From: "jmthomas (Jason Thomas)" <jmthomas@...>
Date: 2012-03-21T22:37:47+09:00
Subject: [ruby-core:43530] [ruby-trunk - Bug #6179] File::pos broken in Windows 1.9.3p125


Issue #6179 has been updated by jmthomas (Jason Thomas).


This is an issue on 1.9.3p125 on Windows and doesn't just affect binary mode. Try the following program: 

# This example shows File#pos moving the file position with Ruby 1.9.3p125 on Windows

File.open("test.txt", "w") {|file| file.write("Jason says\nThat Ruby shouldn't\nbe broken\n")}

def test_read (call_pos)
  lines = ["Jason says\n", "That Ruby shouldn't\n", "be broken\n"]
  File.open("test.txt", "r") do |file|
    lines.each do |line|
      file.pos if call_pos # Moves file position on Ruby 1.9.3p125 on Windows
      read_line = file.readline
      puts read_line
      raise "Error!" if line != read_line
    end
  end
end

# Works
test_read(false)

puts

# Fails
test_read(true)

----------------------------------------
Bug #6179: File::pos broken in Windows 1.9.3p125
https://bugs.ruby-lang.org/issues/6179#change-25009

Author: jmthomas (Jason Thomas)
Status: Closed
Priority: Normal
Assignee: 
Category: core
Target version: 1.9.3
ruby -v: 1.9.3p125


Calling the pos method on a File in the Windows version of Ruby on 1.9.3p125 moves the file pointer. Thus it can not be called without side effect.


-- 
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