Is this allowed by the C standard? And where is this documented? On Mon, 2013-04-29 at 08:14 +0400, Nikolay Sivov wrote: > On 4/29/2013 07:59, Nikita Churaev wrote: > > No it's not. > > > > http://xmlsoft.org/html/libxml-tree.html#xmlDoc > > > > http://xmlsoft.org/html/libxml-tree.html#xmlNode > > > > xmlDoc has int compression instead of xmlNode's xmlNs > I see what you mean. All node types are using same layout containing basic > stuff to link node in a tree - up to 'doc' field. That's what a comment > in tree.h means: > > --- > struct _xmlNode { > void *_private; /* application data */ > xmlElementType type; /* type number, must be second ! */ > const xmlChar *name; /* the name of the node, or the entity */ > struct _xmlNode *children; /* parent->childs link */ > struct _xmlNode *last; /* last child link */ > struct _xmlNode *parent; /* child->parent link */ > struct _xmlNode *next; /* next sibling link */ > struct _xmlNode *prev; /* previous sibling link */ > struct _xmlDoc *doc; /* the containing document */ > > /* End of common part */ > --- > > So to be clean with casting it should have some sort of header struct > containing these fields only, > and have every node type start with this header, it's just not done this > way. To be safe you always > need to check type and cast appropriately. > > > > On Mon, 2013-04-29 at 07:48 +0400, Nikolay Sivov wrote: > >> On 4/29/2013 07:30, Nikita Churaev wrote: > >>> #include <libxml/parser.h> > >>> #include <libxml/tree.h> > >>> #include <stdio.h> > >>> > >>> int > >>> main (int argc, char** argv) > >>> { > >>> xmlDocPtr doc = xmlReadMemory("<doc/>", 6, "egg.xml", NULL, 0); > >>> > >>> /* XmlNode */ /* XmlDoc */ > >>> printf("%s\n", (doc->children->parent == doc) ? "true" : "false"); > >>> return 0; > >>> } > >>> > >>> This gives out "true"... Why? xmlNode.parent is xmlNodePtr... So I can't > >>> just rely on xmlNode pointers to actually point to xmlNode? > >> Just take a look what xmlDocPtr actually is - document is also a node. > >>> I looked all > >>> around the API reference and tutorials and found nothing on this topic. > >>> > >>> _______________________________________________ > >>> xml mailing list, project page http://xmlsoft.org/ > >>> xml@gnome.org > >>> https://mail.gnome.org/mailman/listinfo/xml > >>> > >> _______________________________________________ > >> xml mailing list, project page http://xmlsoft.org/ > >> xml@gnome.org > >> https://mail.gnome.org/mailman/listinfo/xml > > > > _______________________________________________ > > xml mailing list, project page http://xmlsoft.org/ > > xml@gnome.org > > https://mail.gnome.org/mailman/listinfo/xml > > > > _______________________________________________ > xml mailing list, project page http://xmlsoft.org/ > xml@gnome.org > https://mail.gnome.org/mailman/listinfo/xml
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