w32.c 76.4 KB
Newer Older
1
/* Utility and Unix shadow routines for GNU Emacs on the Microsoft W32 API.
Karl Heuer's avatar
Karl Heuer committed
2
   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
3

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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 2, 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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Richard M. Stallman's avatar
Richard M. Stallman committed
20 21 22 23

   Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
*/

24

Geoff Voelker's avatar
Geoff Voelker committed
25
#include <stddef.h> /* for offsetof */
Richard M. Stallman's avatar
Richard M. Stallman committed
26 27 28
#include <stdlib.h>
#include <stdio.h>
#include <io.h>
29
#include <errno.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
30 31
#include <fcntl.h>
#include <ctype.h>
32
#include <signal.h>
Karl Heuer's avatar
Karl Heuer committed
33
#include <sys/file.h>
34
#include <sys/time.h>
35
#include <sys/utime.h>
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

/* must include CRT headers *before* config.h */
#include "config.h"
#undef access
#undef chdir
#undef chmod
#undef creat
#undef ctime
#undef fopen
#undef link
#undef mkdir
#undef mktemp
#undef open
#undef rename
#undef rmdir
#undef unlink

#undef close
#undef dup
#undef dup2
#undef pipe
#undef read
#undef write
Richard M. Stallman's avatar
Richard M. Stallman committed
59 60 61 62 63

#include "lisp.h"

#include <pwd.h>

64
#include <windows.h>
65

66 67 68 69 70 71 72 73 74 75 76
#ifdef HAVE_SOCKETS	/* TCP connection support, if kernel can do it */
#include <sys/socket.h>
#undef socket
#undef bind
#undef connect
#undef htons
#undef ntohs
#undef inet_addr
#undef gethostname
#undef gethostbyname
#undef getservbyname
Geoff Voelker's avatar
Geoff Voelker committed
77
#undef shutdown
78
#endif
79

Geoff Voelker's avatar
Geoff Voelker committed
80
#include "w32.h"
81
#include "ndir.h"
Geoff Voelker's avatar
Geoff Voelker committed
82
#include "w32heap.h"
Geoff Voelker's avatar
Geoff Voelker committed
83
 
Karl Heuer's avatar
Karl Heuer committed
84 85 86 87 88
#undef min
#undef max
#define min(x, y) (((x) < (y)) ? (x) : (y))
#define max(x, y) (((x) > (y)) ? (x) : (y))

Geoff Voelker's avatar
Geoff Voelker committed
89 90 91 92 93
extern Lisp_Object Vw32_downcase_file_names;
extern Lisp_Object Vw32_generate_fake_inodes;
extern Lisp_Object Vw32_get_true_file_attributes;

static char startup_dir[MAXPATHLEN];
94

Richard M. Stallman's avatar
Richard M. Stallman committed
95
/* Get the current working directory.  */
96
char *
Richard M. Stallman's avatar
Richard M. Stallman committed
97 98
getwd (char *dir)
{
Geoff Voelker's avatar
Geoff Voelker committed
99
#if 0
100 101 102
  if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
    return dir;
  return NULL;
Geoff Voelker's avatar
Geoff Voelker committed
103 104 105 106 107 108 109
#else
  /* Emacs doesn't actually change directory itself, and we want to
     force our real wd to be where emacs.exe is to avoid unnecessary
     conflicts when trying to rename or delete directories.  */
  strcpy (dir, startup_dir);
  return dir;
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
110 111
}

112
#ifndef HAVE_SOCKETS
Richard M. Stallman's avatar
Richard M. Stallman committed
113 114 115 116 117 118 119 120
/* Emulate gethostname.  */
int
gethostname (char *buffer, int size)
{
  /* NT only allows small host names, so the buffer is 
     certainly large enough.  */
  return !GetComputerName (buffer, &size);
}
121
#endif /* HAVE_SOCKETS */
Richard M. Stallman's avatar
Richard M. Stallman committed
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136

/* Emulate getloadavg.  */
int
getloadavg (double loadavg[], int nelem)
{
  int i;

  /* A faithful emulation is going to have to be saved for a rainy day.  */
  for (i = 0; i < nelem; i++) 
    {
      loadavg[i] = 0.0;
    }
  return i;
}

137
/* Emulate getpwuid, getpwnam and others.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
138

Geoff Voelker's avatar
Geoff Voelker committed
139 140 141 142 143 144 145
#define PASSWD_FIELD_SIZE 256

static char the_passwd_name[PASSWD_FIELD_SIZE];
static char the_passwd_passwd[PASSWD_FIELD_SIZE];
static char the_passwd_gecos[PASSWD_FIELD_SIZE];
static char the_passwd_dir[PASSWD_FIELD_SIZE];
static char the_passwd_shell[PASSWD_FIELD_SIZE];
Richard M. Stallman's avatar
Richard M. Stallman committed
146 147 148 149 150 151 152 153 154 155 156 157 158

static struct passwd the_passwd = 
{
  the_passwd_name,
  the_passwd_passwd,
  0,
  0,
  0,
  the_passwd_gecos,
  the_passwd_dir,
  the_passwd_shell,
};

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
int 
getuid () 
{ 
  return the_passwd.pw_uid;
}

int 
geteuid () 
{ 
  /* I could imagine arguing for checking to see whether the user is
     in the Administrators group and returning a UID of 0 for that
     case, but I don't know how wise that would be in the long run.  */
  return getuid (); 
}

int 
getgid () 
{ 
  return the_passwd.pw_gid;
}

int 
getegid () 
{ 
  return getgid ();
}

Richard M. Stallman's avatar
Richard M. Stallman committed
186 187 188
struct passwd *
getpwuid (int uid)
{
189 190 191
  if (uid == the_passwd.pw_uid)
    return &the_passwd;
  return NULL;
Richard M. Stallman's avatar
Richard M. Stallman committed
192 193 194 195 196 197 198 199 200 201 202
}

struct passwd *
getpwnam (char *name)
{
  struct passwd *pw;
  
  pw = getpwuid (getuid ());
  if (!pw)
    return pw;

203
  if (stricmp (name, pw->pw_name))
Richard M. Stallman's avatar
Richard M. Stallman committed
204 205 206 207 208
    return NULL;

  return pw;
}

209 210
void
init_user_info ()
Richard M. Stallman's avatar
Richard M. Stallman committed
211
{
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
  /* Find the user's real name by opening the process token and
     looking up the name associated with the user-sid in that token.

     Use the relative portion of the identifier authority value from
     the user-sid as the user id value (same for group id using the
     primary group sid from the process token). */

  char            user_sid[256], name[256], domain[256];
  DWORD           length = sizeof (name), dlength = sizeof (domain), trash;
  HANDLE          token = NULL;
  SID_NAME_USE    user_type;

  if (OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &token)
      && GetTokenInformation (token, TokenUser,
			      (PVOID) user_sid, sizeof (user_sid), &trash)
      && LookupAccountSid (NULL, *((PSID *) user_sid), name, &length,
			   domain, &dlength, &user_type))
Richard M. Stallman's avatar
Richard M. Stallman committed
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
      strcpy (the_passwd.pw_name, name);
      /* Determine a reasonable uid value. */
      if (stricmp ("administrator", name) == 0)
	{
	  the_passwd.pw_uid = 0;
	  the_passwd.pw_gid = 0;
	}
      else
	{
	  SID_IDENTIFIER_AUTHORITY * pSIA;

	  pSIA = GetSidIdentifierAuthority (*((PSID *) user_sid));
	  /* I believe the relative portion is the last 4 bytes (of 6)
	     with msb first. */
	  the_passwd.pw_uid = ((pSIA->Value[2] << 24) +
			       (pSIA->Value[3] << 16) +
			       (pSIA->Value[4] << 8)  +
			       (pSIA->Value[5] << 0));
	  /* restrict to conventional uid range for normal users */
	  the_passwd.pw_uid = the_passwd.pw_uid % 60001;

	  /* Get group id */
	  if (GetTokenInformation (token, TokenPrimaryGroup,
				   (PVOID) user_sid, sizeof (user_sid), &trash))
	    {
	      SID_IDENTIFIER_AUTHORITY * pSIA;

	      pSIA = GetSidIdentifierAuthority (*((PSID *) user_sid));
	      the_passwd.pw_gid = ((pSIA->Value[2] << 24) +
				   (pSIA->Value[3] << 16) +
				   (pSIA->Value[4] << 8)  +
				   (pSIA->Value[5] << 0));
	      /* I don't know if this is necessary, but for safety... */
	      the_passwd.pw_gid = the_passwd.pw_gid % 60001;
	    }
	  else
	    the_passwd.pw_gid = the_passwd.pw_uid;
	}
    }
  /* If security calls are not supported (presumably because we
       are running under Windows 95), fallback to this. */
  else if (GetUserName (name, &length))
    {
      strcpy (the_passwd.pw_name, name);
      if (stricmp ("administrator", name) == 0)
	the_passwd.pw_uid = 0;
      else
	the_passwd.pw_uid = 123;
      the_passwd.pw_gid = the_passwd.pw_uid;
    }
  else
    {
      strcpy (the_passwd.pw_name, "unknown");
      the_passwd.pw_uid = 123;
      the_passwd.pw_gid = 123;
Richard M. Stallman's avatar
Richard M. Stallman committed
285
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
286

287 288 289 290
  /* Ensure HOME and SHELL are defined. */
  if (getenv ("HOME") == NULL)
    putenv ("HOME=c:/");
  if (getenv ("SHELL") == NULL)
Geoff Voelker's avatar
Geoff Voelker committed
291
    putenv (os_subtype == OS_WIN95 ? "SHELL=command" : "SHELL=cmd");
Richard M. Stallman's avatar
Richard M. Stallman committed
292

293 294 295
  /* Set dir and shell from environment variables. */
  strcpy (the_passwd.pw_dir, getenv ("HOME"));
  strcpy (the_passwd.pw_shell, getenv ("SHELL"));
296

297 298
  if (token)
    CloseHandle (token);
Richard M. Stallman's avatar
Richard M. Stallman committed
299 300 301
}

int
302
random ()
Richard M. Stallman's avatar
Richard M. Stallman committed
303
{
304 305
  /* rand () on NT gives us 15 random bits...hack together 30 bits.  */
  return ((rand () << 15) | rand ());
Richard M. Stallman's avatar
Richard M. Stallman committed
306 307 308
}

void
309
srandom (int seed)
Richard M. Stallman's avatar
Richard M. Stallman committed
310
{
311
  srand (seed);
Richard M. Stallman's avatar
Richard M. Stallman committed
312 313
}

Geoff Voelker's avatar
Geoff Voelker committed
314

315 316 317 318 319 320 321 322 323 324 325 326
/* Normalize filename by converting all path separators to
   the specified separator.  Also conditionally convert upper
   case path name components to lower case.  */

static void
normalize_filename (fp, path_sep)
     register char *fp;
     char path_sep;
{
  char sep;
  char *elem;

327 328 329 330 331 332 333 334 335 336 337
  /* Always lower-case drive letters a-z, even if the filesystem
     preserves case in filenames.
     This is so filenames can be compared by string comparison
     functions that are case-sensitive.  Even case-preserving filesystems
     do not distinguish case in drive letters.  */
  if (fp[1] == ':' && *fp >= 'A' && *fp <= 'Z')
    {
      *fp += 'a' - 'A';
      fp += 2;
    }

338
  if (NILP (Vw32_downcase_file_names))
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
    {
      while (*fp)
	{
	  if (*fp == '/' || *fp == '\\')
	    *fp = path_sep;
	  fp++;
	}
      return;
    }

  sep = path_sep;		/* convert to this path separator */
  elem = fp;			/* start of current path element */

  do {
    if (*fp >= 'a' && *fp <= 'z')
      elem = 0;			/* don't convert this element */

    if (*fp == 0 || *fp == ':')
      {
	sep = *fp;		/* restore current separator (or 0) */
	*fp = '/';		/* after conversion of this element */
      }

    if (*fp == '/' || *fp == '\\')
      {
	if (elem && elem != fp)
	  {
	    *fp = 0;		/* temporary end of string */
	    _strlwr (elem);	/* while we convert to lower case */
	  }
	*fp = sep;		/* convert (or restore) path separator */
	elem = fp + 1;		/* next element starts after separator */
	sep = path_sep;
      }
  } while (*fp++);
}

376
/* Destructively turn backslashes into slashes.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
377
void
378 379
dostounix_filename (p)
     register char *p;
Richard M. Stallman's avatar
Richard M. Stallman committed
380
{
381
  normalize_filename (p, '/');
Richard M. Stallman's avatar
Richard M. Stallman committed
382 383
}

384
/* Destructively turn slashes into backslashes.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
385
void
386 387
unixtodos_filename (p)
     register char *p;
Richard M. Stallman's avatar
Richard M. Stallman committed
388
{
389
  normalize_filename (p, '\\');
Richard M. Stallman's avatar
Richard M. Stallman committed
390 391
}

392 393 394
/* Remove all CR's that are followed by a LF.
   (From msdos.c...probably should figure out a way to share it,
   although this code isn't going to ever change.)  */
Karl Heuer's avatar
Karl Heuer committed
395
int
396 397 398
crlf_to_lf (n, buf)
     register int n;
     register unsigned char *buf;
Karl Heuer's avatar
Karl Heuer committed
399
{
400 401 402
  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;
Karl Heuer's avatar
Karl Heuer committed
403

404 405 406
  if (n == 0)
    return n;
  while (buf < endp - 1)
Richard M. Stallman's avatar
Richard M. Stallman committed
407
    {
408 409 410 411 412 413 414
      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
Richard M. Stallman's avatar
Richard M. Stallman committed
415
    }
416 417 418
  if (buf < endp)
    *np++ = *buf++;
  return np - startp;
Richard M. Stallman's avatar
Richard M. Stallman committed
419 420
}

Geoff Voelker's avatar
Geoff Voelker committed
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
/* Parse the root part of file name, if present.  Return length and
    optionally store pointer to char after root.  */
static int
parse_root (char * name, char ** pPath)
{
  char * start = name;

  if (name == NULL)
    return 0;

  /* find the root name of the volume if given */
  if (isalpha (name[0]) && name[1] == ':')
    {
      /* skip past drive specifier */
      name += 2;
      if (IS_DIRECTORY_SEP (name[0]))
	name++;
    }
  else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
    {
      int slashes = 2;
      name += 2;
      do
        {
	  if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
	    break;
	  name++;
	}
      while ( *name );
      if (IS_DIRECTORY_SEP (name[0]))
	name++;
    }

  if (pPath)
    *pPath = name;

  return name - start;
}

/* Get long base name for name; name is assumed to be absolute.  */
static int
get_long_basename (char * name, char * buf, int size)
{
  WIN32_FIND_DATA find_data;
  HANDLE dir_handle;
  int len = 0;

468 469 470 471
  /* must be valid filename, no wild cards or other illegal characters */
  if (strpbrk (name, "*?|<>\""))
    return 0;

Geoff Voelker's avatar
Geoff Voelker committed
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
  dir_handle = FindFirstFile (name, &find_data);
  if (dir_handle != INVALID_HANDLE_VALUE)
    {
      if ((len = strlen (find_data.cFileName)) < size)
	memcpy (buf, find_data.cFileName, len + 1);
      else
	len = 0;
      FindClose (dir_handle);
    }
  return len;
}

/* Get long name for file, if possible (assumed to be absolute).  */
BOOL
w32_get_long_filename (char * name, char * buf, int size)
{
  char * o = buf;
  char * p;
  char * q;
  char full[ MAX_PATH ];
  int len;

  len = strlen (name);
  if (len >= MAX_PATH)
    return FALSE;

  /* Use local copy for destructive modification.  */
  memcpy (full, name, len+1);
  unixtodos_filename (full);

  /* Copy root part verbatim.  */
  len = parse_root (full, &p);
  memcpy (o, full, len);
  o += len;
506
  *o = '\0';
Geoff Voelker's avatar
Geoff Voelker committed
507 508
  size -= len;

509
  while (p != NULL && *p)
Geoff Voelker's avatar
Geoff Voelker committed
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
    {
      q = p;
      p = strchr (q, '\\');
      if (p) *p = '\0';
      len = get_long_basename (full, o, size);
      if (len > 0)
	{
	  o += len;
	  size -= len;
	  if (p != NULL)
	    {
	      *p++ = '\\';
	      if (size < 2)
		return FALSE;
	      *o++ = '\\';
	      size--;
	      *o = '\0';
	    }
	}
      else
	return FALSE;
    }

  return TRUE;
}

536 537 538 539 540 541 542 543 544 545 546 547 548
int
is_unc_volume (const char *filename)
{
  const char *ptr = filename;

  if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
    return 0;

  if (strpbrk (ptr + 2, "*?|<>\"\\/"))
    return 0;

  return 1;
}
Geoff Voelker's avatar
Geoff Voelker committed
549

Richard M. Stallman's avatar
Richard M. Stallman committed
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
/* Routines that are no-ops on NT but are defined to get Emacs to compile.  */

int 
sigsetmask (int signal_mask) 
{ 
  return 0;
}

int 
sigblock (int sig) 
{ 
  return 0;
}

int 
setpgrp (int pid, int gid) 
{ 
  return 0;
}

int 
alarm (int seconds) 
{ 
  return 0;
}

576
void 
Richard M. Stallman's avatar
Richard M. Stallman committed
577 578
unrequest_sigio (void) 
{ 
579
  return;
Richard M. Stallman's avatar
Richard M. Stallman committed
580 581
}

582
void
Richard M. Stallman's avatar
Richard M. Stallman committed
583 584
request_sigio (void) 
{ 
585
  return;
Richard M. Stallman's avatar
Richard M. Stallman committed
586 587
}

588
#define REG_ROOT "SOFTWARE\\GNU\\Emacs"
589 590

LPBYTE 
591
w32_get_resource (key, lpdwtype)
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
    char *key;
    LPDWORD lpdwtype;
{
  LPBYTE lpvalue;
  HKEY hrootkey = NULL;
  DWORD cbData;
  BOOL ok = FALSE;
  
  /* Check both the current user and the local machine to see if 
     we have any resources.  */
  
  if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      lpvalue = NULL;

      if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS 
	  && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL 
	  && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
	{
	  return (lpvalue);
	}

      if (lpvalue) xfree (lpvalue);
	
      RegCloseKey (hrootkey);
    } 
  
  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      lpvalue = NULL;
	
Geoff Voelker's avatar
Geoff Voelker committed
623 624 625
      if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
	  && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
	  && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
626 627 628 629 630 631 632 633 634 635 636 637
	{
	  return (lpvalue);
	}
	
      if (lpvalue) xfree (lpvalue);
	
      RegCloseKey (hrootkey);
    } 
  
  return (NULL);
}

638 639 640
char *get_emacs_configuration (void);
extern Lisp_Object Vsystem_configuration;

641 642 643
void
init_environment ()
{
Karl Heuer's avatar
Karl Heuer committed
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
  int len;
  static const char * const tempdirs[] = {
    "$TMPDIR", "$TEMP", "$TMP", "c:/"
  };
  int i;
  const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);

  /* Make sure they have a usable $TMPDIR.  Many Emacs functions use
     temporary files and assume "/tmp" if $TMPDIR is unset, which
     will break on DOS/Windows.  Refuse to work if we cannot find
     a directory, not even "c:/", usable for that purpose.  */
  for (i = 0; i < imax ; i++)
    {
      const char *tmp = tempdirs[i];

      if (*tmp == '$')
	tmp = getenv (tmp + 1);
      /* Note that `access' can lie to us if the directory resides on a
	 read-only filesystem, like CD-ROM or a write-protected floppy.
	 The only way to be really sure is to actually create a file and
	 see if it succeeds.  But I think that's too much to ask.  */
      if (tmp && access (tmp, D_OK) == 0)
	{
	  char * var = alloca (strlen (tmp) + 8);
	  sprintf (var, "TMPDIR=%s", tmp);
	  putenv (var);
	  break;
	}
    }
  if (i >= imax)
    cmd_error_internal
      (Fcons (Qerror,
	      Fcons (build_string ("no usable temporary directories found!!"),
		     Qnil)),
       "While setting TMPDIR: ");

680 681
  /* Check for environment variables and use registry if they don't exist */
  {
682 683 684
    int i;
    LPBYTE lpval;
    DWORD dwType;
685

686 687 688
    static char * env_vars[] = 
    {
      "HOME",
689
      "PRELOAD_WINSOCK",
690 691 692
      "emacs_dir",
      "EMACSLOADPATH",
      "SHELL",
Geoff Voelker's avatar
Geoff Voelker committed
693
      "CMDPROXY",
694 695 696
      "EMACSDATA",
      "EMACSPATH",
      "EMACSLOCKDIR",
Geoff Voelker's avatar
Geoff Voelker committed
697 698 699
      /* We no longer set INFOPATH because Info-default-directory-list
	 is then ignored.  We use a hook in winnt.el instead.  */
      /*      "INFOPATH", */
700 701 702 703 704
      "EMACSDOC",
      "TERM",
    };

    for (i = 0; i < (sizeof (env_vars) / sizeof (env_vars[0])); i++) 
705
      {
Geoff Voelker's avatar
Geoff Voelker committed
706 707
	if (!getenv (env_vars[i])
	    && (lpval = w32_get_resource (env_vars[i], &dwType)) != NULL)
708 709 710 711 712 713 714 715 716 717 718 719
	  {
	    if (dwType == REG_EXPAND_SZ)
	      {
		char buf1[500], buf2[500];

		ExpandEnvironmentStrings ((LPSTR) lpval, buf1, 500);
		_snprintf (buf2, 499, "%s=%s", env_vars[i], buf1);
		putenv (strdup (buf2));
	      }
	    else if (dwType == REG_SZ)
	      {
		char buf[500];
720
		  
721 722 723
		_snprintf (buf, 499, "%s=%s", env_vars[i], lpval);
		putenv (strdup (buf));
	      }
724

725 726 727 728 729
	    xfree (lpval);
	  }
      }
  }

730 731 732
  /* Rebuild system configuration to reflect invoking system.  */
  Vsystem_configuration = build_string (EMACS_CONFIGURATION);

Geoff Voelker's avatar
Geoff Voelker committed
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
  /* Another special case: on NT, the PATH variable is actually named
     "Path" although cmd.exe (perhaps NT itself) arranges for
     environment variable lookup and setting to be case insensitive.
     However, Emacs assumes a fully case sensitive environment, so we
     need to change "Path" to "PATH" to match the expectations of
     various elisp packages.  We do this by the sneaky method of
     modifying the string in the C runtime environ entry.

     The same applies to COMSPEC.  */
  {
    char ** envp;

    for (envp = environ; *envp; envp++)
      if (_strnicmp (*envp, "PATH=", 5) == 0)
	memcpy (*envp, "PATH=", 5);
      else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
	memcpy (*envp, "COMSPEC=", 8);
  }

  /* Remember the initial working directory for getwd, then make the
     real wd be the location of emacs.exe to avoid conflicts when
     renaming or deleting directories.  (We also don't call chdir when
     running subprocesses for the same reason.)  */
  if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
    abort ();

  {
    char *p;
    char modname[MAX_PATH];

    if (!GetModuleFileName (NULL, modname, MAX_PATH))
      abort ();
    if ((p = strrchr (modname, '\\')) == NULL)
      abort ();
    *p = 0;

    SetCurrentDirectory (modname);
  }

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
  init_user_info ();
}

/* We don't have scripts to automatically determine the system configuration
   for Emacs before it's compiled, and we don't want to have to make the
   user enter it, so we define EMACS_CONFIGURATION to invoke this runtime
   routine.  */

static char configuration_buffer[32];

char *
get_emacs_configuration (void)
{
  char *arch, *oem, *os;

  /* Determine the processor type.  */
  switch (get_processor_type ()) 
    {

#ifdef PROCESSOR_INTEL_386
    case PROCESSOR_INTEL_386:
    case PROCESSOR_INTEL_486:
    case PROCESSOR_INTEL_PENTIUM:
      arch = "i386";
      break;
#endif

#ifdef PROCESSOR_INTEL_860
    case PROCESSOR_INTEL_860:
      arch = "i860";
      break;
#endif

#ifdef PROCESSOR_MIPS_R2000
    case PROCESSOR_MIPS_R2000:
    case PROCESSOR_MIPS_R3000:
    case PROCESSOR_MIPS_R4000:
      arch = "mips";
      break;
#endif

#ifdef PROCESSOR_ALPHA_21064
    case PROCESSOR_ALPHA_21064:
      arch = "alpha";
      break;
#endif

    default:
      arch = "unknown";
      break;
822
    }
823 824 825 826

  /* Let oem be "*" until we figure out how to decode the OEM field.  */
  oem = "*";

Geoff Voelker's avatar
Geoff Voelker committed
827
  os = (GetVersion () & OS_WIN95) ? "windows95" : "nt";
828 829

  sprintf (configuration_buffer, "%s-%s-%s%d.%d", arch, oem, os,
830
	   get_w32_major_version (), get_w32_minor_version ());
831
  return configuration_buffer;
832 833
}

Karl Heuer's avatar
Karl Heuer committed
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
#include <sys/timeb.h>

/* Emulate gettimeofday (Ulrich Leodolter, 1/11/95).  */
void 
gettimeofday (struct timeval *tv, struct timezone *tz)
{
  struct _timeb tb;
  _ftime (&tb);

  tv->tv_sec = tb.time;
  tv->tv_usec = tb.millitm * 1000L;
  if (tz) 
    {
      tz->tz_minuteswest = tb.timezone;	/* minutes west of Greenwich  */
      tz->tz_dsttime = tb.dstflag;	/* type of dst correction  */
    }
}

852
/* ------------------------------------------------------------------------- */
853
/* IO support and wrapper functions for W32 API. */
854
/* ------------------------------------------------------------------------- */
Richard M. Stallman's avatar
Richard M. Stallman committed
855

856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
/* Place a wrapper around the MSVC version of ctime.  It returns NULL
   on network directories, so we handle that case here.  
   (Ulrich Leodolter, 1/11/95).  */
char *
sys_ctime (const time_t *t)
{
  char *str = (char *) ctime (t);
  return (str ? str : "Sun Jan 01 00:00:00 1970");
}

/* Emulate sleep...we could have done this with a define, but that
   would necessitate including windows.h in the files that used it.
   This is much easier.  */
void
sys_sleep (int seconds)
{
  Sleep (seconds * 1000);
}

Geoff Voelker's avatar
Geoff Voelker committed
875
/* Internal MSVC functions for low-level descriptor munging */
876 877 878 879 880 881
extern int __cdecl _set_osfhnd (int fd, long h);
extern int __cdecl _free_osfhnd (int fd);

/* parallel array of private info on file handles */
filedesc fd_info [ MAXDESC ];

Geoff Voelker's avatar
Geoff Voelker committed
882 883 884 885 886 887 888 889
typedef struct volume_info_data {
  struct volume_info_data * next;

  /* time when info was obtained */
  DWORD     timestamp;

  /* actual volume info */
  char *    root_dir;
890 891 892
  DWORD     serialnum;
  DWORD     maxcomp;
  DWORD     flags;
Geoff Voelker's avatar
Geoff Voelker committed
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
  char *    name;
  char *    type;
} volume_info_data;

/* Global referenced by various functions.  */
static volume_info_data volume_info;

/* Vector to indicate which drives are local and fixed (for which cached
   data never expires).  */
static BOOL fixed_drives[26];

/* Consider cached volume information to be stale if older than 10s,
   at least for non-local drives.  Info for fixed drives is never stale.  */
#define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
#define VOLINFO_STILL_VALID( root_dir, info )		\
  ( ( isalpha (root_dir[0]) &&				\
      fixed_drives[ DRIVE_INDEX (root_dir[0]) ] )	\
    || GetTickCount () - info->timestamp < 10000 )

/* Cache support functions.  */

/* Simple linked list with linear search is sufficient.  */
static volume_info_data *volume_cache = NULL;

static volume_info_data *
lookup_volume_info (char * root_dir)
{
  volume_info_data * info;

  for (info = volume_cache; info; info = info->next)
    if (stricmp (info->root_dir, root_dir) == 0)
      break;
  return info;
}

static void
add_volume_info (char * root_dir, volume_info_data * info)
{
  info->root_dir = strdup (root_dir);
  info->next = volume_cache;
  volume_cache = info;
}


/* Wrapper for GetVolumeInformation, which uses caching to avoid
   performance penalty (~2ms on 486 for local drives, 7.5ms for local
   cdrom drive, ~5-10ms or more for remote drives on LAN).  */
volume_info_data *
GetCachedVolumeInformation (char * root_dir)
{
  volume_info_data * info;
  char default_root[ MAX_PATH ];

  /* NULL for root_dir means use root from current directory.  */
  if (root_dir == NULL)
    {
      if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
	return NULL;
      parse_root (default_root, &root_dir);
      *root_dir = 0;
      root_dir = default_root;
    }

  /* Local fixed drives can be cached permanently.  Removable drives
     cannot be cached permanently, since the volume name and serial
     number (if nothing else) can change.  Remote drives should be
     treated as if they are removable, since there is no sure way to
     tell whether they are or not.  Also, the UNC association of drive
     letters mapped to remote volumes can be changed at any time (even
     by other processes) without notice.
   
     As a compromise, so we can benefit from caching info for remote
     volumes, we use a simple expiry mechanism to invalidate cache
     entries that are more than ten seconds old.  */

#if 0
  /* No point doing this, because WNetGetConnection is even slower than
     GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
     GetDriveType is about the only call of this type which does not
     involve network access, and so is extremely quick).  */

  /* Map drive letter to UNC if remote. */
  if ( isalpha( root_dir[0] ) && !fixed[ DRIVE_INDEX( root_dir[0] ) ] )
    {
      char remote_name[ 256 ];
      char drive[3] = { root_dir[0], ':' };

      if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
	  == NO_ERROR)
	/* do something */ ;
    }
#endif

  info = lookup_volume_info (root_dir);

  if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
  {
    char  name[ 256 ];
    DWORD serialnum;
    DWORD maxcomp;
    DWORD flags;
    char  type[ 256 ];

    /* Info is not cached, or is stale. */
    if (!GetVolumeInformation (root_dir,
			       name, sizeof (name),
			       &serialnum,
			       &maxcomp,
			       &flags,
			       type, sizeof (type)))
      return NULL;

    /* Cache the volume information for future use, overwriting existing
       entry if present.  */
    if (info == NULL)
      {
	info = (volume_info_data *) xmalloc (sizeof (volume_info_data));
	add_volume_info (root_dir, info);
      }
    else
      {
	free (info->name);
	free (info->type);
      }

    info->name = strdup (name);
    info->serialnum = serialnum;
    info->maxcomp = maxcomp;
    info->flags = flags;
    info->type = strdup (type);
    info->timestamp = GetTickCount ();
  }

  return info;
}
1028 1029 1030 1031 1032

/* Get information on the volume where name is held; set path pointer to
   start of pathname in name (past UNC header\volume header if present).  */
int
get_volume_info (const char * name, const char ** pPath)
Richard M. Stallman's avatar
Richard M. Stallman committed
1033
{
1034 1035
  char temp[MAX_PATH];
  char *rootname = NULL;  /* default to current volume */
Geoff Voelker's avatar
Geoff Voelker committed
1036
  volume_info_data * info;
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050

  if (name == NULL)
    return FALSE;

  /* find the root name of the volume if given */
  if (isalpha (name[0]) && name[1] == ':')
    {
      rootname = temp;
      temp[0] = *name++;
      temp[1] = *name++;
      temp[2] = '\\';
      temp[3] = 0;
    }
  else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
Richard M. Stallman's avatar
Richard M. Stallman committed
1051
    {
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
      char *str = temp;
      int slashes = 4;
      rootname = temp;
      do
        {
	  if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
	    break;
	  *str++ = *name++;
	}
      while ( *name );

      *str++ = '\\';
      *str = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
1065
    }
1066 1067 1068 1069

  if (pPath)
    *pPath = name;
    
Geoff Voelker's avatar
Geoff Voelker committed
1070 1071
  info = GetCachedVolumeInformation (rootname);
  if (info != NULL)
Richard M. Stallman's avatar
Richard M. Stallman committed
1072
    {
Geoff Voelker's avatar
Geoff Voelker committed
1073 1074
      /* Set global referenced by other functions.  */
      volume_info = *info;
1075
      return TRUE;
Richard M. Stallman's avatar
Richard M. Stallman committed
1076
    }
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
  return FALSE;
}

/* Determine if volume is FAT format (ie. only supports short 8.3
   names); also set path pointer to start of pathname in name.  */
int
is_fat_volume (const char * name, const char ** pPath)
{
  if (get_volume_info (name, pPath))
    return (volume_info.maxcomp == 12);
  return FALSE;
}

/* Map filename to a legal 8.3 name if necessary. */
const char *
1092
map_w32_filename (const char * name, const char ** pPath)
1093 1094 1095 1096 1097
{
  static char shortname[MAX_PATH];
  char * str = shortname;
  char c;
  char * path;
Geoff Voelker's avatar
Geoff Voelker committed
1098
  const char * save_name = name;
1099 1100

  if (is_fat_volume (name, &path)) /* truncate to 8.3 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1101
    {
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
      register int left = 8;	/* maximum number of chars in part */
      register int extn = 0;	/* extension added? */
      register int dots = 2;	/* maximum number of dots allowed */

      while (name < path)
	*str++ = *name++;	/* skip past UNC header */

      while ((c = *name++))
        {
	  switch ( c )
	    {
	    case '\\':
	    case '/':
	      *str++ = '\\';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case ':':
	      *str++ = ':';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case '.':
	      if ( dots )
	        {
		  /* Convert path components of the form .xxx to _xxx,
		     but leave . and .. as they are.  This allows .emacs
		     to be read as _emacs, for example.  */

		  if (! *name ||
		      *name == '.' ||
		      IS_DIRECTORY_SEP (*name))
		    {
		      *str++ = '.';
		      dots--;
		    }
		  else
		    {
		      *str++ = '_';
		      left--;
		      dots = 0;
		    }
		}
	      else if ( !extn )
	        {
		  *str++ = '.';
		  extn = 1;		/* we've got an extension */
		  left = 3;		/* 3 chars in extension */
		}
	      else
	        {
		  /* any embedded dots after the first are converted to _ */
		  *str++ = '_';
		}
	      break;
	    case '~':
	    case '#':			/* don't lose these, they're important */
	      if ( ! left )
		str[-1] = c;		/* replace last character of part */
	      /* FALLTHRU */
	    default:
	      if ( left )
	        {
		  *str++ = tolower (c);	/* map to lower case (looks nicer) */
		  left--;
		  dots = 0;		/* started a path component */
		}
	      break;
	    }
	}
      *str = '\0';
1175 1176 1177 1178 1179
    }
  else
    {
      strcpy (shortname, name);
      unixtodos_filename (shortname);
Richard M. Stallman's avatar
Richard M. Stallman committed
1180
    }
1181 1182

  if (pPath)
Geoff Voelker's avatar
Geoff Voelker committed
1183
    *pPath = shortname + (path - save_name);
1184

1185
  return shortname;
1186 1187
}

Karl Heuer's avatar
Karl Heuer committed
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
static int
is_exec (const char * name)
{
  char * p = strrchr (name, '.');
  return
    (p != NULL
     && (stricmp (p, ".exe") == 0 ||
	 stricmp (p, ".com") == 0 ||
	 stricmp (p, ".bat") == 0 ||
	 stricmp (p, ".cmd") == 0));
}

Geoff Voelker's avatar
Geoff Voelker committed
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
/* Emulate the Unix directory procedures opendir, closedir, 
   and readdir.  We can't use the procedures supplied in sysdep.c,
   so we provide them here.  */

struct direct dir_static;       /* simulated directory contents */
static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
static int    dir_is_fat;
static char   dir_pathname[MAXPATHLEN+1];
static WIN32_FIND_DATA dir_find_data;

1210 1211 1212 1213 1214 1215 1216
/* Support shares on a network resource as subdirectories of a read-only
   root directory. */
static HANDLE wnet_enum_handle = INVALID_HANDLE_VALUE;
HANDLE open_unc_volume (char *);
char  *read_unc_volume (HANDLE, char *, int);
void   close_unc_volume (HANDLE);

Geoff Voelker's avatar
Geoff Voelker committed
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
DIR *
opendir (char *filename)
{
  DIR *dirp;

  /* Opening is done by FindFirstFile.  However, a read is inherent to
     this operation, so we defer the open until read time.  */

  if (dir_find_handle != INVALID_HANDLE_VALUE)
    return NULL;
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
  if (wnet_enum_handle != INVALID_HANDLE_VALUE)
    return NULL;

  if (is_unc_volume (filename))
    {
      wnet_enum_handle = open_unc_volume (filename);
      if (wnet_enum_handle == INVALID_HANDLE_VALUE)
	return NULL;
    }

  if (!(dirp = (DIR *) malloc (sizeof (DIR))))
    return NULL;
Geoff Voelker's avatar
Geoff Voelker committed
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259

  dirp->dd_fd = 0;
  dirp->dd_loc = 0;
  dirp->dd_size = 0;

  strncpy (dir_pathname, map_w32_filename (filename, NULL), MAXPATHLEN);
  dir_pathname[MAXPATHLEN] = '\0';
  dir_is_fat = is_fat_volume (filename, NULL);

  return dirp;
}

void
closedir (DIR *dirp)
{
  /* If we have a find-handle open, close it.  */
  if (dir_find_handle != INVALID_HANDLE_VALUE)
    {
      FindClose (dir_find_handle);
      dir_find_handle = INVALID_HANDLE_VALUE;
    }
1260 1261 1262 1263 1264
  else if (wnet_enum_handle != INVALID_HANDLE_VALUE)
    {
      close_unc_volume (wnet_enum_handle);
      wnet_enum_handle = INVALID_HANDLE_VALUE;
    }
Geoff Voelker's avatar
Geoff Voelker committed
1265 1266 1267 1268 1269 1270
  xfree ((char *) dirp);
}

struct direct *
readdir (DIR *dirp)
{
1271 1272 1273 1274 1275 1276 1277
  if (wnet_enum_handle != INVALID_HANDLE_VALUE)
    {
      if (!read_unc_volume (wnet_enum_handle, 
			      dir_find_data.cFileName, 
			      MAX_PATH))
	return NULL;
    }
Geoff Voelker's avatar
Geoff Voelker committed
1278
  /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
1279
  else if (dir_find_handle == INVALID_HANDLE_VALUE)
Geoff Voelker's avatar
Geoff Voelker committed
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
    {
      char filename[MAXNAMLEN + 3];
      int ln;

      strcpy (filename, dir_pathname);
      ln = strlen (filename) - 1;
      if (!IS_DIRECTORY_SEP (filename[ln]))
	strcat (filename, "\\");
      strcat (filename, "*");

      dir_find_handle = FindFirstFile (filename, &dir_find_data);

      if (dir_find_handle == INVALID_HANDLE_VALUE)
	return NULL;
    }
  else
    {
      if (!FindNextFile (dir_find_handle, &dir_find_data))
	return NULL;
    }
  
  /* Emacs never uses this value, so don't bother making it match
     value returned by stat().  */
  dir_static.d_ino = 1;
  
  dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
    dir_static.d_namlen - dir_static.d_namlen % 4;
  
  dir_static.d_namlen = strlen (dir_find_data.cFileName);
  strcpy (dir_static.d_name, dir_find_data.cFileName);
  if (dir_is_fat)
    _strlwr (dir_static.d_name);
  else if (!NILP (Vw32_downcase_file_names))
    {
      register char *p;
      for (p = dir_static.d_name; *p; p++)
	if (*p >= 'a' && *p <= 'z')
	  break;
      if (!*p)
	_strlwr (dir_static.d_name);
    }
  
  return &dir_static;
}

1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
HANDLE
open_unc_volume (char *path)
{
  NETRESOURCE nr; 
  HANDLE henum;
  int result;

  nr.dwScope = RESOURCE_GLOBALNET; 
  nr.dwType = RESOURCETYPE_DISK; 
  nr.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER; 
  nr.dwUsage = RESOURCEUSAGE_CONTAINER; 
  nr.lpLocalName = NULL; 
  nr.lpRemoteName = map_w32_filename (path, NULL);
  nr.lpComment = NULL; 
  nr.lpProvider = NULL;   

  result = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_DISK,  
			RESOURCEUSAGE_CONNECTABLE, &nr, &henum);

  if (result == NO_ERROR)
    return henum;
  else
    return INVALID_HANDLE_VALUE;
}

char *
read_unc_volume (HANDLE henum, char *readbuf, int size)
{
  int count;
  int result;
  int bufsize = 512;
  char *buffer;
  char *ptr;

  count = 1;
  buffer = alloca (bufsize);
  result = WNetEnumResource (wnet_enum_handle, &count, buffer, &bufsize);
  if (result != NO_ERROR)
    return NULL;

  /* WNetEnumResource returns \\resource\share...skip forward to "share". */
  ptr = ((LPNETRESOURCE) buffer)->lpRemoteName;
  ptr += 2;
  while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
  ptr++;

  strncpy (readbuf, ptr, size);
  return readbuf;
}

void
close_unc_volume (HANDLE henum)
{
  if (henum != INVALID_HANDLE_VALUE)
    WNetCloseEnum (henum);
}

DWORD
unc_volume_file_attributes (char *path)
{
  HANDLE henum;
  DWORD attrs;

  henum = open_unc_volume (path);
  if (henum == INVALID_HANDLE_VALUE)
    return -1;

  attrs = FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY;

  close_unc_volume (henum);

  return attrs;
}

1399 1400 1401 1402 1403 1404 1405 1406 1407

/* Shadow some MSVC runtime functions to map requests for long filenames
   to reasonable short names if necessary.  This was originally added to
   permit running Emacs on NT 3.1 on a FAT partition, which doesn't support 
   long file names.  */

int
sys_access (const char * path, int mode)
{
Karl Heuer's avatar
Karl Heuer committed
1408 1409 1410 1411
  DWORD attributes;

  /* MSVC implementation doesn't recognize D_OK.  */
  path = map_w32_filename (path, NULL);
1412 1413 1414 1415 1416 1417 1418 1419 1420
  if (is_unc_volume (path))
    {
      attributes = unc_volume_file_attributes (path);
      if (attributes == -1) {
	errno = EACCES;
	return -1;
      }
    }
  else if ((attributes = GetFileAttributes (path)) == -1)
Karl Heuer's avatar
Karl Heuer committed
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
    {
      /* Should try mapping GetLastError to errno; for now just indicate
	 that path doesn't exist.  */
      errno = EACCES;
      return -1;
    }
  if ((mode & X_OK) != 0 && !is_exec (path))
    {
      errno = EACCES;
      return -1;
    }
  if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
    {
      errno = EACCES;
      return -1;
    }
  if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
    {
      errno = EACCES;
      return -1;
    }
  return 0;
1443 1444 1445 1446 1447
}

int
sys_chdir (const char * path)
{
1448
  return _chdir (map_w32_filename (path, NULL));
1449 1450 1451 1452 1453
}

int
sys_chmod (const char * path, int mode)
{
1454
  return _chmod (map_w32_filename (path, NULL), mode);
1455 1456 1457 1458 1459
}

int
sys_creat (const char * path, int mode)
{
1460
  return _creat (map_w32_filename (path, NULL), mode);
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
}

FILE *
sys_fopen(const char * path, const char * mode)
{
  int fd;
  int oflag;
  const char * mode_save = mode;

  /* Force all file handles to be non-inheritable.  This is necessary to
     ensure child processes don't unwittingly inherit handles that might
     prevent future file access. */

  if (mode[0] == 'r')
    oflag = O_RDONLY;
  else if (mode[0] == 'w' || mode[0] == 'a')
    oflag = O_WRONLY | O_CREAT | O_TRUNC;
Richard M. Stallman's avatar
Richard M. Stallman committed
1478
  else
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
    return NULL;

  /* Only do simplistic option parsing. */
  while (*++mode)
    if (mode[0] == '+')
      {
	oflag &= ~(O_RDONLY | O_WRONLY);
	oflag |= O_RDWR;
      }
    else if (mode[0] == 'b')
      {
	oflag &= ~O_TEXT;
	oflag |= O_BINARY;
      }
    else if (mode[0] == 't')
      {
	oflag &= ~O_BINARY;
	oflag |= O_TEXT;
      }
    else break;

1500
  fd = _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
1501 1502 1503
  if (fd < 0)
    return NULL;

Geoff Voelker's avatar
Geoff Voelker committed
1504
  return _fdopen (fd, mode_save);
Richard M. Stallman's avatar
Richard M. Stallman committed
1505
}
1506

Geoff Voelker's avatar
Geoff Voelker committed
1507
/* This only works on NTFS volumes, but is useful to have.  */