Function _pv_get_tm_branch_field

modules/tm/tm.c:2553–2691

static inline int _pv_get_tm_branch_field(struct sip_msg *msg,
								pv_param_t *param, pv_value_t *res, int field)
{
	struct cell *t;
	int idx, idxf;
	int_str attr_val;
	int attr_name;
	unsigned short attr_flags;
	struct usr_avp **old_list, *avp;
	int active_indexing = 0;

	if(msg==NULL || res==NULL)
		return -1;

	t = get_t();
	if (t==NULL || t==T_UNDEFINED)
		return -1;

	/* get the index */
	if (param->pvn.type & BRANCH_IDX_ACTIVE_MASK) {
		active_indexing = 1;
		param->pvn.type &= ~BRANCH_IDX_ACTIVE_MASK;
	}
	if (pv_get_spec_index(msg, param, &idx, &idxf)!=0) {
		LM_ERR("invalid index\n");
		return -1;
	}

	if (idxf==PV_IDX_ALL) {
		LM_ERR("STAR/ALL index not supported\n");
		return -1;
	}

	if (idxf==0 && idx==0) {
		/* no index used at all, return for the current branch */
		idx = get_branch_index();
	} else {
		/* must be numerical index */
		if (active_indexing)
			idx += t->first_branch;
		if (idx<0) {
			/* index from the end */
			if (-idx > t->nr_of_outgoings) /* underflow */
				return pv_get_null(NULL, NULL, res);
			idx = t->nr_of_outgoings + idx;
		} else
		if (idx >= t->nr_of_outgoings) /*overflow*/
			return pv_get_null(NULL, NULL, res);
	}

	/* we have a valid TM-branch index now */
	switch (field) {
		case BR_URI_ID: /* return URI */
			res->rs = TM_BRANCH(t,idx).uri;
			res->flags = PV_VAL_STR;
			break;
		case BR_Q_ID: /* return Q */
			res->rs.s = q2str(TM_BRANCH(t,idx).q, (unsigned int*)&res->rs.len);