From 7b260d9c2de4436d6e8b09ba4fd524782934153f Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.noreply.github.com>
Date: Sun, 14 Jul 2019 18:55:38 +0900
Subject: Improve `utf8len()` performance with UTF-8

---
 src/string.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/string.c b/src/string.c
index a6aa9d906..be623deda 100644
--- a/src/string.c
+++ b/src/string.c
@@ -233,7 +233,9 @@ utf8len(const char* p, const char* e)
   mrb_int len;
   mrb_int i;
 
+  if ((unsigned char)*p < 0x80) return 1;
   len = utf8len_codepage[(unsigned char)*p];
+  if (len == 1) return 1;
   if (len > e - p) return 1;
   for (i = 1; i < len; ++i)
     if ((p[i] & 0xc0) != 0x80)
-- 
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