From: Florian Frank <flori@...>
Date: 2004-10-05T23:35:19+09:00
Subject: 

Hello,

The latest changes in io.c (ruby 1.8) are quite a disaster. I have put
an  rb_warn(mode) at the beginning of rb_fopen and strange things
are happening.

w+ doesn't work any more, it should create a file if it doesn't already 
exist:

(flori@closure:flori/ 1)$ ruby -e 'File.new("foo", "w+")'
-e:1: warning: r+
-e:1:in `initialize': No such file or directory - foo (Errno::ENOENT)
         from -e:1:in `new'
         from -e:1

Appending doesn't work either:

(flori@closure:flori/ 0)$ ruby -e 'File.new("foo", "a").puts "bla"'
-e:1: warning: w
(flori@closure:flori/ 0)$ ruby -e 'File.new("foo", "a").puts "blu"'
-e:1: warning: w
(flori@closure:flori/ 0)$ cat foo
blu

In rb_file_open_internal rb_io_mode_flags and rb_io_flags_mode are
called and this leads to the loss of important mode information.

Florian Frank