On Fri, Sep 10, 2010 at 11:37 AM, Stephen J. Turnbull <stephen@xemacs.org>wrote:

> Shenli Zhu writes:
>
>  > Is there any help function to display form, etc?
>
> Yes.  Type "help user" to gdb for an annotated list.  If you don't
> understand how to use them from that list, or need help interpreting
> results, please ask specifically.
>
>  > And is there any instruction files on hacking C files?
>
> For advice on writing code, as far as I know there is a little bit in
> the Emacs Lisp Reference, and for the general structure of C support
> for Lisp, online there's
>
>    http://www.xemacs.org/Documentation/21.5/html/internals.html
>
> Warning: Emacs and XEmacs redisplays are completely different, as are
> text properties and extents.  The Lisp language implementation is
> pretty similar, as are the buffer and string structures.  (You need to
> be a little careful with text as XEmacs still uses Mule code
> internally, but it has the same formal properties, eg, finding
> character boundaries in O(1), etc, and many of the same higher-level
> APIs for actually handling encoding as used in Emacs.)
>
> For the style you should use in writing code, there is the GNU coding
> standard, which I believe is distributed somewhere with Emacs.  If
> not, you can install XEmacs and throw away everything except the
> "standards.info" file. :-)  (Sorry, we don't provide an online
> version.  Probably somewhere on the GNU site?)
>

Hi Stephen, it's what I need, thank you.