src/dosfns.c

   1 /* MS-DOS specific Lisp utilities.  Coded by Manabu Higashida, 1991.
   2    Major changes May-July 1993 Morten Welinder (only 10% original code left)
   3    Copyright (C) 1991, 1993, 1996-1998, 2001-2012 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 #include <config.h>
  21
  22 #ifdef MSDOS
  23 /* The entire file is within this conditional */
  24
  25 #include <stdio.h>
  26 #include <dos.h>
  27 #include <setjmp.h>
  28 #include "lisp.h"
  29 #include "buffer.h"
  30 #include "termchar.h"
  31 #include "frame.h"
  32 #include "termhooks.h"
  33 #include "blockinput.h"
  34 #include "window.h"
  35 #include "dosfns.h"
  36 #include "msdos.h"
  37 #include "dispextern.h"
  38 #include "character.h"
  39 #include "coding.h"
  40 #include "process.h"
  41 #include <dpmi.h>
  42 #include <go32.h>
  43 #include <dirent.h>
  44 #include <sys/vfs.h>
  45 #include <unistd.h>
  46 #include <grp.h>
  47 #include <crt0.h>
  48
  49 DEFUN ("int86", Fint86, Sint86, 2, 2, 0,
  50        doc: /* Call specific MS-DOS interrupt number INTERRUPT with REGISTERS.
  51 Return the updated REGISTER vector.
  52
  53 INTERRUPT should be an integer in the range 0 to 255.
  54 REGISTERS should be a vector produced by `make-register' and
  55 `set-register-value'.  */)
  56   (Lisp_Object interrupt, Lisp_Object registers)
  57 {
  58   register int i;
  59   int no;
  60   union REGS inregs, outregs;
  61
  62   CHECK_NUMBER (interrupt);
  63   no = (unsigned long) XINT (interrupt);
  64   CHECK_VECTOR (registers);
  65   if (no < 0 || no > 0xff || ASIZE (registers) != 8)
  66     return Qnil;
  67   for (i = 0; i < 8; i++)
  68     CHECK_NUMBER (XVECTOR (registers)->contents[i]);
  69
  70   inregs.x.ax    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[0]);
  71   inregs.x.bx    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[1]);
  72   inregs.x.cx    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[2]);
  73   inregs.x.dx    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[3]);
  74   inregs.x.si    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[4]);
  75   inregs.x.di    = (unsigned long) XFASTINT (XVECTOR (registers)->contents[5]);
  76   inregs.x.cflag = (unsigned long) XFASTINT (XVECTOR (registers)->contents[6]);
  77   inregs.x.flags = (unsigned long) XFASTINT (XVECTOR (registers)->contents[7]);
  78
  79   int86 (no, &inregs, &outregs);
  80
  81   XVECTOR (registers)->contents[0] = make_number (outregs.x.ax);
  82   XVECTOR (registers)->contents[1] = make_number (outregs.x.bx);
  83   XVECTOR (registers)->contents[2] = make_number (outregs.x.cx);
  84   XVECTOR (registers)->contents[3] = make_number (outregs.x.dx);
  85   XVECTOR (registers)->contents[4] = make_number (outregs.x.si);
  86   XVECTOR (registers)->contents[5] = make_number (outregs.x.di);
  87   XVECTOR (registers)->contents[6] = make_number (outregs.x.cflag);
  88   XVECTOR (registers)->contents[7] = make_number (outregs.x.flags);
  89
  90   return registers;
  91 }
  92
  93 DEFUN ("msdos-memget", Fdos_memget, Sdos_memget, 2, 2, 0,
  94        doc: /* Read DOS memory at offset ADDRESS into VECTOR.
  95 Return the updated VECTOR.  */)
  96   (Lisp_Object address, Lisp_Object vector)
  97 {
  98   register int i;
  99   int offs, len;
 100   char *buf;
 101
 102   CHECK_NUMBER (address);
 103   offs = (unsigned long) XINT (address);
 104   CHECK_VECTOR (vector);
 105   len = ASIZE (vector);
 106   if (len < 1 || len > 2048 || offs < 0 || offs > 0xfffff - len)
 107     return Qnil;
 108   buf = alloca (len);
 109   dosmemget (offs, len, buf);
 110
 111   for (i = 0; i < len; i++)
 112     XVECTOR (vector)->contents[i] = make_number (buf[i]);
 113
 114   return vector;
 115 }
 116
 117 DEFUN ("msdos-memput", Fdos_memput, Sdos_memput, 2, 2, 0,
 118        doc: /* Write DOS memory at offset ADDRESS from VECTOR.  */)
 119   (Lisp_Object address, Lisp_Object vector)
 120 {
 121   register int i;
 122   int offs, len;
 123   char *buf;
 124
 125   CHECK_NUMBER (address);
 126   offs = (unsigned long) XINT (address);
 127   CHECK_VECTOR (vector);
 128   len = ASIZE (vector);
 129   if (len < 1 || len > 2048 || offs < 0 || offs > 0xfffff - len)
 130     return Qnil;
 131   buf = alloca (len);
 132
 133   for (i = 0; i < len; i++)
 134     {
 135       CHECK_NUMBER (XVECTOR (vector)->contents[i]);
 136       buf[i] = (unsigned char) XFASTINT (XVECTOR (vector)->contents[i]) & 0xFF;
 137     }
 138
 139   dosmemput (buf, len, offs);
 140   return Qt;
 141 }
 142
 143 DEFUN ("msdos-set-keyboard", Fmsdos_set_keyboard, Smsdos_set_keyboard, 1, 2, 0,
 144        doc: /* Set keyboard layout according to COUNTRY-CODE.
 145 If the optional argument ALLKEYS is non-nil, the keyboard is mapped for
 146 all keys; otherwise it is only used when the ALT key is pressed.
 147 The current keyboard layout is available in dos-keyboard-code.  */)
 148   (Lisp_Object country_code, Lisp_Object allkeys)
 149 {
 150   CHECK_NUMBER (country_code);
 151   if (!dos_set_keyboard (XINT (country_code), !NILP (allkeys)))
 152     return Qnil;
 153   return Qt;
 154 }
 155
 156 #ifndef HAVE_X_WINDOWS
 157 /* Later we might want to control the mouse interface with this function,
 158    e.g., with respect to non-80 column screen modes.  */
 159
 160 DEFUN ("msdos-mouse-p", Fmsdos_mouse_p, Smsdos_mouse_p, 0, 0, 0,
 161        doc: /* Report whether a mouse is present.  */)
 162   (void)
 163 {
 164   if (have_mouse)
 165     return Qt;
 166   else
 167     return Qnil;
 168 }
 169 #endif
 170
 171 DEFUN ("msdos-mouse-init", Fmsdos_mouse_init, Smsdos_mouse_init, 0, 0, "",
 172        doc: /* Initialize and enable mouse if available.  */)
 173   (void)
 174 {
 175   if (have_mouse)
 176     {
 177       have_mouse = 1;
 178       mouse_init ();
 179       return Qt;
 180     }
 181   return Qnil;
 182 }
 183
 184 DEFUN ("msdos-mouse-enable", Fmsdos_mouse_enable, Smsdos_mouse_enable, 0, 0, "",
 185        doc: /* Enable mouse if available.  */)
 186   (void)
 187 {
 188   if (have_mouse)
 189     {
 190       have_mouse = 1;
 191       mouse_on ();
 192     }
 193   return have_mouse ? Qt : Qnil;
 194 }
 195
 196 DEFUN ("msdos-mouse-disable", Fmsdos_mouse_disable, Smsdos_mouse_disable, 0, 0, "",
 197        doc: /* Disable mouse if available.  */)
 198   (void)
 199 {
 200   mouse_off ();
 201   if (have_mouse) have_mouse = -1;
 202   return Qnil;
 203 }
 204
 205 DEFUN ("insert-startup-screen", Finsert_startup_screen, Sinsert_startup_screen, 0, 0, "",
 206        doc: /* Insert copy of screen contents prior to starting Emacs.
 207 Return nil if startup screen is not available.  */)
 208   (void)
 209 {
 210   char *s;
 211   int rows, cols, i, j;
 212
 213   if (!dos_get_saved_screen (&s, &rows, &cols))
 214     return Qnil;
 215
 216   for (i = 0; i < rows; i++)
 217     {
 218       for (j = 0; j < cols; j++)
 219         {
 220           insert_char (*s);
 221           s += 2;
 222         }
 223       insert_char ('\n');
 224     }
 225
 226   return Qt;
 227 }
 228 \f
 229 unsigned char dos_country_info[DOS_COUNTRY_INFO];
 230 static unsigned char usa_country_info[DOS_COUNTRY_INFO] = {
 231   0, 0,                         /* date format */
 232   '$', 0, 0, 0, 0,              /* currency string */
 233   ',', 0,                       /* thousands separator */
 234   '.', 0,                       /* decimal separator */
 235   '/', 0,                       /* date separator */
 236   ':', 0,                       /* time separator */
 237   0,                            /* currency format */
 238   2,                            /* digits after decimal in currency */
 239   0,                            /* time format */
 240   0, 0, 0, 0,                   /* address of case map routine, GPF if used */
 241   ' ', 0,                       /* data-list separator (?) */
 242   0, 0, 0, 0, 0, 0, 0, 0, 0, 0  /* reserved */
 243 };
 244
 245 #ifndef HAVE_X_WINDOWS
 246 static unsigned dos_windows_version;
 247 char parent_vm_title[50];       /* Ralf Brown says 30 is enough */
 248 int w95_set_virtual_machine_title (const char *);
 249
 250 void
 251 restore_parent_vm_title (void)
 252 {
 253   if (NILP (Vdos_windows_version))
 254     return;
 255   if ((dos_windows_version & 0xff) >= 4 && parent_vm_title[0])
 256     w95_set_virtual_machine_title (parent_vm_title);
 257   delay (50);
 258 }
 259 #endif /* !HAVE_X_WINDOWS */
 260
 261 void
 262 init_dosfns (void)
 263 {
 264   union REGS regs;
 265   _go32_dpmi_registers dpmiregs;
 266   unsigned long xbuf = _go32_info_block.linear_address_of_transfer_buffer;
 267
 268 #ifndef SYSTEM_MALLOC
 269   extern void get_lim_data (void);
 270
 271   get_lim_data (); /* why the hell isn't this called elsewhere? */
 272 #endif
 273
 274   regs.x.ax = 0x3000;
 275   intdos (&regs, &regs);
 276   Vdos_version = Fcons (make_number (regs.h.al), make_number (regs.h.ah));
 277
 278   /* Obtain the country code via DPMI, use DJGPP transfer buffer.  */
 279   dpmiregs.x.ax = 0x3800;
 280   dpmiregs.x.ds = xbuf >> 4;
 281   dpmiregs.x.dx = 0;
 282   dpmiregs.x.ss = dpmiregs.x.sp = dpmiregs.x.flags = 0;
 283   _go32_dpmi_simulate_int (0x21, &dpmiregs);
 284   if (dpmiregs.x.flags & 1)
 285     {
 286       dos_country_code = 1;     /* assume USA if 213800 failed */
 287       memcpy (dos_country_info, usa_country_info, DOS_COUNTRY_INFO);
 288     }
 289   else
 290     {
 291       dos_country_code = dpmiregs.x.bx;
 292       dosmemget (xbuf, DOS_COUNTRY_INFO, dos_country_info);
 293     }
 294
 295   dos_set_keyboard (dos_country_code, 0);
 296
 297   regs.x.ax = 0x6601;
 298   intdos (&regs, &regs);
 299   if (regs.x.cflag)
 300     /* Estimate code page from country code */
 301     switch (dos_country_code)
 302       {
 303       case 45: /* Denmark */
 304       case 47: /* Norway */
 305         dos_codepage = 865;
 306         break;
 307       default:
 308         /* US */
 309         dos_codepage = 437;
 310       }
 311   else
 312     dos_codepage = regs.x.bx & 0xffff;
 313
 314 #ifndef HAVE_X_WINDOWS
 315   parent_vm_title[0] = '\0';
 316
 317   /* If we are running from DOS box on MS-Windows, get Windows version.  */
 318   dpmiregs.x.ax = 0x1600;       /* enhanced mode installation check */
 319   dpmiregs.x.ss = dpmiregs.x.sp = dpmiregs.x.flags = 0;
 320   _go32_dpmi_simulate_int (0x2f, &dpmiregs);
 321   /* We only support Windows-specific features when we run on Windows 9X
 322      or on Windows 3.X/enhanced mode.
 323
 324      Int 2Fh/AX=1600h returns:
 325
 326      AL = 00:  no Windows at all;
 327      AL = 01:  Windows/386 2.x;
 328      AL = 80h: Windows 3.x in mode other than enhanced;
 329      AL = FFh: Windows/386 2.x
 330
 331      We also check AH > 0 (Windows 3.1 or later), in case AL tricks us.  */
 332   if (dpmiregs.h.al > 2 && dpmiregs.h.al != 0x80 && dpmiregs.h.al != 0xff
 333       && (dpmiregs.h.al > 3 || dpmiregs.h.ah > 0))
 334     {
 335       dos_windows_version = dpmiregs.x.ax;
 336       Vdos_windows_version =
 337         Fcons (make_number (dpmiregs.h.al), make_number (dpmiregs.h.ah));
 338
 339       /* Save the current title of this virtual machine, so we can restore
 340          it before exiting.  Otherwise, Windows 95 will continue to use
 341          the title we set even after we are history, stupido...  */
 342       if (dpmiregs.h.al >= 4)
 343         {
 344           dpmiregs.x.ax = 0x168e;
 345           dpmiregs.x.dx = 3;    /* get VM title */
 346           dpmiregs.x.cx = sizeof (parent_vm_title) - 1;
 347           dpmiregs.x.es = __tb >> 4;
 348           dpmiregs.x.di = __tb & 15;
 349           dpmiregs.x.sp = dpmiregs.x.ss = dpmiregs.x.flags = 0;
 350           _go32_dpmi_simulate_int (0x2f, &dpmiregs);
 351           if (dpmiregs.x.ax == 1)
 352             dosmemget (__tb, sizeof (parent_vm_title), parent_vm_title);
 353         }
 354     }
 355   else
 356     {
 357       dos_windows_version = 0;
 358       Vdos_windows_version = Qnil;
 359     }
 360 #endif /* !HAVE_X_WINDOWS */
 361
 362   /* Without this, we never see hidden files.
 363      Don't OR it with the previous value, so the value recorded at dump
 364      time, possibly with `preserve-case' flags set, won't get through.  */
 365   __opendir_flags = __OPENDIR_FIND_HIDDEN;
 366
 367 #if __DJGPP_MINOR__ == 0
 368   /* Under LFN, preserve the case of files as recorded in the directory
 369      (in DJGPP 2.01 and later this is automagically done by the library).  */
 370   if (!NILP (Fmsdos_long_file_names ()))
 371     __opendir_flags |= __OPENDIR_PRESERVE_CASE;
 372 #endif /* __DJGPP_MINOR__ == 0 */
 373 }
 374 \f
 375 #ifndef HAVE_X_WINDOWS
 376
 377 /* Emulation of some X window features from xfns.c and xfaces.c.  */
 378
 379 /* Standard VGA colors, in the order of their standard numbering
 380    in the default VGA palette.  */
 381 static char *vga_colors[16] = {
 382   "black", "blue", "green", "cyan", "red", "magenta", "brown",
 383   "lightgray", "darkgray", "lightblue", "lightgreen", "lightcyan",
 384   "lightred", "lightmagenta", "yellow", "white"
 385 };
 386
 387 /* Given a color name, return its index, or -1 if not found.  Note
 388    that this only performs case-insensitive comparison against the
 389    standard names.  For anything more sophisticated, like matching
 390    "gray" with "grey" or translating X color names into their MSDOS
 391    equivalents, call the Lisp function Qtty_color_desc (defined
 392    on lisp/term/tty-colors.el).  */
 393 int
 394 msdos_stdcolor_idx (const char *name)
 395 {
 396   int i;
 397
 398   for (i = 0; i < sizeof (vga_colors) / sizeof (vga_colors[0]); i++)
 399     if (xstrcasecmp (name, vga_colors[i]) == 0)
 400       return i;
 401
 402   return
 403     strcmp (name, unspecified_fg) == 0 ? FACE_TTY_DEFAULT_FG_COLOR
 404     : strcmp (name, unspecified_bg) == 0 ? FACE_TTY_DEFAULT_BG_COLOR
 405     : FACE_TTY_DEFAULT_COLOR;
 406 }
 407
 408 /* Given a color index, return its standard name.  */
 409 Lisp_Object
 410 msdos_stdcolor_name (int idx)
 411 {
 412   extern Lisp_Object Qunspecified;
 413
 414   if (idx == FACE_TTY_DEFAULT_FG_COLOR)
 415     return build_string (unspecified_fg);
 416   else if (idx == FACE_TTY_DEFAULT_BG_COLOR)
 417     return build_string (unspecified_bg);
 418   else if (idx >= 0 && idx < sizeof (vga_colors) / sizeof (vga_colors[0]))
 419     return build_string (vga_colors[idx]);
 420   else
 421     return Qunspecified;        /* meaning the default */
 422 }
 423
 424 /* Support for features that are available when we run in a DOS box
 425    on MS-Windows.  */
 426 int
 427 ms_windows_version (void)
 428 {
 429   return dos_windows_version;
 430 }
 431
 432 /* Set the title of the current virtual machine, to appear on
 433    the caption bar of that machine's window.  */
 434
 435 int
 436 w95_set_virtual_machine_title (const char *title_string)
 437 {
 438   /* Only Windows 9X (version 4 and higher) support this function.  */
 439   if (!NILP (Vdos_windows_version)
 440       && (dos_windows_version & 0xff) >= 4)
 441     {
 442       _go32_dpmi_registers regs;
 443       dosmemput (title_string, strlen (title_string) + 1, __tb);
 444       regs.x.ax = 0x168e;
 445       regs.x.dx = 1;
 446       regs.x.es = __tb >> 4;
 447       regs.x.di = __tb & 15;
 448       regs.x.sp = regs.x.ss = regs.x.flags = 0;
 449       _go32_dpmi_simulate_int (0x2f, &regs);
 450       return regs.x.ax == 1;
 451     }
 452   return 0;
 453 }
 454
 455 /* Change the title of frame F to NAME.
 456    If NAME is nil, use the frame name as the title.
 457
 458    If Emacs is not run from a DOS box on Windows 9X, this only
 459    sets the name in the frame struct, but has no other effects.  */
 460
 461 void
 462 x_set_title (struct frame *f, Lisp_Object name)
 463 {
 464   /* Don't change the title if it's already NAME.  */
 465   if (EQ (name, f->title))
 466     return;
 467
 468   update_mode_lines = 1;
 469
 470   f->title = name;
 471
 472   if (NILP (name))
 473     name = f->name;
 474
 475   if (FRAME_MSDOS_P (f))
 476     {
 477       BLOCK_INPUT;
 478       w95_set_virtual_machine_title (SDATA (name));
 479       UNBLOCK_INPUT;
 480     }
 481 }
 482 #endif /* !HAVE_X_WINDOWS */
 483 \f
 484 DEFUN ("file-system-info", Ffile_system_info, Sfile_system_info, 1, 1, 0,
 485        doc: /* Return storage information about the file system FILENAME is on.
 486 Value is a list of floats (TOTAL FREE AVAIL), where TOTAL is the total
 487 storage of the file system, FREE is the free storage, and AVAIL is the
 488 storage available to a non-superuser.  All 3 numbers are in bytes.
 489 If the underlying system call fails, value is nil.  */)
 490   (Lisp_Object filename)
 491 {
 492   struct statfs stfs;
 493   Lisp_Object encoded, value;
 494
 495   CHECK_STRING (filename);
 496   filename = Fexpand_file_name (filename, Qnil);
 497   encoded = ENCODE_FILE (filename);
 498
 499   if (statfs (SDATA (encoded), &stfs))
 500     value = Qnil;
 501   else
 502     value = list3 (make_float ((double) stfs.f_bsize * stfs.f_blocks),
 503                    make_float ((double) stfs.f_bsize * stfs.f_bfree),
 504                    make_float ((double) stfs.f_bsize * stfs.f_bavail));
 505
 506   return value;
 507 }
 508 \f
 509 /* System depended enumeration of and access to system processes a-la
 510    ps(1).  Here, we only return info about the running Emacs process.
 511    (There are no other processes on DOS, right?)  */
 512
 513 Lisp_Object
 514 list_system_processes (void)
 515 {
 516   Lisp_Object proclist = Qnil;
 517
 518   proclist = Fcons (make_fixnum_or_float (getpid ()), proclist);
 519
 520   return proclist;
 521 }
 522
 523 Lisp_Object
 524 system_process_attributes (Lisp_Object pid)
 525 {
 526   int proc_id;
 527   Lisp_Object attrs = Qnil;
 528
 529   CHECK_NUMBER_OR_FLOAT (pid);
 530   proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
 531
 532   if (proc_id == getpid ())
 533     {
 534       EMACS_INT uid, gid;
 535       char *usr;
 536       struct group *gr;
 537       char cmd[FILENAME_MAX];
 538       char *cmdline = NULL, *p, *q;
 539       size_t cmdline_size = 0;
 540       int i;
 541       Lisp_Object cmd_str, decoded_cmd, tem;
 542       double pmem;
 543       EXFUN (Fget_internal_run_time, 0);
 544 #ifndef SYSTEM_MALLOC
 545       extern unsigned long ret_lim_data ();
 546 #endif
 547
 548       uid = getuid ();
 549       attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
 550       usr = getlogin ();
 551       if (usr)
 552         attrs = Fcons (Fcons (Quser, build_string (usr)), attrs);
 553       gid = getgid ();
 554       attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
 555       gr = getgrgid (gid);
 556       if (gr)
 557         attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
 558       strcpy (cmd, basename (__crt0_argv[0]));
 559       /* Command name is encoded in locale-coding-system; decode it.  */
 560       cmd_str = make_unibyte_string (cmd, strlen (cmd));
 561       decoded_cmd = code_convert_string_norecord (cmd_str,
 562                                                   Vlocale_coding_system, 0);
 563       attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
 564       /* Pretend we have 0 as PPID.  */
 565       attrs = Fcons (Fcons (Qppid, make_number (0)), attrs);
 566       attrs = Fcons (Fcons (Qpgrp, pid), attrs);
 567       attrs = Fcons (Fcons (Qttname, build_string ("/dev/tty")), attrs);
 568       /* We are never idle!  */
 569       tem = Fget_internal_run_time ();
 570       attrs = Fcons (Fcons (Qtime, tem), attrs);
 571       attrs = Fcons (Fcons (Qthcount, make_number (1)), attrs);
 572       attrs = Fcons (Fcons (Qstart,
 573                             Fsymbol_value (intern ("before-init-time"))),
 574                      attrs);
 575       attrs = Fcons (Fcons (Qvsize,
 576                             make_fixnum_or_float ((unsigned long)sbrk (0)/1024)),
 577                      attrs);
 578       attrs = Fcons (Fcons (Qetime, tem), attrs);
 579 #ifndef SYSTEM_MALLOC
 580       /* ret_lim_data is on vm-limit.c, which is not compiled in under
 581          SYSTEM_MALLOC.  */
 582       pmem = (double)((unsigned long) sbrk (0)) / ret_lim_data () * 100.0;
 583       if (pmem > 100)
 584 #endif
 585         pmem = 100;
 586       attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
 587       /* Pass 1: Count how much storage we need.  */
 588       for (i = 0; i < __crt0_argc; i++)
 589         {
 590           cmdline_size += strlen (__crt0_argv[i]) + 1; /* +1 for blank delim */
 591           if (strpbrk (__crt0_argv[i], " \t\n\r\v\f"))
 592             {
 593               cmdline_size += 2;
 594               for (p = __crt0_argv[i]; *p; p++)
 595                 {
 596                   if (*p == '"')
 597                     cmdline_size++;
 598                 }
 599             }
 600         }
 601       /* Pass 2: Allocate storage and concatenate argv[].  */
 602       cmdline = xmalloc (cmdline_size + 1);
 603       for (i = 0, q = cmdline; i < __crt0_argc; i++)
 604         {
 605           if (strpbrk (__crt0_argv[i], " \t\n\r\v\f"))
 606             {
 607               *q++ = '"';
 608               for (p = __crt0_argv[i]; *p; p++)
 609                 {
 610                   if (*p == '\"')
 611                     *q++ = '\\';
 612                   *q++ = *p;
 613                 }
 614               *q++ = '"';
 615             }
 616           else
 617             {
 618               strcpy (q, __crt0_argv[i]);
 619               q += strlen (__crt0_argv[i]);
 620             }
 621           *q++ = ' ';
 622         }
 623       /* Remove the trailing blank.  */
 624       if (q > cmdline)
 625         q[-1] = '\0';
 626
 627       /* Command line is encoded in locale-coding-system; decode it.  */
 628       cmd_str = make_unibyte_string (cmdline, strlen (cmdline));
 629       decoded_cmd = code_convert_string_norecord (cmd_str,
 630                                                   Vlocale_coding_system, 0);
 631       xfree (cmdline);
 632       attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
 633     }
 634
 635   return attrs;
 636 }
 637 \f
 638 void
 639 dos_cleanup (void)
 640 {
 641   struct tty_display_info *tty;
 642
 643 #ifndef HAVE_X_WINDOWS
 644   restore_parent_vm_title ();
 645 #endif
 646   /* Make sure the termscript file is committed, in case we are
 647      crashing and some vital info was written there.  */
 648   if (FRAMEP (selected_frame))
 649     {
 650       struct frame *sf = XFRAME (selected_frame);
 651
 652       if (FRAME_LIVE_P (sf)
 653           && (FRAME_MSDOS_P (sf) || FRAME_TERMCAP_P (sf)))
 654         {
 655           tty = CURTTY ();
 656           if (tty->termscript)
 657             {
 658               fflush (tty->termscript);
 659               fsync (fileno (tty->termscript));
 660             }
 661         }
 662     }
 663 }
 664
 665 /*
 666  *      Define everything
 667  */
 668 void
 669 syms_of_dosfns (void)
 670 {
 671   defsubr (&Sint86);
 672   defsubr (&Sdos_memget);
 673   defsubr (&Sdos_memput);
 674   defsubr (&Smsdos_mouse_init);
 675   defsubr (&Smsdos_mouse_enable);
 676   defsubr (&Smsdos_set_keyboard);
 677   defsubr (&Sinsert_startup_screen);
 678   defsubr (&Smsdos_mouse_disable);
 679   defsubr (&Sfile_system_info);
 680 #ifndef HAVE_X_WINDOWS
 681   defsubr (&Smsdos_mouse_p);
 682 #endif
 683
 684   DEFVAR_INT ("dos-country-code", dos_country_code,
 685               doc: /* The country code returned by Dos when Emacs was started.
 686 Usually this is the international telephone prefix.  */);
 687
 688   DEFVAR_INT ("dos-codepage", dos_codepage,
 689               doc: /* The codepage active when Emacs was started.
 690 The following are known:
 691         437     United States
 692         850     Multilingual (Latin I)
 693         852     Slavic (Latin II)
 694         857     Turkish
 695         860     Portugal
 696         861     Iceland
 697         863     Canada (French)
 698         865     Norway/Denmark  */);
 699
 700   DEFVAR_INT ("dos-timezone-offset", dos_timezone_offset,
 701               doc: /* The current timezone offset to UTC in minutes.
 702 Implicitly modified when the TZ variable is changed.  */);
 703
 704   DEFVAR_LISP ("dos-version", Vdos_version,
 705                doc: /* The (MAJOR . MINOR) Dos version (subject to modification with setver).  */);
 706
 707 #ifndef HAVE_X_WINDOWS
 708   DEFVAR_LISP ("dos-windows-version", Vdos_windows_version,
 709                doc: /* The (MAJOR . MINOR) Windows version for DOS session on MS-Windows.  */);
 710 #endif
 711
 712   DEFVAR_LISP ("dos-display-scancodes", Vdos_display_scancodes,
 713                doc: /* Whether DOS raw keyboard events are displayed as you type.
 714 When non-nil, the keyboard scan-codes are displayed at the bottom right
 715 corner of the display (typically at the end of the mode line).
 716 The output format is: scan code:char code*modifiers.  */);
 717
 718   Vdos_display_scancodes = Qnil;
 719
 720   DEFVAR_INT ("dos-hyper-key", dos_hyper_key,
 721               doc: /* If set to 1, use right ALT key as hyper key.
 722 If set to 2, use right CTRL key as hyper key.  */);
 723   dos_hyper_key = 0;
 724
 725   DEFVAR_INT ("dos-super-key", dos_super_key,
 726               doc: /* If set to 1, use right ALT key as super key.
 727 If set to 2, use right CTRL key as super key.  */);
 728   dos_super_key = 0;
 729
 730   DEFVAR_INT ("dos-keypad-mode", dos_keypad_mode,
 731               doc: /* Controls what key code is returned by a key in the numeric keypad.
 732 The `numlock ON' action is only taken if no modifier keys are pressed.
 733 The value is an integer constructed by adding the following bits together:
 734
 735   0x00  Digit key returns digit    (if numlock ON)
 736   0x01  Digit key returns kp-digit (if numlock ON)
 737   0x02  Digit key returns M-digit  (if numlock ON)
 738   0x03  Digit key returns edit key (if numlock ON)
 739
 740   0x00  Grey key returns char      (if numlock ON)
 741   0x04  Grey key returns kp-key    (if numlock ON)
 742
 743   0x00  Digit key returns digit    (if numlock OFF)
 744   0x10  Digit key returns kp-digit (if numlock OFF)
 745   0x20  Digit key returns M-digit  (if numlock OFF)
 746   0x30  Digit key returns edit key (if numlock OFF)
 747
 748   0x00  Grey key returns char      (if numlock OFF)
 749   0x40  Grey key returns kp-key    (if numlock OFF)
 750
 751   0x200 ALT-0..ALT-9 in top-row produces shifted codes.  */);
 752   dos_keypad_mode = 0x75;
 753
 754   DEFVAR_INT ("dos-keyboard-layout", dos_keyboard_layout,
 755               doc: /* Contains the country code for the current keyboard layout.
 756 Use msdos-set-keyboard to select another keyboard layout.  */);
 757   dos_keyboard_layout = 1;      /* US */
 758
 759   DEFVAR_INT ("dos-decimal-point", dos_decimal_point,
 760               doc: /* The character to produce when kp-decimal key is pressed.
 761 If non-zero, this variable contains the character to be returned when the
 762 decimal point key in the numeric keypad is pressed when Num Lock is on.
 763 If zero, the decimal point key returns the country code specific value.  */);
 764   dos_decimal_point = 0;
 765 }
 766 #endif /* MSDOS */
 767