(let ((buffer-name (buffer-name))
(limit 0)
file-name)
- ;; Eliminate all slashes and backslashes by
- ;; replacing them with sequences that start with %.
- ;; Quote % also, to keep distinct names distinct.
- (while (string-match "[/\\%]" buffer-name limit)
+ ;; Restrict the characters used in the file name to those which
+ ;; are known to be safe on all filesystems, url-encoding the
+ ;; rest.
+ ;; We do this on all platforms, because even if we are not
+ ;; running on DOS/Windows, the current directory may be on a
+ ;; mounted VFAT filesystem, such as a USB memory stick.
+ (while (string-match "[^A-Za-z0-9-_.~#+]" buffer-name limit)
(let* ((character (aref buffer-name (match-beginning 0)))
(replacement
- (cond ((eq character ?%) "%%")
- ((eq character ?/) "%+")
- ((eq character ?\\) "%-"))))
+ ;; For multibyte characters, this will produce more than
+ ;; 2 hex digits, so is not true URL encoding.
+ (format "%%%02X" character)))
(setq buffer-name (replace-match replacement t t buffer-name))
(setq limit (1+ (match-end 0)))))
;; Generate the file name.