view src/dired.c @ 826:6728e641994e

[xemacs-hg @ 2002-05-05 11:30:15 by ben] syntax cache, 8-bit-format, lots of code cleanup README.packages: Update info about --package-path. i.c: Create an inheritable event and pass it on to XEmacs, so that ^C can be handled properly. Intercept ^C and signal the event. "Stop Build" in VC++ now works. bytecomp-runtime.el: Doc string changes. compat.el: Some attempts to redo this to make it truly useful and fix the "multiple versions interacting with each other" problem. Not yet done. Currently doesn't work. files.el: Use with-obsolete-variable to avoid warnings in new revert-buffer code. xemacs.mak: Split up CFLAGS into a version without flags specifying the C library. The problem seems to be that minitar depends on zlib, which depends specifically on libc.lib, not on any of the other C libraries. Unless you compile with libc.lib, you get errors -- specifically, no _errno in the other libraries, which must make it something other than an int. (#### But this doesn't seem to obtain in XEmacs, which also uses zlib, and can be linked with any of the C libraries. Maybe zlib is used differently and doesn't need errno, or maybe XEmacs provides an int errno; ... I don't understand. Makefile.in.in: Fix so that packages are around when testing. abbrev.c, alloc.c, buffer.c, buffer.h, bytecode.c, callint.c, casefiddle.c, casetab.c, casetab.h, charset.h, chartab.c, chartab.h, cmds.c, console-msw.h, console-stream.c, console-x.c, console.c, console.h, data.c, device-msw.c, device.c, device.h, dialog-msw.c, dialog-x.c, dired-msw.c, dired.c, doc.c, doprnt.c, dumper.c, editfns.c, elhash.c, emacs.c, eval.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, events.c, events.h, extents.c, extents.h, faces.c, file-coding.c, file-coding.h, fileio.c, fns.c, font-lock.c, frame-gtk.c, frame-msw.c, frame-x.c, frame.c, frame.h, glade.c, glyphs-gtk.c, glyphs-msw.c, glyphs-msw.h, glyphs-x.c, glyphs.c, glyphs.h, gui-msw.c, gui-x.c, gui.h, gutter.h, hash.h, indent.c, insdel.c, intl-win32.c, intl.c, keymap.c, lisp-disunion.h, lisp-union.h, lisp.h, lread.c, lrecord.h, lstream.c, lstream.h, marker.c, menubar-gtk.c, menubar-msw.c, menubar-x.c, menubar.c, minibuf.c, mule-ccl.c, mule-charset.c, mule-coding.c, mule-wnnfns.c, nas.c, objects-msw.c, objects-x.c, opaque.c, postgresql.c, print.c, process-nt.c, process-unix.c, process.c, process.h, profile.c, rangetab.c, redisplay-gtk.c, redisplay-msw.c, redisplay-output.c, redisplay-x.c, redisplay.c, redisplay.h, regex.c, regex.h, scrollbar-msw.c, search.c, select-x.c, specifier.c, specifier.h, symbols.c, symsinit.h, syntax.c, syntax.h, syswindows.h, tests.c, text.c, text.h, tooltalk.c, ui-byhand.c, ui-gtk.c, unicode.c, win32.c, window.c: Another big Ben patch. -- FUNCTIONALITY CHANGES: add partial support for 8-bit-fixed, 16-bit-fixed, and 32-bit-fixed formats. not quite done yet. (in particular, needs functions to actually convert the buffer.) NOTE: lots of changes to regex.c here. also, many new *_fmt() inline funs that take an Internal_Format argument. redo syntax cache code. make the cache per-buffer; keep the cache valid across calls to functions that use it. also keep it valid across insertions/deletions and extent changes, as much as is possible. eliminate the junky regex-reentrancy code by passing in the relevant lisp info to the regex routines as local vars. add general mechanism in extents code for signalling extent changes. fix numerous problems with the case-table implementation; yoshiki never properly transferred many algorithms from old-style to new-style case tables. redo char tables to support a default argument, so that mapping only occurs over changed args. change many chartab functions to accept Lisp_Object instead of Lisp_Char_Table *. comment out the code in font-lock.c by default, because font-lock.el no longer uses it. we should consider eliminating it entirely. Don't output bell as ^G in console-stream when not a TTY. add -mswindows-termination-handle to interface with i.c, so we can properly kill a build. add more error-checking to buffer/string macros. add some additional buffer_or_string_() funs. -- INTERFACE CHANGES AFFECTING MORE CODE: switch the arguments of write_c_string and friends to be consistent with write_fmt_string, which must have printcharfun first. change BI_* macros to BYTE_* for increased clarity; similarly for bi_* local vars. change VOID_TO_LISP to be a one-argument function. eliminate no-longer-needed CVOID_TO_LISP. -- char/string macro changes: rename MAKE_CHAR() to make_emchar() for slightly less confusion with make_char(). (The former generates an Emchar, the latter a Lisp object. Conceivably we should rename make_char() -> wrap_char() and similarly for make_int(), make_float().) Similar changes for other *CHAR* macros -- we now consistently use names with `emchar' whenever we are working with Emchars. Any remaining name with just `char' always refers to a Lisp object. rename macros with XSTRING_* to string_* except for those that reference actual fields in the Lisp_String object, following conventions used elsewhere. rename set_string_{data,length} macros (the only ones to work with a Lisp_String_* instead of a Lisp_Object) to set_lispstringp_* to make the difference clear. try to be consistent about caps vs. lowercase in macro/inline-fun names for chars and such, which wasn't the case before. we now reserve caps either for XFOO_ macros that reference object fields (e.g. XSTRING_DATA) or for things that have non-function semantics, e.g. directly modifying an arg (BREAKUP_EMCHAR) or evaluating an arg (any arg) more than once. otherwise, use lowercase. here is a summary of most of the macros/inline funs changed by all of the above changes: BYTE_*_P -> byte_*_p XSTRING_BYTE -> string_byte set_string_data/length -> set_lispstringp_data/length XSTRING_CHAR_LENGTH -> string_char_length XSTRING_CHAR -> string_emchar INTBYTE_FIRST_BYTE_P -> intbyte_first_byte_p INTBYTE_LEADING_BYTE_P -> intbyte_leading_byte_p charptr_copy_char -> charptr_copy_emchar LEADING_BYTE_* -> leading_byte_* CHAR_* -> EMCHAR_* *_CHAR_* -> *_EMCHAR_* *_CHAR -> *_EMCHAR CHARSET_BY_ -> charset_by_* BYTE_SHIFT_JIS* -> byte_shift_jis* BYTE_BIG5* -> byte_big5* REP_BYTES_BY_FIRST_BYTE -> rep_bytes_by_first_byte char_to_unicode -> emchar_to_unicode valid_char_p -> valid_emchar_p Change intbyte_strcmp -> qxestrcmp_c (duplicated functionality). -- INTERFACE CHANGES AFFECTING LESS CODE: use DECLARE_INLINE_HEADER in various places. remove '#ifdef emacs' from XEmacs-only files. eliminate CHAR_TABLE_VALUE(), which duplicated the functionality of get_char_table(). add BUFFER_TEXT_LOOP to simplify iterations over buffer text. define typedefs for signed and unsigned types of fixed sizes (INT_32_BIT, UINT_32_BIT, etc.). create ALIGN_FOR_TYPE as a higher-level interface onto ALIGN_SIZE; fix code to use it. add charptr_emchar_len to return the text length of the character pointed to by a ptr; use it in place of charcount_to_bytecount(..., 1). add emchar_len to return the text length of a given character. add types Bytexpos and Charxpos to generalize Bytebpos/Bytecount and Charbpos/Charcount, in code (particularly, the extents code and redisplay code) that works with either kind of index. rename redisplay struct params with names such as `charbpos' to e.g. `charpos' when they are e.g. a Charxpos, not a Charbpos. eliminate xxDEFUN in place of DEFUN; no longer necessary with changes awhile back to doc.c. split up big ugly combined list of EXFUNs in lisp.h on a file-by-file basis, since other prototypes are similarly split. rewrite some "*_UNSAFE" macros as inline funs and eliminate the _UNSAFE suffix. move most string code from lisp.h to text.h; the string code and text.h code is now intertwined in such a fashion that they need to be in the same place and partially interleaved. (you can't create forward references for inline funs) automated/lisp-tests.el, automated/symbol-tests.el, automated/test-harness.el: Fix test harness to output FAIL messages to stderr when in batch mode. Fix up some problems in lisp-tests/symbol-tests that were causing spurious failures.
author ben
date Sun, 05 May 2002 11:33:57 +0000
parents a634e3b7acc8
children e7ee5f8bde58
line wrap: on
line source

 /* Lisp functions for making directory listings.
   Copyright (C) 1985, 1986, 1992, 1993, 1994 Free Software Foundation, Inc.
   Copyright (C) 2001, 2002 Ben Wing.

This file is part of XEmacs.

XEmacs 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.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.30. */

#include <config.h>
#include "lisp.h"

#include "buffer.h"
#include "commands.h"
#include "elhash.h"
#include "opaque.h"
#include "regex.h"
#include "syntax.h"
#include "sysdep.h"

#include "sysdir.h"
#include "sysfile.h"
#include "syspwd.h"
#include "systime.h"

#ifdef WIN32_NATIVE
#include "syswindows.h"
#endif

Lisp_Object Vcompletion_ignored_extensions;
Lisp_Object Qdirectory_files;
Lisp_Object Qfile_name_completion;
Lisp_Object Qfile_name_all_completions;
Lisp_Object Qfile_attributes;

static Lisp_Object
close_directory_unwind (Lisp_Object unwind_obj)
{
  DIR *d = (DIR *)get_opaque_ptr (unwind_obj);
  qxe_closedir (d);
  free_opaque_ptr (unwind_obj);
  return Qnil;
}

DEFUN ("directory-files", Fdirectory_files, 1, 5, 0, /*
Return a list of names of files in DIRECTORY.
There are four optional arguments:
If FULL is non-nil, absolute pathnames of the files are returned.
If MATCH is non-nil, only pathnames containing that regexp are returned.
If NOSORT is non-nil, the list is not sorted--its order is unpredictable.
 NOSORT is useful if you plan to sort the result yourself.
If FILES-ONLY is the symbol t, then only the "files" in the directory
 will be returned; subdirectories will be excluded.  If FILES-ONLY is not
 nil and not t, then only the subdirectories will be returned.  Otherwise,
 if FILES-ONLY is nil (the default) then both files and subdirectories will
 be returned.
*/
       (directory, full, match, nosort, files_only))
{
  /* This function can GC */
  DIR *d;
  Lisp_Object list = Qnil;
  Bytecount directorylen;
  Lisp_Object handler;
  struct re_pattern_buffer *bufp = NULL;
  int speccount = specpdl_depth ();
  Intbyte *statbuf, *statbuf_tail;

  struct gcpro gcpro1, gcpro2;
  GCPRO2 (directory, list);

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (directory, Qdirectory_files);
  if (!NILP (handler))
    {
      UNGCPRO;
      if (!NILP (files_only))
	return call6 (handler, Qdirectory_files, directory, full, match,
		      nosort, files_only);
      else
	return call5 (handler, Qdirectory_files, directory, full, match,
		      nosort);
    }

  /* #### why do we do Fexpand_file_name after file handlers here,
     but earlier everywhere else? */
  directory = Fexpand_file_name (directory, Qnil);
  directory = Ffile_name_as_directory (directory);
  directorylen = XSTRING_LENGTH (directory);

  statbuf = (Intbyte *) alloca (directorylen + MAXNAMLEN + 1);
  memcpy (statbuf, XSTRING_DATA (directory), directorylen);
  statbuf_tail = statbuf + directorylen;

  /* XEmacs: this should come after Ffile_name_as_directory() to avoid
     potential regexp cache smashage.  It comes before the opendir()
     because it might signal an error.  */
  if (!NILP (match))
    {
      CHECK_STRING (match);

      /* MATCH might be a flawed regular expression.  Rather than
	 catching and signalling our own errors, we just call
	 compile_pattern to do the work for us.  */
      bufp = compile_pattern (match, 0, Qnil, Qnil, 0, 0, ERROR_ME);
    }

  /* Now *bufp is the compiled form of MATCH; don't call anything
     which might compile a new regexp until we're done with the loop!  */

  /* Do this opendir after anything which might signal an error.
     NOTE: the above comment is old; previously, there was no
     unwind-protection in case of error, but now there is.  */
  d = qxe_opendir (XSTRING_DATA (directory));
  if (!d)
    report_file_error ("Opening directory", directory);

  record_unwind_protect (close_directory_unwind, make_opaque_ptr ((void *)d));

  /* Loop reading blocks */
  while (1)
    {
      DIRENTRY *dp = qxe_readdir (d);
      int len;
      struct syntax_cache scache_struct;
      struct syntax_cache *scache = &scache_struct;

      if (!dp)
	break;
      len = NAMLEN (dp);
      if (DIRENTRY_NONEMPTY (dp)
	  && (NILP (match)
	      || (0 <= re_search (bufp, dp->d_name, len, 0, len, 0, Qnil, 0,
				  scache))))
	{
	  if (!NILP (files_only))
	    {
	      struct stat st;
	      int dir_p = 0;

	      memcpy (statbuf_tail, dp->d_name, len);
	      statbuf_tail[len] = 0;

	      if (qxe_stat (statbuf, &st) == 0
		  && (st.st_mode & S_IFMT) == S_IFDIR)
		dir_p = 1;

	      if (EQ (files_only, Qt) && dir_p)
		continue;
	      else if (!EQ (files_only, Qt) && !dir_p)
		continue;
	    }

	  {
	    Lisp_Object name =
	      make_string ((Intbyte *)dp->d_name, len);
	    if (!NILP (full))
	      name = concat2 (directory, name);

	    list = Fcons (name, list);
	  }
	}
    }
  unbind_to (speccount);	/* This will close the dir */

  if (NILP (nosort))
    list = Fsort (Fnreverse (list), Qstring_lessp);

  RETURN_UNGCPRO (list);
}

static Lisp_Object file_name_completion (Lisp_Object file,
                                         Lisp_Object directory,
                                         int all_flag, int ver_flag);

DEFUN ("file-name-completion", Ffile_name_completion, 2, 2, 0, /*
Complete file name PARTIAL-FILENAME in directory DIRECTORY.
Return the longest prefix common to all file names in DIRECTORY
that start with PARTIAL-FILENAME.
If there is only one and PARTIAL-FILENAME matches it exactly, return t.
Return nil if DIRECTORY contains no name starting with PARTIAL-FILENAME.

File names which end with any member of `completion-ignored-extensions'
are not considered as possible completions for PARTIAL-FILENAME unless
there is no other possible completion. `completion-ignored-extensions'
is not applied to the names of directories.
*/
       (partial_filename, directory))
{
  /* This function can GC.  GC checked 1996.04.06. */
  Lisp_Object handler;

  /* If the directory name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (directory, Qfile_name_completion);
  if (!NILP (handler))
    return call3 (handler, Qfile_name_completion, partial_filename, directory);

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (partial_filename, Qfile_name_completion);
  if (!NILP (handler))
    return call3 (handler, Qfile_name_completion, partial_filename, directory);

  return file_name_completion (partial_filename, directory, 0, 0);
}

DEFUN ("file-name-all-completions", Ffile_name_all_completions, 2, 2, 0, /*
Return a list of all completions of PARTIAL-FILENAME in DIRECTORY.
These are all file names in DIRECTORY which begin with PARTIAL-FILENAME.
*/
       (partial_filename, directory))
{
  /* This function can GC. GC checked 1997.06.04. */
  Lisp_Object handler;
  struct gcpro gcpro1;

  GCPRO1 (directory);
  directory = Fexpand_file_name (directory, Qnil);
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (directory, Qfile_name_all_completions);
  UNGCPRO;
  if (!NILP (handler))
    return call3 (handler, Qfile_name_all_completions, partial_filename,
		  directory);

  return file_name_completion (partial_filename, directory, 1, 0);
}

static int
file_name_completion_stat (Lisp_Object directory, DIRENTRY *dp,
			   struct stat *st_addr)
{
  Bytecount len = NAMLEN (dp);
  Bytecount pos = XSTRING_LENGTH (directory);
  int value;
  Intbyte *fullname = (Intbyte *) alloca (len + pos + 2);

  memcpy (fullname, XSTRING_DATA (directory), pos);
  if (!IS_DIRECTORY_SEP (fullname[pos - 1]))
    fullname[pos++] = DIRECTORY_SEP;

  memcpy (fullname + pos, dp->d_name, len);
  fullname[pos + len] = 0;

#ifdef S_IFLNK
  /* We want to return success if a link points to a nonexistent file,
     but we want to return the status for what the link points to,
     in case it is a directory.  */
  value = qxe_lstat (fullname, st_addr);
  if (S_ISLNK (st_addr->st_mode))
    qxe_stat (fullname, st_addr);
#else
  value = qxe_stat (fullname, st_addr);
#endif
  return value;
}

static Lisp_Object
file_name_completion_unwind (Lisp_Object locative)
{
  DIR *d;
  Lisp_Object obj = XCAR (locative);

  if (!NILP (obj))
    {
      d = (DIR *)get_opaque_ptr (obj);
      qxe_closedir (d);
      free_opaque_ptr (obj);
    }
  free_cons (XCONS (locative));
  return Qnil;
}

static Lisp_Object
file_name_completion (Lisp_Object file, Lisp_Object directory, int all_flag,
		      int ver_flag)
{
  /* This function can GC */
  DIR *d = 0;
  int matchcount = 0;
  Lisp_Object bestmatch = Qnil;
  Charcount bestmatchsize = 0;
  struct stat st;
  int passcount;
  int speccount = specpdl_depth ();
  Charcount file_name_length;
  Lisp_Object locative;
  struct gcpro gcpro1, gcpro2, gcpro3;

  GCPRO3 (file, directory, bestmatch);

  CHECK_STRING (file);

#ifdef WIN32_NATIVE
  /* Filename completion on Windows ignores case, since Windows
     filesystems do.  */
  specbind (Qcompletion_ignore_case, Qt);
#endif /* WIN32_NATIVE */

#ifdef FILE_SYSTEM_CASE
  file = FILE_SYSTEM_CASE (file);
#endif
  directory = Fexpand_file_name (directory, Qnil);
  file_name_length = string_char_length (file);

  /* With passcount = 0, ignore files that end in an ignored extension.
     If nothing found then try again with passcount = 1, don't ignore them.
     If looking for all completions, start with passcount = 1,
     so always take even the ignored ones.

     ** It would not actually be helpful to the user to ignore any possible
     completions when making a list of them.**  */

  /* We cannot use close_directory_unwind() because we change the
     directory.  The old code used to just avoid signaling errors, and
     call closedir, but it was wrong, because it made sane handling of
     QUIT impossible and, besides, various utility functions like
     regexp_ignore_completion_p can signal errors.  */
  locative = noseeum_cons (Qnil, Qnil);
  record_unwind_protect (file_name_completion_unwind, locative);

  for (passcount = !!all_flag; NILP (bestmatch) && passcount < 2; passcount++)
    {
      d = qxe_opendir (XSTRING_DATA (Fdirectory_file_name (directory)));
      if (!d)
	report_file_error ("Opening directory", directory);
      XCAR (locative) = make_opaque_ptr ((void *)d);

      /* Loop reading blocks */
      while (1)
	{
	  DIRENTRY *dp;
	  Bytecount len;
	  /* scmp() works in characters, not bytes, so we have to compute
	     this value: */
	  Charcount cclen;
          int directoryp;
          int ignored_extension_p = 0;
	  Intbyte *d_name;

	  dp = qxe_readdir (d);
	  if (!dp) break;

	  /* Cast to Intbyte* is OK, as qxe_readdir() Mule-encapsulates.  */
	  d_name = (Intbyte *) dp->d_name;
	  len = NAMLEN (dp);
	  cclen = bytecount_to_charcount (d_name, len);

	  QUIT;

	  if (! DIRENTRY_NONEMPTY (dp)
	      || cclen < file_name_length
	      || 0 <= scmp (d_name, XSTRING_DATA (file), file_name_length))
	    continue;

          if (file_name_completion_stat (directory, dp, &st) < 0)
            continue;

          directoryp = ((st.st_mode & S_IFMT) == S_IFDIR);
          if (directoryp)
	    {
#ifndef TRIVIAL_DIRECTORY_ENTRY
#define TRIVIAL_DIRECTORY_ENTRY(n) (!strcmp (n, ".") || !strcmp (n, ".."))
#endif
	      /* "." and ".." are never interesting as completions, but are
		 actually in the way in a directory containing only one file.  */
	      if (!passcount && TRIVIAL_DIRECTORY_ENTRY (dp->d_name))
		continue;
	    }
	  else
            {
	      /* Compare extensions-to-be-ignored against end of this file name */
	      /* if name is not an exact match against specified string.  */
	      if (!passcount && cclen > file_name_length)
		{
		  Lisp_Object tem;
		  /* and exit this for loop if a match is found */
		  EXTERNAL_LIST_LOOP (tem, Vcompletion_ignored_extensions)
		    {
		      Lisp_Object elt = XCAR (tem);
		      Charcount skip;

		      CHECK_STRING (elt);

		      skip = cclen - string_char_length (elt);
		      if (skip < 0) continue;

		      if (0 > scmp (charptr_n_addr (d_name, skip),
				    XSTRING_DATA (elt),
				    string_char_length (elt)))
			{
			  ignored_extension_p = 1;
			  break;
			}
		    }
		}
	    }

	  /* If an ignored-extensions match was found,
	     don't process this name as a completion.  */
	  if (!passcount && ignored_extension_p)
	    continue;

	  if (!passcount && regexp_ignore_completion_p (d_name, Qnil, 0, len))
            continue;

          /* Update computation of how much all possible completions match */
          matchcount++;

          if (all_flag || NILP (bestmatch))
            {
              Lisp_Object name = Qnil;
              struct gcpro ngcpro1;
              NGCPRO1 (name);
              /* This is a possible completion */
              name = make_string (d_name, len);
              if (directoryp) /* Completion is a directory; end it with '/' */
                name = Ffile_name_as_directory (name);
              if (all_flag)
                {
                  bestmatch = Fcons (name, bestmatch);
                }
              else
                {
                  bestmatch = name;
                  bestmatchsize = string_char_length (name);
                }
              NUNGCPRO;
            }
          else
            {
              Charcount compare = min (bestmatchsize, cclen);
              Intbyte *p1 = XSTRING_DATA (bestmatch);
              Intbyte *p2 = d_name;
              Charcount matchsize = scmp (p1, p2, compare);

              if (matchsize < 0)
                matchsize = compare;
              if (completion_ignore_case)
                {
                  /* If this is an exact match except for case,
                     use it as the best match rather than one that is not
                     an exact match.  This way, we get the case pattern
                     of the actual match.  */
                  if ((matchsize == cclen
                       && matchsize + !!directoryp
                       < string_char_length (bestmatch))
                      ||
                      /* If there is no exact match ignoring case,
                         prefer a match that does not change the case
                         of the input.  */
                      (((matchsize == cclen)
                        ==
                        (matchsize + !!directoryp
                         == string_char_length (bestmatch)))
                       /* If there is more than one exact match aside from
                          case, and one of them is exact including case,
                          prefer that one.  */
                       && 0 > scmp_1 (p2, XSTRING_DATA (file),
				      file_name_length, 0)
                       && 0 <= scmp_1 (p1, XSTRING_DATA (file),
				       file_name_length, 0)))
                    {
                      bestmatch = make_string (d_name, len);
                      if (directoryp)
                        bestmatch = Ffile_name_as_directory (bestmatch);
                    }
                }

              /* If this directory all matches,
                 see if implicit following slash does too.  */
              if (directoryp
                  && compare == matchsize
                  && bestmatchsize > matchsize
                  && IS_ANY_SEP (charptr_emchar_n (p1, matchsize)))
                matchsize++;
              bestmatchsize = matchsize;
            }
        }
      qxe_closedir (d);
      free_opaque_ptr (XCAR (locative));
      XCAR (locative) = Qnil;
    }

  unbind_to (speccount);

  UNGCPRO;

  if (all_flag || NILP (bestmatch))
    return bestmatch;
  if (matchcount == 1 && bestmatchsize == file_name_length)
    return Qt;
  return Fsubstring (bestmatch, Qzero, make_int (bestmatchsize));
}


static Lisp_Object user_name_completion (Lisp_Object user,
                                         int all_flag,
                                         int *uniq);

DEFUN ("user-name-completion", Fuser_name_completion, 1, 1, 0, /*
Complete user name from PARTIAL-USERNAME.
Return the longest prefix common to all user names starting with
PARTIAL-USERNAME.  If there is only one and PARTIAL-USERNAME matches
it exactly, returns t.  Return nil if there is no user name starting
with PARTIAL-USERNAME.
*/
       (partial_username))
{
  return user_name_completion (partial_username, 0, NULL);
}

DEFUN ("user-name-completion-1", Fuser_name_completion_1, 1, 1, 0, /*
Complete user name from PARTIAL-USERNAME.

This function is identical to `user-name-completion', except that
the cons of the completion and an indication of whether the
completion was unique is returned.

The car of the returned value is the longest prefix common to all user
names that start with PARTIAL-USERNAME.  If there is only one and
PARTIAL-USERNAME matches it exactly, the car is t.  The car is nil if
there is no user name starting with PARTIAL-USERNAME.  The cdr of the
result is non-nil if and only if the completion returned in the car
was unique.
*/
       (partial_username))
{
  int uniq;
  Lisp_Object completed = user_name_completion (partial_username, 0, &uniq);
  return Fcons (completed, uniq ? Qt : Qnil);
}

DEFUN ("user-name-all-completions", Fuser_name_all_completions, 1, 1, 0, /*
Return a list of all user name completions from PARTIAL-USERNAME.
These are all the user names which begin with PARTIAL-USERNAME.
*/
       (partial_username))
{
  return user_name_completion (partial_username, 1, NULL);
}

struct user_name
{
  Intbyte *ptr;
  Bytecount len;
};

struct user_cache
{
  struct user_name *user_names;
  int length;
  int size;
  EMACS_TIME last_rebuild_time;
};
static struct user_cache user_cache;

static void
free_user_cache (struct user_cache *cache)
{
  int i;
  for (i = 0; i < cache->length; i++)
    xfree (cache->user_names[i].ptr);
  xfree (cache->user_names);
  xzero (*cache);
}

static Lisp_Object
user_name_completion_unwind (Lisp_Object cache_incomplete_p)
{
#ifndef WIN32_NATIVE
  endpwent ();
  speed_up_interrupts ();
#endif

  if (! NILP (XCAR (cache_incomplete_p)))
    free_user_cache (&user_cache);

  free_cons (XCONS (cache_incomplete_p));

  return Qnil;
}

#define  USER_CACHE_TTL  (24*60*60)  /* Time to live: 1 day, in seconds */

static Lisp_Object
user_name_completion (Lisp_Object user, int all_flag, int *uniq)
{
  /* This function can GC */
  int matchcount = 0;
  Lisp_Object bestmatch = Qnil;
  Charcount bestmatchsize = 0;
  Charcount user_name_length;
  EMACS_TIME t;
  int i;
  struct gcpro gcpro1, gcpro2;

  GCPRO2 (user, bestmatch);

  CHECK_STRING (user);

  user_name_length = string_char_length (user);

  /* Cache user name lookups because it tends to be quite slow.
   * Rebuild the cache occasionally to catch changes */
  EMACS_GET_TIME (t);
  if (user_cache.user_names &&
      (EMACS_SECS (t) - EMACS_SECS (user_cache.last_rebuild_time)
       > USER_CACHE_TTL))
    free_user_cache (&user_cache);

  if (!user_cache.user_names)
    {
#ifndef WIN32_NATIVE
      struct passwd *pwd;
#else
      DWORD entriesread;
      DWORD totalentries;
      DWORD resume_handle = 0;
#endif

      Lisp_Object cache_incomplete_p = noseeum_cons (Qt, Qnil);
      int speccount = specpdl_depth ();

      record_unwind_protect (user_name_completion_unwind, cache_incomplete_p);
#ifndef WIN32_NATIVE
      slow_down_interrupts ();
      setpwent ();
      while ((pwd = qxe_getpwent ()))
        {
          QUIT;
	  DO_REALLOC (user_cache.user_names, user_cache.size,
		      user_cache.length + 1, struct user_name);
	  user_cache.user_names[user_cache.length].ptr =
	    (Intbyte *) xstrdup (pwd->pw_name);
	  user_cache.user_names[user_cache.length].len = strlen (pwd->pw_name);
	  user_cache.length++;
        }
#else
      if (xNetUserEnum)
	{
	  do
	    {
	      USER_INFO_0 *bufptr;
	      NET_API_STATUS status_status_statui_statum_statu;
	      int i;

	      QUIT;
	      status_status_statui_statum_statu =
		xNetUserEnum (NULL, 0, 0, (LPBYTE *) &bufptr, 1024,
			      &entriesread, &totalentries, &resume_handle);
	      if (status_status_statui_statum_statu != NERR_Success &&
		  status_status_statui_statum_statu != ERROR_MORE_DATA)
		invalid_operation ("Error enumerating users",
				   make_int (GetLastError ()));
	      for (i = 0; i < (int) entriesread; i++)
		{
		  DO_REALLOC (user_cache.user_names, user_cache.size,
			      user_cache.length + 1, struct user_name);
		  TO_INTERNAL_FORMAT (C_STRING,
				      bufptr[i].usri0_name,
				      MALLOC,
				      (user_cache.
				       user_names[user_cache.length].ptr,
				       user_cache.
				       user_names[user_cache.length].len),
				      Qmswindows_unicode);
		  user_cache.length++;
		}
	      xNetApiBufferFree (bufptr);
	    }
	  while (entriesread != totalentries);
	}
      else /* Win 9x */
	{
	  Extbyte name[2 * (UNLEN + 1)];
	  DWORD length = sizeof (name);
	  
	  if (qxeGetUserName (name, &length))
	    {
	      DO_REALLOC (user_cache.user_names, user_cache.size,
			  user_cache.length + 1, struct user_name);
	      TO_INTERNAL_FORMAT (C_STRING, name,
				  MALLOC,
				  (user_cache.
				   user_names[user_cache.length].ptr,
				   user_cache.
				   user_names[user_cache.length].len),
				  Qmswindows_tstr);
	      user_cache.length++;
	    }
	}
#endif

      XCAR (cache_incomplete_p) = Qnil;
      unbind_to (speccount);

      EMACS_GET_TIME (user_cache.last_rebuild_time);
    }

  for (i = 0; i < user_cache.length; i++)
    {
      Intbyte *u_name = user_cache.user_names[i].ptr;
      Bytecount len   = user_cache.user_names[i].len;
      /* scmp() works in chars, not bytes, so we have to compute this: */
      Charcount cclen = bytecount_to_charcount (u_name, len);

      QUIT;

      if (cclen < user_name_length
	  || 0 <= scmp_1 (u_name, XSTRING_DATA (user), user_name_length, 0))
        continue;

      matchcount++;    /* count matching completions */

      if (all_flag || NILP (bestmatch))
        {
          Lisp_Object name = Qnil;
          struct gcpro ngcpro1;
          NGCPRO1 (name);
          /* This is a possible completion */
          name = make_string (u_name, len);
          if (all_flag)
            {
              bestmatch = Fcons (name, bestmatch);
            }
          else
            {
              bestmatch = name;
              bestmatchsize = string_char_length (name);
            }
          NUNGCPRO;
        }
      else
        {
          Charcount compare = min (bestmatchsize, cclen);
          Intbyte *p1 = XSTRING_DATA (bestmatch);
          Intbyte *p2 = u_name;
          Charcount matchsize = scmp_1 (p1, p2, compare, 0);

          if (matchsize < 0)
            matchsize = compare;

          bestmatchsize = matchsize;
        }
    }

  UNGCPRO;

  if (uniq)
    *uniq = (matchcount == 1);

  if (all_flag || NILP (bestmatch))
    return bestmatch;
  if (matchcount == 1 && bestmatchsize == user_name_length)
    return Qt;
  return Fsubstring (bestmatch, Qzero, make_int (bestmatchsize));
}


Lisp_Object
make_directory_hash_table (const Intbyte *path)
{
  DIR *d;
  if ((d = qxe_opendir (path)))
    {
      DIRENTRY *dp;
      Lisp_Object hash =
	make_lisp_hash_table (20, HASH_TABLE_NON_WEAK, HASH_TABLE_EQUAL);

      while ((dp = qxe_readdir (d)))
	{
	  Bytecount len = NAMLEN (dp);
	  if (DIRENTRY_NONEMPTY (dp))
	    /* Cast to Intbyte* is OK, as qxe_readdir() Mule-encapsulates.  */
	    Fputhash (make_string ((Intbyte *) dp->d_name, len), Qt, hash);
	}
      qxe_closedir (d);
      return hash;
    }
  else
    return Qnil;
}

#if 0
/* ... never used ... should use list2 directly anyway ... */
/* NOTE: This function can never return a negative value. */
Lisp_Object
wasteful_word_to_lisp (unsigned int item)
{
  /* Compatibility: in other versions, file-attributes returns a LIST
     of two 16 bit integers... */
  Lisp_Object cons = word_to_lisp (item);
  XCDR (cons) = Fcons (XCDR (cons), Qnil);
  return cons;
}
#endif

DEFUN ("file-attributes", Ffile_attributes, 1, 1, 0, /*
Return a list of attributes of file FILENAME.
Value is nil if specified file cannot be opened.
Otherwise, list elements are:
 0. t for directory, string (name linked to) for symbolic link, or nil.
 1. Number of links to file.
 2. File uid.
 3. File gid.
 4. Last access time, as a list of two integers.
  First integer has high-order 16 bits of time, second has low 16 bits.
 5. Last modification time, likewise.
 6. Last status change time, likewise.
 7. Size in bytes. (-1, if number is out of range).
 8. File modes, as a string of ten letters or dashes as in ls -l.
 9. t iff file's gid would change if file were deleted and recreated.
10. inode number.
11. Device number.

If file does not exist, returns nil.
*/
       (filename))
{
  /* This function can GC. GC checked 1997.06.04. */
  Lisp_Object values[12];
  Lisp_Object directory = Qnil;
  struct stat s;
  char modes[10];
  Lisp_Object handler;
  struct gcpro gcpro1, gcpro2;

  GCPRO2 (filename, directory);
  filename = Fexpand_file_name (filename, Qnil);

  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (filename, Qfile_attributes);
  if (!NILP (handler))
    {
      UNGCPRO;
      return call2 (handler, Qfile_attributes, filename);
    }

  if (qxe_lstat (XSTRING_DATA (filename), &s) < 0)
    {
      UNGCPRO;
      return Qnil;
    }

#ifdef BSD4_2
  directory = Ffile_name_directory (filename);
#endif

#if 0 /* #### shouldn't this apply to WIN32_NATIVE and maybe CYGWIN? */
  {
    Intbyte *tmpnam = XSTRING_DATA (Ffile_name_nondirectory (filename));
    Bytecount l = qxestrlen (tmpnam);

    if (l >= 5
	&& S_ISREG (s.st_mode)
	&& (qxestrcasecmp (&tmpnam[l - 4], ".com") == 0 ||
	    qxestrcasecmp (&tmpnam[l - 4], ".exe") == 0 ||
	    qxestrcasecmp (&tmpnam[l - 4], ".bat") == 0))
      {
	s.st_mode |= S_IEXEC;
      }
  }
#endif

  switch (s.st_mode & S_IFMT)
    {
    default:
      values[0] = Qnil;
      break;
    case S_IFDIR:
      values[0] = Qt;
      break;
#ifdef S_IFLNK
    case S_IFLNK:
      values[0] = Ffile_symlink_p (filename);
      break;
#endif
    }
  values[1] = make_int (s.st_nlink);
  values[2] = make_int (s.st_uid);
  values[3] = make_int (s.st_gid);
  values[4] = make_time (s.st_atime);
  values[5] = make_time (s.st_mtime);
  values[6] = make_time (s.st_ctime);
  values[7] = make_int ((EMACS_INT) s.st_size);
  /* If the size is out of range, give back -1.  */
  /* #### Fix when Emacs gets bignums! */
  if (XINT (values[7]) != s.st_size)
    values[7] = make_int (-1);
  filemodestring (&s, modes);
  values[8] = make_string ((Intbyte *) modes, 10);
#if defined (BSD4_2) || defined (BSD4_3)	/* file gid will be dir gid */
  {
    struct stat sdir;

    if (!NILP (directory) && qxe_stat (XSTRING_DATA (directory), &sdir) == 0)
      values[9] = (sdir.st_gid != s.st_gid) ? Qt : Qnil;
    else                        /* if we can't tell, assume worst */
      values[9] = Qt;
  }
#else                           /* file gid will be egid */
  values[9] = (s.st_gid != getegid ()) ? Qt : Qnil;
#endif	/* BSD4_2 or BSD4_3 */
  values[10] = make_int (s.st_ino);
  values[11] = make_int (s.st_dev);
  UNGCPRO;
  return Flist (countof (values), values);
}


/************************************************************************/
/*                            initialization                            */
/************************************************************************/

void
syms_of_dired (void)
{
  DEFSYMBOL (Qdirectory_files);
  DEFSYMBOL (Qfile_name_completion);
  DEFSYMBOL (Qfile_name_all_completions);
  DEFSYMBOL (Qfile_attributes);

  DEFSUBR (Fdirectory_files);
  DEFSUBR (Ffile_name_completion);
  DEFSUBR (Ffile_name_all_completions);
  DEFSUBR (Fuser_name_completion);
  DEFSUBR (Fuser_name_completion_1);
  DEFSUBR (Fuser_name_all_completions);
  DEFSUBR (Ffile_attributes);
}

void
vars_of_dired (void)
{
  DEFVAR_LISP ("completion-ignored-extensions", &Vcompletion_ignored_extensions /*
*Completion ignores filenames ending in any string in this list.
This variable does not affect lists of possible completions,
but does affect the commands that actually do completions.
It is used by the function `file-name-completion'.
*/ );
  Vcompletion_ignored_extensions = Qnil;
}