs;
      register unsigned char c;
      int sc, code;

      regs.h.ah = extended_kbd ? 0x10 : 0x00;
      int86 (0x16, &regs, &regs);
      c = regs.h.al;
      sc = regs.h.ah;

      /* Determine from the scan code if a keypad key was pressed.  */
      if (c >= '0' && c <= '9' && sc > 0xb)
	sc = (c == '0') ? 0xb : (c - '0' + 1), c = 0;
      else if (sc == 0xe0)
	{
	  switch (c)
	    {
	    case 10: /* Ctrl Enter */
	    case 13:
	      sc = 0x1c;
	      break;
	    case '.': /* Decimal point or decimal comma */
	    case ',':
	      sc = 0x53;
	      break;
	    case '/':
	      sc = 0x35;
	      break;
	    default:
	      sc = 0;
	    };
	  c = 0;
	}

      if (c == 0
	  || c == ' '
	  || alt_p
	  || (ctrl_p && shift_p)
	  || (c == 0xe0 && sc != 0)     /* Pseudo-key */
	  || sc == 0x37                 /* Grey * */
	  || sc == 0x4a                 /* Grey - */
	  || sc == 0x4e                 /* Grey + */
	  || sc == 0x0e)                /* Back space *key*, not Ctrl-h */
      {
	if (sc >= (sizeof (ibmpc_translate_map) / sizeof (short)))
	  code = 0;
	else
	  code = ibmpc_translate_map[sc];
	if (code != 0)
	  {
	    if (code >= 0x100)
	      {
		event.kind = non_ascii_keystroke;
		event.code = code & 0xff;
	      }
	    else
	      {
		/* Don't return S- if we don't have to.  */
		if (code >= 'a' && code <= 'z')
		  {
		    c = shift_p ? toupper (code) : code;
		    shift_p = 0;
		  }
		else
		  if (c == 0) c = code;
		event.kind = ascii_keystroke;
		event.code = c;
	      }
	    event.modifiers
	      = (shift_p ? shift_modifier : 0)
		+ (ctrl_p ? ctrl_modifier : 0)
		  + (alt_p ? meta_modifier : 0);
	    /* EMACS == Enter Meta Alt Control Shift */
	    event.frame_or_window = selected_frame;
	    gettimeofday (&tv, NULL);
	    event.timestamp = tv.tv_usec;
	    kbd_buffer_store_event (&event);
	  }
      } else
	return c;
    }

  if (have_mouse)
    {
      int but, press, x, y, ok;

      /* Check for mouse movement *before* buttons.  */
      Mouse_check_moved ();

      for (but = 0; but < NUM_MOUSE_BUTTONS; but++)
	for (press = 0; press < 2; press++)
	  {
	    if (press)
	      ok = Mouse_pressed (but, &x, &y);
	    else
	      ok = Mouse_released (but, &x, &y);
	    if (ok)
	      {
		event.kind = mouse_click;
		event.code = but;
		event.modifiers
		  = (shift_p ? shift_modifier : 0)
		    + (ctrl_p ? ctrl_modifier : 0)
		      + (alt_p ? meta_modifier : 0)
			+ (press ? down_modifier : up_modifier);
		event.x = x;
		event.y = y;
		event.frame_or_window = selected_frame;
		gettimeofday (&tv, NULL);
		event.timestamp = tv.tv_usec;
		kbd_buffer_store_event (&event);
	      }
	  }
    }

  return -1;
}

static int prev_get_char = -1;

/* Return 1 if a key is ready to be read without suspending execution.  */
dos_keysns ()
{
  if (prev_get_char != -1)
    return 1;
  else
    return ((prev_get_char = dos_rawgetc ()) != -1);
}

/* Read a key.  Return -1 if no key is ready.  */
dos_keyread ()
{
  if (prev_get_char != -1)
    {
      int c = prev_get_char;
      prev_get_char = -1;
      return c;
    }
  else
    return dos_rawgetc ();
}

/* Hostnames for a pc are not really funny, but they are used in change log
   so we emulate the best we can.  */
gethostname (p, size)
     char *p;
     int size;
{
  char *q = egetenv ("HOSTNAME");

  if (!q) q = "pc";
  strcpy (p, q);
  return 0;
}

/* Destructively turn backslashes into slashes.  */
void
dostounix_filename (p)
     register char *p;
{
  while (*p)
    {
      if (*p == '\\')
	*p = '/';
      p++;
    }
}

/* Destructively turn slashes into backslashes.  */
void
unixtodos_filename (p)
     register char *p;
{
  while (*p)
    {
      if (*p == '/')
	*p = '\\';
      p++;
    }
}

/* Get the default directory for a given drive.  0=def, 1=A, 2=B, ...  */
int
getdefdir (drive, dst)
     int drive;
     char *dst;
{
  union REGS regs;

  *dst++ = '/';
  regs.h.dl = drive;
  regs.x.si = (int) dst;
  regs.h.ah = 0x47;
  intdos (&regs, &regs);
  return !regs.x.cflag;
}

/* Remove all CR's that are followed by a LF.  */
int
crlf_to_lf (n, buf)
     register int n;
     register unsigned char *buf;
{
  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;
  unsigned char c;

  if (n == 0)
    return n;
  while (buf < endp)
    {
      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
    }
  return np - startp;
}


/* Run command as specified by ARGV in directory DIR.
   The command is run with input from TEMPIN and output to file TEMPOUT.  */
int
run_msdos_command (argv, dir, tempin, tempout)
     unsigned char **argv;
     Lisp_Object dir;
     int tempin, tempout;
{
  char *saveargv1, *saveargv2, **envv;
  char oldwd[MAXPATHLEN + 1]; /* Fixed size is safe on MSDOS.  */
  int msshell, result = -1;
  int in, out, inbak, outbak, errbak;
  Lisp_Object cmd;

  /* Get current directory as MSDOS cwd is not per-process.  */
  getwd (oldwd);

  cmd = Ffile_name_nondirectory (build_string (argv[0]));
  msshell = !NILP (Fmember (cmd, Fsymbol_value (intern ("msdos-shells"))))
    && !strcmp ("-c", argv[1]);
  if (msshell)
    {
      saveargv1 = argv[1];
      argv[1] = "/c";
      if (argv[2])
	{
	  saveargv2 = argv[2];
	  unixtodos_filename (argv[2] = strdup (argv[2]));
	}
    }

  /* Build the environment array.  */
  {
    extern Lisp_Object Vprocess_environment;
    Lisp_Object tmp, lst = Vprocess_environment;
    int i, len = XFASTINT (Flength (lst));

    envv = alloca ((len + 1) * sizeof (char *));
    for (i = 0; i < len; i++)
      {
	tmp = Fcar (lst);
	lst = Fcdr (lst);
	CHECK_STRING (tmp, 0);
	envv[i] = alloca (XSTRING (tmp)->size + 1);
	strcpy (envv[i], XSTRING (tmp)->data);
      }
    envv[len] = (char *) 0;
  }

  if (XTYPE (dir) == Lisp_String)
    chdir (XSTRING (dir)->data);
  inbak = dup (0);
  outbak = dup (1);
  errbak = dup (2);
  if (inbak < 0 || outbak < 0 || errbak < 0)
    goto done; /* Allocation might fail due to lack of descriptors.  */
  dup2 (tempin, 0);
  dup2 (tempout, 1);
  dup2 (tempout, 2);
  dos_ttcooked ();
  result = spawnve (P_WAIT, argv[0], argv, envv);
  dos_ttraw ();
  dup2 (inbak, 0);
  dup2 (outbak, 1);
  dup2 (errbak, 2);

 done:
  chdir (oldwd);
  if (msshell)
    {
      argv[1] = saveargv1;
      if (argv[2])
	{
	  free (argv[2]);
	  argv[2] = saveargv2;
	}
    }
  return result;
}


croak (badfunc)
     char *badfunc;
{
  fprintf (stderr, "%s not yet implemented\r\n", badfunc);
  reset_sys_modes ();
  exit (1);
}

/* A list of unimplemented functions that we silently ignore.  */
unsigned alarm (s) unsigned s; {}
fork () { return 0; }
int kill (x, y) int x, y; { return -1; }
nice (p) int p; {}
void volatile pause () {}
request_sigio () {}
setpgrp () {return 0; }
setpriority (x,y,z) int x,y,z; { return 0; }
sigsetmask (x) int x; { return 0; }
unrequest_sigio () {}

#ifdef chdir
#undef chdir
#endif

int
sys_chdir (path)
     const char* path;
{
  int len = strlen (path);
  char *tmp = (char *) alloca (len + 1);
  /* Gotta do this extern here due to the corresponding #define: */
  extern int chdir ();

  if (*path && path[1] == ':' && (getdisk () != tolower (path[0]) - 'a'))
    setdisk (tolower (path[0]) - 'a');

  strcpy (tmp, path);
  if (strcmp (path, "/") && strcmp (path + 1, ":/") && (path[len - 1] == '/'))
    tmp[len - 1] = 0;
  return chdir (tmp);
}

/* Sleep SECS.  If KBDOK also return immediately if a key is pressed.  */
void
sleep_or_kbd_hit (secs, kbdok)
     int secs, kbdok;
{
  long clnow, clthen;
  struct timeval t;

  gettimeofday (&t, NULL);
  clnow = t.tv_sec * 100 + t.tv_usec / 10000;
  clthen = clnow + (100 * secs);

  do
    {
      gettimeofday (&t, NULL);
      clnow = t.tv_sec * 100 + t.tv_usec / 10000;
      if (kbdok && detect_input_pending ())
	return;
    }
  while (clnow < clthen);
}

/* Define a lot of environment variables if not already defined.  Don't
   remove anything unless you know what you're doing -- lots of code will
   break if one or more of these are missing.  */
void
init_environment (argc, argv, skip_args)
     int argc;
     char **argv;
     int skip_args;
{
  char *s, *t;

  /* We default HOME to the directory from which Emacs was started, but with
     a "/bin" suffix removed.  */
  s = argv[0];
  t = alloca (strlen (s) + 1);
  strcpy (t, s);
  s = t + strlen (t);
  while (s != t && *s != '/' && *s != ':') s--;
  if (s == t)
    t = "c:/emacs"; /* When run under debug32.  */
  else
    {
      if (*s == ':') s++;
      *s = 0;
      if (s - 4 >= t && strcmp (s - 4, "/bin") == 0)
	s[strlen (s) - 4] = 0;
    }
  setenv ("HOME", t, 0);

  /* We set EMACSPATH to ~/bin (expanded) */
  s = getenv ("HOME");
  t = strcpy (alloca (strlen (s) + 6), s);
  if (s[strlen (s) - 1] != '/') strcat (t, "/");
  strcat (t, "bin");
  setenv ("EMACSPATH", t, 0);

  /* I don't expect anybody to ever use other terminals so the internal
     terminal is the default.  */
  setenv ("TERM", "internal", 0);

  /* SHELL is a bit tricky -- COMSPEC is the closest we come, but we must
     downcase it and mirror the backslashes.  */
  s = getenv ("COMSPEC");
  if (!s) s = "c:/command.com";
  t = alloca (strlen (s) + 1);
  strcpy (t, s);
  strlwr (t);
  dostounix_filename (t);
  setenv ("SHELL", t, 0);

  /* PATH is also downcased and backslashes mirrored.  */
  s = getenv ("PATH");
  if (!s) s = "";
  t = alloca (strlen (s) + 3);
  /* Current directory is always considered part of MsDos's path but it is
     not normally mentioned.  Now it is.  */
  strcat (strcpy (t, ".;"), s);
  strlwr (t);
  dostounix_filename (t); /* Not a single file name, but this should work.  */
  setenv ("PATH", t, 1);

  /* In some sense all dos users have root privileges, so...  */
  setenv ("USER", "root", 0);
  setenv ("NAME", getenv ("USER"), 0);

  /* Time zone determined from country code.  To make this possible, the
     country code may not span more than one time zone.  In other words,
     in the USA, you lose.  */
  switch (dos_country_code)
    {
    case 31: /* Belgium */
    case 32: /* The Netherlands */
    case 33: /* France */
    case 34: /* Spain */
    case 36: /* Hungary */
    case 38: /* Yugoslavia (or what's left of it?) */
    case 39: /* Italy */
    case 41: /* Switzerland */
    case 42: /* Tjekia */
    case 45: /* Denmark */
    case 46: /* Sweden */
    case 47: /* Norway */
    case 48: /* Poland */
    case 49: /* Germany */
      /* Daylight saving from last Sunday in March to last Sunday in
	 September, both at 2AM.  */
      setenv ("TZ", "MET-01METDST-02,M3.5.0/02:00,M9.5.0/02:00", 0);
      break;
    case 44: /* United Kingdom */
    case 351: /* Portugal */
    case 354: /* Iceland */
      setenv ("TZ", "GMT+00", 0);
      break;
    case 81: /* Japan */
    case 82: /* Korea */
      setenv ("TZ", "???-09", 0);
      break;
    case 90: /* Turkey */
    case 358: /* Finland */
    case 972: /* Israel */
      setenv ("TZ", "EET-02", 0);
      break;
    }
  tzset ();
}

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

static unsigned char _xorattr;

void
visible_bell (xorattr)
     unsigned char xorattr;
{
  _xorattr = xorattr;
  asm ("  pushl  %eax
	  pushl  %ebx
	  pushl  %ecx
	  pushl  %edx
	  movl   $1,%edx
visible_bell_0:
	  movl   _ScreenPrimary,%eax
	  call   dosmemsetup
	  movl   %eax,%ebx
	  call   _ScreenRows
	  movl   %eax,%ecx
	  call   _ScreenCols
	  imull  %eax,%ecx
	  movb   (__xorattr),%al
	  incl   %ebx
visible_bell_1:
	  xorb   %al,%gs:(%ebx)
	  addl   $2,%ebx
	  decl   %ecx
	  jne    visible_bell_1
	  decl   %edx
	  jne    visible_bell_3
visible_bell_2:
	  movzwl %ax,%eax
          movzwl %ax,%eax
	  movzwl %ax,%eax
	  movzwl %ax,%eax
	  decw   %cx
	  jne    visible_bell_2
	  jmp    visible_bell_0
visible_bell_3:
	  popl  %edx
	  popl  %ecx
	  popl  %ebx
	  popl  %eax");
}

static int internal_terminal = 0;
#undef fflush

int
internal_flush (f)
     FILE *f;
{
  static int x;
  static int y;
  char c, *cp;
  int count, i;

  if (internal_terminal && f == stdout)
    {
      if (have_mouse) Mouse_off ();
      cp = stdout->_base;
      count = stdout->_ptr - stdout->_base;
      while (count > 0)
	{
	  switch (c = *cp++)
	    {
	    case 27:
	      switch (*cp++)
		{
		case '@':
		  y = *cp++;
		  x = *cp++;
		  count -= 4;
		  break;
		case 'A':
		  ScreenAttrib = *cp++;
		  count -= 3;
		  break;
		case 'B':
		  visible_bell (*cp++);
		  count -= 3;
		  break;
		case 'C':
		  ScreenClear ();
		  x = y = 0;
		  count -= 2;
		  break;
		case 'E':
		  for (i = ScreenCols () - 1; i >= x; i--)
		    ScreenPutChar (' ', ScreenAttrib, i, y);
		  count -= 2;
		  break;
		case 'R':
		  x++;
		  count -= 2;
		  break;
		case 'U':
		  y--;
		  count -= 2;
		  break;
		case 'X':
		  ScreenAttrib ^= *cp++;
		  count -= 3;
		  break;
		default:
		  count -= 2;
		}
	      break;
	    case 8:
	      x--;
	      count--;
	      break;
	    case 13:
	      x = 0;
	      count--;
	      break;
	    case 10:
	      y++;
	      count--;
	      break;
	    default:
	      ScreenPutChar (c, ScreenAttrib, x++, y);
	      count--;
	    }
	}
      fpurge (stdout);
      ScreenSetCursor (y, x);
      if (have_mouse) Mouse_on ();
    }
  else
    /* This is a call to the original fflush.  */
    fflush (f);
}

/* Do we need the internal terminal? */
void
internal_terminal_init ()
{
  char *term = getenv ("TERM");

  internal_terminal
    = (!noninteractive) && term && !strcmp (term, "internal");
}

/* These must be global.  */
static _go32_dpmi_seginfo ctrl_break_vector;
static _go32_dpmi_registers ctrl_break_regs;
static int ctrlbreakinstalled = 0;

/* Interrupt level detection of Ctrl-Break.  Don't do anything fancy here!  */
void
ctrl_break_func (regs)
     _go32_dpmi_registers *regs;
{
  Vquit_flag = Qt;
}

void
install_ctrl_break_check ()
{
  if (!ctrlbreakinstalled)
    {
      /* Don't press Ctrl-Break if you don't have either DPMI or Emacs
	 was compiler with Djgpp 1.11 maintenance level 2 or later!  */
      ctrlbreakinstalled = 1;
      ctrl_break_vector.pm_offset = (int) ctrl_break_func;
      _go32_dpmi_allocate_real_mode_callback_iret (&ctrl_break_vector,
						   &ctrl_break_regs);
      _go32_dpmi_set_real_mode_interrupt_vector (0x1b, &ctrl_break_vector);
    }
}


/* Mouse routines under devellopment follow.  Coordinates are in screen
   positions and zero based.  Mouse buttons are numbered from left to 
   right and also zero based.  */

static int mouse_button_translate[NUM_MOUSE_BUTTONS];
static int mouse_button_count;

void
mouse_init ()
{
  union REGS regs;

  regs.x.ax = 0x0007;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenCols () - 1);
  int86 (0x33, &regs, &regs);

  regs.x.ax = 0x0008;
  regs.x.cx = 0;
  regs.x.dx = 8 * (ScreenRows () - 1);
  int86 (0x33, &regs, &regs);

  mouse_moveto (ScreenCols () - 1, ScreenRows () - 1);
  mouse_on ();
}

void
mouse_on ()
{
  union REGS regs;

  regs.x.ax = 0x0001;
  int86 (0x33, &regs, &regs);
}

void
mouse_off ()
{
  union REGS regs;

  regs.x.ax = 0x0002;
  int86 (0x33, &regs, &regs);
}

void
mouse_moveto (x, y)
     int x, y;
{
  union REGS regs;

  regs.x.ax = 0x0004;
  mouse_last_x = regs.x.cx = x * 8;
  mouse_last_y = regs.x.dx = y * 8;
  int86 (0x33, &regs, &regs);
}

int
mouse_pressed (b, xp, yp)
     int b, *xp, *yp;
{
  union REGS regs;

  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 0x0005;
  regs.x.bx = mouse_button_translate[b];
  int86 (0x33, &regs, &regs);
  if (regs.x.bx)
    *xp = regs.x.cx / 8, *yp = regs.x.dx /8;
  return (regs.x.bx != 0);
}

int
mouse_released (b, xp, yp)
     int b, *xp, *yp;
{
  union REGS regs;

  if (b >= mouse_button_count)
    return 0;
  regs.x.ax = 0x0006;
  regs.x.bx = mouse_button_translate[b];
  int86 (0x33, &regs, &regs);
  if (regs.x.bx)
    *xp = regs.x.cx / 8, *yp = regs.x.dx / 8;
  return (regs.x.bx != 0);
}

void
mouse_get_pos (f, bar_window, part, x, y, time)
     FRAME_PTR *f;
     Lisp_Object *bar_window, *x, *y;
     enum scroll_bar_part *part;
     unsigned long *time;
{
  union REGS regs;
  struct timeval tv;

  regs.x.ax = 0x0003;
  int86 (0x33, &regs, &regs);
  *f = selected_frame;
  *bar_window = Qnil;
  gettimeofday (&tv, NULL);
  *x = make_number (regs.x.cx / 8);
  *y = make_number (regs.x.dx / 8);
  *time = tv.tv_usec;
  mouse_moved = 0;
}

void
mouse_check_moved ()
{
  union REGS regs;

  regs.x.ax = 0x0003;
  int86 (0x33, &regs, &regs);
  if (regs.x.cx != mouse_last_x || regs.x.dx != mouse_last_y)
    {
      mouse_moved = 1;
      mouse_last_x = regs.x.cx;
      mouse_last_y = regs.x.dx;
    }
}

int
mouse_init1 ()
{
  union REGS regs;
  int present;

  regs.x.ax = 0x0021;
  int86 (0x33, &regs, &regs);
  present = internal_terminal && (regs.x.ax & 0xffff) == 0xffff;
  if (present)
    {
      if (regs.x.bx == 3)
	{
	  mouse_button_count = 3;
	  mouse_button_translate[0] = 0; /* Left */
	  mouse_button_translate[1] = 2; /* Middle */
	  mouse_button_translate[2] = 1; /* Right */
	}
      else
	{
	  mouse_button_count = 2;
	  mouse_button_translate[0] = 0;
	  mouse_button_translate[1] = 1;
	}
      mouse_position_hook = &mouse_get_pos;
      mouse_init ();
   }
  return present;
}

#endif /* MSDOS */