From 8a6344b64fe5f4fe7804305ffe72c1c64f0f367b Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 27 Dec 2022 16:10:46 +0900
Subject: [PATCH] mruby-io/io.c (mrb_io_readchar): avoid redundant call to
 mrb_utf8len()

---
 mrbgems/mruby-io/src/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 0d0c7b300..86e8bcead 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -1524,8 +1524,8 @@ mrb_io_readchar(mrb_state *mrb, mrb_value self)
       n = read(fptr->fd, RSTRING_PTR(buf)+blen, 4096-blen);
       if (n < 0) mrb_sys_fail(mrb, "sysread failed");
       mrb_str_resize(mrb, buf, blen+n);
+      len = mrb_utf8len(RSTRING_PTR(buf), RSTRING_END(buf));
     }
-    len = mrb_utf8len(RSTRING_PTR(buf), RSTRING_END(buf));
   }
 #endif
   return io_bufread(mrb, buf, len);