patch: broken docstrings for functions from .elc.gz's

[Ivan Zakharyaschev <imz@altlinux.org>]

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	Hello!

A bug in Emacs 21.2 (and 21.3) has been reported by Sergey
Vlasov (a patch that aims to fix it is attached):

having life.elc compressed:

/usr/share/emacs/21.3/lisp/play/life.elc.gz

sometimes results in a broken docstring for `life'. More
precisely:

After Emacs startup:

C-h f life RET (the doc for the autoloaded function is fine)

M-: (load "/usr/share/emacs/21.3/lisp/play/life.elc.gz") RET
C-h f life RET (the full doc is fine)

M-: (load "/usr/share/emacs/21.3/lisp/play/life") RET
C-h f life RET (the doc is broken)

Debugging shows that `jka-compr-load' is called in the first
case, but it isn't called in the second one. Modifying a test in
src/lread.c fixes this bad behaviour.

Usually libraries are loaded in a way similar to the second case,
so usually the docstrings get broken.


As I can see from the CVS, the issue is still there in the main
Emacs development branch. The patch is for 21.3. (There is a
description of it inside.)


Regards,
-- 
Ivan Zakharyaschev
ALT Linux Team member
I'm a Sisyphus developer: it's core is GNU/Linux
http://www.altlinux.ru, http://www.altlinux.com

JID: imz at altlinux.org

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At this place, We can find a real file with suffixed filename (`fn')
that needs to be handled in a special way (e.g. a compressed 
one: "/a.elc.gz") while `filename' holds the requested 
filename without the suffix ("/a").

In this case, the file shouldn't be opened and the function (openp())
should not return the fd. It should return -2, and the calling 
function (load()) should call the corresponding handler in order
to load it.

It used to check whether there is a special handler by passing `filename'.
Such a test used not to give the expected result, since the handler
is applicable to the real (suffixed) found filename `fn'.

Loading libraries stored as compressed .elc-files used to be broken 
because of this: the corresponding load-handler (`jka-compr-load') 
used not be called, and the docstrings for the loaded functions
got corrupted when displayed.

Ivan Zakharyaschev <imz@altlinux.org>

--- emacs-21.3/src/lread.c.handleLoad	2003-03-30 13:22:31 +0400
+++ emacs-21.3/src/lread.c	2003-03-30 13:24:02 +0400
@@ -1012,7 +1012,7 @@
 	  if (absolute)
 	    handler = Qnil;
 	  else
-	    handler = Ffind_file_name_handler (filename, Qfile_exists_p);
+	    handler = Ffind_file_name_handler (build_string (fn), Qfile_exists_p);
 	  if (! NILP (handler) && ! exec_only)
 	    {
 	      int exists;

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