Internal coding system - Need advice 22 v. 23

[Sebastian Rose <sebastian_rose@gmx.de>]

Hi emacs experts,


please, could someone help me to understand the internal coding system
of emacs-22? Or simply point me to a function that correctly decodes
multibyte characters in emacs-22?



Here is why:

To send unicode text to emacs via org-protocol, I wrote a function, that
decodes all those hex-encoded characters (e.g. `%C3%B6' is the German
Umlaut `ü'). That function `org-protocol-unhex-string' is defunned in
org/lisp/org-protocol.el. It works perfectly for emacs-23.


For emacs-22 this does _not_ work, however.

The problem occurs, if `char-to-string' is called with an unicode
character. E.g.

   (char-to-string 8211)

perfectly returns a dash in emacs-23. `org-protocol-unhex-string' works
like a charme for texts like those on http://www.welcome2japan.cn/ - in
emacs-23.


If I evaluate the same expression in emacs-22, I get an error (see
backtrace below) and (prin1-char 8211) returns nil.



There must be a way to correctly decode multibyte characters in
emacs-22.




Thanks in advance,

  Sebastian




Debugger entered--Lisp error: (error "Invalid character: 8211, #o20023,
#x2013") char-to-string(8211)
  (concat ret (char-to-string sum))
  (setq ret (concat ret (char-to-string sum)))
  (progn (setq ret (concat ret ...)) (setq sum 0))
  (if (= 0 eat) (progn (setq ret ...) (setq sum 0)))
  (when (= 0 eat) (setq ret (concat ret ...)) (setq sum 0))
  (let* ((b ...) (a ...) (b ...) (c1 ...) (c2 ...) (val ...)
(shift ...) (xor ...)) (if (>= val 192) (setq eat shift)) (setq val
(logxor val xor)) (setq sum (+ ... val)) (if (> eat 0) (setq eat ...))
(when (= 0 eat) (setq ret ...) (setq sum 0))) (while bytes (let*
(... ... ... ... ... ... ... ...) (if ... ...) (setq val ...) (setq
sum ...) (if ... ...) (when ... ... ...))) (let* ((bytes ...) (ret "")
(eat 0) (sum 0)) (while bytes (let* ... ... ... ... ... ...)) ret)
org-protocol-unhex-compound("%20%E2%80%93%20") (let* ((start ...)
(end ...) (hex ...) (replacement ...)) (setq tmp (concat tmp ...
replacement)) (setq str (substring str end))) (while (string-match "\\(%
[0-9a-f][0-9a-f]\\)+" str) (let* (... ... ... ...) (setq tmp ...) (setq
str ...))) (let ((tmp "") (case-fold-search t)) (while (string-match "\
\(%[0-9a-f][0-9a-f]\\)+" str) (let* ... ... ...)) (setq tmp (concat tmp
str)) tmp) org-protocol-unhex-string("org-protocol.el%20%E2%80%93%
20Intercept%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions") mapcar(org-protocol-unhex-string ("http%3A%2F%2Forgmode.org%
2Fworg%2Forg-contrib%2Forg-protocol.php" "org-protocol.el%20%E2%80%93%
20Intercept%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions" "")) (if (fboundp unhexify) (mapcar unhexify split-parts)
(mapcar (quote org-protocol-unhex-string) split-parts)) (if unhexify
(if (fboundp unhexify) (mapcar unhexify split-parts) (mapcar ...
split-parts)) split-parts) (let* ((sep ...) (split-parts ...)) (if
unhexify (if ... ... ...) split-parts)) org-protocol-split-data("http%3A
%2F%2Forgmode.org%2Fworg%2Forg-contrib%
2Forg-protocol.php/org-protocol.el%20%E2%80%93%20Intercept%20calls%
20from%20emacsclient%20to%20trigger%20custom%20actions/" t) (let*
((parts ...) (template ...) (url ...) (type ...) (title ...)
(region ...) (orglink ...) remember-annotation-functions) (setq
org-stored-links (cons ... org-stored-links)) (kill-new orglink)
(org-store-link-props :type type :link url :description title :initial
region) (raise-frame) (org-remember nil (string-to-char template))) (if
(and (boundp ...) (fboundp ...)) (let* (... ... ... ... ... ... ...
remember-annotation-functions) (setq org-stored-links ...) (kill-new
orglink) (org-store-link-props :type type :link url :description
title :initial region) (raise-frame) (org-remember nil ...)) (message
"Org-mode not loaded.")) org-protocol-remember("http%3A%2F%2Forgmode.org
%2Fworg%2Forg-contrib%2Forg-protocol.php/org-protocol.el%20%E2%80%93%
20Intercept%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions/") funcall(org-protocol-remember "http%3A%2F%2Forgmode.org%
2Fworg%2Forg-contrib%2Forg-protocol.php/org-protocol.el%20%E2%80%93%
20Intercept%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions/") (throw (quote fname) (funcall func result)) (if greedy nil
(throw (quote fname) (funcall func result))) (unless greedy (throw
(quote fname) (funcall func result))) (progn (unless greedy
(throw ... ...)) (funcall func result) (throw (quote fname) t)) (if
(fboundp func) (progn (unless greedy ...) (funcall func result)
(throw ... t))) (when (fboundp func) (unless greedy (throw ... ...))
(funcall func result) (throw (quote fname) t)) (let* ((func ...)
(greedy ...) (splitted ...) (result ...)) (when
(plist-get ... :kill-client) (message "Greedy org-protocol handler.
Killing client.") (server-edit)) (when (fboundp func) (unless
greedy ...) (funcall func result) (throw ... t))) (progn (let*
(... ... ... ...) (when ... ... ...) (when ... ... ... ...))) (if
(string-match proto fname) (progn (let* ... ... ...))) (when
(string-match proto fname) (let* (... ... ... ...) (when ... ... ...)
(when ... ... ... ...))) (let ((proto ...)) (when (string-match proto
fname) (let* ... ... ...))) (while --cl-dolist-temp-- (setq prolist
(car --cl-dolist-temp--)) (let (...) (when ... ...)) (setq
--cl-dolist-temp-- (cdr --cl-dolist-temp--))) (let ((--cl-dolist-temp--
sub-protocols) prolist) (while --cl-dolist-temp-- (setq prolist ...)
(let ... ...) (setq --cl-dolist-temp-- ...)) nil) (catch (quote
--cl-block-nil--) (let (... prolist) (while
--cl-dolist-temp-- ... ... ...) nil)) (cl-block-wrapper (catch (quote
--cl-block-nil--) (let ... ... nil))) (block nil (let (... prolist)
(while --cl-dolist-temp-- ... ... ...) nil)) (dolist (prolist
sub-protocols) (let (...) (when ... ...))) (progn (dolist (prolist
sub-protocols) (let ... ...))) (if (string-match the-protocol fname)
(progn (dolist ... ...))) (when (string-match the-protocol fname)
(dolist (prolist sub-protocols) (let ... ...))) (let
((the-protocol ...)) (when (string-match the-protocol fname)
(dolist ... ...))) (catch (quote fname) (let (...) (when ... ...))
fname) (let ((sub-protocols ...)) (catch (quote fname) (let ... ...)
fname)) org-protocol-check-filename-for-protocol
("/home/andy/org-protocol:/remember:/http%3A%2F%2Forgmode.org%2Fworg%
2Forg-contrib%2Forg-protocol.php/org-protocol.el%20%E2%80%93%20Intercept
%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions/" (("/home/andy/org-protocol:/remember:/http%3A%2F%
2Forgmode.org%2Fworg%2Forg-contrib%2Forg-protocol.php/org-protocol.el%
20%E2%80%93%20Intercept%20calls%20from%20emacsclient%20to%20trigger%
20custom%20actions/" 1 0)) (#<process server <*8*>>)) byte-code
(<bytecode removed> [flist var --cl-dolist-temp-- fname client files
nil expand-file-name org-protocol-check-filename-for-protocol t throw
greedy delq] 5) server-visit-files
((("/home/andy/org-protocol:/remember:/http%3A%2F%2Forgmode.org%2Fworg%
2Forg-contrib%2Forg-protocol.php/org-protocol.el%20%E2%80%93%20Intercept
%20calls%20from%20emacsclient%20to%20trigger%20custom%20actions/" 1 0))
(#<process server <*8*>>) nil) byte-code(<bytecode removed> [proc
string prev --cl-proc-- default-enable-multibyte-characters
file-name-coding-system process-get :authenticated string-match "-auth \
\(.*?\\)\n" match-string 1 :auth-key 0 nil process-put t server-log
"Authentication successful" "Authentication failed" process-send-string
delete-process throw
--cl-block-server-process-filter-- :previous-string recursion-depth
run-with-timer make-symbol "--proc--" lambda (&rest --cl-rest--) apply #
[(G47000) <bytecode removed> [G47000 server-process-filter ""] 3] quote
--cl-rest-- top-level (byte-code <bytecode reoved> [mapc #[...
<bytecode removed> [buffer isearch-mode boundp isearch-cancel] 2]
buffer-list] 3) ((quit ...)) "\n" "[^ ]* " "-nowait" "-eval" "-display"
"\\([^ ]*\\) " server-unquote-arg err (byte-code <bytecode removed>
[display tmp-frame server-select-display] 2) ((error ...)) "\\`\\+[0-9]+
\\'" string-to-number ...] 10) server-process-filter(#<process server
<*8*>> "/home/andy/org-protocol://remember://http%3A%2F%2Forgmode.org%
2Fworg%2Forg-contrib%2Forg-protocol.php/org-protocol.el%20%E2%80%93%
20Intercept%20calls%20from%20emacsclient%20to%20trigger%20custom%
20actions/ \n")