[ some experimenting later ... ] What it appears to be doing is filling
the buffer to the specified length and then returning -1 anyway. Given
your argument that there is no reason for it to fail, I suppose the
quickest hack is to assume that -1 means the same as "buffer filled".
Be careful, my point wasn't that it wasn't supposed to fail, my point
was that returning -1 means "error". I don't see how we can portably
assume -1 means "buffer filled".
I think I'm with Paul Vixie on this one; it's not unreasonable in this
day and age to require a POSIX C library.
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