From 00ac3a64ba57ecd8f10bf54f03297cdec0c538d6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 24 Aug 2023 18:32:46 +0900
Subject: Introduce `at_char_boundary` function

---
 io.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 6e27ed6273..bd1db9aa5d 100644
--- a/io.c
+++ b/io.c
@@ -4144,8 +4144,7 @@ rb_io_getline_0(VALUE rs, long limit, int chomp, rb_io_t *fptr)
                 s = RSTRING_PTR(str);
                 e = RSTRING_END(str);
                 p = e - rslen;
-                pp = rb_enc_left_char_head(s, p, e, enc);
-                if (pp != p) continue;
+                if (!at_char_boundary(s, p, e, enc)) continue;
                 if (!rspara) rscheck(rsptr, rslen, rs);
                 if (memcmp(p, rsptr, rslen) == 0) {
                     if (chomp) {
-- 
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