I haven't had time to check, but I suspect -1 is what it's giving.
I disagree with your reading of the standard though: -1 means failure,
and in a failure case there is not any specification about what went
into the buffer.
I agree with that ... but why is it failing? If the only reason it's
failing is because the buffer isn't big enough, that is wrong; it's
supposed to return the number of bytes it wanted to write. My reading
of the code we have now is that it's correctly rejecting the case where
snprintf() returns -1.
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