Text transformations s.select and newline char - sr-users

17 May 2021

Hello,

I am simply trying to parse a SDP body, read it line by line and save the line into a
variable for further processing. It seems when using a newline \n as the delimiter it
breaks down with errors. How should I treat this issue and properly managed the newline as
delimiter?

May 17 12:00:00 ip-10-120-120-12 kamailio[12878]:  0(12878) ERROR: pv [pv_trans.c:2326]:
tr_parse_string(): invalid select transformation: select,$var(i),$var(delimeter)}!!
May 17 12:00:00 ip-10-120-120-12 kamailio[12878]:  0(12878) ERROR: <core>
[core/pvapi.c:1717]: tr_lookup(): error parsing [{s.select,$var(i),$var(delimeter)}]

Block extracted from .cfg

sdp_get("$avp(sdp)");
$avp(lines) = $(avp(sdp){line.count});
$var(delimeter) = "\n";

$var(i) = 0;
while($var(i) < $avp(lines)) {

        # This works
        xlog("L_INFO", "==> Position $var(i):
$(avp(sdp){s.select,$var(i),\n}) \n");

        # This fails
        $var(l1) = $(avp(sdp){s.select,$var(i),$var(delimeter)});

        # This fails
        $var(l2) = $(avp(sdp){s.select,$var(i),\n});

        # This fails
        $var(l3) = $(avp(sdp){s.select,$var(i),\\n});

        # Supposed to do something funny with the $var(line) here

        $var(i) = $var(i) + 1;

}

/M