Re: [xml] Iterating over a node set

[Holger Rauch <holger rauch heitec de>]

Hi Daniel!

First of all, thanks a lot for your hint!

On Thu, 09 Jan 2003, Daniel Veillard wrote:

> [...] 
>   You did not indicate the way you increment or guard for xpath_items

Well, I (wrongly) had the impression that simply checking for *xpath_items
was enough since I expected xpath_items to be NULL-terminated, which it
obviously isn't.

> [...] 
> struct _xmlNodeSet {
>     int nodeNr;                 /* number of nodes in the set */
>     int nodeMax;                /* size of the array as allocated */
>     xmlNodePtr *nodeTab;        /* array of nodes in no particular order */
> };

What's the reason for the distinction between nodeNr and nodeMax? When I
checked their values using a debugger they contained the same values (my
node set consisted of 10 elements, indicated by both nodeNr and nodeMax).
 
> You're doing illegal memory accesses by accessing after the last element.

Yes, because my condition in the while loop didn't work (node set was *not*
NULL-terminated on Solaris) and because I didn't know that I should have
rather used nodeNr in my while loop.

> You're just lucky it doesn't crash on i386

Well, on my Debian 3.0 (glibc 2.2.5 based) system, the node set indeed was
NULL-terminated, so everything worked well. What I don't understand here why
is it NULL-terminated on one architecture (i386) and not on another (Sun
SPARC)?

Conclusion: I'm now aware that I simply used a data structure in the
wrong way.

Any info will be greatly appreciated!

Greetings,

        Holger