https://git.ruby-lang.org/ruby.git/commit/?id=9988f6ac4e

From 9988f6ac4e887437b5a76f0a1c27fa6f5c17c039 Mon Sep 17 00:00:00 2001
From: Sutou Kouhei <kou@c...>
Date: Thu, 20 May 2021 06:29:26 +0900
Subject: [ruby/fiddle] Add Fiddle::MemoryView#to_s
 (https://github.com/ruby/fiddle/pull/78)

Fix https://github.com/ruby/fiddle/pull/74

Reported by dsisnero. Thanks!!!
---
 ext/fiddle/memory_view.c        | 32 ++++++++++++++++++++++++++++++++
 test/fiddle/test_memory_view.rb | 10 ++++++++++
 2 files changed, 42 insertions(+)

diff --git a/ext/fiddle/memory_view.c b/ext/fiddle/memory_view.c
index 172b1f1..2a9f45f 100644
--- a/ext/fiddle/memory_view.c
+++ b/ext/fiddle/memory_view.c
@@ -1,5 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/ext/fiddle/memory_view.c#L1
 #include <stdbool.h>
 #include <ruby/ruby.h>
+#include <ruby/encoding.h>
 
 #ifdef HAVE_RUBY_MEMORY_VIEW_H
 # include <ruby/memory_view.h>
@@ -233,6 +234,36 @@ rb_fiddle_memview_aref(int argc, VALUE *argv, VALUE obj) https://github.com/ruby/ruby/blob/trunk/ext/fiddle/memory_view.c#L234
     return rb_memory_view_extract_item_members(ptr, data->members, data->n_members);
 }
 
+static VALUE
+rb_fiddle_memview_to_s(VALUE self)
+{
+    struct memview_data *data;
+    const char *raw_data;
+    long byte_size;
+    VALUE string;
+
+    TypedData_Get_Struct(self,
+                         struct memview_data,
+                         &fiddle_memview_data_type,
+                         data);
+
+    if (NIL_P(data->view.obj)) {
+        raw_data = NULL;
+        byte_size = 0;
+    } else {
+        raw_data = data->view.data;
+        byte_size = data->view.byte_size;
+    }
+
+    string = rb_enc_str_new_static(raw_data, byte_size, rb_ascii8bit_encoding());
+    {
+        ID id_memory_view;
+        CONST_ID(id_memory_view, "memory_view");
+        rb_ivar_set(string, id_memory_view, self);
+    }
+    return rb_obj_freeze(string);
+}
+
 void
 Init_fiddle_memory_view(void)
 {
@@ -249,6 +280,7 @@ Init_fiddle_memory_view(void) https://github.com/ruby/ruby/blob/trunk/ext/fiddle/memory_view.c#L280
     rb_define_method(rb_cMemoryView, "strides", rb_fiddle_memview_get_strides, 0);
     rb_define_method(rb_cMemoryView, "sub_offsets", rb_fiddle_memview_get_sub_offsets, 0);
     rb_define_method(rb_cMemoryView, "[]", rb_fiddle_memview_aref, -1);
+    rb_define_method(rb_cMemoryView, "to_s", rb_fiddle_memview_to_s, 0);
 }
 
 #endif /* FIDDLE_MEMORY_VIEW */
diff --git a/test/fiddle/test_memory_view.rb b/test/fiddle/test_memory_view.rb
index ffea8a9..6777a04 100644
--- a/test/fiddle/test_memory_view.rb
+++ b/test/fiddle/test_memory_view.rb
@@ -113,5 +113,15 @@ module Fiddle https://github.com/ruby/ruby/blob/trunk/test/fiddle/test_memory_view.rb#L113
       assert_equal([-1, -2], mview[1, 0])
       assert_equal([-7, -8], mview[1, 3])
     end
+
+    def test_to_s
+      # U+3042 HIRAGANA LETTER A
+      data = "\u{3042}"
+      ptr = Pointer[data]
+      mview = MemoryView.new(ptr)
+      string = mview.to_s
+      assert_equal([data.b, true],
+                   [string, string.frozen?])
+    end
   end
 end
-- 
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