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date: Thu, 24 Jul 2025 13:59:39 GMT
Bug #21517: Behaviour of StringIO#readpartial with multibyte differs from IO#readpartial - Ruby - Ruby Issue Tracking System
[ruby-core:122817]
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Bug #21517
open
Behaviour of StringIO#readpartial with multibyte differs from IO#readpartial
Added by herwin (Herwin W) 6 days ago.
Status:
Open
Assignee:
-
Target version:
-
ruby -v:
ruby 3.4.5 (2025-07-16 revision 20cda200d3) +PRISM [x86_64-linux] (+ others)
Description
The specs for IO#readpartial have the following test (https://github.com/ruby/spec/blob/ed254bae321221f5cd24280beb37e5bddaff6bb6/core/io/readpartial_spec.rb#L41-L47):
before :each do
@rd, @wr = IO.pipe
@rd.binmode
@wr.binmode
end
it "reads after ungetc with multibyte characters in the buffer" do
@wr.write("∂φ/∂x = gaîté")
c = @rd.getc
@rd.ungetc(c)
@rd.readpartial(3).should == "\xE2\x88\x82"
@rd.readpartial(3).should == "\xCF\x86/"
end
This behaviour is different in StringIO#readpartial. If I add this as a spec:
it "reads after ungetc with multibyte characters in the buffer" do
@string = StringIO.new(+"∂φ/∂x = gaîté")
c = @string.getc
@string.ungetc(c)
@string.readpartial(3).should == "\xE2\x88\x82"
@string.readpartial(3).should == "\xCF\x86/"
end
it fails with every supported Ruby version, and even with 3.5-dev of today, with the message Expected "\xE2\x88\x82" == "∂"
The getc + ungetc can be removed, but this does not change the behaviour.
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