1 ;;; tar-mode.el --- simple editing of tar files from GNU emacs
3 ;; Copyright (C) 1990-1991, 1993-2011 Free Software Foundation, Inc.
5 ;; Author: Jamie Zawinski <jwz@lucid.com>
7 ;; Created: 04 Apr 1990
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 ;; This package attempts to make dealing with Unix 'tar' archives easier.
28 ;; When this code is loaded, visiting a file whose name ends in '.tar' will
29 ;; cause the contents of that archive file to be displayed in a Dired-like
30 ;; listing. It is then possible to use the customary Dired keybindings to
31 ;; extract sub-files from that archive, either by reading them into their own
32 ;; editor buffers, or by copying them directly to arbitrary files on disk.
33 ;; It is also possible to delete sub-files from within the tar file and write
34 ;; the modified archive back to disk, or to edit sub-files within the archive
35 ;; and re-insert the modified files into the archive. See the documentation
36 ;; string of tar-mode for more info.
38 ;; This code now understands the extra fields that GNU tar adds to tar files.
40 ;; This interacts correctly with "uncompress.el" in the Emacs library,
43 ;; (autoload 'uncompress-while-visiting "uncompress")
44 ;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting)
47 ;; Do not attempt to use tar-mode.el with crypt.el, you will lose.
49 ;; *************** TO DO ***************
51 ;; o chmod should understand "a+x,og-w".
53 ;; o It's not possible to add a NEW file to a tar archive; not that
54 ;; important, but still...
56 ;; o The code is less efficient that it could be - in a lot of places, I
57 ;; pull a 512-character string out of the buffer and parse it, when I could
58 ;; be parsing it in place, not garbaging a string. Should redo that.
60 ;; o I'd like a command that searches for a string/regexp in every subfile
61 ;; of an archive, where <esc> would leave you in a subfile-edit buffer.
62 ;; (Like the Meta-R command of the Zmacs mail reader.)
64 ;; o Sometimes (but not always) reverting the tar-file buffer does not
65 ;; re-grind the listing, and you are staring at the binary tar data.
66 ;; Typing 'g' again immediately after that will always revert and re-grind
67 ;; it, though. I have no idea why this happens.
69 ;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar
70 ;; write-file-hook actually writes the file. Instead it should remove the
71 ;; header (and conspire to put it back afterwards) so that other write-file
72 ;; hooks which frob the buffer have a chance to do their dirty work. There
73 ;; might be a problem if the tar write-file-hook does not come *first* on
76 ;; o Block files, sparse files, continuation files, and the various header
77 ;; types aren't editable. Actually I don't know that they work at all.
81 ;; Why does tar-mode edit the file itself instead of using tar?
83 ;; That means that you can edit tar files which you don't have room for
84 ;; on your local disk.
86 ;; I don't know about recent features in gnu tar, but old versions of tar
87 ;; can't replace a file in the middle of a tar file with a new version.
88 ;; Tar-mode can. I don't think tar can do things like chmod the subfiles.
89 ;; An implementation which involved unpacking and repacking the file into
90 ;; some scratch directory would be very wasteful, and wouldn't be able to
91 ;; preserve the file owners.
95 ;; - Rename on ././@LongLink files
96 ;; - Revert confirmation displays the raw data temporarily.
100 (eval-when-compile (require 'cl
))
103 "Simple editing of tar files."
107 (defcustom tar-anal-blocksize
20
108 "The blocksize of tar files written by Emacs, or nil, meaning don't care.
109 The blocksize of a tar file is not really the size of the blocks; rather, it is
110 the number of blocks written with one system call. When tarring to a tape,
111 this is the size of the *tape* blocks, but when writing to a file, it doesn't
112 matter much. The only noticeable difference is that if a tar file does not
113 have a blocksize of 20, tar will tell you that; all this really controls is
114 how many null padding bytes go on the end of the tar file."
115 :type
'(choice integer
(const nil
))
118 (defcustom tar-update-datestamp nil
119 "Non-nil means Tar mode should play fast and loose with sub-file datestamps.
120 If this is true, then editing and saving a tar file entry back into its
121 tar file will update its datestamp. If false, the datestamp is unchanged.
122 You may or may not want this - it is good in that you can tell when a file
123 in a tar archive has been changed, but it is bad for the same reason that
124 editing a file in the tar archive at all is bad - the changed version of
125 the file never exists on disk."
129 (defcustom tar-mode-show-date nil
130 "Non-nil means Tar mode should show the date/time of each subfile.
131 This information is useful, but it takes screen space away from file names."
135 (defvar tar-parse-info nil
)
136 (defvar tar-superior-buffer nil
)
137 (defvar tar-superior-descriptor nil
)
138 (defvar tar-file-name-coding-system nil
)
140 (put 'tar-superior-buffer
'permanent-local t
)
141 (put 'tar-superior-descriptor
'permanent-local t
)
143 ;; The Tar data is made up of bytes and better manipulated as bytes
144 ;; and can be very large, so insert/delete can be costly. The summary we
145 ;; want to display may contain non-ascci chars, of course, so we'd like it
146 ;; to be multibyte. We used to keep both in the same buffer and switch
147 ;; from/to uni/multibyte. But this had several downsides:
148 ;; - set-buffer-multibyte has an O(N^2) worst case that tends to be triggered
149 ;; here, so it gets atrociously slow on large Tar files.
150 ;; - need to widen/narrow the buffer to show/hide the raw data, and need to
151 ;; maintain a tar-header-offset that keeps track of the boundary between
153 ;; - can't use markers because they're not preserved by set-buffer-multibyte.
154 ;; So instead, we now keep the two pieces of data in separate buffers, and
155 ;; use the new buffer-swap-text primitive when we need to change which data
156 ;; is associated with "the" buffer.
157 (defvar tar-data-buffer nil
"Buffer that holds the actual raw tar bytes.")
158 (make-variable-buffer-local 'tar-data-buffer
)
160 (defvar tar-data-swapped nil
161 "If non-nil, `tar-data-buffer' indeed holds raw tar bytes.")
162 (make-variable-buffer-local 'tar-data-swapped
)
164 (defun tar-data-swapped-p ()
165 "Return non-nil if the tar-data is in `tar-data-buffer'."
166 (and (buffer-live-p tar-data-buffer
)
167 ;; Sanity check to try and make sure tar-data-swapped tracks the swap
168 ;; state correctly: the raw data is expected to be always larger than
171 (assert (or (= (buffer-size tar-data-buffer
) (buffer-size))
173 (> (buffer-size tar-data-buffer
) (buffer-size)))))
176 (defun tar-swap-data ()
177 "Swap buffer contents between current buffer and `tar-data-buffer'.
178 Preserve the modified states of the buffers and set `buffer-swapped-with'."
179 (let ((data-buffer-modified-p (buffer-modified-p tar-data-buffer
))
180 (current-buffer-modified-p (buffer-modified-p)))
181 (buffer-swap-text tar-data-buffer
)
182 (setq tar-data-swapped
(not tar-data-swapped
))
183 (restore-buffer-modified-p data-buffer-modified-p
)
184 (with-current-buffer tar-data-buffer
185 (restore-buffer-modified-p current-buffer-modified-p
))))
187 ;;; down to business.
189 (defstruct (tar-header
194 make-tar-header
(data-start name mode uid gid size date checksum
195 link-type link-name magic uname gname dmaj dmin
)))
196 data-start name mode uid gid size date checksum link-type link-name
197 magic uname gname dmaj dmin
198 ;; Start of the header can be nil (meaning it's 512 bytes before data-start)
199 ;; or a marker (in case the header uses LongLink thingies).
202 (defconst tar-name-offset
0)
203 (defconst tar-mode-offset
(+ tar-name-offset
100))
204 (defconst tar-uid-offset
(+ tar-mode-offset
8))
205 (defconst tar-gid-offset
(+ tar-uid-offset
8))
206 (defconst tar-size-offset
(+ tar-gid-offset
8))
207 (defconst tar-time-offset
(+ tar-size-offset
12))
208 (defconst tar-chk-offset
(+ tar-time-offset
12))
209 (defconst tar-linkp-offset
(+ tar-chk-offset
8))
210 (defconst tar-link-offset
(+ tar-linkp-offset
1))
211 ;;; GNU-tar specific slots.
212 (defconst tar-magic-offset
(+ tar-link-offset
100))
213 (defconst tar-uname-offset
(+ tar-magic-offset
8))
214 (defconst tar-gname-offset
(+ tar-uname-offset
32))
215 (defconst tar-dmaj-offset
(+ tar-gname-offset
32))
216 (defconst tar-dmin-offset
(+ tar-dmaj-offset
8))
217 (defconst tar-prefix-offset
(+ tar-dmin-offset
8))
218 (defconst tar-end-offset
(+ tar-prefix-offset
155))
220 (defun tar-roundup-512 (s)
221 "Round S up to the next multiple of 512."
222 (ash (ash (+ s
511) -
9) 9))
224 (defun tar-header-block-tokenize (pos coding
)
225 "Return a `tar-header' structure.
226 This is a list of name, mode, uid, gid, size,
227 write-date, checksum, link-type, and link-name."
228 (if (> (+ pos
512) (point-max)) (error "Malformed Tar header"))
229 (assert (zerop (mod (- pos
(point-min)) 512)))
230 (assert (not enable-multibyte-characters
))
231 (let ((string (buffer-substring pos
(setq pos
(+ pos
512)))))
232 (when ;(some 'plusp string) ; <-- oops, massive cycle hog!
233 (or (not (= 0 (aref string
0))) ; This will do.
234 (not (= 0 (aref string
101))))
235 (let* ((name-end tar-mode-offset
)
236 (link-end (1- tar-magic-offset
))
237 (uname-end (1- tar-gname-offset
))
238 (gname-end (1- tar-dmaj-offset
))
239 (link-p (aref string tar-linkp-offset
))
240 (magic-str (substring string tar-magic-offset
241 ;; The magic string is actually 6bytes
242 ;; of magic string plus 2bytes of version
243 ;; which we here ignore.
244 (- tar-uname-offset
2)))
245 ;; The magic string is "ustar\0" for POSIX format, and
246 ;; "ustar " for GNU Tar's format.
247 (uname-valid-p (car (member magic-str
'("ustar " "ustar\0"))))
249 (nulsexp "[^\000]*\000"))
250 (when (string-match nulsexp string tar-name-offset
)
251 (setq name-end
(min name-end
(1- (match-end 0)))))
252 (when (string-match nulsexp string tar-link-offset
)
253 (setq link-end
(min link-end
(1- (match-end 0)))))
254 (when (string-match nulsexp string tar-uname-offset
)
255 (setq uname-end
(min uname-end
(1- (match-end 0)))))
256 (when (string-match nulsexp string tar-gname-offset
)
257 (setq gname-end
(min gname-end
(1- (match-end 0)))))
258 (setq name
(substring string tar-name-offset name-end
)
259 link-p
(if (or (= link-p
0) (= link-p ?
0))
262 (setq linkname
(substring string tar-link-offset link-end
))
263 (when (and (equal uname-valid-p
"ustar\0")
264 (string-match nulsexp string tar-prefix-offset
)
265 (> (match-end 0) (1+ tar-prefix-offset
)))
266 (setq name
(concat (substring string tar-prefix-offset
269 (if (default-value 'enable-multibyte-characters
)
271 (decode-coding-string name coding
)
273 (decode-coding-string linkname coding
)))
274 (if (and (null link-p
) (string-match "/\\'" name
))
275 (setq link-p
5)) ; directory
277 (if (and (equal name
"././@LongLink")
278 ;; Supposedly @LongLink is only used for GNUTAR
279 ;; format (i.e. "ustar ") but some POSIX Tar files
280 ;; (with "ustar\0") have been seen using it as well.
281 (member magic-str
'("ustar " "ustar\0")))
282 ;; This is a GNU Tar long-file-name header.
283 (let* ((size (tar-parse-octal-integer
284 string tar-size-offset tar-time-offset
))
285 ;; -1 so as to strip the terminating 0 byte.
286 (name (decode-coding-string
287 (buffer-substring pos
(+ pos size -
1)) coding
))
288 (descriptor (tar-header-block-tokenize
289 (+ pos
(tar-roundup-512 size
))
292 ((eq link-p
(- ?L ?
0)) ;GNUTYPE_LONGNAME.
293 (setf (tar-header-name descriptor
) name
))
294 ((eq link-p
(- ?K ?
0)) ;GNUTYPE_LONGLINK.
295 (setf (tar-header-link-name descriptor
) name
))
297 (message "Unrecognized GNU Tar @LongLink format")))
298 (setf (tar-header-header-start descriptor
)
299 (copy-marker (- pos
512) t
))
303 (copy-marker pos nil
)
305 (tar-parse-octal-integer string tar-mode-offset tar-uid-offset
)
306 (tar-parse-octal-integer string tar-uid-offset tar-gid-offset
)
307 (tar-parse-octal-integer string tar-gid-offset tar-size-offset
)
308 (tar-parse-octal-integer string tar-size-offset tar-time-offset
)
309 (tar-parse-octal-long-integer string tar-time-offset tar-chk-offset
)
310 (tar-parse-octal-integer string tar-chk-offset tar-linkp-offset
)
315 (decode-coding-string
316 (substring string tar-uname-offset uname-end
) coding
))
318 (decode-coding-string
319 (substring string tar-gname-offset gname-end
) coding
))
320 (tar-parse-octal-integer string tar-dmaj-offset tar-dmin-offset
)
321 (tar-parse-octal-integer string tar-dmin-offset tar-prefix-offset
)
325 (defun tar-header-data-end (descriptor)
326 (let* ((data-start (tar-header-data-start descriptor
))
327 (link-type (tar-header-link-type descriptor
))
328 (size (tar-header-size descriptor
))
330 ;; Foo. There's an extra empty block after these.
331 ((memq link-type
'(20 55)) 512)
334 (if (and (null link-type
) (> size
0))
335 (tar-roundup-512 size
)
338 (defun tar-parse-octal-integer (string &optional start end
)
339 (if (null start
) (setq start
0))
340 (if (null end
) (setq end
(length string
)))
341 (if (= (aref string start
) 0)
345 (setq n
(if (< (aref string start
) ?
0) n
346 (+ (* n
8) (- (aref string start
) ?
0)))
350 (defun tar-parse-octal-long-integer (string &optional start end
)
351 (if (null start
) (setq start
0))
352 (if (null end
) (setq end
(length string
)))
353 (if (= (aref string start
) 0)
358 (if (>= (aref string start
) ?
0)
359 (setq lo
(+ (* lo
8) (- (aref string start
) ?
0))
360 hi
(+ (* hi
8) (ash lo -
16))
361 lo
(logand lo
65535)))
362 (setq start
(1+ start
)))
365 (defun tar-parse-octal-integer-safe (string)
366 (if (zerop (length string
)) (error "empty string"))
368 (if (or (< c ?
0) (> c ?
7))
369 (error "`%c' is not an octal digit" c
)))
371 (tar-parse-octal-integer string
))
374 (defun tar-header-block-checksum (string)
375 "Compute and return a tar-acceptable checksum for this block."
376 (assert (not (multibyte-string-p string
)))
377 (let* ((chk-field-start tar-chk-offset
)
378 (chk-field-end (+ chk-field-start
8))
381 ;; Add up all of the characters except the ones in the checksum field.
382 ;; Add that field as if it were filled with spaces.
383 (while (< i chk-field-start
)
384 (setq sum
(+ sum
(aref string i
))
386 (setq i chk-field-end
)
388 (setq sum
(+ sum
(aref string i
))
392 (defun tar-header-block-check-checksum (hblock desired-checksum file-name
)
393 "Beep and print a warning if the checksum doesn't match."
394 (if (not (= desired-checksum
(tar-header-block-checksum hblock
)))
395 (progn (beep) (message "Invalid checksum for file %s!" file-name
))))
397 (defun tar-clip-time-string (time)
398 (let ((str (current-time-string time
)))
399 (concat " " (substring str
4 16) (substring str
19 24))))
401 (defun tar-grind-file-mode (mode)
402 "Construct a `-rw--r--r--' string indicating MODE.
403 MODE should be an integer which is a file mode value."
405 (if (zerop (logand 256 mode
)) ?- ?r
)
406 (if (zerop (logand 128 mode
)) ?- ?w
)
407 (if (zerop (logand 1024 mode
)) (if (zerop (logand 64 mode
)) ?- ?x
) ?s
)
408 (if (zerop (logand 32 mode
)) ?- ?r
)
409 (if (zerop (logand 16 mode
)) ?- ?w
)
410 (if (zerop (logand 2048 mode
)) (if (zerop (logand 8 mode
)) ?- ?x
) ?s
)
411 (if (zerop (logand 4 mode
)) ?- ?r
)
412 (if (zerop (logand 2 mode
)) ?- ?w
)
413 (if (zerop (logand 1 mode
)) ?- ?x
)))
415 (defun tar-header-block-summarize (tar-hblock &optional mod-p
)
416 "Return a line similar to the output of `tar -vtf'."
417 (let ((name (tar-header-name tar-hblock
))
418 (mode (tar-header-mode tar-hblock
))
419 (uid (tar-header-uid tar-hblock
))
420 (gid (tar-header-gid tar-hblock
))
421 (uname (tar-header-uname tar-hblock
))
422 (gname (tar-header-gname tar-hblock
))
423 (size (tar-header-size tar-hblock
))
424 (time (tar-header-date tar-hblock
))
425 ;; (ck (tar-header-checksum tar-hblock))
426 (type (tar-header-link-type tar-hblock
))
427 (link-name (tar-header-link-name tar-hblock
)))
428 (format "%c%c%s %7s/%-7s %7s%s %s%s"
430 (cond ((or (eq type nil
) (eq type
0)) ?-
)
431 ((eq type
1) ?h
) ; link
432 ((eq type
2) ?l
) ; symlink
433 ((eq type
3) ?c
) ; char special
434 ((eq type
4) ?b
) ; block special
435 ((eq type
5) ?d
) ; directory
436 ((eq type
6) ?p
) ; FIFO/pipe
437 ((eq type
20) ?
*) ; directory listing
438 ((eq type
28) ?L
) ; next has longname
439 ((eq type
29) ?M
) ; multivolume continuation
440 ((eq type
35) ?S
) ; sparse
441 ((eq type
38) ?V
) ; volume header
442 ((eq type
55) ?H
) ; extended pax header
445 (tar-grind-file-mode mode
)
446 (if (= 0 (length uname
)) uid uname
)
447 (if (= 0 (length gname
)) gid gname
)
449 (if tar-mode-show-date
(tar-clip-time-string time
) "")
451 'mouse-face
'highlight
452 'help-echo
"mouse-2: extract this file into a buffer")
453 (if (or (eq type
1) (eq type
2))
454 (concat (if (= type
1) " ==> " " --> ") link-name
)
457 (defun tar-untar-buffer ()
458 "Extract all archive members in the tar-file into the current directory."
460 ;; FIXME: make it work even if we're not in tar-mode.
461 (let ((descriptors tar-parse-info
)) ;Read the var in its buffer.
463 (if (tar-data-swapped-p) tar-data-buffer
(current-buffer))
464 (set-buffer-multibyte nil
) ;Hopefully, a no-op.
465 (dolist (descriptor descriptors
)
466 (let* ((name (tar-header-name descriptor
))
467 (dir (if (eq (tar-header-link-type descriptor
) 5)
469 (file-name-directory name
)))
470 (start (tar-header-data-start descriptor
))
471 (end (+ start
(tar-header-size descriptor
))))
472 (unless (file-directory-p name
)
473 (message "Extracting %s" name
)
474 (if (and dir
(not (file-exists-p dir
)))
475 (make-directory dir t
))
476 (unless (file-directory-p name
)
477 (write-region start end name
))
478 (set-file-modes name
(tar-header-mode descriptor
))))))))
480 (defun tar-summarize-buffer ()
481 "Parse the contents of the tar file in the current buffer."
482 (assert (tar-data-swapped-p))
483 (let* ((modified (buffer-modified-p))
486 (coding tar-file-name-coding-system
)
488 (with-current-buffer tar-data-buffer
489 (make-progress-reporter "Parsing tar file..."
490 (point-min) (point-max))))
492 (with-current-buffer tar-data-buffer
493 (while (and (< pos
(point-max))
494 (setq descriptor
(tar-header-block-tokenize pos coding
)))
495 (let ((size (tar-header-size descriptor
)))
497 (error "%s has size %s - corrupted"
498 (tar-header-name descriptor
) size
)))
500 ;; This is just too slow. Don't really need it anyway....
501 ;;(tar-header-block-check-checksum
502 ;; hblock (tar-header-block-checksum hblock)
503 ;; (tar-header-name descriptor))
505 (push descriptor result
)
506 (setq pos
(tar-header-data-end descriptor
))
507 (progress-reporter-update progress-reporter pos
)))
509 (set (make-local-variable 'tar-parse-info
) (nreverse result
))
510 ;; A tar file should end with a block or two of nulls,
511 ;; but let's not get a fatal error if it doesn't.
512 (if (null descriptor
)
513 (progress-reporter-done progress-reporter
)
514 (message "Warning: premature EOF parsing tar file"))
515 (goto-char (point-min))
516 (let ((inhibit-read-only t
)
518 (mapconcat 'tar-header-block-summarize tar-parse-info
"\n")))
519 (insert total-summaries
"\n"))
520 (goto-char (point-min))
521 (restore-buffer-modified-p modified
)))
524 (let ((map (make-keymap)))
525 (suppress-keymap map
)
526 (define-key map
" " 'tar-next-line
)
527 (define-key map
"C" 'tar-copy
)
528 (define-key map
"d" 'tar-flag-deleted
)
529 (define-key map
"\^D" 'tar-flag-deleted
)
530 (define-key map
"e" 'tar-extract
)
531 (define-key map
"f" 'tar-extract
)
532 (define-key map
"\C-m" 'tar-extract
)
533 (define-key map
[mouse-2
] 'tar-mouse-extract
)
534 (define-key map
"g" 'revert-buffer
)
535 (define-key map
"h" 'describe-mode
)
536 (define-key map
"n" 'tar-next-line
)
537 (define-key map
"\^N" 'tar-next-line
)
538 (define-key map
[down] 'tar-next-line)
539 (define-key map "o" 'tar-extract-other-window)
540 (define-key map "p" 'tar-previous-line)
541 (define-key map "q" 'quit-window)
542 (define-key map "\^P" 'tar-previous-line)
543 (define-key map [up] 'tar-previous-line)
544 (define-key map "R" 'tar-rename-entry)
545 (define-key map "u" 'tar-unflag)
546 (define-key map "v" 'tar-view)
547 (define-key map "x" 'tar-expunge)
548 (define-key map "\177" 'tar-unflag-backwards)
549 (define-key map "E" 'tar-extract-other-window)
550 (define-key map "M" 'tar-chmod-entry)
551 (define-key map "G" 'tar-chgrp-entry)
552 (define-key map "O" 'tar-chown-entry)
553 ;; Let mouse-1 follow the link.
554 (define-key map [follow-link] 'mouse-face)
556 ;; Make menu bar items.
558 ;; Get rid of the Edit menu bar item to save space.
559 (define-key map [menu-bar edit] 'undefined)
561 (define-key map [menu-bar immediate]
562 (cons "Immediate" (make-sparse-keymap "Immediate")))
564 (define-key map [menu-bar immediate view]
565 '("View This File" . tar-view))
566 (define-key map [menu-bar immediate display]
567 '("Display in Other Window" . tar-display-other-window))
568 (define-key map [menu-bar immediate find-file-other-window]
569 '("Find in Other Window" . tar-extract-other-window))
570 (define-key map [menu-bar immediate find-file]
571 '("Find This File" . tar-extract))
573 (define-key map [menu-bar mark]
574 (cons "Mark" (make-sparse-keymap "Mark")))
576 (define-key map [menu-bar mark unmark-all]
577 '("Unmark All" . tar-clear-modification-flags))
578 (define-key map [menu-bar mark deletion]
579 '("Flag" . tar-flag-deleted))
580 (define-key map [menu-bar mark unmark]
581 '("Unflag" . tar-unflag))
583 (define-key map [menu-bar operate]
584 (cons "Operate" (make-sparse-keymap "Operate")))
586 (define-key map [menu-bar operate chown]
587 '("Change Owner..." . tar-chown-entry))
588 (define-key map [menu-bar operate chgrp]
589 '("Change Group..." . tar-chgrp-entry))
590 (define-key map [menu-bar operate chmod]
591 '("Change Mode..." . tar-chmod-entry))
592 (define-key map [menu-bar operate rename]
593 '("Rename to..." . tar-rename-entry))
594 (define-key map [menu-bar operate copy]
595 '("Copy to..." . tar-copy))
596 (define-key map [menu-bar operate expunge]
597 '("Expunge Marked Files" . tar-expunge))
600 "Local keymap for Tar mode listings.")
603 ;; tar mode is suitable only for specially formatted data.
604 (put 'tar-mode 'mode-class 'special)
605 (put 'tar-subfile-mode 'mode-class 'special)
607 (defun tar-change-major-mode-hook ()
608 ;; Bring the actual Tar data back into the main buffer.
609 (when (tar-data-swapped-p) (tar-swap-data))
610 ;; Throw away the summary.
611 (when (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer)))
613 (defun tar-mode-kill-buffer-hook ()
614 (if (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer)))
617 (define-derived-mode tar-mode nil "Tar"
618 "Major mode for viewing a tar file as a dired-like listing of its contents.
619 You can move around using the usual cursor motion commands.
620 Letters no longer insert themselves.
621 Type `e' to pull a file out of the tar file and into its own buffer;
622 or click mouse-2 on the file's line in the Tar mode buffer.
623 Type `c' to copy an entry from the tar file into another file on disk.
625 If you edit a sub-file of this archive (as with the `e' command) and
626 save it with \\[save-buffer], the contents of that buffer will be
627 saved back into the tar-file buffer; in this way you can edit a file
628 inside of a tar archive without extracting it and re-archiving it.
630 See also: variables `tar-update-datestamp' and `tar-anal-blocksize'.
632 (make-local-variable 'tar-parse-info)
633 (set (make-local-variable 'require-final-newline) nil) ; binary data, dude...
634 (set (make-local-variable 'local-enable-local-variables) nil)
635 (set (make-local-variable 'next-line-add-newlines) nil)
636 (set (make-local-variable 'tar-file-name-coding-system)
637 (or file-name-coding-system
638 default-file-name-coding-system
639 locale-coding-system))
640 ;; Prevent loss of data when saving the file.
641 (set (make-local-variable 'file-precious-flag) t)
642 (buffer-disable-undo)
644 ;; Now move the Tar data into an auxiliary buffer, so we can use the main
645 ;; buffer for the summary.
646 (assert (not (tar-data-swapped-p)))
647 (set (make-local-variable 'revert-buffer-function) 'tar-mode-revert)
648 ;; We started using write-contents-functions, but this hook is not
649 ;; used during auto-save, so we now use
650 ;; write-region-annotate-functions which hooks at a lower-level.
651 (add-hook 'write-region-annotate-functions 'tar-write-region-annotate nil t)
652 (add-hook 'kill-buffer-hook 'tar-mode-kill-buffer-hook nil t)
653 (add-hook 'change-major-mode-hook 'tar-change-major-mode-hook nil t)
654 ;; Tar data is made of bytes, not chars.
655 (set-buffer-multibyte nil) ;Hopefully a no-op.
656 (set (make-local-variable 'tar-data-buffer)
657 (generate-new-buffer (format " *tar-data %s*"
658 (file-name-nondirectory
659 (or buffer-file-name (buffer-name))))))
663 (tar-summarize-buffer)
666 ;; If summarizing caused an error, then maybe the buffer doesn't contain
667 ;; tar data. Rather than show a mysterious empty buffer, let's
668 ;; revert to fundamental-mode.
670 (signal (car err) (cdr err)))))
673 (define-minor-mode tar-subfile-mode
674 "Minor mode for editing an element of a tar-file.
675 This mode arranges for \"saving\" this buffer to write the data
676 into the tar-file buffer that it came from. The changes will actually
677 appear on disk when you save the tar-file's buffer."
678 ;; Don't do this, because it is redundant and wastes mode line space.
679 ;; :lighter " TarFile"
681 (or (and (boundp 'tar-superior-buffer) tar-superior-buffer)
682 (error "This buffer is not an element of a tar file"))
683 (cond (tar-subfile-mode
684 (add-hook 'write-file-functions 'tar-subfile-save-buffer nil t)
685 ;; turn off auto-save.
687 (setq buffer-auto-save-file-name nil))
689 (remove-hook 'write-file-functions 'tar-subfile-save-buffer t))))
692 ;; Revert the buffer and recompute the dired-like listing.
693 (defun tar-mode-revert (&optional no-auto-save no-confirm)
695 (let ((revert-buffer-function nil))
696 (if (tar-data-swapped-p) (tar-swap-data))
697 ;; FIXME: If we ask for confirmation, the user will be temporarily
698 ;; looking at the raw data.
699 (revert-buffer no-auto-save no-confirm 'preserve-modes)
700 ;; Recompute the summary.
701 (if (buffer-live-p tar-data-buffer) (kill-buffer tar-data-buffer))
703 (unless (tar-data-swapped-p) (tar-swap-data))))
706 (defun tar-next-line (arg)
707 "Move cursor vertically down ARG lines and to the start of the filename."
710 (goto-char (or (next-single-property-change (point) 'mouse-face) (point))))
712 (defun tar-previous-line (arg)
713 "Move cursor vertically up ARG lines and to the start of the filename."
715 (tar-next-line (- arg)))
717 (defun tar-current-descriptor (&optional noerror)
718 "Return the tar-descriptor of the current line, or signals an error."
719 ;; I wish lines had plists, like in ZMACS...
720 (or (nth (count-lines (point-min) (line-beginning-position))
724 (error "This line does not describe a tar-file entry"))))
726 (defun tar-get-descriptor ()
727 (let* ((descriptor (tar-current-descriptor))
728 (size (tar-header-size descriptor))
729 (link-p (tar-header-link-type descriptor)))
731 (error "This is %s, not a real file"
732 (cond ((eq link-p 5) "a directory")
733 ((eq link-p 20) "a tar directory header")
734 ((eq link-p 28) "a next has longname")
735 ((eq link-p 29) "a multivolume-continuation")
736 ((eq link-p 35) "a sparse entry")
737 ((eq link-p 38) "a volume header")
738 ((eq link-p 55) "an extended pax header")
740 (if (zerop size) (message "This is a zero-length file"))
743 (defun tar-mouse-extract (event)
744 "Extract a file whose tar directory line you click on."
746 (with-current-buffer (window-buffer (posn-window (event-end event)))
748 (goto-char (posn-point (event-end event)))
749 ;; Just make sure this doesn't get an error.
750 (tar-get-descriptor)))
751 (select-window (posn-window (event-end event)))
752 (goto-char (posn-point (event-end event)))
755 (defun tar-file-name-handler (op &rest args)
756 "Helper function for `tar-extract'."
757 (or (eq op 'file-exists-p)
758 (let ((file-name-handler-alist nil))
761 (defun tar-extract (&optional other-window-p)
762 "In Tar mode, extract this entry of the tar file into its own buffer."
764 (let* ((view-p (eq other-window-p 'view))
765 (descriptor (tar-get-descriptor))
766 (name (tar-header-name descriptor))
767 (size (tar-header-size descriptor))
768 (start (tar-header-data-start descriptor))
769 (end (+ start size)))
770 (let* ((tar-buffer (current-buffer))
771 (tarname (buffer-name))
772 (bufname (concat (file-name-nondirectory name)
776 (read-only-p (or buffer-read-only view-p))
777 (new-buffer-file-name (expand-file-name
778 ;; `:' is not allowed on Windows
780 (if (string-match "/" name)
782 ;; Make sure `name' contains a /
783 ;; so set-auto-mode doesn't try
784 ;; to look at `tarname' for hints.
785 (concat "./" name)))))
786 (buffer (get-file-buffer new-buffer-file-name))
790 (setq buffer (generate-new-buffer bufname))
791 (with-current-buffer buffer
792 (setq undo-list buffer-undo-list
794 (setq bufname (buffer-name buffer))
795 (setq just-created t)
796 (with-current-buffer tar-data-buffer
798 (narrow-to-region start end)
800 (setq coding (or coding-system-for-read
801 (and set-auto-coding-function
802 (funcall set-auto-coding-function
804 ;; The following binding causes
805 ;; find-buffer-file-type-coding-system
806 ;; (defined on dos-w32.el) to act as if
807 ;; the file being extracted existed, so
808 ;; that the file's contents' encoding and
809 ;; EOL format are auto-detected.
810 (let ((file-name-handler-alist
811 '(("" . tar-file-name-handler))))
812 (car (find-operation-coding-system
813 'insert-file-contents
814 (cons name (current-buffer)) t)))))
816 (eq (coding-system-type coding) 'undecided))
817 (setq coding (detect-coding-region start end t)))
818 (if (and (default-value 'enable-multibyte-characters)
819 (coding-system-get coding :for-unibyte))
820 (with-current-buffer buffer
821 (set-buffer-multibyte nil)))
823 (decode-coding-region start end coding buffer)))
824 (with-current-buffer buffer
825 (goto-char (point-min))
826 (setq buffer-file-name new-buffer-file-name)
827 (setq buffer-file-truename
828 (abbreviate-file-name buffer-file-name))
829 ;; Force buffer-file-coding-system to what
830 ;; decode-coding-region actually used.
831 (set-buffer-file-coding-system last-coding-system-used t)
832 ;; Set the default-directory to the dir of the
834 (setq default-directory
835 (with-current-buffer tar-buffer
837 (rename-buffer bufname)
838 (set-buffer-modified-p nil)
839 (setq buffer-undo-list undo-list)
840 (normal-mode) ; pick a mode.
841 (set (make-local-variable 'tar-superior-buffer) tar-buffer)
842 (set (make-local-variable 'tar-superior-descriptor) descriptor)
843 (setq buffer-read-only read-only-p)
844 (tar-subfile-mode 1)))
847 (view-buffer buffer (and just-created 'kill-buffer-if-not-modified)))
848 ((eq other-window-p 'display) (display-buffer buffer))
849 (other-window-p (switch-to-buffer-other-window buffer))
850 (t (switch-to-buffer buffer))))))
853 (defun tar-extract-other-window ()
854 "In Tar mode, find this entry of the tar file in another window."
858 (defun tar-display-other-window ()
859 "In Tar mode, display this entry of the tar file in another window."
861 (tar-extract 'display))
864 "In Tar mode, view the tar file entry on this line."
869 (defun tar-read-file-name (&optional prompt)
870 "Read a file name with this line's entry as the default."
871 (or prompt (setq prompt "Copy to: "))
872 (let* ((default-file (expand-file-name
873 (tar-header-name (tar-current-descriptor))))
874 (target (expand-file-name
875 (read-file-name prompt
876 (file-name-directory default-file)
878 (if (or (string= "" (file-name-nondirectory target))
879 (file-directory-p target))
880 (setq target (concat (if (string-match "/$" target)
881 (substring target 0 (1- (match-end 0)))
884 (file-name-nondirectory default-file))))
888 (defun tar-copy (&optional to-file)
889 "In Tar mode, extract this entry of the tar file into a file on disk.
890 If TO-FILE is not supplied, it is prompted for, defaulting to the name of
891 the current tar-entry."
892 (interactive (list (tar-read-file-name)))
893 (let* ((descriptor (tar-get-descriptor))
894 (name (tar-header-name descriptor))
895 (size (tar-header-size descriptor))
896 (start (tar-header-data-start descriptor))
898 (inhibit-file-name-handlers inhibit-file-name-handlers)
899 (inhibit-file-name-operation inhibit-file-name-operation))
901 (if (tar-data-swapped-p) tar-data-buffer (current-buffer))
902 ;; Inhibit compressing a subfile again if *both* name and
903 ;; to-file are handled by jka-compr
904 (if (and (eq (find-file-name-handler name 'write-region)
906 (eq (find-file-name-handler to-file 'write-region)
908 (setq inhibit-file-name-handlers
909 (cons 'jka-compr-handler
910 (and (eq inhibit-file-name-operation 'write-region)
911 inhibit-file-name-handlers))
912 inhibit-file-name-operation 'write-region))
913 (let ((coding-system-for-write 'no-conversion))
914 (write-region start end to-file nil nil nil t)))
915 (message "Copied tar entry %s to %s" name to-file)))
917 (defun tar-flag-deleted (p &optional unflag)
918 "In Tar mode, mark this sub-file to be deleted from the tar file.
919 With a prefix argument, mark that many files."
923 (if (tar-current-descriptor unflag) ; barf if we're not on an entry-line.
926 (insert (if unflag " " "D"))))
927 (forward-line (if (< p 0) -1 1)))
928 (if (eobp) nil (forward-char 36)))
930 (defun tar-unflag (p)
931 "In Tar mode, un-mark this sub-file if it is marked to be deleted.
932 With a prefix argument, un-mark that many files forward."
934 (tar-flag-deleted p t))
936 (defun tar-unflag-backwards (p)
937 "In Tar mode, un-mark this sub-file if it is marked to be deleted.
938 With a prefix argument, un-mark that many files backward."
940 (tar-flag-deleted (- p) t))
943 (defun tar-expunge-internal ()
944 "Expunge the tar-entry specified by the current line."
945 (let ((descriptor (tar-current-descriptor)))
947 ;; delete the current line...
948 (delete-region (line-beginning-position) (line-beginning-position 2))
950 ;; delete the data pointer...
951 (setq tar-parse-info (delq descriptor tar-parse-info))
953 ;; delete the data from inside the file...
954 (with-current-buffer tar-data-buffer
955 (delete-region (or (tar-header-header-start descriptor)
956 (- (tar-header-data-start descriptor) 512))
957 (tar-header-data-end descriptor)))))
960 (defun tar-expunge (&optional noconfirm)
961 "In Tar mode, delete all the archived files flagged for deletion.
962 This does not modify the disk image; you must save the tar file itself
963 for this to be permanent."
966 (y-or-n-p "Expunge files marked for deletion? "))
969 (goto-char (point-min))
972 (progn (tar-expunge-internal)
975 ;; after doing the deletions, add any padding that may be necessary.
976 (tar-pad-to-blocksize))
978 (message "Nothing to expunge.")
979 (message "%s files expunged. Be sure to save this buffer." n)))))
982 (defun tar-clear-modification-flags ()
983 "Remove the stars at the beginning of each line."
986 (goto-char (point-min))
988 (if (not (eq (following-char) ?\s))
989 (progn (delete-char 1) (insert " ")))
993 (defun tar-chown-entry (new-uid)
994 "Change the user-id associated with this entry in the tar file.
995 If this tar file was written by GNU tar, then you will be able to edit
996 the user id as a string; otherwise, you must edit it as a number.
997 You can force editing as a number by calling this with a prefix arg.
998 This does not modify the disk image; you must save the tar file itself
999 for this to be permanent."
1002 (let ((descriptor (tar-current-descriptor)))
1003 (if (or current-prefix-arg
1004 (not (tar-header-magic descriptor)))
1007 (format "%s" (tar-header-uid descriptor)))
1008 (read-string "New UID string: " (tar-header-uname descriptor))))))
1009 (cond ((stringp new-uid)
1010 (setf (tar-header-uname (tar-current-descriptor)) new-uid)
1011 (tar-alter-one-field tar-uname-offset
1012 (concat (encode-coding-string
1013 new-uid tar-file-name-coding-system)
1016 (setf (tar-header-uid (tar-current-descriptor)) new-uid)
1017 (tar-alter-one-field tar-uid-offset
1018 (concat (substring (format "%6o" new-uid) 0 6) "\000 ")))))
1021 (defun tar-chgrp-entry (new-gid)
1022 "Change the group-id associated with this entry in the tar file.
1023 If this tar file was written by GNU tar, then you will be able to edit
1024 the group id as a string; otherwise, you must edit it as a number.
1025 You can force editing as a number by calling this with a prefix arg.
1026 This does not modify the disk image; you must save the tar file itself
1027 for this to be permanent."
1030 (let ((descriptor (tar-current-descriptor)))
1031 (if (or current-prefix-arg
1032 (not (tar-header-magic descriptor)))
1035 (format "%s" (tar-header-gid descriptor)))
1036 (read-string "New GID string: " (tar-header-gname descriptor))))))
1037 (cond ((stringp new-gid)
1038 (setf (tar-header-gname (tar-current-descriptor)) new-gid)
1039 (tar-alter-one-field tar-gname-offset
1040 (concat (encode-coding-string
1041 new-gid tar-file-name-coding-system)
1044 (setf (tar-header-gid (tar-current-descriptor)) new-gid)
1045 (tar-alter-one-field tar-gid-offset
1046 (concat (substring (format "%6o" new-gid) 0 6) "\000 ")))))
1048 (defun tar-rename-entry (new-name)
1049 "Change the name associated with this entry in the tar file.
1050 This does not modify the disk image; you must save the tar file itself
1051 for this to be permanent."
1053 (list (read-string "New name: "
1054 (tar-header-name (tar-current-descriptor)))))
1055 (if (string= "" new-name) (error "zero length name"))
1056 (let ((encoded-new-name (encode-coding-string new-name
1057 tar-file-name-coding-system))
1058 (descriptor (tar-current-descriptor))
1060 (when (tar-header-header-start descriptor)
1061 ;; FIXME: Make it work for ././@LongLink.
1062 (error "Rename with @LongLink format is not implemented"))
1064 (when (and (> (length encoded-new-name) 98)
1065 (string-match "/" encoded-new-name
1066 (- (length encoded-new-name) 99))
1067 (< (match-beginning 0) 155))
1068 (unless (equal (tar-header-magic descriptor) "ustar\0")
1069 (tar-alter-one-field tar-magic-offset (concat "ustar\0" "00")))
1070 (setq prefix (substring encoded-new-name 0 (match-beginning 0)))
1071 (setq encoded-new-name (substring encoded-new-name (match-end 0))))
1073 (if (> (length encoded-new-name) 98) (error "name too long"))
1074 (setf (tar-header-name descriptor) new-name)
1075 (tar-alter-one-field 0
1076 (substring (concat encoded-new-name (make-string 99 0)) 0 99))
1078 (tar-alter-one-field tar-prefix-offset
1079 (substring (concat prefix (make-string 155 0)) 0 155)))))
1082 (defun tar-chmod-entry (new-mode)
1083 "Change the protection bits associated with this entry in the tar file.
1084 This does not modify the disk image; you must save the tar file itself
1085 for this to be permanent."
1086 (interactive (list (tar-parse-octal-integer-safe
1087 (read-string "New protection (octal): "))))
1088 (setf (tar-header-mode (tar-current-descriptor)) new-mode)
1089 (tar-alter-one-field tar-mode-offset
1090 (concat (substring (format "%6o" new-mode) 0 6) "\000 ")))
1093 (defun tar-alter-one-field (data-position new-data-string &optional descriptor)
1094 (unless descriptor (setq descriptor (tar-current-descriptor)))
1096 ;; update the header-line.
1097 (let ((col (current-column)))
1098 (delete-region (line-beginning-position)
1099 (prog2 (forward-line 1)
1101 ;; Insert the new text after the old, before deleting,
1102 ;; to preserve markers such as the window start.
1103 (insert (tar-header-block-summarize descriptor) "\n")))
1104 (forward-line -1) (move-to-column col))
1106 (assert (tar-data-swapped-p))
1107 (with-current-buffer tar-data-buffer
1108 (let* ((start (- (tar-header-data-start descriptor) 512)))
1110 ;; delete the old field and insert a new one.
1111 (goto-char (+ start data-position))
1112 (delete-region (point) (+ (point) (length new-data-string))) ; <--
1113 (assert (not (or enable-multibyte-characters
1114 (multibyte-string-p new-data-string))))
1115 (insert new-data-string)
1117 ;; compute a new checksum and insert it.
1118 (let ((chk (tar-header-block-checksum
1119 (buffer-substring start (+ start 512)))))
1120 (goto-char (+ start tar-chk-offset))
1121 (delete-region (point) (+ (point) 8))
1122 (insert (format "%6o\0 " chk))
1123 (setf (tar-header-checksum descriptor) chk)
1125 ;; ok, make sure we didn't botch it.
1126 (tar-header-block-check-checksum
1127 (buffer-substring start (+ start 512))
1128 chk (tar-header-name descriptor))
1132 (defun tar-octal-time (timeval)
1133 ;; Format a timestamp as 11 octal digits. Ghod, I hope this works...
1134 (let ((hibits (car timeval)) (lobits (car (cdr timeval))))
1135 (format "%05o%01o%05o"
1137 (logior (lsh (logand 3 hibits) 1)
1138 (if (> (logand lobits 32768) 0) 1 0))
1139 (logand 32767 lobits)
1142 (defun tar-subfile-save-buffer ()
1143 "In tar subfile mode, save this buffer into its parent tar-file buffer.
1144 This doesn't write anything to disk; you must save the parent tar-file buffer
1145 to make your changes permanent."
1147 (if (not (and (boundp 'tar-superior-buffer) tar-superior-buffer))
1148 (error "This buffer has no superior tar file buffer"))
1149 (if (not (and (boundp 'tar-superior-descriptor) tar-superior-descriptor))
1150 (error "This buffer doesn't have an index into its superior tar file!"))
1151 (let ((subfile (current-buffer))
1152 (coding buffer-file-coding-system)
1153 (descriptor tar-superior-descriptor)
1155 (with-current-buffer tar-superior-buffer
1156 (let* ((start (tar-header-data-start descriptor))
1157 (name (tar-header-name descriptor))
1158 (size (tar-header-size descriptor))
1159 (head (memq descriptor tar-parse-info)))
1161 (error "Can't find this tar file entry in its parent tar file!"))
1162 (with-current-buffer tar-data-buffer
1163 ;; delete the old data...
1164 (let* ((data-start start)
1165 (data-end (+ data-start (tar-roundup-512 size))))
1166 (narrow-to-region data-start data-end)
1167 (delete-region (point-min) (point-max))
1168 ;; insert the new data...
1169 (goto-char data-start)
1170 (let ((dest (current-buffer)))
1171 (with-current-buffer subfile
1174 (encode-coding-region (point-min) (point-max) coding dest))))
1175 (setq subfile-size (- (point-max) (point-min)))
1177 ;; pad the new data out to a multiple of 512...
1178 (let ((subfile-size-pad (tar-roundup-512 subfile-size)))
1179 (goto-char (point-max))
1180 (insert (make-string (- subfile-size-pad subfile-size) 0))
1182 ;; update the data of this files...
1183 (setf (tar-header-size descriptor) subfile-size)
1185 ;; Update the size field in the header block.
1188 ;; alter the descriptor-line and header
1190 (let ((position (- (length tar-parse-info) (length head))))
1191 (goto-char (point-min))
1192 (forward-line position)
1193 (tar-alter-one-field tar-size-offset (format "%11o " subfile-size))
1195 ;; Maybe update the datestamp.
1196 (when tar-update-datestamp
1197 (tar-alter-one-field tar-time-offset
1198 (concat (tar-octal-time (current-time)) " "))))
1199 ;; After doing the insertion, add any necessary final padding.
1200 (tar-pad-to-blocksize))
1201 (set-buffer-modified-p t) ; mark the tar file as modified
1203 (set-buffer-modified-p nil) ; mark the tar subfile as unmodified
1204 (message "Saved into tar-buffer `%s'. Be sure to save that buffer!"
1205 (buffer-name tar-superior-buffer))
1206 ;; Prevent basic-save-buffer from changing our coding-system.
1207 (setq last-coding-system-used buffer-file-coding-system)
1208 ;; Prevent ordinary saving from happening.
1212 ;; When this function is called, it is sure that the buffer is unibyte.
1213 (defun tar-pad-to-blocksize ()
1214 "If we are being anal about tar file blocksizes, fix up the current buffer.
1215 Leaves the region wide."
1216 (if (null tar-anal-blocksize)
1218 (let* ((last-desc (nth (1- (length tar-parse-info)) tar-parse-info))
1219 (start (tar-header-data-start last-desc))
1220 (link-p (tar-header-link-type last-desc))
1221 (size (if link-p 0 (tar-header-size last-desc)))
1222 (data-end (+ start size))
1223 (bbytes (ash tar-anal-blocksize 9))
1224 (pad-to (+ bbytes (* bbytes (/ (- data-end (point-min)) bbytes)))))
1225 ;; If the padding after the last data is too long, delete some;
1226 ;; else insert some until we are padded out to the right number of blocks.
1228 (with-current-buffer tar-data-buffer
1229 (let ((goal-end (+ (point-min) pad-to)))
1230 (if (> (point-max) goal-end)
1231 (delete-region goal-end (point-max))
1232 (goto-char (point-max))
1233 (insert (make-string (- goal-end (point-max)) ?\0))))))))
1236 ;; Used in write-region-annotate-functions to write tar-files out correctly.
1237 (defun tar-write-region-annotate (start end)
1238 ;; When called from write-file (and auto-save), `start' is nil.
1239 ;; When called from M-x write-region, we assume the user wants to save
1240 ;; (part of) the summary, not the tar data.
1241 (unless (or start (not (tar-data-swapped-p)))
1242 (tar-clear-modification-flags)
1243 (set-buffer tar-data-buffer)
1248 ;;; tar-mode.el ends here
HCoop / bpt / emacs.git / blob