diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index e68e3f3a3b..770a921357 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -3247,6 +3247,7 @@ virXMLValidatorFree; virXMLValidatorInit; virXMLValidatorValidate; virXPathBoolean; +virXPathContextNodeRestore; virXPathInt; virXPathLong; virXPathLongHex; diff --git a/src/util/virxml.c b/src/util/virxml.c index 8eb201fddf..f55b9a362c 100644 --- a/src/util/virxml.c +++ b/src/util/virxml.c @@ -1398,3 +1398,13 @@ virXMLFormatElement(virBufferPtr buf, virBufferFreeAndReset(childBuf); return ret; } + + +void +virXPathContextNodeRestore(virXPathContextNodeSavePtr save) +{ + if (!save->ctxt) + return; + + save->ctxt->node = save->node; +} diff --git a/src/util/virxml.h b/src/util/virxml.h index 23a4da1b7e..78a1e7fa5e 100644 --- a/src/util/virxml.h +++ b/src/util/virxml.h @@ -219,4 +219,28 @@ virXMLFormatElement(virBufferPtr buf, virBufferPtr attrBuf, virBufferPtr childBuf); +struct _virXPathContextNodeSave { + xmlXPathContextPtr ctxt; + xmlNodePtr node; +}; +typedef struct _virXPathContextNodeSave virXPathContextNodeSave; +typedef virXPathContextNodeSave *virXPathContextNodeSavePtr; + +void +virXPathContextNodeRestore(virXPathContextNodeSavePtr save); + +VIR_DEFINE_AUTOCLEAN_FUNC(virXPathContextNodeSave, virXPathContextNodeRestore); + +/** + * VIR_XPATH_NODE_AUTORESTORE: + * @ctxt: XML XPath context pointer + * + * This macro ensures that when the scope where it's used ends, @ctxt's current + * node pointer is reset to the original value when this macro was used. + */ +# define VIR_XPATH_NODE_AUTORESTORE(_ctxt) \ + VIR_AUTOCLEAN(virXPathContextNodeSave) _ctxt ## CtxtSave = { .ctxt = _ctxt,\ + .node = _ctxt->node}; \ + ignore_value(&_ctxt ## CtxtSave) + #endif /* LIBVIRT_VIRXML_H */