[SR-Users] How to determine size (number of elements) in xavp stack?

[Chaigneau, Nicolas]

A C function already exists for that: xavp_count.
Hereafter, the code for a PV that I added to a custom module to do the job.



static pv_export_t mod_pvs[] = {
	{STR_STATIC_INIT("xavp_size"), PVT_OTHER, pv_getf_xavp_size, 0, pv_parse_string, 0, 0, 0},
	/* Usage: $xavp_size( name );
	 * Get the number of rows stored in xavp "name".
	 * Result is integer: the number of rows.
	 */

	{ {0, 0}, 0, 0, 0, 0, 0, 0, 0 }
};


/**
 * Get the number of rows stored in an xavp.
 */
static int pv_getf_xavp_size(struct sip_msg *msg, pv_param_t *param, pv_value_t *res)
{
	if (msg == NULL || param == NULL || param->pvn.type != PV_NAME_INTSTR) {
		LM_ERR("Invalid parameters\n");
		return -1;
	}

	int c = xavp_count(&param->pvn.u.isname.name.s, NULL);

	return pv_get_sintval(msg, param, res, c);
}

/**
 * Invoked upon server startup.
 * Parse "<name>" and store the string.
 */
static int pv_parse_string(pv_spec_p sp, str *in)
{
	if (sp == NULL || in == NULL || in->len <= 0) {
		LM_ERR("Invalid parameters\n");
		return -1;
	}

	LM_DBG("in: [%.*s]\n", in->len, in->s);

	str pvs;
	pvs = *in;
	trim(&pvs);

	sp->pvp.pvn.type = PV_NAME_INTSTR;
	sp->pvp.pvn.u.isname.type = AVP_NAME_STR;
	sp->pvp.pvn.u.isname.name.s = pvs;

	return 0;
}



-----Message d'origine-----
De : sr-users <sr-users-bounces at lists.kamailio.org> De la part de Daniel-Constantin Mierla
Envoyé : mardi 9 novembre 2021 08:33
À : Kamailio (SER) - Users Mailing List; Benoît Panizzon
Objet : Re: [SR-Users] How to determine size (number of elements) in xavp stack?

***This mail has been sent by an external source***

Hello,

I do not remember any function to count xavps at this moment, it can be added of course if someone wants to make a pull request. Otherwise, the options is looping with index through all xavps for the name you want. A c function will have to do the same, internally there is no field keeping the number of avp/xavp with same name.

Cheers,
Daniel

On 08.11.21 16:21, Benoît Panizzon wrote:
> Dear Community
>
> In my previous post I mentioned my problem with sql_xquery
>
> I fear I used this wrong.
>
> $dbr is probably only populated if sql_query is used. Anyway, it is 
> always 0 in my testings, even if I clearly get a result.
>
> Now I would like to know how many results I have. How can I determine 
> the size of an $xavp stack (or array)?
>
> Or is there another way to get the number of rows returned by a 
> sql_xquery without looping an index through all rows?
>
> --
> Mit freundlichen Grüssen
>
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