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util: xml: Introduce VIR_XPATH_NODE_AUTORESTORE_NAME

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VIR_XPATH_NODE_AUTORESTORE_NAME is a more generic version of the
VIR_XPATH_NODE_AUTORESTORE macro used to save the 'node' inside a XPath
context struct. The new macro allows specifying the name of the variable
used to save the context so that it can be used multiple times inside a
function's nested scopes.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-09-16 17:19:44 +02:00
parent d9b8d0c6bd
commit ad29c254b6
1 changed files with 15 additions and 4 deletions
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19
src/util/virxml.h
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@ -379,6 +379,20 @@ virXPathContextNodeRestore(virXPathContextNodeSave *save);
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(virXPathContextNodeSave, virXPathContextNodeRestore);
/**
* VIR_XPATH_NODE_AUTORESTORE_NAME:
* @name: name of the temporary variable used to save @ctxt
* @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. The
* context is saved into a variable named @name;
*/
#define VIR_XPATH_NODE_AUTORESTORE_NAME(_name, _ctxt) \
VIR_WARNINGS_NO_UNUSED_VARIABLE \
g_auto(virXPathContextNodeSave) _name = { .ctxt = _ctxt,\
.node = _ctxt->node}; \
VIR_WARNINGS_RESET
/**
* VIR_XPATH_NODE_AUTORESTORE:
* @ctxt: XML XPath context pointer
@ -387,10 +401,7 @@ G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(virXPathContextNodeSave, virXPathContextNodeRes
* node pointer is reset to the original value when this macro was used.
*/
#define VIR_XPATH_NODE_AUTORESTORE(_ctxt) \
VIR_WARNINGS_NO_UNUSED_VARIABLE \
g_auto(virXPathContextNodeSave) _ctxt ## CtxtSave = { .ctxt = _ctxt,\
.node = _ctxt->node}; \
VIR_WARNINGS_RESET
VIR_XPATH_NODE_AUTORESTORE_NAME(_ctxt ## CtxtSave, _ctxt)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(xmlDoc, xmlFreeDoc);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(xmlXPathContext, xmlXPathFreeContext);