How can csh detect EOF on stdin?

[Mike Khaw]

What's the csh equivalent of the /bin/sh:

	while :
	do
		read INPUT_LINE
		if test $? -ne 0; then break; fi	# EOF, exit loop

		# not EOF, process the line ...
	done

After "set input_line = $<", $status is always 0.  My system doesn't have
the line(1) program, so that's not an acceptable alternative.  Also note
that the input may contain blank (zero length) lines, so testing $input_line
== '' doesn't work right.

Thanks,
Mike Khaw
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