From: Brian Candler <b.candler@...>
Date: 2008-12-16T00:52:38+09:00
Subject: Re: ruby 1.9.1: Encoding trouble: broken US-ASCII String

>> Wouldn't it be kinder to default to BINARY if the encoding is
>> unspecified?
> 
> The default encoding is pulled from your environment:  LANG or
> LC_CTYPE, I believe.  This is very important and it makes simple
> scripting fit in well with the environment.

The code seems to say:
- if an encoding is chosen in the environment but is unknown to Ruby,
  use ASCII-8BIT (aka BINARY)
- if Ruby was built on a system where it doesn't know how to ask the
  environment for a language, then use US-ASCII

So I would read from this that the OP has either fallen foul of the 
US-ASCII fallback (e.g. no langinfo.h when building under Cygwin), or 
else his environment has explicitly picked US-ASCII.

There must have been a good reason why US-ASCII was chosen, rather than 
ASCII-8BIT, for systems without langinfo.h.

Regards,

Brian.

rb_locale_encoding(void)
{
    VALUE charmap = rb_locale_charmap(rb_cEncoding);
    int idx;

    if (NIL_P(charmap))
        idx = rb_usascii_encindex();
    else if ((idx = rb_enc_find_index(StringValueCStr(charmap))) < 0)
        idx = rb_ascii8bit_encindex();

    if (rb_enc_registered("locale") < 0) enc_alias("locale", idx);

    return rb_enc_from_index(idx);
}

...

VALUE
rb_locale_charmap(VALUE klass)
{
#if defined NO_LOCALE_CHARMAP
    return rb_usascii_str_new2("ASCII-8BIT");
#elif defined HAVE_LANGINFO_H
    char *codeset;
    codeset = nl_langinfo(CODESET);
    return rb_usascii_str_new2(codeset);
#elif defined _WIN32
    return rb_sprintf("CP%d", GetACP());
#else
    return Qnil;
#endif
}

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