From: "madeline-hou (Madeline Hou) via ruby-core" <ruby-core@...>
Date: 2023-11-13T19:08:00+00:00
Subject: [ruby-core:115366] [Ruby master Bug#7964] Writing an ASCII-8BIT String to a StringIO created from a UTF-8 String

Issue #7964 has been updated by madeline-hou (Madeline Hou).





@naruse (Yui NARUSE)



Like you said, the example comparisons aren't equal. I saw that the Feature #5677 that your linked to in your comment was rejected, would it be alright to close this issue?



----------------------------------------

Bug #7964: Writing an ASCII-8BIT String to a StringIO created from a UTF-8 String

https://bugs.ruby-lang.org/issues/7964#change-105295



* Author: brixen (Brian Shirai)

* Status: Assigned

* Priority: Normal

* Assignee: nobu (Nobuyoshi Nakada)

* ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin10.8.0]

----------------------------------------

=begin

In the following script, an ASCII-8BIT String is written to a StringIO created with a UTF-8 String without error. However, a << b or a + b will raise an exception, as will writing an ASCII-8BIT String to a File with UTF-8 external encoding.



+ $ cat file_enc.rb

  # encoding: utf-8

  require 'stringio'



  a = "On a very cold morning, it was -8�F."

  b = a.dup.force_encoding "ascii-8bit"



  io = StringIO.new a

  io.write(b)

  p io.string.encoding



  File.open "data.txt", "w:utf-8" do |f|

    f.write a

    f.write b

  end



+ $ ruby2.0 -v file_enc.rb

  ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin10.8.0]

  #<Encoding:UTF-8>

  file_enc.rb:13:in `write': "\xC2" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)

  	from file_enc.rb:13:in `block in <main>'

  	from file_enc.rb:11:in `open'

  	from file_enc.rb:11:in `<main>'



+ $ ruby1.9.3 -v file_enc.rb

  ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin10.8.0]

  #<Encoding:UTF-8>

  file_enc.rb:13:in `write': "\xC2" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)

  	from file_enc.rb:13:in `block in <main>'

  	from file_enc.rb:11:in `open'

  	from file_enc.rb:11:in `<main>'

=end









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