Re: [xml] Memory leak problem

[BR Chrisman <brchrisman gmail com>]

On Sat, Nov 23, 2019 at 10:04 AM Eric Eberhard <flash vicsmba com> wrote:
> I have used libxml2 since it was libxml so I can’t believe I am having this problem.  I’m looking for 
> someone smarter than me to help out.
>
>
>
> I use only the DOM (memory) parser, and an old version at that:  libxml2-2.7.3
>
>
>
> I have a program that makes many XML files.  They, alone, are not a problem.  But when a large amount are 
> made (100s) it gets a memory error.
>
>
>
> After each XML document I make I write them to disk and then free them (meaning I thought I was freeing ALL 
> the memory).  This is not the case so I assume I am not coding it correctly.  This is what I am doing …

Hi Eric,

I think you should be able to use xmlFreeDoc on the doc object, rather
than on any particular node.
One call to that cleans the whole document up.
I have looped this under valgrind before with no issues found.

- Brian Chrisman

> The node is passed to this function  (xmlNodePtr) named freeMe(xmlNsPtr node)
>
>
>
> Void freeMe(xmlNSPtr node) {
>
>
>
> xmlNsPtr next;
>
>  xmlNsPtr cur;
>
>
>
>  cur = node->ns;
>
>  while (cur) {
>
>      next = cur->next;
>
>       if (cur->href) xmlFree((char *) cur->href);
>
>       if (cur->prefix) xmlFree((char *) cur->prefix);
>
>       cur->href = NULL;
>
>       cur->prefix = NULL;
>
>        xmlFree((char *)cur);
>
>       cur = next;
>
> }
>
> node->ns = NULL;
>
>
>
> if (node->type == XML_ELEMENT_NODE ||
>
>      node->type == XML_XINCLUDE_START ||
>
>                               node->type == XML_XINCLUDE_END) {
>
>      cur = node->nsDef;
>
>      while (cur) {
>
>              next = cur->next;
>
>               if (cur->href) xmlFree((char *) cur->href);
>
>                if (cur->prefix) xmlFree((char *) cur->prefix
>
>                cur->href = NULL;
>
>                cur->prefix = NULL;
>
>                xmlFree((char *)cur);
>
>              cur = next;
>
>      }
>
>      node->nsDef = NULL;
>
>     If (node->children)
>
> FreeMe(node->children);                            //recursive
>
> }
>
>
>
> xmlFreeDoc(node);
>
>
>
> //done I think freeing up all memory
>
>
>
> I LEFT out the tests for NULLS and error checking and other silly things so it would not be too long.
>
>
>
> It also repeats mostly the exact same code if the node is NS so I won’t bore you.  Don’t use NS much anyway.
>
>
>
> Problem is, something is not free()’d up.
>
>
>
> So besides the main node and NS is there something else I have to free()?  Better, is there a function that 
> I can pass the node and it free()’s everything for me?
>
>
>
> Any help – even sample code – would be much appreciated!  Free horse back ride in AZ for a winner?
>
>
>
> E
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> Eric S Eberhard
>
> VICS (Vertical Integrated Computer Systems)
>
> Voice: 928 567 3529
>
> Cell    : 928 301 7537  (not reliable except for text or if not home)
>
> 2933 W Middle Verde Rd
>
> Camp Verde, AZ  86322
>
>
>
> Oh – help me out and please join this group.  I need to get large numbers of members to take to the 
> politicians.  https://www.facebook.com/groups/286143052248115/
>
> This might work to just join?
>
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