> A robust solution which also reduces syscalls does not necessarily
> require a precise answer here.
> I suggest writing a wrapper function which has on the stack
> and calls LookupAccountNameA() passing sidbuf as Sid.
> If it succeeds, then malloc() returned cbSid value and copy sidbuf[].
> If it fails because the buffer is too small, then malloc() the returned
> cbSid value and call LookupAccountNameA() again.
> Doing the above will keep memory use to a minimum, and will generally
> call LookupAccountNameA() once per wrapper func invocation rather than
> twice.

+1 !

Anton Lavrentiev
Contractor NIH/NLM/NCBI

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