From ec1752b4178825156201c9e5dffac52f215438ec Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Fri, 11 May 2012 21:11:45 -0500
Subject: [PATCH] Fix invalid call to dd(1)

t4012 assumed that it is okay to seek beyond the end of stdin. It is not,
and leads to an access violation (Windows speak for: segmentation fault)
with MinGW's dd.exe iff run in non-verbose mode.

Further, for some reason 'echo X | dd bs=1k seek=1' resulted in 2050 bytes
in this developer's setup instead of 1026.

So let's use a valid technique to generate 1024 NULs followed by X and a
line feed: a good ole' Perl script.

This patch is dedicated to Randal "Merlyn" Schwartz.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t4012-diff-binary.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 8b4e80de96..40b4530578 100755
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -113,7 +113,7 @@ cat >expect <<EOF
 EOF
 
 test_expect_success 'diff --stat with binary files and big change count' '
-	echo X | dd of=binfile bs=1k seek=1 &&
+	perl -e "print \"\\0\" x 1024; print \"X\\n\";" > binfile &&
 	git add binfile &&
 	i=0 &&
 	while test $i -lt 10000; do