(rfc2047-encode-region): Skip ASCII at beginning and

end of region.

diff --git a/lisp/rfc2047.el b/lisp/rfc2047.el
index c5605a0..7f4eecc 100644 (file)
--- a/lisp/rfc2047.el
+++ b/lisp/rfc2047.el
@@ -290,13 +290,23 @@ Dynamically bind `rfc2047-encoding-type' to change that."
   (save-restriction
     (narrow-to-region b e)
     (if (eq 'mime rfc2047-encoding-type)
-       ;; Simple case -- treat as single word.
+       ;; Simple case.  Treat as single word after any initial ASCII
+       ;; part and before any tailing ASCII part.  The leading ASCII
+       ;; is relevant for instance in Subject headers with `Re:' for
+       ;; interoperability with non-MIME clients, and we might as
+       ;; well avoid the tail too.
        (progn
          (goto-char (point-min))
          ;; Does it need encoding?
-         (skip-chars-forward "\000-\177" e)
+         (skip-chars-forward "\000-\177")
          (unless (eobp)
-           (rfc2047-encode b e)))
+           (skip-chars-backward "^ \n") ; beginning of space-delimited word
+           (rfc2047-encode (point) (progn
+                                     (goto-char e)
+                                     (skip-chars-backward "\000-\177")
+                                     (skip-chars-forward "^ \n")
+                                     ;; end of space-delimited word
+                                     (point)))))
       ;; `address-mime' case -- take care of quoted words, comments.
       (with-syntax-table rfc2047-syntax-table
        (let ((start)                   ; start of current token
@@ -580,6 +590,12 @@ By default, the region is treated as containing addresses (see
 ;; Also check whether it needs to worry about delimiting fields like
 ;; encoding.
 
+;; In fact it's reported that (invalid) encoding of mailboxes in
+;; addr-specs is in use, so delimiting fields might help.  Probably
+;; not decoding a word which isn't properly delimited is good enough
+;; and worthwhile (is it more correct or not?), e.g. something like
+;; `=?iso-8859-1?q?foo?=@'.
+
 (defun rfc2047-decode-region (start end)
   "Decode MIME-encoded words in region between START and END."
   (interactive "r")