io.c: fix 7bit coderange condition

* io.c (io_getc): fix 7bit coderange condition, check if ascii read
  data instead of read length. [ruby-core:55444] [Bug #8516]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 1 deletions

diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index ac3b8eaa1e..dee36abaaf 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -2196,7 +2196,17 @@ EOT
       open("a", "wb") {|f| f.puts "a"}
       open("a", "rt") {|f| f.getc}
     }
-    assert(c.ascii_only?, "should be ascii_only #{bug4557}")
+    assert_predicate(c, :ascii_only?, bug4557)
+  end
+
+  def test_getc_conversion
+    bug8516 = '[ruby-core:55444] [Bug #8516]'
+    c = with_tmpdir {
+      open("a", "wb") {|f| f.putc "\xe1"}
+      open("a", "r:iso-8859-1:utf-8") {|f| f.getc}
+    }
+    assert_not_predicate(c, :ascii_only?, bug8516)
+    assert_equal(1, c.size, bug8516)
   end
 
   def test_default_mode_on_dosish