Function xmlDOMWrapNSNormDeclareNsForced

ThirdParty/libxml2/vtklibxml2/tree.c:8473–8531

* xmlDOMWrapNSNormDeclareNsForced: * @doc: the doc * @elem: the element-node to declare on * @nsName: the namespace-name of the ns-decl * @prefix: the preferred prefix of the ns-decl * @checkShadow: ensure that the new ns-decl doesn't shadow ancestor ns-decls * * Declares a new namespace on @elem. It tries to use the * given @prefix; if a ns-decl with the given prefix is already existent * on @ele

*         and internal errors.
*/
static xmlNsPtr
xmlDOMWrapNSNormDeclareNsForced(xmlDocPtr doc,
				xmlNodePtr elem,
				const xmlChar *nsName,
				const xmlChar *prefix,
				int checkShadow)
{

    xmlNsPtr ret;
    char buf[50];
    const xmlChar *pref;
    int counter = 0;

    if ((doc == NULL) || (elem == NULL) || (elem->type != XML_ELEMENT_NODE))
        return(NULL);
    /*
    * Create a ns-decl on @anchor.
    */
    pref = prefix;
    while (1) {
	/*
	* Lookup whether the prefix is unused in elem's ns-decls.
	*/
	if ((elem->nsDef != NULL) &&
	    (xmlTreeNSListLookupByPrefix(elem->nsDef, pref) != NULL))
	    goto ns_next_prefix;
	if (checkShadow && elem->parent &&
	    ((xmlNodePtr) elem->parent->doc != elem->parent)) {
	    /*
	    * Does it shadow ancestor ns-decls?
	    */
	    if (xmlSearchNsByPrefixStrict(doc, elem->parent, pref, NULL) == 1)
		goto ns_next_prefix;
	}
	ret = xmlNewNs(NULL, nsName, pref);
	if (ret == NULL)
	    return (NULL);
	if (elem->nsDef == NULL)
	    elem->nsDef = ret;
	else {
	    xmlNsPtr ns2 = elem->nsDef;
	    while (ns2->next != NULL)
		ns2 = ns2->next;
	    ns2->next = ret;
	}
	return (ret);
ns_next_prefix:
	counter++;
	if (counter > 1000)
	    return (NULL);
	if (prefix == NULL) {
	    snprintf((char *) buf, sizeof(buf),
		"ns_%d", counter);
	} else
	    snprintf((char *) buf, sizeof(buf),
	    "%.30s_%d", (char *)prefix, counter);
	pref = BAD_CAST buf;
    }