Johannes Findeisen - hanez.org

Announcing Fun 0.37.62 - The Programming Language that makes You have Fun!

Wed, 28 Jan 2026 00:00:00 +0100

I am a little bit tired actually, so I won’t write detailed information in this blog post now, but I will update this post in the next days.

In the past 5 month it was very hard work to implement the Fun programming language, but I am happy to announce this first release of Fun.

Please read the announcement at https://fun-lang.xyz/2026/01/25/announcing-fun-0.37.62/ if you want more information about having Fun!

I am looking for a Job!

Wed, 07 Jan 2026 00:00:00 +0100

If you are looking for an experienced and talented Linux system administrator/engineer and/or software developer, then you are at the right place…

R.I.P. Windows 10 - Microsoft Sucks!

Wed, 15 Oct 2025 00:00:00 +0200

Windows? For me the most incompatible, most insecure and unusable operating system… :)

Fortunately only in a virtual machine for testing purposes here.

Why I Love C

Tue, 14 Oct 2025 00:00:00 +0200

When I started seriously implementing projects in C over 20 years ago, I was fascinated by the fact that you can do things in memory without using assembly. C is a very straightforward language with one feature that really impresses me: C is incredibly fast.

The argument that C is problematic with pointers doesn’t hold water for me. When programming, it’s my job to program in a resource-efficient way. But I’m a bit old-fashioned in that regard.

Languages like Rust or Go solve many of the problems of C and C++, but they don’t feel as comfortable to me as C. If I had to choose something newer, I would use Rust. But it has hardly any technical background; it’s just a gut feeling I’ve developed over the past 15 years of programming.

Oh, I don’t use C++. This has nothing to do with a technical decision, but I don’t like C++. C++ isn’t nice. Python, for example, is a very nice language. I feel comfortable when programming languages are feeling natural. C feels very natural to me, like speaking english or german. Java is also nice, but I don’t use it anymore because I don’t have a use case for it. And to be honest, Ruby is weird… ;)

Ok, I am mixing languages and use cases. That’s not fair! But syntax is really important when writing code… PHP5 had a beautiful and simple style that I loved when it was first released in 2004.

When I was working on my own programming language (fun) some time ago, wanting to learn more about implementing it in some existing programming language, I chose C, even though I was aware of the advantages of other languages, such as Rust. But C just feels right.

Quote of the day

Fri, 29 Aug 2025 00:00:00 +0200

Quote of the day

Tue, 05 Aug 2025 00:00:00 +0200

Hacking on Android

Wed, 02 Jul 2025 00:00:00 +0200

I wrote a document about installing Alpine Linux on Android some time ago. Today I started working on a new document about setting up a full hacking environment on Android based devices. It shows you a lot more information about running Linux distributions on your mobile/portable device…

I am using a rooted SM-T585 tablet from Samsung running a LineageOS based custom ROM.

The document is not yet finished and will be updated continuously!

Quote of the day

Fri, 27 Jun 2025 00:00:00 +0200

/bin/checkpw

Wed, 04 Jun 2025 00:00:00 +0200

This post was originally postet at https://xw3.org/blog/2024/09/25/checkpw/, but it was the wrong place for my personal stuff. I moved it here to keep the content more up to date.

I created a small C program to authenticate against a UNIX/Pluggable authentication module (PAM) named checkpw. This program is only for verifiying a user’s password, that is registered in /etc/passwd using /etc/shadow, or whatever PAM is configured to use.

The program returns 0 on success, 1 otherwise.

With this program, it will be possible to authenticate an xw3 application user against the system’s user database.

Currently only tested on Linux, but it should work on AIX, DragonFly BSD, FreeBSD, HP-UX, macOS, NetBSD and Solaris operating systems too. I will test API compatibility for all OS’s listed ~~soon~~ maybe some day… ;)

Group permissions will be handled using /etc/group in a seperate program - Maybe just with a small wrapper around the “id” command (not available yet, but it should be easy to implement).

[UPDATE]:Renamed project from checkpw to chkpwd since I believe it is more native UNIX style… ;).

[UPDATE]:Renamed project from chkpwd to chkusr because I merged other code into it. The chkpwd command still exists along with some more commands in the future.

My workspace... ;)

Wed, 30 Oct 2024 00:00:00 +0100

[UPDATE]: To be honest, my real workspace actually looks like this:

My real workspace looks sexy too! Not that chaotic, but with all features enabled! Even Tux got his place...

I believe it's virtual enough... ;)