getchar() question in 4.2

[Larry Philps]

[]
I have also been bothered by the change in the stdio "get"
interface.  In particular the code that was changed is
in filbuf.c where |_IOEOF was added to the if condition.

	if (iop->_flag&(_IOSTRG|_IOEOF))
		return(EOF);

This is a reasonable thing to do when reading from a real
file, but when the reads are from a tty, it is quite possible
to have multiple EOF's on the same stream (ex. learn, addbib, ...).

Can anyone think of any problems that would result from changing
the above to:

	if (iop->_flag&_IOSTRG)
		return(EOF);
	if ((iop->_flag&_IOEOF) && !isatty(fileno(iop)))
		return(EOF);

This would force the 4.1BSD protocol when reading from tty's
and the 4.2BSD protocol at all other times.  I have not tried
this myself, but think it should work without mucking up anything else.
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