Bug #18769: StringIO#each hangs up on some input with `chomp: true`

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.0.3
• Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN

[andrykonchin (Andrew Konchin)]

The mentioned StringIO method #each (as well as #readlines and #each_line) may hang up when passed a separator and chomp: true:

require 'stringio'

StringIO.new('a||b||c').each("||", chomp: true) { |s| p s }

""
""
""
""
""
""
""

The same way behave other two methods:

StringIO.new('a||b||c').readlines("||", chomp: true)
StringIO.new('a||b||c').each_line("||", chomp: true) { |s| p s }

[jeremyevans0 (Jeremy Evans)]

I've submitted a pull request to fix this: https://github.com/ruby/stringio/pull/30

• Status changed from Open to Closed

Applied in changeset git|1f82269f4e1bf037e3e5504c6071b905f26fec6f.

---

[ruby/stringio] Fix each with multiple character string and chomp

Previously, this could result in an infinite loop. Always update
the e pointer in this case, setting w when chomping so the chomped
data is not included in the output.

Fixes [Bug #18769]

https://github.com/ruby/stringio/commit/4bf64d5130