From: KUBO Takehiro <kubo@...>
Date: 2009-04-04T19:32:31+09:00
Subject: Re: Problem with String encoding when modifying it in C method

Hi,

On Sat, Apr 4, 2009 at 1:39 AM, Iņaki Baz Castillo <ibc@aliax.net> wrote:
> Hi, I've added a method "multi_capitalize" to String class. This
> method is done in C and basically modifies the string:
>
>  "record-roUTE".multi_capitalize => "Record-Route"
>
> The problem is that after the method execution, the new String has
> ASCII-8BIT encoding, while the original string had UTF-8 (using Ruby
> 1.9.1).

    rb_encoding *enc = rb_enc_get(original_string)

    /* create a new string with the encoding same with the original string */
    return rb_enc_str_new(char_pointer, length, enc);

rb_str_new() makes a ASCII-8BIT string.