[sr-dev] testing function result in if-statement

[Daniel-Constantin Mierla]

I think I looked at it several years ago and the situation is a bit
complex given the way the config script interpreter is doing the
evaluation -- there are the rules that return 0 means exit, negative
values are evaluated to false and positive to true. Because of these, at
different layers, the actual return values are lost and only the
equivalent of true/false in C are propagated. I would not go myself in
doing it, it doesn't bring much without large impact in the code -- the
alternative is quite simple:

func();

if($rc == y) {

}

Also, if one wants to use the other scripting laguages like Lua, Python,
JavaScript starting with v5.0 (through so called kemi framework), this
is practically there already. The exported functions to kemi are not in
pair with what's in kamailio.cfg native interpreter, but I hope to have
it in pair for next v5.1. Also, the JS module app_jsdt doesn't have any
external dependency, we embed its interpreter and that is practically
only the ECMA script language, so the basics of the scripting languages
(defining functions, executing them and the support for variables and
expressions/statements, plus core language operations on numbers,
lists/arrays and string values).

Cheers,
Daniel

On 08.04.17 12:01, Juha Heinanen wrote:
> I noticed that function result cannot be directly tested in
> if-statement:
>
>   if (func_x() == y) ...
>
> Why is that?  Should I open a feature request or is it a no-go?
>
> -- Juha
>

-- 
Daniel-Constantin Mierla
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