From e7e55d0cc950f5d7645c9b59ada9632d83e94f65 Mon Sep 17 00:00:00 2001
From: Nikita Kniazev <nok.raven@gmail.com>
Date: Thu, 11 Oct 2018 23:21:23 +0300
Subject: [PATCH] Do not read pipe content at available size peeking

Currently the same data is read twice.

The first time a buffer is filled by `PeekNamedPipe` and second time it is
overwritten with the same content by `ReadFile`.
---
 src/engine/execnt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/engine/execnt.c b/src/engine/execnt.c
index 4e512f149..a712e15d3 100644
--- a/src/engine/execnt.c
+++ b/src/engine/execnt.c
@@ -770,7 +770,7 @@ static void read_pipe
     for (;;)
     {
         /* check if we have any data to read */
-        if ( !PeekNamedPipe( in, ioBuffer, IO_BUFFER_SIZE, &bytesInBuffer,
+        if ( !PeekNamedPipe( in, NULL, IO_BUFFER_SIZE, NULL,
             &bytesAvailable, NULL ) || bytesAvailable == 0 )
             return;