From: Park Heesob <phasis68@...>
Date: 2005-11-06T00:28:44+09:00
Subject: Re: Problem in writing ruby extension.

Hi,

>From: Gyoung-Yoon Noh <nohmad@gmail.com>
>Reply-To: ruby-talk@ruby-lang.org
>To: ruby-talk@ruby-lang.org (ruby-talk ML)
>Subject: Problem in writing ruby extension.
>Date: Sat, 5 Nov 2005 20:56:29 +0900
>
>Hi,
>
>I am writing a ruby binding for C library implements an automaton
>for supporting non-english keyboard input. Following shows an example
>usage:
>
>   require 'hangul'
>
>   hic = Hangul::InputContext.new(Hangul::KEYBOARD_2)
>   input = "fnql gksrmf fkdlqmfjfl xptmxm"
>   buffer = ''
>   input.each_byte do |c|
>     ret = hic.filter(c)         # filtering [a-zA-Z] for automaton
>     commit = hic.commit_string  # output produced by automaton
>     buffer << commit if commit
>     buffer << c.chr unless ret  # just append unfiltered chars.
>   end
>   hic.flush
>   buffer << hic.commit_string.to_s
>
>It works as I expected when I paste the code on IRB, or run it with
>built-in ruby debugger(-r debug). See the actual session:
>
...
>
>FYI, the variable 'buffer' is finally utf-8 encoded string, expected
>result.
>
>But it returns strange result when I run the code directly from
>command-line. After running the code, the 'buffer' would be filled with
>only 3 spaces(0x20). The 'hic.commit_string' always returns nil. I don't
>know why the result differs. It doesn't relate with concurrency issues.
>
>My extension codes can be found at:
>http://nohmad.sub-port.net/tmp/ruby-hangul/
>
>Any comment will be appreciated.
>
>--
>http://nohmad.sub-port.net
>

The behaviour of wcstombs depends on the LC_CTYPE category of the  current 
locale.

Modify hangul.c like this:

#include "ruby.h"
#include "hangul.h"
#include <locale.h>                           // ADDED

static void
rbhic_free(HangulInputContext *hic)
{
    hangul_ic_delete(hic);
}

static VALUE
rbhic_alloc(VALUE klass)
{
    HangulInputContext *hic = hangul_ic_new(HANGUL_KEYBOARD_2);
    setlocale(LC_CTYPE,"ko_KR.eucKR");   // ADDED
    return Data_Wrap_Struct(klass, 0, rbhic_free, hic);
}
....

HTH,

Park Heesob