From cf6d41b51d707452d3f2d193d3cf7d9767a15fce Mon Sep 17 00:00:00 2001
From: Dmitry Atamanov <data-man@users.noreply.github.com>
Date: Fri, 6 Apr 2018 11:09:05 +0300
Subject: [PATCH] Fixes #5281 (#7489)

---
 lib/pure/streams.nim    |  2 ++
 tests/osproc/tstdin.nim | 11 +++++------
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/lib/pure/streams.nim b/lib/pure/streams.nim
index 025a534c5f..8fb14b6f6b 100644
--- a/lib/pure/streams.nim
+++ b/lib/pure/streams.nim
@@ -321,6 +321,8 @@ proc readLine*(s: Stream): TaintedString =
   ## Reads a line from a stream `s`. Note: This is not very efficient. Raises
   ## `EIO` if an error occurred.
   result = TaintedString""
+  if s.atEnd:
+    raise newEIO("cannot read from stream")
   while true:
     var c = readChar(s)
     if c == '\c':
diff --git a/tests/osproc/tstdin.nim b/tests/osproc/tstdin.nim
index d94c34192d..9b49ed7862 100644
--- a/tests/osproc/tstdin.nim
+++ b/tests/osproc/tstdin.nim
@@ -11,9 +11,8 @@ doAssert fileExists(getCurrentDir() / "tests" / "osproc" / filename)
 var p = startProcess(filename, getCurrentDir() / "tests" / "osproc")
 p.inputStream.write("5\n")
 p.inputStream.flush()
-while true:
-  let line = p.outputStream.readLine()
-  if line != "":
-    echo line
-  else:
-    break
+
+var line = ""
+
+while p.outputStream.readLine(line.TaintedString):
+  echo line