From 2b5ba96a3995d488eb9180c7aea7b146ce7925e4 Mon Sep 17 00:00:00 2001
From: Anton Leherbauer <anton.leherbauer@windriver.com>
Date: Fri, 16 Oct 2009 09:16:51 +0000
Subject: [PATCH] Minor performance optimization in SpawnerInputStream

---
 .../org/eclipse/cdt/utils/spawner/SpawnerInputStream.java   | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/spawner/SpawnerInputStream.java b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/spawner/SpawnerInputStream.java
index 3af47015351..408b50cd6bc 100644
--- a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/spawner/SpawnerInputStream.java
+++ b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/spawner/SpawnerInputStream.java
@@ -61,13 +61,15 @@ class SpawnerInputStream extends InputStream {
 		} else if (len == 0) {
 			return 0;
 		}
-		byte[] tmpBuf = new byte[len];
+		byte[] tmpBuf = off > 0 ? new byte[len - off] : buf;
 
 		len = read0(fd, tmpBuf, len);
 		if (len <= 0)
 			return -1;
 
-		System.arraycopy(tmpBuf, 0, buf, off, len);
+		if (tmpBuf != buf) {
+			System.arraycopy(tmpBuf, 0, buf, off, len);
+		}
 		return len;
 	}