From: "jmthomas (Jason Thomas)" <redmine@...>
Date: 2012-11-02T00:05:50+09:00
Subject: [ruby-core:48709] [ruby-trunk - Bug #6401] Windows bug with File.pos


Issue #6401 has been updated by jmthomas (Jason Thomas).


I can confirm this bug has been fixed in Ruby 1.9.3-p286. Thanks!
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Bug #6401: Windows bug with File.pos
https://bugs.ruby-lang.org/issues/6401#change-32170

Author: jmthomas (Jason Thomas)
Status: Closed
Priority: Normal
Assignee: h.shirosaki (Hiroshi Shirosaki)
Category: core
Target version: 1.9.3
ruby -v: ruby 1.9.3p194 (2012-04-20) [i386-mingw32]


On Windows since Ruby 1.9.3p125 there have been issues with File.pos and File.readline. Ruby 1.9.3p0 does not have this issue. I have created the following test:

  def test_pos_with_readline
    t = make_tempfile
    random = Random.new(1234)
    open(t.path, "w") do |f|
      500.times do
        f.puts "X"*random.rand(80)
      end
    end
    i = 0
    lines = open(t.path,'r').read.split("\n")
    open(t.path, "r") do |f|
      lines.length.times do
        f.pos
        assert_equal lines[i], f.readline.chomp
        i += 1
      end
    end
  end

If you comment out the f.pos line this test case will pass. I originally submitted issue #6179 but the fixes applied there made things better but did not complete solve the problem. I apologize for the test case but it requires many lines with newlines to reproduce.


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