[PATCH] hexdump: add test to verify -n4 -e '"%u"'

[Steffen Nurpmeso]

Steffen Nurpmeso wrote in
 <20241023213552.tNfZc0Ju at steffen%sdaoden.eu>:
 |Natanael Copa wrote in
 | <20241023152936.658a4fdd at ncopa-desktop>:
 ||On Wed, 23 Oct 2024 15:11:20 +0200
 ||Natanael Copa <ncopa at alpinelinux.org> wrote:
 ||
 ||> Add test that uncovers bug introduced in busybox 1.37.0
 ...
 ||I git bisected the bug to:
 ||
 ||commit e2287f99fe6f21fd6435ad04340170ad4ba5f6b3
 ||Author: Denys Vlasenko <vda.linux at googlemail.com>
 ||Date:   Thu May 25 17:39:28 2023 +0200
 ...
 |Hm, but i get the same strange result of the thing you had posted
 |to AlpineLinux with an elder version:
 |
 |  $ hexdump -s16 -n4 -e '"%u"' test;echo
 |  1094795585
 |  $ busybox.static hexdump -s16 -n4 -e '"%u"' test;echo
 |  65
 |  $ busybox.static | sed '2,$d'
 |  BusyBox v1.37.0.git (2024-04-20 23:25:28 CEST) multi-call binary

Interesting that a fix to the later commit fixes the thing.
I have this binary around, in case of interest, and it definitely
has that bug:

  $ ll /sbin/busybox.static
  -rwsr-xr-x 1 root root 1955192 Apr 20  2024 /sbin/busybox.static*
  $ file /sbin/busybox.static
  /sbin/busybox.static: setuid ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=cd6cdfd724de9afa375bab47e3244473d2e9501a, for GNU/Linux 5.10.0, stripped

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)