io.c (io_readpartial): Document the output buffer parameter is
overwritten with the read contents even when non-empty.
Patch by yu nobuoka. [ruby-trunk - Bug #6285]
io.c (io_read_nonblock): ditto.
io.c (io_read): ditto.
io.c (rb_io_sysread): ditto.
io.c (argf_read): ditto.
io.c (argf_readpartial): ditto.
ext/stringio/stringio.c (strio_read): ditto.
test/ruby/test_argf.rb (class TestArgf): Add test for existing
behavior of read outbuf.
overwritten with the read contents even when non-empty.
Patch by yu nobuoka. [ruby-trunk - Bug #6285]
behavior of read outbuf.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e