Add $true and $false.

[sobomax]

Summary

This change adds $true and $false constants.

Details

Most of the real modern programming languages have special value for boolean "true" and "false" values. Those are useful for initializations (i.e. $var(foo) = $true), also to use as an argument to a function. In addition, it can be used to forcefully disable / enable code block in pre-processing and/or debugging.

For what's worth, the ChatGPT thinks those already exist:

You
what is the simplest expression that always evaluates to false in opensips?

ChatGPT
The simplest expression that always evaluates to false in OpenSIPS is $false. You can use it in an if statement like so:

if ($false) {
  # This block will never execute
}

Solution

$true and $false values have been added into core variables.

Compatibility

None expected.

[sobomax]

P.S. I pushed some cleanup making variable name really const (and propagated str_const_init()) while I am here.

[liviuchircu]

Hey, @sobomax!

Could you detail which problem you trying to solve using these new $true and $false variables that the built-in true (1) and false (0) opensips.cfg constants cannot solve?

[sobomax]

@liviuchircu sorry did not realize true / false exist. Searching the code did not bring any clues. Thanks!