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_5@67191 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/io.c b/io.c
index 94facda8e7..1d190331d6 100644
--- a/io.c
+++ b/io.c
@@ -3241,6 +3241,12 @@ 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)