Re: [xml] xmlHashScan and *data argument

["William M. Brack" <wbrack mmm com hk>]

Melvyn Sopacua said:
> On Sunday 19 October 2003 23:43, Daniel Veillard wrote:
> > On Sun, Oct 19, 2003 at 11:31:54PM +0200, Melvyn Sopacua wrote:
<snip>

> I still don't get why xmlDumpElementDecl accepts buf as first
> argument while
> it is an xmlHashScanner on an xmlElementTable - the same as I'm
> doing.
>
> I won't dwell on it, but if you can explain it, I can sleep better
> ;)
>
> > > Further investigation shows that xmlSchemaTypeDump in
> > xmlschema.c indeed
> > > has the argument order you list and swapping the arguments in my
> > function
> > > works.
> >
> >   Okay, normal. There is actually  3rd argument passed if you look
> > at the
> > declaration of xmlHashScanner() in libxml/hash.h

hmmmm..... This thread has gotten my poor mind all twisted.  It
certainly seems to me that Melvyn has a "valid" point concerning the
scan callbacks for dumping data in valid.c.  Let's see... the
function def for the scanner callback is:

/**
 * xmlHashScanner:
 * @payload:  the data in the hash
 * @data:  extra scannner data
 * @name:  the name associated
 *
 * Callback when scanning data in a hash with the simple scanner.
 */
typedef void (*xmlHashScanner)(void *payload, void *data, xmlChar
*name);

while the callback function in valid.c has:

/**
 * xmlDumpElementDecl:
 * @buf:  the XML buffer output
 * @elem:  An element table
 *
 * This will dump the content of the element declaration as an XML
 * DTD definition
 */
void
xmlDumpElementDecl(xmlBufferPtr buf, xmlElementPtr elem) {

and the corresponding callback function in xmlschemas.c has:

/**
 * xmlSchemaTypeDump:
 * @output:  the file output
 * @type:  a type structure
 *
 * Dump a SchemaType structure
 */
static void
xmlSchemaTypeDump(xmlSchemaTypePtr type, FILE * output)

It certainly looks as though it's worth reviewing the valid.c code....

Bill