Bug #19532: Handling of 6-byte codepoints in left_adjust_char_head in CESU-8 encoding is broken

• Status: Open
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: ruby 3.2.1 (2023-02-08 revision 31819e82c8) [x86_64-linux]
• Backport: 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED

[Eregon (Benoit Daloze)]

irb(main):001:0> "\u{10000}".encode("cesu-8").chop
=> "\xED\xA0\x80"

But it should be "".

Fix in https://github.com/ruby/ruby/pull/7510

[Eregon (Benoit Daloze)]

• Description updated (diff)

[Eregon (Benoit Daloze)]

• ruby -v set to ruby 3.2.1 (2023-02-08 revision 31819e82c8) [x86_64-linux]

[nobu (Nobuyoshi Nakada)]

The change itself looks fine, but also I’m for obsoleting CESU-8.