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From: Eric Wong <e@80x24.org>
To: yahns-public@yhbt.net
Subject: [PATCH] tee_input: simplify conditional for writing to temporary file
Date: Sat, 31 Dec 2016 04:39:49 +0000
Message-ID: <20161231043949.7301-1-e@80x24.org> (raw)

It's rare to have an empty string returned by `read` since it
requires a length argument of zero (careless) or nil (danger!
OOM!).  Lets not try to optimize away a method dispatch in this
case by checking .size (optimized instruction in YARV).

Ruby IO#write already treats writing an empty string as a noop,
so no syscall is saved.

n.b.  `gets` can return an empty string, too, but that's also
dangerous w.r.t. memory usage on untrusted input.
 lib/yahns/tee_input.rb | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/yahns/tee_input.rb b/lib/yahns/tee_input.rb
index 93ec148..90c8fd6 100644
--- a/lib/yahns/tee_input.rb
+++ b/lib/yahns/tee_input.rb
@@ -104,9 +104,7 @@ def consume!
   def tee(buffer)
-    if buffer && buffer.size > 0
-      @tmp.write(buffer)
-    end
+    @tmp.write(buffer) if buffer

                 reply	other threads:[~2016-12-31  4:39 UTC|newest]

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