1 files changed, 37 insertions, 5 deletions
diff --git a/encoding.c b/encoding.c
index 93c3eca48c..ff62a3f083 100644
--- a/encoding.c
+++ b/encoding.c
@@ -43,8 +43,8 @@ enc_new(rb_encoding *encoding)
     return enc;
 }
 
-static VALUE
-enc_from_encoding(rb_encoding *enc)
+VALUE
+rb_enc_from_encoding(rb_encoding *enc)
 {
     return enc_initialized_p(enc) ? ENC_FROM_ENCODING(enc) : enc_new(enc);
 }
@@ -384,7 +384,7 @@ rb_obj_encoding(VALUE obj)
     if (!enc) {
 	rb_raise(rb_eTypeError, "unknown encoding");
     }
-    return enc_from_encoding(enc);
+    return rb_enc_from_encoding(enc);
 }
 
 
@@ -482,7 +482,7 @@ enc_list(VALUE klass)
     for (i = 0; i < enc_table_size; ++i) {
 	rb_encoding *enc = enc_table[i].enc;
 	if (enc) {
-	    rb_ary_push(ary, enc_from_encoding(enc));
+	    rb_ary_push(ary, rb_enc_from_encoding(enc));
 	}
     }
     return ary;
@@ -495,7 +495,7 @@ enc_find(VALUE klass, VALUE enc)
     if (idx < 0) {
 	rb_raise(rb_eArgError, "unknown encoding name - %s", RSTRING_PTR(enc));
     }
-    return enc_from_encoding(rb_enc_from_index(idx));
+    return rb_enc_from_encoding(rb_enc_from_index(idx));
 }
 
 /* :nodoc: */
@@ -513,6 +513,34 @@ enc_load(VALUE klass, VALUE str)
     return enc_find(klass, str);
 }
 
+static VALUE rb_primary_encoding;
+
+VALUE
+rb_get_primary_encoding(void)
+{
+    return rb_primary_encoding;
+}
+
+static VALUE
+get_primary_encoding(VALUE klass)
+{
+    return rb_get_primary_encoding();
+}
+
+void
+rb_set_primary_encoding(VALUE encoding)
+{
+    rb_to_encoding(encoding);
+    rb_primary_encoding = encoding;
+}
+
+static VALUE
+set_primary_encoding(VALUE klass, VALUE enc)
+{
+    rb_set_primary_encoding(enc);
+    return rb_primary_encoding;
+}
+
 void
 Init_Encoding(void)
 {
@@ -526,4 +554,8 @@ Init_Encoding(void)
 
     rb_define_method(rb_cEncoding, "_dump", enc_dump, -1);
     rb_define_singleton_method(rb_cEncoding, "_load", enc_load, 1);
+
+    rb_primary_encoding = rb_enc_from_encoding(rb_enc_from_index(0));
+    rb_define_singleton_method(rb_cEncoding, "primary_encoding", get_primary_encoding, 0);
+    rb_define_singleton_method(rb_cEncoding, "primary_encoding=", set_primary_encoding, 1);
 }