From 4c255c77399789324e5c4d72787d87ac1fcc49dd Mon Sep 17 00:00:00 2001
From: Vladimir Dementyev <dementiev.vm@gmail.com>
Date: Thu, 5 Oct 2017 14:40:43 +0300
Subject: Handle shared/frozen strings in IO#sysread

See https://github.com/mruby/mruby/commit/7edbe428caca6814841195a3f2720745cf04353e
---
 src/io.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/io.c b/src/io.c
index 992801a62..6f52daf4a 100644
--- a/src/io.c
+++ b/src/io.c
@@ -630,8 +630,13 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io)
   if (mrb_nil_p(buf)) {
     buf = mrb_str_new(mrb, NULL, maxlen);
   }
+
+  mrb_str_modify(mrb, RSTRING(buf));
+
   if (RSTRING_LEN(buf) != maxlen) {
     buf = mrb_str_resize(mrb, buf, maxlen);
+  } else {
+    mrb_str_modify(mrb, RSTRING(buf));
   }
 
   fptr = (struct mrb_io *)io_get_open_fptr(mrb, io);
-- 
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