reply() used to play a lot with stdout, expecially fflush(stdout).

The recent change is to avoid stdio.  That's good, except there are
nearly 130 calls to this function, yet what if one of them depended on
fflush() or something else in this code?  The semantic change was
never checked.  That is not how we do development -- back this out
until we know that checking work has been done.

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