simple file system

[Chris Croughton]

I was under the impression that "b" was a DOS-only thing. But some reading
has put me right. ANSI X3.159-1989 (``ANSI C'') does define it, it's just
ignored on most Un*x's.

All Unices, as far as I am aware. The non-portable flag is "t" to force
text mode, it was introduced by (I think) Borland because they had
(have?) the ability to globally set the default mode so they wanted a
way to be able to force the mode both ways.

(The "b" flag is in the 99 standard as well, but not the "t" flag.)

Chris C