On 2/26/19 11:08 AM, Peter Krempa wrote:
> Quite a few parts modify the XPath context current node to shif the
shift
> scope and allow easier queries. This also means that the node needs
> to be restored afterwards.
>
> Introduce a macro based on 'VIR_AUTOCLEAN' which adds a local structure
> on the stack remembering the original node along with a function which
> will make sure that the node is reset when the local structure leaves
> scope.
>
> Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
> ---
> src/libvirt_private.syms | 1 +
> src/util/virxml.c | 10 ++++++++++
> src/util/virxml.h | 22 ++++++++++++++++++++++
> 3 files changed, 33 insertions(+)
Nice idea.
> +/**
> + * VIR_XPATH_NODE_AUTORESTORE:
> + * @ctxt: XML XPath context pointer
> + *
> + * This macro ensures that when the scope where it's used ends @ctxt's current
Reads better with s/ends/ends,/
> + * 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}
Worth using C99 syntax as in { .ctxt = (ctxt), .node = (ctxt)->node, } ?
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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