Using quill from C code

[anluoma]

Hi,

I am trying to figure out a nice way to use quill from C code that uses C++ API. Main intention is to replace old vprinft-based logging implementation with quill.

I added quill logger into c++ side and configured it it there and it starts and configures ok. But I was able to get it working only if pass only the ready formatted string (const *char) to C++ side losing the varargs.

So this works

// QLogger is just a wrapper for quill::logger
void LOGINFO_MSG(QLogger *qLogger, const char *formattedData)
{
   auto logger = qLogger->getLogger();
   // LOG_INFO does not seem to accept only const char*
   //LOG_INFO(logger, formattedData);

   // this does the trick though
   LOG_INFO(logger, "{}", formattedData);

}

and is can be used like this:

void Log(const char *fmt, ...) {
   va_list argptr;
   // just some test buffer from stack
   char buffer[1024];

   va_start(argptr, fmt);
   vsprintf_s(&buffer, sizeof(buffer), fmt, argptr);
   LOGINFO_MSG(StoredLoggerPtr, buffer);
   va_end(argptr);
}

What I would have wanted is to be able to expose the LOG_INFO api with varargs but was not able to figure out how to do this. I am no expert in varargs but I think I tried many things for this.

Any ideas how to do this?

-antti