* io.c (rb_io_eof): use eof() instead of io_fillbuf(). It's because

  io_unread() doesn't work properly when reading CRLF with read(length)
  and mode 'r'.
  [ruby-core:44189][Bug #6271]

* test/ruby/test_io_m17n.rb (TestIO_M17N#test_read_crlf_and_eof):
  test for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35296 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 0 deletions

diff --git a/io.c b/io.c
index ca7f1b2e92..f0c851519f 100644
--- a/io.c
+++ b/io.c
@@ -1614,6 +1614,11 @@ rb_io_eof(VALUE io)
     if (READ_CHAR_PENDING(fptr)) return Qfalse;
     if (READ_DATA_PENDING(fptr)) return Qfalse;
     READ_CHECK(fptr);
+#if defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32)
+    if (!NEED_READCONV(fptr) && NEED_NEWLINE_DECORATOR_ON_READ(fptr)) {
+	return eof(fptr->fd) ? Qtrue : Qfalse;
+    }
+#endif
     if (io_fillbuf(fptr) < 0) {
 	return Qtrue;
     }