Function xmlNewNs

ThirdParty/libxml2/vtklibxml2/tree.c:721–775

* xmlNewNs: * @node: the element carrying the namespace (optional) * @href: the URI associated * @prefix: the prefix for the namespace (optional) * * Create a new namespace. For a default namespace, @prefix should be * NULL. The namespace URI in @href is not checked. You should make sure * to pass a valid URI. * * If @node is provided, it must be an element node. The namespace will *

 * the prefix is already in use or a memory allocation failed.
 */
xmlNsPtr
xmlNewNs(xmlNodePtr node, const xmlChar *href, const xmlChar *prefix) {
    xmlNsPtr cur;

    if ((node != NULL) && (node->type != XML_ELEMENT_NODE))
	return(NULL);

    /*
     * Allocate a new Namespace and fill the fields.
     */
    cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
    if (cur == NULL)
	return(NULL);
    memset(cur, 0, sizeof(xmlNs));
    cur->type = XML_LOCAL_NAMESPACE;

    if (href != NULL) {
	cur->href = xmlStrdup(href);
        if (cur->href == NULL)
            goto error;
    }
    if (prefix != NULL) {
	cur->prefix = xmlStrdup(prefix);
        if (cur->prefix == NULL)
            goto error;
    }

    /*
     * Add it at the end to preserve parsing order ...
     * and checks for existing use of the prefix
     */
    if (node != NULL) {
	if (node->nsDef == NULL) {
	    node->nsDef = cur;
	} else {
	    xmlNsPtr prev = node->nsDef;

	    if ((xmlStrEqual(prev->prefix, cur->prefix)) &&
                (prev->href != NULL))
                goto error;
	    while (prev->next != NULL) {
	        prev = prev->next;
		if ((xmlStrEqual(prev->prefix, cur->prefix)) &&
                    (prev->href != NULL))
                    goto error;
	    }
	    prev->next = cur;
	}
    }
    return(cur);

error:
    xmlFreeNs(cur);
    return(NULL);
}

/**
 * xmlSetNs: