From: Xavier Leroy <xavier.leroy@inria.fr>
To: Oleg <oleg_inconnu@myrealbox.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] undo_input_line
Date: Fri, 9 Aug 2002 14:45:33 +0200 [thread overview]
Message-ID: <20020809144533.A29080@pauillac.inria.fr> (raw)
In-Reply-To: <200208080713.DAA00472@dewberry.cc.columbia.edu>; from oleg_inconnu@myrealbox.com on Thu, Aug 08, 2002 at 03:14:08AM -0400
> Does `let s = input_line ic` always increment `pos_in ic` by
> `String.length s + 1` ?
Only if "ic" is in binary mode. In text mode, conversions may happen
during reading (e.g. under Windows, removal of the final \r) that
invalidate this claim.
> So, if I define a function
> let undo_input_line ic s =
> seek_in ic (pos_in ic - String.length s - 1);;
> will it always work as expected, or will this depend on I/O mode (binary vs
> text) and file format (DOS vs UNIX)?
To "undo" an input, I'd recommend doing "let p = pos_in ic" before the read,
performing the read, and doing "seek_in ic p" to undo the read.
This will be a lot more robust.
- Xavier Leroy
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prev parent reply other threads:[~2002-08-09 12:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 7:14 Oleg
2002-08-09 12:45 ` Xavier Leroy [this message]
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