From: Brian Candler <b.candler@...>
Date: 2008-11-08T07:10:39+09:00
Subject: Re: irb and ruby giving different results

Nit Khair wrote:
> I still get 95.

Possibly readline isn't calling setlocale until you actually 
invoke/initialise the library.

Here's an alternative test. Install the RubyInline gem, and then stick 
this in front of your test program:

require 'rubygems'
require 'inline'

class MyTest

  inline do |builder|
    builder.include '<locale.h>'
    builder.c "
    void set_locale(void) {
       setlocale(LC_ALL, 0);
    }"

  end
end

MyTest.new.set_locale

If that works, you can remove the dependency on the LC_ALL environment 
variable by changing to: setlocale(LC_ALL, "en_US.UTF-8"); or whatever.

However, this dependence on the C stdlib's half-baked idea of "locale" 
is very hairy. I understand why Ruby doesn't call setlocale() normally - 
it means that at least the normal behaviour is (a) sane, and (b) not 
affected randomly by global environment variable settings.

To be honest, if you want a character class which always matches 0x20 to 
0x7e and 0xa0 to 0xff, then you might as well just say so directly:

    [\x20-\x7e\xa0-\xff]
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