matz	2007-12-24 00:56:41 +0900 (Mon, 24 Dec 2007)

  New Revision: 14531

  Modified files:
    trunk/ChangeLog
    trunk/io.c
    trunk/version.h

  Log:
    * io.c (rb_io_s_read): encoding argument reverted.
    
    * io.c (mode_enc): independent function to share code.
    
    * io.c (rb_io_internal_encoding): new method.

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/version.h?r1=14531&r2=14530
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=14531&r2=14530
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/io.c?r1=14531&r2=14530