From: Xavier Noria <fxn@...>
Date: 2006-08-01T01:39:57+09:00
Subject: Re: Does Ruby need a "line separator" class?

On Jul 31, 2006, at 6:15 PM, Charles O Nutter wrote:

> This has come up in the JRuby project fairly frequently since Java  
> wants to
> normalize line-terminators internally to the underlying platform,  
> rather
> than normalizing to \n and handling conversion on read-write.  
> Xavier, are
> you saying that Ruby has in its IO layer code to convert from CRLF  
> to LF on
> input/output, and this is the primary means of normalizing  
> newlines? We have
> had in our bug tracker a patch that resolves JRuby's newline issues  
> in a
> similar way, but had not committed it pending research into whether  
> this
> would be appropriate and sufficient.

If I am not mistaken, in Ruby that is delegated to stdio. After a  
quick code inspection I think the exact point where that is done is  
in the call to write():

   r = write(fileno(f), RSTRING(str)->ptr+offset, l);

That's in the function io_fwrite(), line 455 of io.c in Ruby 1.8.4.

In Perl that was delegated to stdio as well until 5.8.0, where the I/ 
O layer was substituted with PerlIO who is now the responsible for  
that filtering in CRLF platforms.

-- fxn