[ruby-dev:32872] Re: Windowでのデフォルトエンコーディング

In article <[e-mail]>,
  "U.Nakamura" <[e-mail]> writes:

> +	rb_enc_associate(result, ifp->enc ? ifp->enc : (ifp->mode & FMODE_BINMODE) ? rb_ascii8bit_encoding() : rb_default_external_encoding());

今調べたところ、readline は locale に従って動きます。
ていうか setlocale を呼びます。

% gdb ruby-1.8
GNU gdb 6.4.90-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".

(gdb) break setlocale
Function "setlocale" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (setlocale) pending.
(gdb) run -rreadline -e 'Readline.readline("> ")'       
Starting program: /home/akr/bin/ruby-1.8 -rreadline -e 'Readline.readline("> ")'
Failed to read a valid object file image from memory.
Breakpoint 2 at 0xb7df4fd6
Pending breakpoint "setlocale" resolved

Breakpoint 2, 0xb7df4fd6 in setlocale () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0  0xb7df4fd6 in setlocale () from /lib/tls/i686/cmov/libc.so.6
#1  0xb7d8a741 in _rl_init_eightbit () from /lib/libreadline.so.5
#2  0xb7d731e3 in rl_initialize () from /lib/libreadline.so.5
#3  0xb7d740b2 in readline () from /lib/libreadline.so.5
#4  0x08057239 in rb_protect (proc=0xb7d74080 <readline>, data=135476472, state=0xbfe27940) at eval.c:5471
#5  0xb7f6a149 in readline_readline (argc=1, argv=0xbfe27bb0, self=3084663620) at readline.c:83
#6  0x080557de in call_cfunc (func=0xb7f6a030 <readline_readline>, recv=3084663620, len=-1210511455, argc=dwarf2_read_address: Corrupted DWARF expression.
) at eval.c:5701
#7  0x0805e272 in rb_call0 (klass=<value optimized out>, recv=3084663620, id=7441, oid=7441, argc=135477768, 
    argv=0xbfe27bb0, body=0xb7dc3af4, flags=<value optimized out>) at eval.c:5857
#8  0x0805ef51 in rb_call (klass=3084663560, recv=3084663620, mid=7441, argc=1, argv=0xbfe27bb0, scope=0, self=3084728740)
    at eval.c:6104
#9  0x0805c73a in rb_eval (self=3084728740, n=<value optimized out>) at eval.c:3482
#10 0x08069c9e in ruby_exec_internal () at eval.c:1640
#11 0x08069cd6 in ruby_exec () at eval.c:1660
#12 0x08069d01 in ruby_run () at eval.c:1670
#13 0x080528bf in main (argc=1196310860, argv=0x534f5000, envp=0x28005849) at main.c:48

なので、readline が生成する文字列は default external encoding ではなく、
locale encoding にするのが適切ではないでしょうか。
-- 
[田中 哲][たなか あきら][Tanaka Akira]