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List:       serdev
Subject:    Re: [sr-dev] question about SWITCH statement
From:       Andrei Pelinescu-Onciul <andrei () iptel ! org>
Date:       2010-02-24 11:46:07
Message-ID: 20100224114603.GP1646 () shell ! iptel ! org
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On Feb 24, 2010 at 09:35, Klaus Feichtinger <klaus.feichtinger@gmx.net> wrote:
> Hello,
> 
> I have a question regarding the "SWITCH" statement from the core of
> sip-router / kamailio.
> 
> In the news publication
> (http://www.kamailio.org/dokuwiki/doku.php/features:new-in-3.0.x) I found a
> description that the switch statement now supports "regular expression for
> matching string".
> 
> However, when I try the example (as displayed on the wiki page) I get
> different error messages. The example that I've tested looks like:
> 
> switch($rU) {
> 	case /^123/:
> 		sl_send_reply("200", "yippie - ^123 works");
> 	case /^124.*/:
> 		sl_send_reply("200", "yippie - ^124.* works");
> 	break;
> }

The example is wrong (I'll fix it).
It should be:
    case /"^123":

/^123/ is interpreted as a bad integer expression.

So use quotes and no ending '/'.

BTW: case /"^1"+"2"+"3":   will work too (any expression resulting in a
 static string will do).

> 
> Worst case was using the first case with the case label "/^123/".
> That resulted in a segmentation fault (!) with following error messages:
> 
> loading modules under /usr/lib/kamailio/
> 0(23229) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 374, column 16: syntax error
> 0(23229) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 374, column 16: bad expression
> Segmentation fault

Yes, it's some parse error gone wrong (I'll fix it too).
> 
> When I added ".*" to /^123/ as in case "/^124.*/" the error message was:
> loading modules under /usr/lib/kamailio/
> 0(23256) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 374, column 15: syntax error
> 0(23256) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 374, column 15: bad case label
> 0(23256) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 374, column 15: bad case
> 0(23256) : <core> [cfg.y:3329]: parse error in config file
> /usr/local/etc/kamailio/kamailio.cfg, line 379, column 5: bad switch body
> 
> What does sip-router / kamailio now REALLY support? Is the information about RegEx \
> a mistake on the web page or is only the syntax wrong? However, in the CoreCookbook \
> no entry can be found regarding RegEx for switch statement......

Only the syntax is wrong.

Andrei

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