I wrote:
> So the question for us is whether it's worth trying to make pgreadlink
> conform to the letter of the POSIX spec in this detail. TBH, I can't
> get excited about that, at least not so far as zic's usage is concerned.
Hmmm ... on closer inspection, though, it might not be that hard.
pgreadlink is already using a fixed-length buffer (with only enough
room for MAX_PATH WCHARs) for the input of WideCharToMultiByte. So
it could use a fixed-length buffer of say 4 * MAX_PATH bytes for the
output, and then transfer just the appropriate amount of data to the
caller's buffer.
regards, tom lane