Re: ange-ftp-file-size

[Toru TSUNEYOSHI <t_tuneyosi@hotmail.com>]

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Thank you for your checking.

>> BTW, about save-match-data, I used it because of inhibiting changing old
>> match data. Using it is wrong (as the style)?
> 
> save-match-data should only be used where it is really needed, not
> defensively: 99% of the code may destroy the match-date (and could thus
> use save-match-data defensively), whereas less than 1% of the code needs
> the match-data to be saved.
> 

I understand you. I will be carefull about using `save-match-data' from
now on.

>> -          (and (eq cmd0 'quote) (string= cmd1 "mdtm")))
>> +          (and (eq cmd0 'quote) (string-match-p "^\\(mdtm\\|size\\)$" cmd1)))
> 
> I used (member cmd1 '("mdtm" "size")) instead.  The regexp equivalent
> would be "\\`\\(mdtm\\|size\\)\\'".
> 

I also think it is better.

>> +	 (res (prog2
>> +		  (unless ascii-mode
>> +		    (ange-ftp-set-binary-mode host user))
>> +		  (ange-ftp-send-cmd host user (list 'quote "size" name))
>> +		(unless ascii-mode
>> +		  (ange-ftp-set-ascii-mode host user))))
> 
> Now that I look at it: isn't it problematic to set the mode to `ascii'
> here?  If the mode was binary before and we call it with ascii-mode=nil,
> we end up switching to ascii mode unwittingly, don't we?
> 

I read the code of `ange-ftp.el'.
The follows is written...

    In comments:

        By default ange-ftp transfers files in ASCII mode.

    In code:

        (defun ange-ftp-...
            ...
              (unwind-protect
                  (progn
                    ...
                    (if binary
                        (ange-ftp-set-binary-mode host user))
                    ...)
                (if binary
                    (ange-ftp-set-ascii-mode host user)))
            ...)

So, I understood that `ASCII mode' is basic mode.
I wrote after the style.
(In my former patch, I should have used `unwind-protect'.)

But, as you wrote, there is no guarantee that the mode is always ascii.
So, I wrote the mode changing clearly.

> 
>         Stefan
> 

Would you like to check my patch again ?

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--- ange-ftp.el.orig	Sun Jun 21 13:37:58 2009
+++ ange-ftp.el	Sat Oct 17 11:06:58 2009
@@ -2338,7 +2338,7 @@
 
      ;; Second argument is the remote name
      ((or (memq cmd0 '(append put chmod))
-          (and (eq cmd0 'quote) (string= cmd1 "mdtm")))
+          (and (eq cmd0 'quote) (member cmd1 '("mdtm" "size"))))
       (setq cmd2 (funcall fix-name-func cmd2)))
      ;; Both arguments are remote names
      ((eq cmd0 'rename)
@@ -3455,7 +3455,7 @@
 		      '(0 0)		;4 atime
 		      (ange-ftp-file-modtime file) ;5 mtime
 		      '(0 0)		;6 ctime
-		      -1		;7 size
+		      (ange-ftp-file-size file)	;7 size
 		      (concat (if (stringp dirp) "l" (if dirp "d" "-"))
 			      "?????????") ;8 mode
 		      nil		;9 gid weird
@@ -3557,6 +3557,35 @@
           (or (zerop (car file-mdtm))
               (<= (float-time file-mdtm) (float-time buf-mdtm))))
       (ange-ftp-real-verify-visited-file-modtime buf))))
+
+(defun ange-ftp-file-size (file &optional ascii-mode)
+  "Return the size of remote file FILE. Return -1 if can't get it.
+If ascii-mode is non-nil, return the size with the extra octets that
+need to be inserted, one at the end of each line, to provide correct
+end-of-line semantics for a transfer using TYPE=A. The default is nil,
+so return the size on the remote host exactly. See RFC 3659."
+  (let* ((parsed (ange-ftp-ftp-name file))
+	 (host (nth 0 parsed))
+	 (user (nth 1 parsed))
+	 (name (ange-ftp-quote-string (nth 2 parsed)))
+	 ;; At least one FTP server (wu-ftpd) can return a "226
+	 ;; Transfer complete" before the "213 SIZE".  Let's skip
+	 ;; that.
+	 (ange-ftp-skip-msgs (concat ange-ftp-skip-msgs "\\|^226"))
+	 res line)
+    (unwind-protect
+	(progn
+	  (if ascii-mode
+	      (ange-ftp-set-ascii-mode host user)
+	    (ange-ftp-set-binary-mode host user))
+	  (setq res (ange-ftp-send-cmd host user (list 'quote "size" name))
+		line (cdr res))
+	  (if (string-match "^213 \\([0-9]+\\)$" line)
+	      (string-to-number (match-string 1 line))
+	    -1))
+      (unless ascii-mode
+	(ange-ftp-set-ascii-mode host user)))))
+
 \f
 ;;;; ------------------------------------------------------------
 ;;;; File copying support... totally re-written 6/24/92.