fileio.c 122 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* File IO for GNU Emacs.
2
   Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994 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 18 19
any later version.

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

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

20
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
21 22 23

#include <sys/types.h>
#include <sys/stat.h>
Jim Blandy's avatar
Jim Blandy committed
24

25 26 27 28
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

29 30 31 32 33 34 35 36
#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
37
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
38
#include "vms-pwd.h"
Jim Blandy's avatar
Jim Blandy committed
39
#else
Jim Blandy's avatar
Jim Blandy committed
40
#include <pwd.h>
Jim Blandy's avatar
Jim Blandy committed
41 42
#endif

43 44 45 46 47
#ifdef MSDOS
#include "msdos.h"
#include <sys/param.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
48
#include <ctype.h>
Jim Blandy's avatar
Jim Blandy committed
49 50

#ifdef VMS
Richard M. Stallman's avatar
Richard M. Stallman committed
51
#include "vmsdir.h"
Jim Blandy's avatar
Jim Blandy committed
52 53 54 55 56
#include <perror.h>
#include <stddef.h>
#include <string.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
57 58
#include <errno.h>

Jim Blandy's avatar
Jim Blandy committed
59
#ifndef vax11c
Jim Blandy's avatar
Jim Blandy committed
60 61 62
extern int errno;
#endif

63
extern char *strerror ();
Jim Blandy's avatar
Jim Blandy committed
64 65 66 67 68

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

69 70 71
#ifndef USG
#ifndef VMS
#ifndef BSD4_1
72
#ifndef WINDOWSNT
73 74 75 76
#define HAVE_FSYNC
#endif
#endif
#endif
77
#endif
78

Jim Blandy's avatar
Jim Blandy committed
79
#include "lisp.h"
80
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
81 82 83
#include "buffer.h"
#include "window.h"

84 85 86 87 88 89 90
#ifdef WINDOWSNT
#define NOMINMAX 1
#include <windows.h>
#include <stdlib.h>
#include <fcntl.h>
#endif /* not WINDOWSNT */

Jim Blandy's avatar
Jim Blandy committed
91 92 93 94 95 96 97
#ifdef VMS
#include <file.h>
#include <rmsdef.h>
#include <fab.h>
#include <nam.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
98
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
99 100 101

#ifdef HPUX
#include <netio.h>
Jim Blandy's avatar
Jim Blandy committed
102
#ifndef HPUX8
103
#ifndef HPUX9
Jim Blandy's avatar
Jim Blandy committed
104 105
#include <errnet.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
106
#endif
107
#endif
Jim Blandy's avatar
Jim Blandy committed
108 109 110 111 112

#ifndef O_WRONLY
#define O_WRONLY 1
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
113 114 115 116
#ifndef O_RDONLY
#define O_RDONLY 0
#endif

Jim Blandy's avatar
Jim Blandy committed
117 118 119 120 121 122 123 124 125 126
#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;

127 128 129 130
/* Alist of elements (REGEXP . HANDLER) for file names 
   whose I/O is done with a special handler.  */
Lisp_Object Vfile_name_handler_alist;

131 132 133 134 135 136
/* 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;

137 138 139 140
/* 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;

141 142 143
/* 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
144 145 146 147 148 149 150 151
/* 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;

152 153 154 155 156 157 158
/* 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.  */

159
static Lisp_Object Vinhibit_file_name_handlers;
160
static Lisp_Object Vinhibit_file_name_operation;
161

Jim Blandy's avatar
Jim Blandy committed
162 163
Lisp_Object Qfile_error, Qfile_already_exists;

164 165
Lisp_Object Qfile_name_history;

166 167
Lisp_Object Qcar_less_than_car;

Jim Blandy's avatar
Jim Blandy committed
168 169 170 171 172 173
report_file_error (string, data)
     char *string;
     Lisp_Object data;
{
  Lisp_Object errstring;

174
  errstring = build_string (strerror (errno));
Jim Blandy's avatar
Jim Blandy committed
175 176 177 178 179 180 181 182 183 184

  /* 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)));
}
185 186 187 188 189 190

close_file_unwind (fd)
     Lisp_Object fd;
{
  close (XFASTINT (fd));
}
191 192 193 194 195 196 197 198 199

/* 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
200

201
Lisp_Object Qexpand_file_name;
202
Lisp_Object Qsubstitute_in_file_name;
203 204 205
Lisp_Object Qdirectory_file_name;
Lisp_Object Qfile_name_directory;
Lisp_Object Qfile_name_nondirectory;
206
Lisp_Object Qunhandled_file_name_directory;
207
Lisp_Object Qfile_name_as_directory;
208
Lisp_Object Qcopy_file;
209
Lisp_Object Qmake_directory_internal;
210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
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;
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;
228
Lisp_Object Qset_visited_file_modtime;
229

230 231
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\
232 233
Otherwise, return nil.\n\
A file name is handled if one of the regular expressions in\n\
234
`file-name-handler-alist' matches it.\n\n\
235 236 237
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\
238
use the standard functions without calling themselves recursively.")
239 240
  (filename, operation)
    Lisp_Object filename, operation;
241
{
242
  /* This function must not munge the match data.  */
243
  Lisp_Object chain, inhibited_handlers;
244

245 246
  CHECK_STRING (filename, 0);

247 248 249 250
  if (EQ (operation, Vinhibit_file_name_operation))
    inhibited_handlers = Vinhibit_file_name_handlers;
  else
    inhibited_handlers = Qnil;
251

252
  for (chain = Vfile_name_handler_alist; CONSP (chain);
253 254 255 256
       chain = XCONS (chain)->cdr)
    {
      Lisp_Object elt;
      elt = XCONS (chain)->car;
257
      if (CONSP (elt))
258 259 260
	{
	  Lisp_Object string;
	  string = XCONS (elt)->car;
261
	  if (STRINGP (string) && fast_string_match (string, filename) >= 0)
262 263 264 265 266 267 268 269
	    {
	      Lisp_Object handler, tem;

	      handler = XCONS (elt)->cdr;
	      tem = Fmemq (handler, inhibited_handlers);
	      if (NILP (tem))
		return handler;
	    }
270
	}
271 272

      QUIT;
273 274 275 276
    }
  return Qnil;
}

Jim Blandy's avatar
Jim Blandy committed
277 278 279 280 281 282 283 284 285 286 287 288
DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory,
  1, 1, 0,
  "Return the directory component in file name NAME.\n\
Return nil if NAME does not include a directory.\n\
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 `>'.")
  (file)
     Lisp_Object file;
{
  register unsigned char *beg;
  register unsigned char *p;
289
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
290 291 292

  CHECK_STRING (file, 0);

293 294
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
295
  handler = Ffind_file_name_handler (file, Qfile_name_directory);
296 297 298
  if (!NILP (handler))
    return call2 (handler, Qfile_name_directory, file);

299 300 301
#ifdef FILE_SYSTEM_CASE
  file = FILE_SYSTEM_CASE (file);
#endif
Jim Blandy's avatar
Jim Blandy committed
302 303 304
  beg = XSTRING (file)->data;
  p = beg + XSTRING (file)->size;

305
  while (p != beg && !IS_ANY_SEP (p[-1])
Jim Blandy's avatar
Jim Blandy committed
306 307 308 309 310 311 312
#ifdef VMS
	 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
#endif /* VMS */
	 ) p--;

  if (p == beg)
    return Qnil;
313
#ifdef DOS_NT
314
  /* Expansion of "c:" to drive and default directory.  */
315
  /* (NT does the right thing.)  */
316 317 318 319 320
  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);
321 322 323 324 325 326 327 328 329
      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)) 
330
	{
331
#ifdef MSDOS
332 333
	  res[0] = drive + 'a';
	  res[1] = ':';
334 335
#endif /* MSDOS */
	  if (IS_DIRECTORY_SEP (res[strlen (res) - 1]))
336 337 338 339 340
	    strcat (res, "/");
	  beg = res;
	  p = beg + strlen (beg);
	}
    }
341
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
342 343 344 345 346 347 348 349 350 351 352 353 354
  return make_string (beg, p - beg);
}

DEFUN ("file-name-nondirectory", Ffile_name_nondirectory, Sfile_name_nondirectory,
  1, 1, 0,
  "Return file name NAME sans its directory.\n\
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.")
  (file)
     Lisp_Object file;
{
  register unsigned char *beg, *p, *end;
355
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
356 357 358

  CHECK_STRING (file, 0);

359 360
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
361
  handler = Ffind_file_name_handler (file, Qfile_name_nondirectory);
362 363 364
  if (!NILP (handler))
    return call2 (handler, Qfile_name_nondirectory, file);

Jim Blandy's avatar
Jim Blandy committed
365 366 367
  beg = XSTRING (file)->data;
  end = p = beg + XSTRING (file)->size;

368
  while (p != beg && !IS_ANY_SEP (p[-1])
Jim Blandy's avatar
Jim Blandy committed
369 370 371 372 373 374 375
#ifdef VMS
	 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
#endif /* VMS */
	 ) p--;

  return make_string (p, end - p);
}
376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391

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.  */
392
  handler = Ffind_file_name_handler (filename, Qunhandled_file_name_directory);
393 394 395 396 397 398
  if (!NILP (handler))
    return call2 (handler, Qunhandled_file_name_directory, filename);

  return Ffile_name_directory (filename);
}

Jim Blandy's avatar
Jim Blandy committed
399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449

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
450 451
      dot = index (p, '.');
      if (dot)
Jim Blandy's avatar
Jim Blandy committed
452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
	{
	  /* 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 */
467 468 469 470 471
  if (!IS_ANY_SEP (out[size]))
    {
      out[size + 1] = DIRECTORY_SEP;
      out[size + 2] = '\0';
    }
Jim Blandy's avatar
Jim Blandy committed
472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488
#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;
489
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
490 491

  CHECK_STRING (file, 0);
Jim Blandy's avatar
Jim Blandy committed
492
  if (NILP (file))
Jim Blandy's avatar
Jim Blandy committed
493
    return Qnil;
494 495 496

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
497
  handler = Ffind_file_name_handler (file, Qfile_name_as_directory);
498 499 500
  if (!NILP (handler))
    return call2 (handler, Qfile_name_as_directory, file);

Jim Blandy's avatar
Jim Blandy committed
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557
  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] == ':')
558
	    {                   /* Xlate logical name and see what we get */
Jim Blandy's avatar
Jim Blandy committed
559 560 561 562 563 564 565
	      ptr = strcpy (dst, src); /* upper case for getenv */
	      while (*ptr)
		{
		  if ('a' <= *ptr && *ptr <= 'z')
		    *ptr -= 040;
		  ptr++;
		}
566
	      dst[slen - 1] = 0;        /* remove colon */
Jim Blandy's avatar
Jim Blandy committed
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583
	      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
584
	    {           /* not a directory spec */
Jim Blandy's avatar
Jim Blandy committed
585 586 587 588 589 590 591 592
	      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
593 594
      ptr = index (src, bracket - 2);
      if (ptr == 0)
Jim Blandy's avatar
Jim Blandy committed
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
	{ /* 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] == ':'
614
	      && dst[slen - 2] != ':'   /* skip decnet nodes */
Jim Blandy's avatar
Jim Blandy committed
615 616 617 618 619 620 621 622
	      && 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] == '.')
		{
623 624 625 626 627
		  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
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
		}
	      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);
646
  if (slen > 1 
647 648
      && IS_DIRECTORY_SEP (dst[slen - 1])
      && !IS_DEVICE_SEP (dst[slen - 2]))
Jim Blandy's avatar
Jim Blandy committed
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
    dst[slen - 1] = 0;
  return 1;
}

DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name,
  1, 1, 0,
  "Returns the file name of the directory named DIR.\n\
This is the name of the file that holds the data for the directory DIR.\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\
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;
666
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
667 668 669

  CHECK_STRING (directory, 0);

Jim Blandy's avatar
Jim Blandy committed
670
  if (NILP (directory))
Jim Blandy's avatar
Jim Blandy committed
671
    return Qnil;
672 673 674

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
675
  handler = Ffind_file_name_handler (directory, Qdirectory_file_name);
676 677 678
  if (!NILP (handler))
    return call2 (handler, Qdirectory_file_name, directory);

Jim Blandy's avatar
Jim Blandy committed
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
#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,
  "Convert FILENAME to absolute, and canonicalize it.\n\
Second arg DEFAULT is directory to start with if FILENAME is relative\n\
 (does not start with slash); if DEFAULT is nil or missing,\n\
the current buffer's value of default-directory is used.\n\
Jim Blandy's avatar
Jim Blandy committed
709 710 711 712 713 714
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
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
See also the function `substitute-in-file-name'.")
     (name, defalt)
     Lisp_Object name, defalt;
{
  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 */
733 734
#ifdef DOS_NT
  /* Demacs 1.1.2 91/10/20 Manabu Higashida */
735 736 737
  int drive = -1;
  int relpath = 0;
  unsigned char *tmp, *defdir;
738
#endif /* DOS_NT */
739
  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
740 741 742
  
  CHECK_STRING (name, 0);

743 744
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
745
  handler = Ffind_file_name_handler (name, Qexpand_file_name);
746
  if (!NILP (handler))
Richard M. Stallman's avatar
Richard M. Stallman committed
747
    return call3 (handler, Qexpand_file_name, name, defalt);
748 749 750 751 752 753
  if (!NILP (defalt))
    {
      handler = Ffind_file_name_handler (defalt, Qexpand_file_name);
      if (!NILP (handler))
	return call3 (handler, Qexpand_file_name, name, defalt);
    }
754

755 756 757 758 759
  /* Use the buffer's default-directory if DEFALT is omitted.  */
  if (NILP (defalt))
    defalt = current_buffer->directory;
  CHECK_STRING (defalt, 1);

760 761
  o = XSTRING (defalt)->data;

762 763 764 765 766 767 768
  /* Make sure DEFALT is properly expanded.
     It would be better to do this down below where we actually use
     defalt.  Unfortunately, calling Fexpand_file_name recursively
     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.
769 770 771 772 773
     Putting this call here avoids all that crud.

     The EQ test avoids infinite recursion.  */
  if (! NILP (defalt) && !EQ (defalt, name)
      /* This saves time in a common case.  */
774 775 776
      && ! (XSTRING (defalt)->size >= 3
	    && IS_DIRECTORY_SEP (XSTRING (defalt)->data[0])
	    && IS_DEVICE_SEP (XSTRING (defalt)->data[1])))
777 778 779 780 781 782 783 784
    {
      struct gcpro gcpro1;

      GCPRO1 (name);
      defalt = Fexpand_file_name (defalt, Qnil);
      UNGCPRO;
    }

Jim Blandy's avatar
Jim Blandy committed
785 786 787 788
#ifdef VMS
  /* Filenames on VMS are always upper case.  */
  name = Fupcase (name);
#endif
789 790 791
#ifdef FILE_SYSTEM_CASE
  name = FILE_SYSTEM_CASE (name);
#endif
Jim Blandy's avatar
Jim Blandy committed
792 793 794

  nm = XSTRING (name)->data;
  
795
#ifdef MSDOS
796 797
  /* First map all backslashes to slashes.  */
  dostounix_filename (nm = strcpy (alloca (strlen (nm) + 1), nm));
798
#endif
799

800
#ifdef DOS_NT
801
  /* Now strip drive name. */
802 803 804 805 806 807 808 809 810
  {
    unsigned char *colon = rindex (nm, ':');
    if (colon)
      if (nm == colon)
	nm++;
      else
	{
	  drive = tolower (colon[-1]) - 'a';
	  nm = colon + 1;
811
	  if (!IS_DIRECTORY_SEP (*nm))
812 813 814 815
	    {
	      defdir = alloca (MAXPATHLEN + 1);
	      relpath = getdefdir (drive + 1, defdir);
	    }
816
	}       
817
  }
818
#endif /* DOS_NT */
819

Jim Blandy's avatar
Jim Blandy committed
820 821 822
  /* If nm is absolute, flush ...// and detect /./ and /../.
     If no /./ or /../ we can return right away. */
  if (
823
      IS_DIRECTORY_SEP (nm[0])
Jim Blandy's avatar
Jim Blandy committed
824 825 826 827 828
#ifdef VMS
      || index (nm, ':')
#endif /* VMS */
      )
    {
829 830 831 832 833 834 835 836
      /* 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
837 838 839
      p = nm;
      while (*p)
	{
840 841 842 843 844
	  /* 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.  */
845
	  if (IS_DIRECTORY_SEP (p[0]) && IS_DIRECTORY_SEP (p[1])
Jim Blandy's avatar
Jim Blandy committed
846 847 848 849
#ifdef APOLLO
	      /* // at start of filename is meaningful on Apollo system */
	      && nm != p
#endif /* APOLLO */
850 851 852 853
#ifdef WINDOWSNT
	      /* \\ or // at the start of a pathname is meaningful on NT.  */
	      && nm != p
#endif /* WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
854 855
	      )
	    nm = p + 1;
856 857

	  /* "~" is hairy as the start of any path element.  */
858
	  if (IS_DIRECTORY_SEP (p[0]) && p[1] == '~')
Jim Blandy's avatar
Jim Blandy committed
859
	    nm = p + 1, lose = 1;
860 861

	  /* "." and ".." are hairy.  */
862
	  if (IS_DIRECTORY_SEP (p[0])
863
	      && p[1] == '.'
864
	      && (IS_DIRECTORY_SEP (p[2])
865
		  || p[2] == 0
866
		  || (p[2] == '.' && (IS_DIRECTORY_SEP (p[3])
867
				      || p[3] == 0))))
Jim Blandy's avatar
Jim Blandy committed
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
	    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)
	      {
887
		if (dots < 2)   /* this is to allow negative version numbers */
Jim Blandy's avatar
Jim Blandy committed
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
		  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 */
950
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
951 952 953
	  if (nm == XSTRING (name)->data)
	    return name;
	  return build_string (nm);
954
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
955 956 957 958 959 960 961 962
	}
    }

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

  newdir = 0;

  if (nm[0] == '~')		/* prefix ~ */
963
    {
964
      if (IS_DIRECTORY_SEP (nm[1])
Jim Blandy's avatar
Jim Blandy committed
965
#ifdef VMS
966
	  || nm[1] == ':'
967
#endif /* VMS */
968 969 970 971
	  || nm[1] == 0)	/* ~ by itself */
	{
	  if (!(newdir = (unsigned char *) egetenv ("HOME")))
	    newdir = (unsigned char *) "";
972
#ifdef DOS_NT
973 974
	  dostounix_filename (newdir);
#endif
975
	  nm++;
Jim Blandy's avatar
Jim Blandy committed
976
#ifdef VMS
977
	  nm++;			/* Don't leave the slash in nm.  */
978
#endif /* VMS */
979 980 981
	}
      else			/* ~user/filename */
	{
982
	  for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)
Jim Blandy's avatar
Jim Blandy committed
983
#ifdef VMS
984
			      && *p != ':'
985
#endif /* VMS */
986 987 988 989 990
			      ); p++);
	  o = (unsigned char *) alloca (p - nm + 1);
	  bcopy ((char *) nm, o, p - nm);
	  o [p - nm] = 0;

991 992 993 994
#ifdef  WINDOWSNT
	  newdir = (unsigned char *) egetenv ("HOME");
	  dostounix_filename (newdir);
#else  /* not WINDOWSNT */
995 996 997 998
	  pw = (struct passwd *) getpwnam (o + 1);
	  if (pw)
	    {
	      newdir = (unsigned char *) pw -> pw_dir;
Jim Blandy's avatar
Jim Blandy committed
999
#ifdef VMS
1000
	      nm = p + 1;	/* skip the terminator */
Jim Blandy's avatar
Jim Blandy committed
1001
#else
1002
	      nm = p;
1003
#endif /* VMS */
1004
	    }
1005
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1006

1007 1008 1009 1010
	  /* 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
1011

1012
  if (!IS_ANY_SEP (nm[0])
Jim Blandy's avatar
Jim Blandy committed
1013 1014 1015
#ifdef VMS
      && !index (nm, ':')
#endif /* not VMS */
1016
#ifdef DOS_NT
1017
      && drive == -1
1018
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1019 1020 1021 1022 1023
      && !newdir)
    {
      newdir = XSTRING (defalt)->data;
    }

1024
#ifdef DOS_NT
1025 1026
  if (newdir == 0 && relpath)
    newdir = defdir; 
1027
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1028 1029 1030 1031
  if (newdir != 0)
    {
      /* Get rid of any slash at the end of newdir.  */
      int length = strlen (newdir);
1032 1033 1034
      /* 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.  */
1035 1036 1037
#ifdef MSDOS
      if (newdir[1] != ':' && length > 1)
#endif
1038
      if (IS_DIRECTORY_SEP (newdir[length - 1]))
Jim Blandy's avatar
Jim Blandy committed
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	{
	  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
1049

Jim Blandy's avatar
Jim Blandy committed
1050 1051
  /* Now concatenate the directory and name to new space in the stack frame */
  tlen += strlen (nm) + 1;
1052 1053 1054 1055 1056 1057
#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
1058
  target = (unsigned char *) alloca (tlen);
1059
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
1060 1061 1062 1063 1064
  *target = 0;

  if (newdir)
    {
#ifndef VMS
1065
      if (nm[0] == 0 || IS_DIRECTORY_SEP (nm[0]))
Jim Blandy's avatar
Jim Blandy committed
1066 1067 1068
	strcpy (target, newdir);
      else
#endif
1069
	file_name_as_directory (target, newdir);
Jim Blandy's avatar
Jim Blandy committed
1070 1071 1072 1073 1074 1075 1076 1077
    }

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

1078
  /* Now canonicalize by removing /. and /foo/.. if they appear.  */
Jim Blandy's avatar
Jim Blandy committed
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

  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] != '<');
1110
	  if (p[1] == '.')      /* foo.-.bar ==> bar.  */
Jim Blandy's avatar
Jim Blandy committed
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
	    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 */
1127 1128
      if (!IS_DIRECTORY_SEP (*p))
	{
Jim Blandy's avatar
Jim Blandy committed
1129 1130
	  *o++ = *p++;
	}
1131 1132 1133
#ifdef WINDOWSNT
      else if (!strncmp (p, "\\\\", 2) || !strncmp (p, "//", 2))
#else  /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1134
      else if (!strncmp (p, "//", 2)
1135
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1136 1137 1138 1139
#ifdef APOLLO
	       /* // at start of filename is meaningful in Apollo system */
	       && o != target
#endif /* APOLLO */
1140 1141 1142 1143
#ifdef WINDOWSNT
	       /* \\ at start of filename is meaningful in Windows-NT */
	       && o != target
#endif /* WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1144 1145 1146 1147 1148
	       )
	{
	  o = target;
	  p++;
	}
1149
      else if (IS_DIRECTORY_SEP (p[0])
1150
	       && p[1] == '.'
1151
	       && (IS_DIRECTORY_SEP (p[2])
1152 1153 1154 1155 1156 1157 1158 1159
		   || 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;
	}
1160 1161 1162
#ifdef WINDOWSNT
      else if (!strncmp (p, "\\..", 3) || !strncmp (p, "/..", 3))
#else  /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1163
      else if (!strncmp (p, "/..", 3)
1164
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
1165 1166
	       /* `/../' is the "superroot" on certain file systems.  */
	       && o != target
1167
	       && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0))
Jim Blandy's avatar
Jim Blandy committed
1168
	{
1169
	  while (o != target && (--o) && !IS_DIRECTORY_SEP (*o))
Jim Blandy's avatar
Jim Blandy committed
1170 1171 1172 1173 1174 1175
	    ;
#ifdef APOLLO
	  if (o == target + 1 && o[-1] == '/' && o[0] == '/')
	    ++o;
	  else
#endif /* APOLLO */
1176 1177 1178 1179 1180 1181 1182
#ifdef WINDOWSNT
	  if (o == target + 1 && (o[-1] == '/' && o[0] == '/')
	      || (o[-1] == '\\' && o[0] == '\\'))
	    ++o;
	  else
#endif /* WINDOWSNT */
	  if (o == target && IS_ANY_SEP (*o))
Jim Blandy's avatar
Jim Blandy committed
1183 1184 1185 1186
	    ++o;
	  p += 3;
	}
      else
1187
	{
Jim Blandy's avatar
Jim Blandy committed
1188 1189 1190 1191 1192
	  *o++ = *p++;
	}
#endif /* not VMS */
    }

1193
#ifdef DOS_NT
1194
  /* at last, set drive name. */
1195 1196 1197 1198 1199 1200
  if (target[1] != ':'
#ifdef WINDOWSNT
      /* Allow network paths that look like "\\foo" */
      && !(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))
#endif /* WINDOWSNT */
      )
1201 1202 1203 1204 1205
    {
      target -= 2;
      target[0] = (drive < 0 ? getdisk () : drive) + 'a';
      target[1] = ':';
    }
1206
#endif /* DOS_NT */
1207

Jim Blandy's avatar
Jim Blandy committed
1208 1209
  return make_string (target, o - target);
}
1210

Jim Blandy's avatar
Jim Blandy committed
1211
#if 0
1212
/* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'.  */
Jim Blandy's avatar
Jim Blandy committed
1213
DEAFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
  "Convert FILENAME to absolute, and canonicalize it.\n\
Second arg DEFAULT is directory to start with if FILENAME is relative\n\
 (does not start with slash); if DEFAULT is nil or missing,\n\
the current buffer's value of default-directory is used.\n\
Filenames containing `.' or `..' as components are simplified;\n\
initial `~/' expands to your home directory.\n\
See also the function `substitute-in-file-name'.")
     (name, defalt)
     Lisp_Object name, defalt;
{
  unsigned char *nm;
  
  register unsigned char *newdir, *p, *o;
  int tlen;
  unsigned char *target;
  struct passwd *pw;
  int lose;
#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 */
  
  CHECK_STRING (name, 0);

#ifdef VMS
  /* Filenames on VMS are always upper case.  */
  name = Fupcase (name);
#endif

  nm = XSTRING (name)->data;
  
  /* If nm is absolute, flush ...// and detect /./ and /../.
     If no /./ or /../ we can return right away. */
  if (
      nm[0] == '/'
#ifdef VMS
      || index (nm, ':')
#endif /* VMS */
      )
    {
      p = nm;
      lose = 0;
      while (*p)
	{
	  if (p[0] == '/' && p[1] == '/'
#ifdef APOLLO
	      /* // at start of filename is meaningful on Apollo system */
	      && nm != p
#endif /* APOLLO */
	      )
	    nm = p + 1;
	  if (p[0] == '/' && p[1] == '~')
	    nm = p + 1, lose = 1;
	  if (p[0] == '/' && p[1] == '.'
	      && (p[2] == '/' || p[2] == 0
		  || (p[2] == '.' && (p[3] == '/' || p[3] == 0))))
	    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)
	      {
1293
		if (dots < 2)   /* this is to allow negative version numbers */
Jim Blandy's avatar
Jim Blandy committed
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 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
		  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] == '.')