From d27ee2112ff81d4d445a2a9bd6df538aca16f1fd Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 11 Mar 2019 06:45:29 +0000
Subject: merge revision(s) 67188: [Backport #15642]

	io.c: chomp CR at the end of read buffer

	* io.c (rb_io_getline_fast): chomp CR followed by LF but separated
	  by the read buffer boundary.  [ruby-core:91707] [Bug #15642]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67207 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 7de405de32..07c678f855 100644
--- a/io.c
+++ b/io.c
@@ -3306,6 +3306,12 @@ rb_io_getline_fast(rb_io_t *fptr, rb_encoding *enc, int chomp)
 		read_buffered_data(RSTRING_PTR(str)+len, pending - chomplen, fptr);
 		fptr->rbuf.off += chomplen;
 		fptr->rbuf.len -= chomplen;
+                if (pending == 1 && chomplen == 1 && len > 0) {
+                    if (RSTRING_PTR(str)[len-1] == '\r') {
+                        rb_str_resize(str, --len);
+                        break;
+                    }
+                }
 	    }
 	    len += pending - chomplen;
 	    if (cr != ENC_CODERANGE_BROKEN)
-- 
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