fileio.c 127 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* File IO for GNU Emacs.
Karl Heuer's avatar
Karl Heuer committed
2
   Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
Jim Blandy's avatar
Jim Blandy committed
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17
any later version.

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

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
20

21
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
22 23 24

#include <sys/types.h>
#include <sys/stat.h>
Jim Blandy's avatar
Jim Blandy committed
25

26 27 28 29
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

30 31 32 33 34 35 36 37
#if !defined (S_ISLNK) && defined (S_IFLNK)
#  define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#endif

#if !defined (S_ISREG) && defined (S_IFREG)
#  define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif

Jim Blandy's avatar
Jim Blandy committed
38
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
39
#include "vms-pwd.h"
Jim Blandy's avatar
Jim Blandy committed
40
#else
Jim Blandy's avatar
Jim Blandy committed
41
#include <pwd.h>
Jim Blandy's avatar
Jim Blandy committed
42 43
#endif

44 45 46 47 48
#ifdef MSDOS
#include "msdos.h"
#include <sys/param.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
49
#include <ctype.h>
Jim Blandy's avatar
Jim Blandy committed
50 51

#ifdef VMS
Richard M. Stallman's avatar
Richard M. Stallman committed
52
#include "vmsdir.h"
Jim Blandy's avatar
Jim Blandy committed
53 54 55 56 57
#include <perror.h>
#include <stddef.h>
#include <string.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
58 59
#include <errno.h>

Jim Blandy's avatar
Jim Blandy committed
60
#ifndef vax11c
Jim Blandy's avatar
Jim Blandy committed
61 62 63
extern int errno;
#endif

64
extern char *strerror ();
Jim Blandy's avatar
Jim Blandy committed
65 66 67 68 69

#ifdef APOLLO
#include <sys/time.h>
#endif

70 71 72
#ifndef USG
#ifndef VMS
#ifndef BSD4_1
73
#ifndef WINDOWSNT
74 75 76 77
#define HAVE_FSYNC
#endif
#endif
#endif
78
#endif
79

Jim Blandy's avatar
Jim Blandy committed
80
#include "lisp.h"
81
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
82 83 84
#include "buffer.h"
#include "window.h"

85 86 87 88 89 90 91
#ifdef WINDOWSNT
#define NOMINMAX 1
#include <windows.h>
#include <stdlib.h>
#include <fcntl.h>
#endif /* not WINDOWSNT */

Jim Blandy's avatar
Jim Blandy committed
92 93 94 95 96 97 98
#ifdef VMS
#include <file.h>
#include <rmsdef.h>
#include <fab.h>
#include <nam.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
99
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
100 101 102

#ifdef HPUX
#include <netio.h>
Jim Blandy's avatar
Jim Blandy committed
103
#ifndef HPUX8
104
#ifndef HPUX9
Jim Blandy's avatar
Jim Blandy committed
105 106
#include <errnet.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
107
#endif
108
#endif
Jim Blandy's avatar
Jim Blandy committed
109 110 111 112 113

#ifndef O_WRONLY
#define O_WRONLY 1
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
114 115 116 117
#ifndef O_RDONLY
#define O_RDONLY 0
#endif

Jim Blandy's avatar
Jim Blandy committed
118 119 120 121 122 123 124 125 126 127
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/* Nonzero during writing of auto-save files */
int auto_saving;

/* Set by auto_save_1 to mode of original file so Fwrite_region will create
   a new file with the same mode as the original */
int auto_save_mode_bits;

128 129 130 131
/* Alist of elements (REGEXP . HANDLER) for file names 
   whose I/O is done with a special handler.  */
Lisp_Object Vfile_name_handler_alist;

132 133 134 135 136 137
/* Format for auto-save files */
Lisp_Object Vauto_save_file_format;

/* Lisp functions for translating file formats */
Lisp_Object Qformat_decode, Qformat_annotate_function;

138 139 140 141 142 143
/* Functions to be called to process text properties in inserted file.  */
Lisp_Object Vafter_insert_file_functions;

/* Functions to be called to create text property annotations for file.  */
Lisp_Object Vwrite_region_annotate_functions;

144 145 146 147
/* During build_annotations, each time an annotation function is called,
   this holds the annotations made by the previous functions.  */
Lisp_Object Vwrite_region_annotations_so_far;

148 149 150
/* File name in which we write a list of all our auto save files.  */
Lisp_Object Vauto_save_list_file_name;

Jim Blandy's avatar
Jim Blandy committed
151 152 153 154 155 156 157 158
/* Nonzero means, when reading a filename in the minibuffer,
 start out by inserting the default directory into the minibuffer. */
int insert_default_directory;

/* On VMS, nonzero means write new files with record format stmlf.
   Zero means use var format.  */
int vms_stmlf_recfm;

159 160 161 162 163 164 165
/* These variables describe handlers that have "already" had a chance
   to handle the current operation.

   Vinhibit_file_name_handlers is a list of file name handlers.
   Vinhibit_file_name_operation is the operation being handled.
   If we try to handle that operation, we ignore those handlers.  */

166
static Lisp_Object Vinhibit_file_name_handlers;
167
static Lisp_Object Vinhibit_file_name_operation;
168

Jim Blandy's avatar
Jim Blandy committed
169 170
Lisp_Object Qfile_error, Qfile_already_exists;

171 172
Lisp_Object Qfile_name_history;

173 174
Lisp_Object Qcar_less_than_car;

Jim Blandy's avatar
Jim Blandy committed
175 176 177 178 179 180
report_file_error (string, data)
     char *string;
     Lisp_Object data;
{
  Lisp_Object errstring;

181
  errstring = build_string (strerror (errno));
Jim Blandy's avatar
Jim Blandy committed
182 183 184 185 186 187 188 189 190 191

  /* System error messages are capitalized.  Downcase the initial
     unless it is followed by a slash.  */
  if (XSTRING (errstring)->data[1] != '/')
    XSTRING (errstring)->data[0] = DOWNCASE (XSTRING (errstring)->data[0]);

  while (1)
    Fsignal (Qfile_error,
	     Fcons (build_string (string), Fcons (errstring, data)));
}
192 193 194 195 196 197

close_file_unwind (fd)
     Lisp_Object fd;
{
  close (XFASTINT (fd));
}
198 199 200 201 202 203 204 205 206

/* Restore point, having saved it as a marker.  */

restore_point_unwind (location)
     Lisp_Object location; 
{
  SET_PT (marker_position (location));
  Fset_marker (location, Qnil, Qnil);
}
Jim Blandy's avatar
Jim Blandy committed
207

208
Lisp_Object Qexpand_file_name;
209
Lisp_Object Qsubstitute_in_file_name;
210 211 212
Lisp_Object Qdirectory_file_name;
Lisp_Object Qfile_name_directory;
Lisp_Object Qfile_name_nondirectory;
213
Lisp_Object Qunhandled_file_name_directory;
214
Lisp_Object Qfile_name_as_directory;
215
Lisp_Object Qcopy_file;
216
Lisp_Object Qmake_directory_internal;
217 218 219 220 221 222 223 224 225 226 227
Lisp_Object Qdelete_directory;
Lisp_Object Qdelete_file;
Lisp_Object Qrename_file;
Lisp_Object Qadd_name_to_file;
Lisp_Object Qmake_symbolic_link;
Lisp_Object Qfile_exists_p;
Lisp_Object Qfile_executable_p;
Lisp_Object Qfile_readable_p;
Lisp_Object Qfile_symlink_p;
Lisp_Object Qfile_writable_p;
Lisp_Object Qfile_directory_p;
228
Lisp_Object Qfile_regular_p;
229 230 231 232 233 234 235
Lisp_Object Qfile_accessible_directory_p;
Lisp_Object Qfile_modes;
Lisp_Object Qset_file_modes;
Lisp_Object Qfile_newer_than_file_p;
Lisp_Object Qinsert_file_contents;
Lisp_Object Qwrite_region;
Lisp_Object Qverify_visited_file_modtime;
236
Lisp_Object Qset_visited_file_modtime;
237

238 239
DEFUN ("find-file-name-handler", Ffind_file_name_handler, Sfind_file_name_handler, 2, 2, 0,
  "Return FILENAME's handler function for OPERATION, if it has one.\n\
240 241
Otherwise, return nil.\n\
A file name is handled if one of the regular expressions in\n\
242
`file-name-handler-alist' matches it.\n\n\
243 244 245
If OPERATION equals `inhibit-file-name-operation', then we ignore\n\
any handlers that are members of `inhibit-file-name-handlers',\n\
but we still do run any other handlers.  This lets handlers\n\
246
use the standard functions without calling themselves recursively.")
247 248
  (filename, operation)
    Lisp_Object filename, operation;
249
{
250
  /* This function must not munge the match data.  */
251
  Lisp_Object chain, inhibited_handlers;
252

253 254
  CHECK_STRING (filename, 0);

255 256 257 258
  if (EQ (operation, Vinhibit_file_name_operation))
    inhibited_handlers = Vinhibit_file_name_handlers;
  else
    inhibited_handlers = Qnil;
259

260
  for (chain = Vfile_name_handler_alist; CONSP (chain);
261 262 263 264
       chain = XCONS (chain)->cdr)
    {
      Lisp_Object elt;
      elt = XCONS (chain)->car;
265
      if (CONSP (elt))
266 267 268
	{
	  Lisp_Object string;
	  string = XCONS (elt)->car;
269
	  if (STRINGP (string) && fast_string_match (string, filename) >= 0)
270 271 272 273 274 275 276 277
	    {
	      Lisp_Object handler, tem;

	      handler = XCONS (elt)->cdr;
	      tem = Fmemq (handler, inhibited_handlers);
	      if (NILP (tem))
		return handler;
	    }
278
	}
279 280

      QUIT;
281 282 283 284
    }
  return Qnil;
}

Jim Blandy's avatar
Jim Blandy committed
285 286
DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory,
  1, 1, 0,
287 288
  "Return the directory component in file name FILENAME.\n\
Return nil if FILENAME does not include a directory.\n\
Jim Blandy's avatar
Jim Blandy committed
289 290 291
Otherwise return a directory spec.\n\
Given a Unix syntax file name, returns a string ending in slash;\n\
on VMS, perhaps instead a string ending in `:', `]' or `>'.")
292 293
  (filename)
     Lisp_Object filename;
Jim Blandy's avatar
Jim Blandy committed
294 295 296
{
  register unsigned char *beg;
  register unsigned char *p;
297
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
298

299
  CHECK_STRING (filename, 0);
Jim Blandy's avatar
Jim Blandy committed
300

301 302
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
303
  handler = Ffind_file_name_handler (filename, Qfile_name_directory);
304
  if (!NILP (handler))
305
    return call2 (handler, Qfile_name_directory, filename);
306

307
#ifdef FILE_SYSTEM_CASE
308
  filename = FILE_SYSTEM_CASE (filename);
309
#endif
310 311
  beg = XSTRING (filename)->data;
  p = beg + XSTRING (filename)->size;
Jim Blandy's avatar
Jim Blandy committed
312

313
  while (p != beg && !IS_ANY_SEP (p[-1])
Jim Blandy's avatar
Jim Blandy committed
314 315 316 317 318 319 320
#ifdef VMS
	 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
#endif /* VMS */
	 ) p--;

  if (p == beg)
    return Qnil;
321
#ifdef DOS_NT
322
  /* Expansion of "c:" to drive and default directory.  */
323
  /* (NT does the right thing.)  */
324 325 326 327 328
  if (p == beg + 2 && beg[1] == ':')
    {
      int drive = (*beg) - 'a';
      /* MAXPATHLEN+1 is guaranteed to be enough space for getdefdir.  */
      unsigned char *res = alloca (MAXPATHLEN + 5);
329 330 331 332 333 334 335 336 337
      unsigned char *res1;
#ifdef WINDOWSNT
      res1 = res;
      /* The NT version places the drive letter at the beginning already.  */
#else /* not WINDOWSNT */
      /* On MSDOG we must put the drive letter in by hand.  */
      res1 = res + 2;
#endif /* not WINDOWSNT */
      if (getdefdir (drive + 1, res)) 
338
	{
339
#ifdef MSDOS
340 341
	  res[0] = drive + 'a';
	  res[1] = ':';
342 343
#endif /* MSDOS */
	  if (IS_DIRECTORY_SEP (res[strlen (res) - 1]))
344 345 346 347 348
	    strcat (res, "/");
	  beg = res;
	  p = beg + strlen (beg);
	}
    }
349
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
350 351 352 353 354
  return make_string (beg, p - beg);
}

DEFUN ("file-name-nondirectory", Ffile_name_nondirectory, Sfile_name_nondirectory,
  1, 1, 0,
355
  "Return file name FILENAME sans its directory.\n\
Jim Blandy's avatar
Jim Blandy committed
356 357 358
For example, in a Unix-syntax file name,\n\
this is everything after the last slash,\n\
or the entire name if it contains no slash.")
359 360
  (filename)
     Lisp_Object filename;
Jim Blandy's avatar
Jim Blandy committed
361 362
{
  register unsigned char *beg, *p, *end;
363
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
364

365
  CHECK_STRING (filename, 0);
Jim Blandy's avatar
Jim Blandy committed
366

367 368
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
369
  handler = Ffind_file_name_handler (filename, Qfile_name_nondirectory);
370
  if (!NILP (handler))
371
    return call2 (handler, Qfile_name_nondirectory, filename);
372

373 374
  beg = XSTRING (filename)->data;
  end = p = beg + XSTRING (filename)->size;
Jim Blandy's avatar
Jim Blandy committed
375

376
  while (p != beg && !IS_ANY_SEP (p[-1])
Jim Blandy's avatar
Jim Blandy committed
377 378 379 380 381 382 383
#ifdef VMS
	 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
#endif /* VMS */
	 ) p--;

  return make_string (p, end - p);
}
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399

DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory, Sunhandled_file_name_directory, 1, 1, 0,
  "Return a directly usable directory name somehow associated with FILENAME.\n\
A `directly usable' directory name is one that may be used without the\n\
intervention of any file handler.\n\
If FILENAME is a directly usable file itself, return\n\
(file-name-directory FILENAME).\n\
The `call-process' and `start-process' functions use this function to\n\
get a current directory to run processes in.")
  (filename)
    Lisp_Object filename;
{
  Lisp_Object handler;

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
400
  handler = Ffind_file_name_handler (filename, Qunhandled_file_name_directory);
401 402 403 404 405 406
  if (!NILP (handler))
    return call2 (handler, Qunhandled_file_name_directory, filename);

  return Ffile_name_directory (filename);
}

Jim Blandy's avatar
Jim Blandy committed
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

char *
file_name_as_directory (out, in)
     char *out, *in;
{
  int size = strlen (in) - 1;

  strcpy (out, in);

#ifdef VMS
  /* Is it already a directory string? */
  if (in[size] == ':' || in[size] == ']' || in[size] == '>')
    return out;
  /* Is it a VMS directory file name?  If so, hack VMS syntax.  */
  else if (! index (in, '/')
	   && ((size > 3 && ! strcmp (&in[size - 3], ".DIR"))
	       || (size > 3 && ! strcmp (&in[size - 3], ".dir"))
	       || (size > 5 && (! strncmp (&in[size - 5], ".DIR", 4)
				|| ! strncmp (&in[size - 5], ".dir", 4))
		   && (in[size - 1] == '.' || in[size - 1] == ';')
		   && in[size] == '1')))
    {
      register char *p, *dot;
      char brack;

      /* x.dir -> [.x]
	 dir:x.dir --> dir:[x]
	 dir:[x]y.dir --> dir:[x.y] */
      p = in + size;
      while (p != in && *p != ':' && *p != '>' && *p != ']') p--;
      if (p != in)
	{
	  strncpy (out, in, p - in);
	  out[p - in] = '\0';
	  if (*p == ':')
	    {
	      brack = ']';
	      strcat (out, ":[");
	    }
	  else
	    {
	      brack = *p;
	      strcat (out, ".");
	    }
	  p++;
	}
      else
	{
	  brack = ']';
	  strcpy (out, "[.");
	}
Jim Blandy's avatar
Jim Blandy committed
458 459
      dot = index (p, '.');
      if (dot)
Jim Blandy's avatar
Jim Blandy committed
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
	{
	  /* blindly remove any extension */
	  size = strlen (out) + (dot - p);
	  strncat (out, p, dot - p);
	}
      else
	{
	  strcat (out, p);
	  size = strlen (out);
	}
      out[size++] = brack;
      out[size] = '\0';
    }
#else /* not VMS */
  /* For Unix syntax, Append a slash if necessary */
475 476 477 478 479
  if (!IS_ANY_SEP (out[size]))
    {
      out[size + 1] = DIRECTORY_SEP;
      out[size + 2] = '\0';
    }
Jim Blandy's avatar
Jim Blandy committed
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
#endif /* not VMS */
  return out;
}

DEFUN ("file-name-as-directory", Ffile_name_as_directory,
       Sfile_name_as_directory, 1, 1, 0,
  "Return a string representing file FILENAME interpreted as a directory.\n\
This operation exists because a directory is also a file, but its name as\n\
a directory is different from its name as a file.\n\
The result can be used as the value of `default-directory'\n\
or passed as second argument to `expand-file-name'.\n\
For a Unix-syntax file name, just appends a slash.\n\
On VMS, converts \"[X]FOO.DIR\" to \"[X.FOO]\", etc.")
  (file)
     Lisp_Object file;
{
  char *buf;
497
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
498 499

  CHECK_STRING (file, 0);
Jim Blandy's avatar
Jim Blandy committed
500
  if (NILP (file))
Jim Blandy's avatar
Jim Blandy committed
501
    return Qnil;
502 503 504

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
505
  handler = Ffind_file_name_handler (file, Qfile_name_as_directory);
506 507 508
  if (!NILP (handler))
    return call2 (handler, Qfile_name_as_directory, file);

Jim Blandy's avatar
Jim Blandy committed
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
  buf = (char *) alloca (XSTRING (file)->size + 10);
  return build_string (file_name_as_directory (buf, XSTRING (file)->data));
}

/*
 * Convert from directory name to filename.
 * On VMS:
 *       xyzzy:[mukesh.emacs] => xyzzy:[mukesh]emacs.dir.1
 *       xyzzy:[mukesh] => xyzzy:[000000]mukesh.dir.1
 * On UNIX, it's simple: just make sure there is a terminating /

 * Value is nonzero if the string output is different from the input.
 */

directory_file_name (src, dst)
     char *src, *dst;
{
  long slen;
#ifdef VMS
  long rlen;
  char * ptr, * rptr;
  char bracket;
  struct FAB fab = cc$rms_fab;
  struct NAM nam = cc$rms_nam;
  char esa[NAM$C_MAXRSS];
#endif /* VMS */

  slen = strlen (src);
#ifdef VMS
  if (! index (src, '/')
      && (src[slen - 1] == ']'
	  || src[slen - 1] == ':'
	  || src[slen - 1] == '>'))
    {
      /* VMS style - convert [x.y.z] to [x.y]z, [x] to [000000]x */
      fab.fab$l_fna = src;
      fab.fab$b_fns = slen;
      fab.fab$l_nam = &nam;
      fab.fab$l_fop = FAB$M_NAM;

      nam.nam$l_esa = esa;
      nam.nam$b_ess = sizeof esa;
      nam.nam$b_nop |= NAM$M_SYNCHK;

      /* We call SYS$PARSE to handle such things as [--] for us. */
      if (SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL)
	{
	  slen = nam.nam$b_esl;
	  if (esa[slen - 1] == ';' && esa[slen - 2] == '.')
	    slen -= 2;
	  esa[slen] = '\0';
	  src = esa;
	}
      if (src[slen - 1] != ']' && src[slen - 1] != '>')
	{
	  /* what about when we have logical_name:???? */
	  if (src[slen - 1] == ':')
566
	    {                   /* Xlate logical name and see what we get */
Jim Blandy's avatar
Jim Blandy committed
567 568 569 570 571 572 573
	      ptr = strcpy (dst, src); /* upper case for getenv */
	      while (*ptr)
		{
		  if ('a' <= *ptr && *ptr <= 'z')
		    *ptr -= 040;
		  ptr++;
		}
574
	      dst[slen - 1] = 0;        /* remove colon */
Jim Blandy's avatar
Jim Blandy committed
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591
	      if (!(src = egetenv (dst)))
		return 0;
	      /* should we jump to the beginning of this procedure?
		 Good points: allows us to use logical names that xlate
		 to Unix names,
		 Bad points: can be a problem if we just translated to a device
		 name...
		 For now, I'll punt and always expect VMS names, and hope for
		 the best! */
	      slen = strlen (src);
	      if (src[slen - 1] != ']' && src[slen - 1] != '>')
		{ /* no recursion here! */
		  strcpy (dst, src);
		  return 0;
		}
	    }
	  else
592
	    {           /* not a directory spec */
Jim Blandy's avatar
Jim Blandy committed
593 594 595 596 597 598 599 600
	      strcpy (dst, src);
	      return 0;
	    }
	}
      bracket = src[slen - 1];

      /* If bracket is ']' or '>', bracket - 2 is the corresponding
	 opening bracket.  */
Jim Blandy's avatar
Jim Blandy committed
601 602
      ptr = index (src, bracket - 2);
      if (ptr == 0)
Jim Blandy's avatar
Jim Blandy committed
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
	{ /* no opening bracket */
	  strcpy (dst, src);
	  return 0;
	}
      if (!(rptr = rindex (src, '.')))
	rptr = ptr;
      slen = rptr - src;
      strncpy (dst, src, slen);
      dst[slen] = '\0';
      if (*rptr == '.')
	{
	  dst[slen++] = bracket;
	  dst[slen] = '\0';
	}
      else
	{
	  /* If we have the top-level of a rooted directory (i.e. xx:[000000]),
	     then translate the device and recurse. */
	  if (dst[slen - 1] == ':'
622
	      && dst[slen - 2] != ':'   /* skip decnet nodes */
Jim Blandy's avatar
Jim Blandy committed
623 624 625 626 627 628 629 630
	      && strcmp(src + slen, "[000000]") == 0)
	    {
	      dst[slen - 1] = '\0';
	      if ((ptr = egetenv (dst))
		  && (rlen = strlen (ptr) - 1) > 0
		  && (ptr[rlen] == ']' || ptr[rlen] == '>')
		  && ptr[rlen - 1] == '.')
		{
631 632 633 634 635
		  char * buf = (char *) alloca (strlen (ptr) + 1);
		  strcpy (buf, ptr);
		  buf[rlen - 1] = ']';
		  buf[rlen] = '\0';
		  return directory_file_name (buf, dst);
Jim Blandy's avatar
Jim Blandy committed
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
		}
	      else
		dst[slen - 1] = ':';
	    }
	  strcat (dst, "[000000]");
	  slen += 8;
	}
      rptr++;
      rlen = strlen (rptr) - 1;
      strncat (dst, rptr, rlen);
      dst[slen + rlen] = '\0';
      strcat (dst, ".DIR.1");
      return 1;
    }
#endif /* VMS */
  /* Process as Unix format: just remove any final slash.
     But leave "/" unchanged; do not change it to "".  */
  strcpy (dst, src);
654 655 656 657 658 659
#ifdef APOLLO
  /* Handle // as root for apollo's.  */
  if ((slen > 2 && dst[slen - 1] == '/')
      || (slen > 1 && dst[0] != '/' && dst[slen - 1] == '/'))
    dst[slen - 1] = 0;
#else
660
  if (slen > 1 
661
      && IS_DIRECTORY_SEP (dst[slen - 1])
662 663 664 665
#ifdef DOS_NT
      && !IS_ANY_SEP (dst[slen - 2])
#endif
      )
Jim Blandy's avatar
Jim Blandy committed
666
    dst[slen - 1] = 0;
667
#endif
Jim Blandy's avatar
Jim Blandy committed
668 669 670 671 672
  return 1;
}

DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name,
  1, 1, 0,
673 674
  "Returns the file name of the directory named DIRECTORY.\n\
This is the name of the file that holds the data for the directory DIRECTORY.\n\
Jim Blandy's avatar
Jim Blandy committed
675 676 677 678 679 680 681 682 683
This operation exists because a directory is also a file, but its name as\n\
a directory is different from its name as a file.\n\
In Unix-syntax, this function just removes the final slash.\n\
On VMS, given a VMS-syntax directory name such as \"[X.Y]\",\n\
it returns a file name such as \"[X]Y.DIR.1\".")
  (directory)
     Lisp_Object directory;
{
  char *buf;
684
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
685 686 687

  CHECK_STRING (directory, 0);

Jim Blandy's avatar
Jim Blandy committed
688
  if (NILP (directory))
Jim Blandy's avatar
Jim Blandy committed
689
    return Qnil;
690 691 692

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
693
  handler = Ffind_file_name_handler (directory, Qdirectory_file_name);
694 695 696
  if (!NILP (handler))
    return call2 (handler, Qdirectory_file_name, directory);

Jim Blandy's avatar
Jim Blandy committed
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
#ifdef VMS
  /* 20 extra chars is insufficient for VMS, since we might perform a
     logical name translation. an equivalence string can be up to 255
     chars long, so grab that much extra space...  - sss */
  buf = (char *) alloca (XSTRING (directory)->size + 20 + 255);
#else
  buf = (char *) alloca (XSTRING (directory)->size + 20);
#endif
  directory_file_name (XSTRING (directory)->data, buf);
  return build_string (buf);
}

DEFUN ("make-temp-name", Fmake_temp_name, Smake_temp_name, 1, 1, 0,
  "Generate temporary file name (string) starting with PREFIX (a string).\n\
The Emacs process number forms part of the result,\n\
so there is no danger of generating a name being used by another process.")
  (prefix)
     Lisp_Object prefix;
{
  Lisp_Object val;
  val = concat2 (prefix, build_string ("XXXXXX"));
  mktemp (XSTRING (val)->data);
  return val;
}

DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
723 724 725
  "Convert filename NAME to absolute, and canonicalize it.\n\
Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative\n\
 (does not start with slash); if DEFAULT-DIRECTORY is nil or missing,\n\
Jim Blandy's avatar
Jim Blandy committed
726
the current buffer's value of default-directory is used.\n\
Jim Blandy's avatar
Jim Blandy committed
727 728 729 730 731 732
Path components that are `.' are removed, and \n\
path components followed by `..' are removed, along with the `..' itself;\n\
note that these simplifications are done without checking the resulting\n\
paths in the file system.\n\
An initial `~/' expands to your home directory.\n\
An initial `~USER/' expands to USER's home directory.\n\
Jim Blandy's avatar
Jim Blandy committed
733
See also the function `substitute-in-file-name'.")
734 735
     (name, default_directory)
     Lisp_Object name, default_directory;
Jim Blandy's avatar
Jim Blandy committed
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
{
  unsigned char *nm;
  
  register unsigned char *newdir, *p, *o;
  int tlen;
  unsigned char *target;
  struct passwd *pw;
#ifdef VMS
  unsigned char * colon = 0;
  unsigned char * close = 0;
  unsigned char * slash = 0;
  unsigned char * brack = 0;
  int lbrack = 0, rbrack = 0;
  int dots = 0;
#endif /* VMS */
751 752
#ifdef DOS_NT
  /* Demacs 1.1.2 91/10/20 Manabu Higashida */
753 754 755
  int drive = -1;
  int relpath = 0;
  unsigned char *tmp, *defdir;
756
#endif /* DOS_NT */
757
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
758 759 760
  
  CHECK_STRING (name, 0);

761 762
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
763
  handler = Ffind_file_name_handler (name, Qexpand_file_name);
764
  if (!NILP (handler))
765
    return call3 (handler, Qexpand_file_name, name, default_directory);
766

767 768 769 770
  /* Use the buffer's default-directory if DEFAULT_DIRECTORY is omitted.  */
  if (NILP (default_directory))
    default_directory = current_buffer->directory;
  CHECK_STRING (default_directory, 1);
771

772
  if (!NILP (default_directory))
773
    {
774
      handler = Ffind_file_name_handler (default_directory, Qexpand_file_name);
775
      if (!NILP (handler))
776
	return call3 (handler, Qexpand_file_name, name, default_directory);
777
    }
778

779
  o = XSTRING (default_directory)->data;
780

781
  /* Make sure DEFAULT_DIRECTORY is properly expanded.
782
     It would be better to do this down below where we actually use
783
     default_directory.  Unfortunately, calling Fexpand_file_name recursively
784 785 786 787
     could invoke GC, and the strings might be relocated.  This would
     be annoying because we have pointers into strings lying around
     that would need adjusting, and people would add new pointers to
     the code and forget to adjust them, resulting in intermittent bugs.
788 789 790
     Putting this call here avoids all that crud.

     The EQ test avoids infinite recursion.  */
791
  if (! NILP (default_directory) && !EQ (default_directory, name)
792
      /* This saves time in a common case.  */
793 794 795
      && ! (XSTRING (default_directory)->size >= 3
	    && IS_DIRECTORY_SEP (XSTRING (default_directory)->data[0])
	    && IS_DEVICE_SEP (XSTRING (default_directory)->data[1])))
796 797 798 799
    {
      struct gcpro gcpro1;

      GCPRO1 (name);
800
      default_directory = Fexpand_file_name (default_directory, Qnil);
801 802 803
      UNGCPRO;
    }

Jim Blandy's avatar
Jim Blandy committed
804 805 806 807
#ifdef VMS
  /* Filenames on VMS are always upper case.  */
  name = Fupcase (name);
#endif
808 809 810
#ifdef FILE_SYSTEM_CASE
  name = FILE_SYSTEM_CASE (name);
#endif
Jim Blandy's avatar
Jim Blandy committed
811 812 813

  nm = XSTRING (name)->data;
  
814
#ifdef MSDOS
815 816
  /* First map all backslashes to slashes.  */
  dostounix_filename (nm = strcpy (alloca (strlen (nm) + 1), nm));
817
#endif
818

819
#ifdef DOS_NT
820
  /* Now strip drive name. */
821 822 823 824 825 826 827
  {
    unsigned char *colon = rindex (nm, ':');
    if (colon)
      if (nm == colon)
	nm++;
      else
	{
828
	  drive = colon[-1];
829
	  nm = colon + 1;
830
	  if (!IS_DIRECTORY_SEP (*nm))
831 832
	    {
	      defdir = alloca (MAXPATHLEN + 1);
Karl Heuer's avatar
Karl Heuer committed
833
	      relpath = getdefdir (tolower (drive) - 'a' + 1, defdir);
834
	    }
835
	}       
836
  }
837
#endif /* DOS_NT */
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
  /* Handle // and /~ in middle of file name
     by discarding everything through the first / of that sequence.  */
  p = nm;
  while (*p)
    {
      /* Since we know the path is absolute, we can assume that each
	 element starts with a "/".  */

      /* "//" anywhere isn't necessarily hairy; we just start afresh
	 with the second slash.  */
      if (IS_DIRECTORY_SEP (p[0]) && IS_DIRECTORY_SEP (p[1])
#if defined (APOLLO) || defined (WINDOWSNT)
	  /* // at start of filename is meaningful on Apollo 
	     and WindowsNT systems */
	  && nm != p
#endif /* APOLLO || WINDOWSNT */
	  )
	nm = p + 1;

      /* "~" is hairy as the start of any path element.  */
      if (IS_DIRECTORY_SEP (p[0]) && p[1] == '~')
	nm = p + 1;

      p++;
    }

Jim Blandy's avatar
Jim Blandy committed
865 866 867
  /* If nm is absolute, flush ...// and detect /./ and /../.
     If no /./ or /../ we can return right away. */
  if (
868
      IS_DIRECTORY_SEP (nm[0])
Jim Blandy's avatar
Jim Blandy committed
869 870 871 872 873
#ifdef VMS
      || index (nm, ':')
#endif /* VMS */
      )
    {
874 875 876 877 878 879 880 881
      /* If it turns out that the filename we want to return is just a
	 suffix of FILENAME, we don't need to go through and edit
	 things; we just need to construct a new string using data
	 starting at the middle of FILENAME.  If we set lose to a
	 non-zero value, that means we've discovered that we can't do
	 that cool trick.  */
      int lose = 0;

Jim Blandy's avatar
Jim Blandy committed
882 883 884
      p = nm;
      while (*p)
	{
885 886 887 888
	  /* Since we know the path is absolute, we can assume that each
	     element starts with a "/".  */

	  /* "." and ".." are hairy.  */
889
	  if (IS_DIRECTORY_SEP (p[0])
890
	      && p[1] == '.'
891
	      && (IS_DIRECTORY_SEP (p[2])
892
		  || p[2] == 0
893
		  || (p[2] == '.' && (IS_DIRECTORY_SEP (p[3])
894
				      || p[3] == 0))))
Jim Blandy's avatar
Jim Blandy committed
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
	    lose = 1;
#ifdef VMS
	  if (p[0] == '\\')
	    lose = 1;
	  if (p[0] == '/') {
	    /* if dev:[dir]/, move nm to / */
	    if (!slash && p > nm && (brack || colon)) {
	      nm = (brack ? brack + 1 : colon + 1);
	      lbrack = rbrack = 0;
	      brack = 0;
	      colon = 0;
	    }
	    slash = p;
	  }
	  if (p[0] == '-')
#ifndef VMS4_4
	    /* VMS pre V4.4,convert '-'s in filenames. */
	    if (lbrack == rbrack)
	      {
914
		if (dots < 2)   /* this is to allow negative version numbers */
Jim Blandy's avatar
Jim Blandy committed
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
		  p[0] = '_';
	      }
	    else
#endif /* VMS4_4 */
	      if (lbrack > rbrack &&
		  ((p[-1] == '.' || p[-1] == '[' || p[-1] == '<') &&
		   (p[1] == '.' || p[1] == ']' || p[1] == '>')))
		lose = 1;
#ifndef VMS4_4
	      else
		p[0] = '_';
#endif /* VMS4_4 */
	  /* count open brackets, reset close bracket pointer */
	  if (p[0] == '[' || p[0] == '<')
	    lbrack++, brack = 0;
	  /* count close brackets, set close bracket pointer */
	  if (p[0] == ']' || p[0] == '>')
	    rbrack++, brack = p;
	  /* detect ][ or >< */
	  if ((p[0] == ']' || p[0] == '>') && (p[1] == '[' || p[1] == '<'))
	    lose = 1;
	  if ((p[0] == ':' || p[0] == ']' || p[0] == '>') && p[1] == '~')
	    nm = p + 1, lose = 1;
	  if (p[0] == ':' && (colon || slash))
	    /* if dev1:[dir]dev2:, move nm to dev2: */
	    if (brack)
	      {
		nm = brack + 1;
		brack = 0;
	      }
	    /* if /pathname/dev:, move nm to dev: */
	    else if (slash)
	      nm = slash + 1;
	    /* if node::dev:, move colon following dev */
	    else if (colon && colon[-1] == ':')
	      colon = p;
	    /* if dev1:dev2:, move nm to dev2: */
	    else if (colon && colon[-1] != ':')
	      {
		nm = colon + 1;
		colon = 0;
	      }
	  if (p[0] == ':' && !colon)
	    {
	      if (p[1] == ':')
		p++;
	      colon = p;
	    }
	  if (lbrack == rbrack)
	    if (p[0] == ';')
	      dots = 2;
	    else if (p[0] == '.')
	      dots++;
#endif /* VMS */
	  p++;
	}
      if (!lose)
	{
#ifdef VMS
	  if (index (nm, '/'))
	    return build_string (sys_translate_unix (nm));
#endif /* VMS */
977
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
978 979 980
	  if (nm == XSTRING (name)->data)
	    return name;
	  return build_string (nm);
981
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
982 983 984 985 986 987 988 989
	}
    }

  /* Now determine directory to start with and put it in newdir */

  newdir = 0;

  if (nm[0] == '~')		/* prefix ~ */
990
    {
991
      if (IS_DIRECTORY_SEP (nm[1])
Jim Blandy's avatar
Jim Blandy committed
992
#ifdef VMS
993
	  || nm[1] == ':'
994
#endif /* VMS */
995 996 997 998
	  || nm[1] == 0)	/* ~ by itself */
	{
	  if (!(newdir = (unsigned char *) egetenv ("HOME")))
	    newdir = (unsigned char *) "";
999
#ifdef DOS_NT
1000 1001 1002 1003
 	  /* Problem when expanding "~\" if HOME is not on current drive.
 	     Ulrich Leodolter, Wed Jan 11 10:20:35 1995 */
 	  if (newdir[1] == ':')
 	    drive = newdir[0];
1004 1005
	  dostounix_filename (newdir);
#endif
1006
	  nm++;
Jim Blandy's avatar
Jim Blandy committed
1007
#ifdef VMS
1008
	  nm++;			/* Don't leave the slash in nm.  */
1009
#endif /* VMS */
1010 1011 1012
	}
      else			/* ~user/filename */
	{
1013
	  for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)
Jim Blandy's avatar
Jim Blandy committed
1014
#ifdef VMS
1015
			      && *p != ':'
1016
#endif /* VMS */
1017 1018 1019 1020 1021
			      ); p++);
	  o = (unsigned char *) alloca (p - nm + 1);
	  bcopy ((char *) nm, o, p - nm);
	  o [p - nm] = 0;

1022 1023 1024 1025
#ifdef  WINDOWSNT
	  newdir = (unsigned char *) egetenv ("HOME");
	  dostounix_filename (newdir);
#else  /* not WINDOWSNT */
1026 1027 1028 1029
	  pw = (struct passwd *) getpwnam (o + 1);
	  if (pw)
	    {
	      newdir = (unsigned char *) pw -> pw_dir;
Jim Blandy's avatar
Jim Blandy committed
1030
#ifdef VMS
1031
	      nm = p + 1;	/* skip the terminator */
Jim Blandy's avatar
Jim Blandy committed
1032
#else
1033
	      nm = p;
1034
#endif /* VMS */
1035
	    }
1036
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1037

1038 1039 1040 1041
	  /* If we don't find a user of that name, leave the name
	     unchanged; don't move nm forward to p.  */
	}
    }
Jim Blandy's avatar
Jim Blandy committed
1042

1043
  if (!IS_ANY_SEP (nm[0])
Jim Blandy's avatar
Jim Blandy committed
1044 1045 1046
#ifdef VMS
      && !index (nm, ':')
#endif /* not VMS */
1047
#ifdef DOS_NT
1048
      && drive == -1
1049
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1050 1051
      && !newdir)
    {
1052
      newdir = XSTRING (default_directory)->data;
Jim Blandy's avatar
Jim Blandy committed
1053 1054
    }

1055
#ifdef DOS_NT
1056 1057
  if (newdir == 0 && relpath)
    newdir = defdir; 
1058
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1059 1060 1061 1062
  if (newdir != 0)
    {
      /* Get rid of any slash at the end of newdir.  */
      int length = strlen (newdir);
1063 1064 1065
      /* Adding `length > 1 &&' makes ~ expand into / when homedir
	 is the root dir.  People disagree about whether that is right.
	 Anyway, we can't take the risk of this change now.  */
1066
#ifdef DOS_NT
1067 1068
      if (newdir[1] != ':' && length > 1)
#endif
1069
      if (IS_DIRECTORY_SEP (newdir[length - 1]))
Jim Blandy's avatar
Jim Blandy committed
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
	{
	  unsigned char *temp = (unsigned char *) alloca (length);
	  bcopy (newdir, temp, length - 1);
	  temp[length - 1] = 0;
	  newdir = temp;
	}
      tlen = length + 1;
    }
  else
    tlen = 0;
Jim Blandy's avatar
Jim Blandy committed
1080

Jim Blandy's avatar
Jim Blandy committed
1081 1082
  /* Now concatenate the directory and name to new space in the stack frame */
  tlen += strlen (nm) + 1;
1083 1084 1085 1086 1087 1088
#ifdef DOS_NT
  /* Add reserved space for drive name.  (The Microsoft x86 compiler 
     produces incorrect code if the following two lines are combined.)  */
  target = (unsigned char *) alloca (tlen + 2);
  target += 2;
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1089
  target = (unsigned char *) alloca (tlen);
1090
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1091 1092 1093 1094 1095
  *target = 0;

  if (newdir)
    {
#ifndef VMS
1096
      if (nm[0] == 0 || IS_DIRECTORY_SEP (nm[0]))
Jim Blandy's avatar
Jim Blandy committed
1097 1098 1099
	strcpy (target, newdir);
      else
#endif
1100
	file_name_as_directory (target, newdir);
Jim Blandy's avatar
Jim Blandy committed
1101 1102 1103 1104 1105 1106 1107 1108
    }

  strcat (target, nm);
#ifdef VMS
  if (index (target, '/'))
    strcpy (target, sys_translate_unix (target));
#endif /* VMS */

1109
  /* Now canonicalize by removing /. and /foo/.. if they appear.  */
Jim Blandy's avatar
Jim Blandy committed
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

  p = target;
  o = target;

  while (*p)
    {
#ifdef VMS
      if (*p != ']' && *p != '>' && *p != '-')
	{
	  if (*p == '\\')
	    p++;
	  *o++ = *p++;
	}
      else if ((p[0] == ']' || p[0] == '>') && p[0] == p[1] + 2)
	/* brackets are offset from each other by 2 */
	{
	  p += 2;
	  if (*p != '.' && *p != '-' && o[-1] != '.')
	    /* convert [foo][bar] to [bar] */
	    while (o[-1] != '[' && o[-1] != '<')
	      o--;
	  else if (*p == '-' && *o != '.')
	    *--p = '.';
	}
      else if (p[0] == '-' && o[-1] == '.' &&
	       (p[1] == '.' || p[1] == ']' || p[1] == '>'))
	/* flush .foo.- ; leave - if stopped by '[' or '<' */
	{
	  do
	    o--;
	  while (o[-1] != '.' && o[-1] != '[' && o[-1] != '<');
1141
	  if (p[1] == '.')      /* foo.-.bar ==> bar.  */
Jim Blandy's avatar
Jim Blandy committed
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
	    p += 2;
	  else if (o[-1] == '.') /* '.foo.-]' ==> ']' */
	    p++, o--;
	  /* else [foo.-] ==> [-] */
	}
      else
	{
#ifndef VMS4_4
	  if (*p == '-' &&
	      o[-1] != '[' && o[-1] != '<' && o[-1] != '.' &&
	      p[1] != ']' && p[1] != '>' && p[1] != '.')
	    *p = '_';
#endif /* VMS4_4 */
	  *o++ = *p++;
	}
#else /* not VMS */
1158 1159
      if (!IS_DIRECTORY_SEP (*p))
	{
Jim Blandy's avatar
Jim Blandy committed
1160 1161
	  *o++ = *p++;
	}
1162 1163 1164 1165
      else if (IS_DIRECTORY_SEP (p[0]) && IS_DIRECTORY_SEP (p[1])
#if defined (APOLLO) || defined (WINDOWSNT)
	       /* // at start of filename is meaningful in Apollo 
		  and WindowsNT systems */
Jim Blandy's avatar
Jim Blandy committed
1166 1167 1168 1169 1170 1171 1172
	       && o != target
#endif /* APOLLO */
	       )
	{
	  o = target;
	  p++;
	}
1173
      else if (IS_DIRECTORY_SEP (p[0])
1174
	       && p[1] == '.'
1175
	       && (IS_DIRECTORY_SEP (p[2])
1176 1177 1178 1179 1180 1181 1182 1183
		   || p[2] == 0))
	{
	  /* If "/." is the entire filename, keep the "/".  Otherwise,
	     just delete the whole "/.".  */
	  if (o == target && p[2] == '\0')
	    *o++ = *p;
	  p += 2;
	}
1184
      else if (IS_DIRECTORY_SEP (p[0]) && p[1] == '.' && p[2] == '.'
Jim Blandy's avatar
Jim Blandy committed
1185 1186
	       /* `/../' is the "superroot" on certain file systems.  */
	       && o != target
1187
	       && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0))
Jim Blandy's avatar
Jim Blandy committed
1188
	{
1189
	  while (o != target && (--o) && !IS_DIRECTORY_SEP (*o))
Jim Blandy's avatar
Jim Blandy committed
1190
	    ;
1191 1192 1193
#if defined (APOLLO) || defined (WINDOWSNT)
	  if (o == target + 1 
	      && IS_DIRECTORY_SEP (o[-1]) && IS_DIRECTORY_SEP (o[0]))
1194 1195
	    ++o;
	  else
1196
#endif /* APOLLO || WINDOWSNT */
1197
	  if (o == target && IS_ANY_SEP (*o))
Jim Blandy's avatar
Jim Blandy committed
1198 1199 1200 1201
	    ++o;
	  p += 3;
	}
      else
1202
	{
Jim Blandy's avatar
Jim Blandy committed
1203 1204 1205 1206 1207
	  *o++ = *p++;
	}
#endif /* not VMS */
    }

1208
#ifdef DOS_NT