Enhance NRF LOG to include line number in prefix

[Andy]

Hello,

I want to modify the NRF logging module to include the line number where the log was originated.

In the past I created a wrapper macro that called NRF_LOG_INFO twice, once with the desired prefix and one with the actual string I wanted to print. I also had to remove the new line characters from the logging module so that the two calls were printed in the same line. I don't want to do this wrapper stuff anymore and would like to modify the logging module instead.

What would be the best way to do this? I'm currently using SDK 15.2.

[awneil]

Andy said:

What would be the best way to do this?

Examine the source of the existing logging functions, and modify to suit.

Only the string formatting should be affected - not the transmission functions.

You will probably need to understand how variadic functions work in 'C' ...

https://en.cppreference.com/w/c/variadic

[Andy]

I know I have to modify the source... I'm asking for some hints about what to modify. The logging module is kind of like a cascade of macros. One after another after another.

[Andy]

And I think I'd have to modify starting from the macros, inserting __LINE__ somewhere.

If I add __LINE__ somewhere in the string formatter module it will print the line in that source file, not the line where the NRF_LOG_INFO macro was initially called from.

[awneil]

Yes, I would say you'd have to pass __LINE__ as parameter, and have your formatter put that into the string...

Something like this:

https://stackoverflow.com/a/15885297/4618900

EDIT

Fix link

[Andy]

Yeah, that's basically what I want to do, but it's not trivial as far as I can tell.

[Andy]

At least not without creating a wrapper macro that calls NRF_LOG_INFO twice, which is what I already did.