io.c (swallow): support text mode and UTF-16/32 as internal encoding.
io.c (io_shift_cbuf): read and throw it away when str is NULL.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27768 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io.c (swallow): support text mode and UTF-16/32 as internal encoding.
io.c (io_shift_cbuf): read and throw it away when str is NULL.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27768 b2dd03c8-39d4-4d8f-98ff-823fe69b080e