From: Ian MacLeod <ian@...>
Date: 2011-07-01T06:15:26+09:00
Subject: [ruby-core:37699] [Ruby 1.9 - Bug #4952][Open] Integer#chr(Encoding::*) behaves inconsistently with negative or large values


Issue #4952 has been reported by Ian MacLeod.

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Bug #4952: Integer#chr(Encoding::*) behaves inconsistently with negative or large values
http://redmine.ruby-lang.org/issues/4952

Author: Ian MacLeod
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.4]


These seem like they should all be raising RangeError; and appear to indicate that values are overflowing/being cast improperly:

    ruby-1.9.2-p180 :001 > -1.chr(Encoding::UTF_8)
     => "\xFF" 
    ruby-1.9.2-p180 :002 > -2.chr(Encoding::UTF_8)
     => "\xFE" 
    ruby-1.9.2-p180 :006 > -1.chr(Encoding::UTF_16LE)
     => "\uD7BF\xFF\xDF" 
    ruby-1.9.2-p180 :007 > -2.chr(Encoding::UTF_16LE)
     => "\uD7BF\xFE\xDF" 
    ruby-1.9.2-p180 :008 > -1234.chr(Encoding::UTF_16LE)
     => "\uD7BE\x2E\xDF"
    ruby-1.9.2-p180 :009 > -1.chr(Encoding::EUC_JP)
    ArgumentError: invalid codepoint 0xffffffff in EUC-JP

Examples that are inconsistent:

    ruby-1.9.2-p180 :005 > -1.chr(Encoding::WINDOWS_1251)
    RangeError: 4294967295 out of char range

Examples that seem to be fine:

    ruby-1.9.2-p180 :003 > -3.chr(Encoding::UTF_8)
    RangeError: -3 out of char range



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