From cab687853a63198e5de9aa094d4ac01d068d0285 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Paolacci?= <sebastien.paolacci@gmail.com>
Date: Mon, 16 Dec 2013 19:11:17 +0100
Subject: [PATCH] Make BufferedReader propagate 0-byte long reads.

Could prevent callers from catching the situation and lead to e.g early
iterator terminations (cf. `Reader::read_byte') since `None' is only to
be returned only on EOF.
---
 src/libstd/io/buffered.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/libstd/io/buffered.rs b/src/libstd/io/buffered.rs
index 95c313dd282b..6350fabb018d 100644
--- a/src/libstd/io/buffered.rs
+++ b/src/libstd/io/buffered.rs
@@ -118,14 +118,14 @@ impl<R: Reader> Reader for BufferedReader<R> {
     fn read(&mut self, buf: &mut [u8]) -> Option<uint> {
         let nread = {
             let available = self.fill();
-            if available.len() == 0 {
-                return None;
-            }
             let nread = num::min(available.len(), buf.len());
             vec::bytes::copy_memory(buf, available.slice_to(nread));
             nread
         };
         self.pos += nread;
+        if nread == 0 && self.inner.eof() && buf.len() != 0 {
+                return None;
+        }
         Some(nread)
     }