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Re: Checking for ASCII 7-bit Cleaness
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From: |
Hallvard B Furuseth |
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Subject: |
Re: Checking for ASCII 7-bit Cleaness |
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Date: |
Tue, 09 Jun 2009 20:53:33 +0200 |
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User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) |
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