From: Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
To: help-gnu-emacs@gnu.org
Subject: Re: Checking for ASCII 7-bit Cleaness
Date: Tue, 09 Jun 2009 20:53:33 +0200 [thread overview]
Message-ID: <hbf.20090609nhtr@bombur.uio.no> (raw)
In-Reply-To: bf3e45af-71fb-4ec2-bba2-76d8fa0ce487@21g2000vbk.googlegroups.com
Nordlöw writes:
> In C I would have stepped forward 4 bytes (except for the resting 1-3
> bytes of the file of course) and for each such block x then tested
> that (x & 0x80808080) equals zero. If so the file is 7-bit clean.
> Could we do something similar with elisp regular expression
> operations?
Don't think so. That's a C internals trick, abusing how integers and
bytes are represented.
(defun buffer-ascii-clean-p ()
(save-excursion
(goto-char (point-min))
(skip-chars-forward "[\0-\177]")
(eobp)))
--
Hallvard
prev parent reply other threads:[~2009-06-09 18:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-09 18:44 Checking for ASCII 7-bit Cleaness Nordlöw
2009-06-09 18:50 ` Nordlöw
2009-06-09 18:53 ` Hallvard B Furuseth [this message]
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