From 2d0db8e591513a1123057b8c330c946ddcb4fbc8 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 5 Nov 2014 22:50:24 -0500
Subject: bufio: fix reading of many blank lines in a row

Fixes #9020.

LGTM=bradfitz, r
R=r, bradfitz
CC=golang-codereviews
https://golang.org/cl/170030043
---
 src/bufio/scan_test.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/bufio/scan_test.go')

diff --git a/src/bufio/scan_test.go b/src/bufio/scan_test.go
index a1cf90ddbf..bf888dafb5 100644
--- a/src/bufio/scan_test.go
+++ b/src/bufio/scan_test.go
@@ -489,6 +489,18 @@ func TestDontLoopForever(t *testing.T) {
 	}
 }
 
+func TestBlankLines(t *testing.T) {
+	s := NewScanner(strings.NewReader(strings.Repeat("\n", 1000)))
+	for count := 0; s.Scan(); count++ {
+		if count > 2000 {
+			t.Fatal("looping")
+		}
+	}
+	if s.Err() != nil {
+		t.Fatal("after scan:", s.Err())
+	}
+}
+
 type countdown int
 
 func (c *countdown) split(data []byte, atEOF bool) (advance int, token []byte, err error) {
-- 
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