GNU bug report logs - #11309
24.1.50; Case problems with [:upper:] and Cyrillic, Greek

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Package: emacs;

Reported by: Aidan Kehoe <kehoea <at> parhasard.net>

Date: Sun, 22 Apr 2012 10:13:02 UTC

Severity: normal

Tags: patch

Found in version 24.1.50

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

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From: Mattias Engdegård <mattiase <at> acm.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Aidan Kehoe <kehoea <at> parhasard.net>
Cc: 11309 <at> debbugs.gnu.org
Subject: bug#11309: 24.1.50; Case problems with [:upper:] and Cyrillic,  Greek
Date: Mon, 7 Dec 2020 23:14:45 +0100

Not surprising in the least given the broken logic:

	  ((class_bits & BIT_UPPER) &&
	   (ISUPPER (c) || (corig != c &&
			    c == downcase (corig) && ISLOWER (c)))) ||
	  ((class_bits & BIT_LOWER) &&
	   (ISLOWER (c) || (corig != c &&
			    c == upcase (corig) && ISUPPER(c)))) ||

where corig is the character being matched and c is corig after canonicalising, which appears to mean downcasing in practice.
This means that the second case (BIT_LOWER means [:lower:]) works more or less as intended (by accident) but the [:upper:] case is less lucky and doesn't, as observed.

ASCII characters aren't affected by this bug since they are handled by a separate bitmap.

This has probably never worked properly.
This bug report was last modified 4 years and 223 days ago.

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