I'm quite new to libxml usage, but it seems to be a handy way to deal with XML
documents solving my problem. I thought at least :-)
My little problem to solve: I'm getting some input XML doc (each with one out
of several possible root elements) , shall wrap this into a "cover document" by
adding some control information to it and hand over the "wrapper XML" to the
next processing step.
For a proof of concept I've been starting with this:
doc_in = xmlReadMemory(msg_xml, strlen(msg_xml), NULL, NULL, 0);
root_node_in = xmlDocGetRootElement(doc_in);
doc = xmlNewDoc(BAD_CAST "1.0");
root_node = xmlNewNode(NULL, BAD_CAST "received");
xmlNewProp(root_node, BAD_CAST "time", BAD_CAST "2017-03-01 17:57:21");
xmlNewProp(root_node, BAD_CAST "from", BAD_CAST "32");
xmlNewProp(root_node, BAD_CAST "type", BAD_CAST "control");
xmlDocSetRootElement(doc, root_node);
/* now add extracted node from input to new doc */
xmlAddChild(root_node, root_node_in); /* <<--- causes the problem */
/* show me result */
xmlDocDump(stdout, doc_in);
xmlDocDump(stdout, doc);
xmlFreeDoc(doc); /* <<--- where it crashes */
the result is perfectly fitting my expectations, till I hit the xmlDocFree
statement giving me
*** Error in `./main2': free(): invalid pointer: 0x099680de ***
Aborted (core dumped)
I've tried to check every pointer, the one indicated isn't visible to me at
all...
>From value range my expectation is it's somewhere in the control structure of
>doc.
If I leave out the node insertion there is no error on freeing the doc(s).
To be honest I have no clue what I'm doing wrong, but it seems I haven't
understood internal behavior of libxml yet :-(
Any helpful ideas? Is there be a better way doing this?
I'm trying not to produce much overhead and trying not to parse XML myself ;-)
Thanks,
Heinz
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