util: introduce virXMLNamespaceFormatNS

A function to automatically format the xmlns:<prefix>='<uri>'
attribute for per-driver namespaces.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/util/virxml.c

@@ -1408,3 +1408,11 @@ virXPathContextNodeRestore(virXPathContextNodeSavePtr save)
 
     save->ctxt->node = save->node;
 }
+
+
+void
+virXMLNamespaceFormatNS(virBufferPtr buf,
+                        virXMLNamespace const *ns)
+{
+    virBufferAsprintf(buf, " xmlns:%s='%s'", ns->prefix, ns->href());
+}

src/util/virxml.h

@@ -261,3 +261,7 @@ struct _virXMLNamespace {
 };
 typedef struct _virXMLNamespace virXMLNamespace;
 typedef virXMLNamespace *virXMLNamespacePtr;
+
+void
+virXMLNamespaceFormatNS(virBufferPtr buf,
+                        virXMLNamespace const *ns);