From: jonathan@hefner.pro
To: ruby-core@ruby-lang.org
Subject: [ruby-core:92520] [Ruby trunk Bug#15816] String#casecmp compares uppercase characters instead of lowercase
Date: Wed, 01 May 2019 22:27:40 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-15816.20190501222739.43c76b8b5c629442@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-15816.20190501222739@ruby-lang.org
Issue #15816 has been reported by jonathanhefner (Jonathan Hefner).
----------------------------------------
Bug #15816: String#casecmp compares uppercase characters instead of lowercase
https://bugs.ruby-lang.org/issues/15816
* Author: jonathanhefner (Jonathan Hefner)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v:
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
The current implementation of `String#casecmp` converts characters to uppercase before comparing them. However, all references I've found for `strcasecmp` (the C function on which `String#casecmp` is based) indicate characters should be converted to lowercase before being compared.
For example, [this man page](http://manpages.ubuntu.com/manpages/eoan/man3/strcasecmp.3.html) says:
> The POSIX.1-2008 standard says ... shall behave as if the strings had been converted to lowercase and then a byte comparison performed.
The difference in behavior is apparent when comparing / sorting strings containing `[`, `\`, `]`, `^`, `_`, or `` ` `` (the characters that occur between `Z` and `a`). Converting to lowercase sorts these punctuation characters before `A`-`z` along with most of the other punctuation in ASCII, but converting to uppercase sorts these characters after `A`-`z` instead.
--
https://bugs.ruby-lang.org/
next parent reply other threads:[~2019-05-01 22:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-15816.20190501222739@ruby-lang.org>
2019-05-01 22:27 ` jonathan [this message]
2019-05-09 3:38 ` [ruby-core:92602] [Ruby trunk Bug#15816] String#casecmp compares uppercase characters instead of lowercase merch-redmine
2019-05-09 7:35 ` [ruby-core:92610] " mame
2019-05-09 8:01 ` [ruby-core:92611] " nobu
2019-10-02 15:01 ` [ruby-core:95189] [Ruby master " merch-redmine
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