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- /* Lisp functions for making directory listings.
- Copyright (C) 1985, 1986 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Emacs is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <sys/stat.h>
-
- #include "config.h"
-
- #ifdef SYSV_SYSTEM_DIR
-
- #include <dirent.h>
- #define DIRENTRY struct dirent
- #define NAMLEN(p) strlen (p->d_name)
-
- #else
-
- #ifdef NONSYSTEM_DIR_LIBRARY
- #include "ndir.h"
- #else /* not NONSYSTEM_DIR_LIBRARY */
- #include <sys/dir.h>
- #endif /* not NONSYSTEM_DIR_LIBRARY */
-
- #define DIRENTRY struct direct
- #define NAMLEN(p) p->d_namlen
-
- extern DIR *opendir ();
- extern struct direct *readdir ();
-
- #endif
-
- #undef NULL
-
- #include "lisp.h"
- #include "buffer.h"
- #include "commands.h"
-
- #include "regex.h"
- #include "filetypes.h"
-
- #define min(a, b) ((a) < (b) ? (a) : (b))
-
- /* if system does not have symbolic links, it does not have lstat.
- In that case, use ordinary stat instead. */
-
- #ifndef S_IFLNK
- #define lstat stat
- #endif
-
- extern int completion_ignore_case;
-
- Lisp_Object Vcompletion_ignored_extensions;
-
- Lisp_Object Qcompletion_ignore_case;
-
- DEFUN ("directory-files", Fdirectory_files, Sdirectory_files, 1, 3, 0,
- "Return a list of names of files in DIRECTORY.\n\
- If FULL is non-NIL, absolute pathnames of the files are returned.\n\
- If MATCH is non-NIL, only pathnames containing that regexp are returned.")
- (dirname, full, match)
- Lisp_Object dirname, full, match;
- {
- DIR *d;
- char slashfilename[MAXNAMLEN+2];
- char *filename = slashfilename;
- int length;
- Lisp_Object list, name;
-
- /* In search.c */
- extern struct re_pattern_buffer searchbuf;
-
- if (!NULL (match))
- {
- CHECK_STRING (match, 3);
- /* Compile it now so we don't get an error after opendir */
- #ifdef VMS
- compile_pattern (match, &searchbuf, (char *) downcase_table);
- #else
- compile_pattern (match, &searchbuf, 0);
- #endif
- }
-
- dirname = Fexpand_file_name (dirname, Qnil);
- if (!(d = opendir (XSTRING (Fdirectory_file_name (dirname))->data)))
- report_file_error ("Opening directory", Fcons (dirname, Qnil));
-
- list = Qnil;
- length = XSTRING (dirname)->size;
- #ifndef VMS
- if (length == 0 || XSTRING (dirname)->data[length - 1] != '/')
- *filename++ = '/';
- #endif /* VMS */
-
- /* Loop reading blocks */
- while (1)
- {
- DIRENTRY *dp = readdir (d);
- int len;
-
- if (!dp) break;
- len = NAMLEN (dp);
- if (dp->d_ino)
- {
- strncpy (filename, dp->d_name, len);
- filename[len] = 0;
- if (NULL (match) ||
- (0 <= re_search (&searchbuf, filename, len, 0, len, 0)))
- {
- if (!NULL (full))
- name = concat2 (dirname, build_string (slashfilename));
- else
- name = build_string (filename);
- list = Fcons (name, list);
- }
- }
- }
- closedir (d);
- return Fsort (Fnreverse (list), Qstring_lessp);
- }
-
- Lisp_Object file_name_completion ();
-
- DEFUN ("file-name-completion", Ffile_name_completion, Sfile_name_completion,
- 2, 2, 0,
- "Complete file name FILE in directory DIR.\n\
- Returns the longest string common to all filenames in DIR\n\
- that start with FILE.\n\
- If there is only one and FILE matches it exactly, returns t.\n\
- Returns nil if DIR contains no name starting with FILE.")
- (file, dirname)
- Lisp_Object file, dirname;
- {
- /* Don't waste time trying to complete a null string.
- Besides, this case happens when user is being asked for
- a directory name and has supplied one ending in a /.
- We would not want to add anything in that case
- even if there are some unique characters in that directory. */
- if (XTYPE (file) == Lisp_String && XSTRING (file)->size == 0)
- return file;
- return file_name_completion (file, dirname, 0, 0);
- }
-
- DEFUN ("file-name-all-completions", Ffile_name_all_completions,
- Sfile_name_all_completions, 2, 2, 0,
- "Return a list of all completions of file name FILE in directory DIR.")
- (file, dirname)
- Lisp_Object file, dirname;
- {
- return file_name_completion (file, dirname, 1, 0);
- }
-
- #ifdef VMS
-
- DEFUN ("file-name-all-versions", Ffile_name_all_versions,
- Sfile_name_all_versions, 2, 2, 0,
- "Return a list of all versions of file name FILE in directory DIR.")
- (file, dirname)
- Lisp_Object file, dirname;
- {
- return file_name_completion (file, dirname, 1, 1);
- }
-
- #endif /* VMS */
-
- Lisp_Object
- file_name_completion (file, dirname, all_flag, ver_flag)
- Lisp_Object file, dirname;
- int all_flag, ver_flag;
- {
- DIR *d;
- int bestmatchsize, skip;
- register int compare, matchsize;
- unsigned char *p1, *p2;
- int matchcount = 0;
- Lisp_Object bestmatch, tem, elt, name;
- struct stat st;
- int directoryp;
- int passcount;
- int count = specpdl_ptr - specpdl;
- #ifdef VMS
- extern DIRENTRY * readdirver ();
-
- DIRENTRY *((* readfunc) ());
-
- /* Filename completion on VMS ignores case, since VMS filesys does. */
- specbind (Qcompletion_ignore_case, Qt);
-
- readfunc = readdir;
- if (ver_flag)
- readfunc = readdirver;
- file = Fupcase (file);
- #endif /* VMS */
-
- CHECK_STRING (file, 0);
-
- dirname = Fexpand_file_name (dirname, Qnil);
- bestmatch = Qnil;
-
- /* 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. */
- for (passcount = !!all_flag; NULL (bestmatch) && passcount < 2; passcount++)
- {
- if (!(d = opendir (XSTRING (Fdirectory_file_name (dirname))->data)))
- report_file_error ("Opening directory", Fcons (dirname, Qnil));
-
- /* Loop reading blocks */
- /* (att3b compiler bug requires do a null comparison this way) */
- while (1)
- {
- DIRENTRY *dp;
- int len;
-
- #ifdef VMS
- dp = (*readfunc) (d);
- #else
- dp = readdir (d);
- #endif
- if (!dp) break;
-
- len = NAMLEN (dp);
-
- if (!NULL (Vquit_flag) && NULL (Vinhibit_quit))
- goto quit;
- if (!dp->d_ino
- || len < XSTRING (file)->size
- || 0 <= scmp (dp->d_name, XSTRING (file)->data,
- XSTRING (file)->size))
- continue;
-
- if (file_name_completion_stat (dirname, dp, &st) < 0)
- continue;
-
- directoryp = ((st.st_mode & S_IFMT) == S_IFDIR);
- tem = Qnil;
- if (!directoryp)
- {
- /* Compare extensions-to-be-ignored against end of this file name */
- /* if name is not an exact match against specified string */
- if (!passcount && len > XSTRING (file)->size)
- /* and exit this for loop if a match is found */
- for (tem = Vcompletion_ignored_extensions;
- CONSP (tem); tem = XCONS (tem)->cdr)
- {
- elt = XCONS (tem)->car;
- if (XTYPE (elt) != Lisp_String) continue;
- skip = len - XSTRING (elt)->size;
- if (skip < 0) continue;
-
- if (0 <= scmp (dp->d_name + skip,
- XSTRING (elt)->data,
- XSTRING (elt)->size))
- continue;
- break;
- }
- }
-
- /* Unless an ignored-extensions match was found,
- process this name as a completion */
- if (passcount || !CONSP (tem))
- {
- /* Update computation of how much all possible completions match */
-
- matchcount++;
-
- if (all_flag || NULL (bestmatch))
- {
- /* This is a possible completion */
- if (directoryp)
- {
- /* This completion is a directory; make it end with '/' */
- name = Ffile_name_as_directory (make_string (dp->d_name, len));
- }
- else
- name = make_string (dp->d_name, len);
- if (all_flag)
- {
- bestmatch = Fcons (name, bestmatch);
- }
- else
- {
- bestmatch = name;
- bestmatchsize = XSTRING (name)->size;
- }
- }
- else
- {
- compare = min (bestmatchsize, len);
- p1 = XSTRING (bestmatch)->data;
- p2 = (unsigned char *) dp->d_name;
- 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 == len
- && matchsize < XSTRING (bestmatch)->size)
- ||
- /* If there is no exact match ignoring case,
- prefer a match that does not change the case
- of the input. */
- (((matchsize == len)
- ==
- (matchsize == XSTRING (bestmatch)->size))
- /* If there is more than one exact match aside from
- case, and one of them is exact including case,
- prefer that one. */
- && !bcmp (p2, XSTRING (file)->data, XSTRING (file)->size)
- && bcmp (p1, XSTRING (file)->data, XSTRING (file)->size)))
- {
- bestmatch = make_string (dp->d_name, len);
- if (directoryp)
- bestmatch = Ffile_name_as_directory (bestmatch);
- }
- }
- /* If this dirname all matches,
- see if implicit following slash does too. */
- if (directoryp
- && compare == matchsize
- && bestmatchsize > matchsize
- && p1[matchsize] == '/')
- matchsize++;
- bestmatchsize = matchsize;
- }
- }
- }
- closedir (d);
- }
-
- unbind_to (count);
-
- if (all_flag || NULL (bestmatch))
- return bestmatch;
-
- /* If we are ignoring case, and there is no exact match,
- and no additional text was supplied,
- don't change the case of what the user typed. */
- if (completion_ignore_case && bestmatchsize == XSTRING (file)->size
- && XSTRING (bestmatch)->size > bestmatchsize)
- return file;
-
- /* Return t if the supplied string is an exact match (counting case);
- it does not require any change to be made. */
- if (matchcount == 1 && bestmatchsize == XSTRING (file)->size
- && !bcmp (XSTRING (bestmatch)->data, XSTRING (file)->data,
- bestmatchsize))
- return Qt;
- return Fsubstring (bestmatch, make_number (0), make_number (bestmatchsize));
- quit:
- if (d) closedir (d);
- Vquit_flag = Qnil;
- return Fsignal (Qquit, Qnil);
- }
-
- file_name_completion_stat (dirname, dp, st_addr)
- Lisp_Object dirname;
- DIRENTRY *dp;
- struct stat *st_addr;
- {
- int len = NAMLEN (dp);
- int pos = XSTRING (dirname)->size;
- char *fullname = (char *) alloca (len + pos + 2);
-
- bcopy (XSTRING (dirname)->data, fullname, pos);
- #ifndef VMS
- if (fullname[pos - 1] != '/')
- fullname[pos++] = '/';
- #endif
-
- bcopy (dp->d_name, fullname + pos, len);
- fullname[pos + len] = 0;
-
- #ifdef S_IFLNK
- /* Use ordinary stat first, if that succeeds,
- so that a symlink pointing to a directory is considered a directory.
- Afterward, use lstat, so that a link pointing to nowhere
- at least seems to exist. */
- if (stat (fullname, st_addr) >= 0)
- return 0;
- return lstat (fullname, st_addr);
- #else
- return stat (fullname, st_addr);
- #endif
- }
-
- Lisp_Object
- make_time (time)
- int time;
- {
- return Fcons (make_number (time >> 16),
- Fcons (make_number (time & 0177777), Qnil));
- }
-
- DEFUN ("file-attributes", Ffile_attributes, Sfile_attributes, 1, 1, 0,
- "Return a list of attributes of file FILENAME.\n\
- Value is nil if specified file cannot be opened.\n\
- Otherwise, list elements are:\n\
- 0. t for directory, string (name linked to) for symbolic link, or nil.\n\
- 1. Number of links to file.\n\
- 2. File uid.\n\
- 3. File gid.\n\
- 4. Last access time, as a list of two integers.\n\
- First integer has high-order 16 bits of time, second has low 16 bits.\n\
- 5. Last modification time, likewise.\n\
- 6. Last status change time, likewise.\n\
- 7. Size in bytes.\n\
- 8. File modes, as a string of ten letters or dashes as in ls -l.\n\
- 9. t iff file's gid would change if file were deleted and recreated.\n\
- 10. inode number.\n\
- \n\
- If file does not exists, returns nil.")
- (filename)
- Lisp_Object filename;
- {
- Lisp_Object values[11];
- Lisp_Object dirname;
- struct stat s;
- struct stat sdir;
- char modes[10];
-
- filename = Fexpand_file_name (filename, Qnil);
- if (lstat (XSTRING (filename)->data, &s) < 0)
- return Qnil;
-
- 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_number (s.st_nlink);
- values[2] = make_number (s.st_uid);
- values[3] = make_number (s.st_gid);
- values[4] = make_time (s.st_atime);
- values[5] = make_time (s.st_mtime);
- values[6] = make_time (s.st_ctime);
- /* perhaps we should set this to most-positive-fixnum if it is too large? */
- values[7] = make_number (s.st_size);
- filemodestring (&s, modes);
- values[8] = make_string (modes, 10);
- #ifdef BSD4_3 /* Gross kludge to avoid lack of "#if defined(...)" in VMS */
- #define BSD4_2 /* A new meaning to the term `backwards compatability' */
- #endif
- #ifdef BSD4_2 /* file gid will be dir gid */
- dirname = Ffile_name_directory (filename);
- if (dirname != Qnil && stat (XSTRING (dirname)->data, &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) */
- #ifdef BSD4_3
- #undef BSD4_2 /* ok, you can look again without throwing up */
- #endif
- values[10] = make_number (s.st_ino);
- return Flist (11, values);
- }
-
- syms_of_dired ()
- {
- defsubr (&Sdirectory_files);
- defsubr (&Sfile_name_completion);
- #ifdef VMS
- defsubr (&Sfile_name_all_versions);
- #endif /* VMS */
- defsubr (&Sfile_name_all_completions);
- defsubr (&Sfile_attributes);
-
- #ifdef VMS
- Qcompletion_ignore_case = intern ("completion-ignore-case");
- staticpro (&Qcompletion_ignore_case);
- #endif /* VMS */
-
- DEFVAR_LISP ("completion-ignored-extensions", &Vcompletion_ignored_extensions,
- "*Completion ignores filenames ending in any string in this list.");
- Vcompletion_ignored_extensions = Qnil;
- }
-