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-rw-r--r--ext/stringio/stringio.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 23c4356f97..bd83ea207b 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -493,7 +493,18 @@ strio_set_lineno(VALUE self, VALUE lineno)
return lineno;
}
-#define strio_binmode strio_self
+static VALUE
+strio_binmode(VALUE self)
+{
+ struct StringIO *ptr = StringIO(self);
+ rb_encoding *enc = rb_ascii8bit_encoding();
+
+ ptr->enc = enc;
+ if (WRITABLE(self)) {
+ rb_enc_associate(ptr->string, enc);
+ }
+ return self;
+}
#define strio_fcntl strio_unimpl