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From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>
Subject: [PULL 09/10] iotests: Add poke_file_[bl]e functions
Date: Thu, 26 Mar 2020 15:29:32 +0100
Message-ID: <20200326142933.625037-10-mreitz@redhat.com> (raw)
In-Reply-To: <20200326142933.625037-1-mreitz@redhat.com>

Similarly to peek_file_[bl]e, we may want to write binary integers into
a file.  Currently, this often means messing around with poke_file and
raw binary strings.  I hope these functions make it a bit more
comfortable.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Code-suggested-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200324172757.1173824-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 tests/qemu-iotests/common.rc | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 4c246c0450..bf3b9fdea0 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -53,6 +53,30 @@ poke_file()
     printf "$3" | dd "of=$1" bs=1 "seek=$2" conv=notrunc &>/dev/null
 }
 
+# poke_file_le $img_filename $offset $byte_width $value
+# Example: poke_file_le "$TEST_IMG" 512 2 65534
+poke_file_le()
+{
+    local img=$1 ofs=$2 len=$3 val=$4 str=''
+
+    while ((len--)); do
+        str+=$(printf '\\x%02x' $((val & 0xff)))
+        val=$((val >> 8))
+    done
+
+    poke_file "$img" "$ofs" "$str"
+}
+
+# poke_file_be $img_filename $offset $byte_width $value
+# Example: poke_file_be "$TEST_IMG" 512 2 65279
+poke_file_be()
+{
+    local img=$1 ofs=$2 len=$3 val=$4
+    local str=$(printf "%0$((len * 2))x\n" $val | sed 's/\(..\)/\\x\1/g')
+
+    poke_file "$img" "$ofs" "$str"
+}
+
 # peek_file_le 'test.img' 512 2 => 65534
 peek_file_le()
 {
-- 
2.25.1



  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 14:29 [PULL 00/10] Block patches for 5.0-rc1 Max Reitz
2020-03-26 14:29 ` [PULL 01/10] block/mirror: fix use after free of local_err Max Reitz
2020-03-26 14:29 ` [PULL 02/10] block: pass BlockDriver reference to the .bdrv_co_create Max Reitz
2020-03-26 14:29 ` [PULL 03/10] block: trickle down the fallback image creation function use to the block drivers Max Reitz
2020-03-26 14:29 ` [PULL 04/10] qcow2: Comment typo fixes Max Reitz
2020-03-26 14:29 ` [PULL 05/10] qcow2: List autoclear bit names in header Max Reitz
2020-03-26 14:29 ` [PULL 06/10] qcow2: Avoid feature name extension on small cluster size Max Reitz
2020-03-26 14:29 ` [PULL 07/10] sheepdog: Consistently set bdrv_has_zero_init_truncate Max Reitz
2020-03-26 14:29 ` [PULL 08/10] qemu-img: Fix check's leak/corruption fix report Max Reitz
2020-03-26 14:29 ` Max Reitz [this message]
2020-03-26 14:29 ` [PULL 10/10] iotests/138: Test leaks/corruptions fixed report Max Reitz
2020-03-26 16:54 ` [PULL 00/10] Block patches for 5.0-rc1 Peter Maydell

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