-;;; dos-fns.el --- MS-Dos specific functions.
+;;; dos-fns.el --- MS-Dos specific functions
;; Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
;; Change a leading period to a leading underscore.
(if (= (aref string 0) ?.)
(aset string 0 ?_))
+ ;; If the name is longer than 8 chars, and doesn't have a
+ ;; period, and we have a dash or underscore that isn't too
+ ;; close to the beginning, change that to a period. This
+ ;; is so we could salvage more characters of the original
+ ;; name by pushing them into the extension.
+ (if (and (not (string-match "\\." string))
+ (> (length string) 8)
+ ;; We don't gain anything if we put the period closer
+ ;; than 5 chars from the beginning (5 + 3 = 8).
+ (setq i (string-match "[-_]" string 5)))
+ (aset string i ?\.))
;; Get rid of invalid characters.
(while (setq i (string-match
"[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
string))
(aset string i ?_))
- ;; If we don't have a period,
- ;; and we have a dash or underscore that isn't the first char,
- ;; change that to a period.
- (if (and (not (string-match "\\." string))
- (setq i (string-match "[-_]" string 1)))
- (aset string i ?\.))
;; If we don't have a period in the first 8 chars, insert one.
+ ;; This enables to have 3 more characters from the original
+ ;; name in the extension.
(if (> (or (string-match "\\." string) (length string))
8)
(setq string
(if (> (length string) (+ firstdot 4))
(setq string (substring string 0 (+ firstdot 4))))
;; Change all periods except the first one into underscores.
+ ;; (DOS doesn't allow more than one period.)
(while (string-match "\\." string (1+ firstdot))
(setq i (string-match "\\." string (1+ firstdot)))
(aset string i ?_))
- ;; If the last character of the original filename was `~',
- ;; make sure the munged name ends with it also. This is so
- ;; a backup file retains its final `~'.
- (if (equal lastchar ?~)
+ ;; If the last character of the original filename was `~' or `#',
+ ;; make sure the munged name ends with it also. This is so that
+ ;; backup and auto-save files retain their telltale form.
+ (if (memq lastchar '(?~ ?#))
(aset string (1- (length string)) lastchar))))
(concat (if (and (stringp dir)
(memq (aref dir dlen-m-1) '(?/ ?\\)))
(convert-standard-filename dir))
string))))))
+(defun dos-8+3-filename (filename)
+ "Truncate FILENAME to DOS 8+3 limits."
+ (if (or (not (stringp filename))
+ (< (length filename) 5)) ; too short to give any trouble
+ filename
+ (let ((flen (length filename)))
+ ;; If FILENAME has a trailing slash, remove it and recurse.
+ (if (memq (aref filename (1- flen)) '(?/ ?\\))
+ (concat (dos-8+3-filename (substring filename 0 (1- flen)))
+ "/")
+ (let* (;; ange-ftp gets in the way for names like "/foo:bar".
+ ;; We need to inhibit all magic file names, because
+ ;; remote file names should never be passed through
+ ;; this function, as they are not meant for the local
+ ;; filesystem!
+ (file-name-handler-alist nil)
+ (dir
+ ;; If FILENAME is "x:foo", file-name-directory returns
+ ;; "x:/bar/baz", substituting the current working
+ ;; directory on drive x:. We want to be left with "x:"
+ ;; instead.
+ (if (and (< 1 flen)
+ (eq (aref filename 1) ?:)
+ (null (string-match "[/\\]" filename)))
+ (substring filename 0 2)
+ (file-name-directory filename)))
+ (dlen-m-1 (1- (length dir)))
+ (string (copy-sequence (file-name-nondirectory filename)))
+ (strlen (length string))
+ (lastchar (aref string (1- strlen)))
+ i firstdot)
+ (setq firstdot (string-match "\\." string))
+ (cond
+ (firstdot
+ ;; Truncate the extension to 3 characters.
+ (if (> strlen (+ firstdot 4))
+ (setq string (substring string 0 (+ firstdot 4))))
+ ;; Truncate the basename to 8 characters.
+ (if (> firstdot 8)
+ (setq string (concat (substring string 0 8)
+ "."
+ (substring string (1+ firstdot))))))
+ ((> strlen 8)
+ ;; No dot; truncate file name to 8 characters.
+ (setq string (substring string 0 8))))
+ ;; If the last character of the original filename was `~',
+ ;; make sure the munged name ends with it also. This is so
+ ;; a backup file retains its final `~'.
+ (if (equal lastchar ?~)
+ (aset string (1- (length string)) lastchar))
+ (concat (if (and (stringp dir)
+ (memq (aref dir dlen-m-1) '(?/ ?\\)))
+ (concat (dos-8+3-filename (substring dir 0 dlen-m-1))
+ "/")
+ ;; Recurse to truncate the leading directories.
+ (dos-8+3-filename dir))
+ string))))))
+
+;; Make sure auto-save file names don't contain characters invalid for
+;; the underlying filesystem. This is particularly annoying with
+;; `compose-mail's *mail* buffers: `*' is not allowed in file names on
+;; DOS/Windows, so Emacs bitches on you each time it tries to autosave
+;; the message being composed.
+(fset 'original-make-auto-save-file-name
+ (symbol-function 'make-auto-save-file-name))
+
+(defun make-auto-save-file-name ()
+ "Return file name to use for auto-saves of current buffer.
+Does not consider `auto-save-visited-file-name' as that variable is checked
+before calling this function. You can redefine this for customization.
+See also `auto-save-file-name-p'."
+ (let ((filename (original-make-auto-save-file-name)))
+ ;; Don't modify remote (ange-ftp) filenames
+ (if (string-match "^/\\w+@[-A-Za-z0-9._]+:" filename)
+ filename
+ (convert-standard-filename filename))))
+
;; See dos-vars.el for defcustom.
(defvar msdos-shells)
(provide 'dos-fns)
-; dos-fns.el ends here
+;;; dos-fns.el ends here