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From: larry@uthub.UUCP (Larry Philps)
Newsgroups: net.unix-wizards
Subject: Re: getchar() question in 4.2
Message-ID: <148@uthub.UUCP>
Date: Wed, 2-May-84 15:14:09 EDT
Article-I.D.: uthub.148
Posted: Wed May  2 15:14:09 1984
Date-Received: Wed, 2-May-84 17:22:36 EDT
References: <12654@sri-arpa.UUCP> <468@asgb.UUCP>
Organization: CSRG, University of Toronto
Lines: 26

[]
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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