String Hashtable in C

Posted on March 28, 2020

Introduction We have this amazing generic hashtable and we can put pretty much anything we want into it, but it has a few flaws. It uses void pointers and has a pretty verbose setup with that callback struct. If you’re using the same types over and... Continue reading

Generic Hashtable in C

Posted on March 6, 2020

Introduction So, C doesn’t have a native hashtable object but that’s not a problem because we can use one one someone else wrote. Lack of a robust standard library is probably the biggest impoundments of working with C. It’s a real shame C doesn’t natively support hashtables because they... Continue reading

Formatting Strings for Logging

Posted on February 19, 2020

Introduction I’ve been working on a project, and I needed to add logging to the app. I wanted a log formatting function that can take a prefix and a format string (think a sprintf-type format string but safer). This function needs to be more than just an... Continue reading

Validating Constant Time String Comparison In C

Posted on January 20, 2020

Introduction Awhile back I wrote a constant time string comparison function. I briefly mentioned how the compiler can optimize away some of what makes the function constant time. Specifically, the k++ counter used to balance the increment when the forward scan of s2 stops.... Continue reading

Python Http Server

Posted on December 10, 2019

Introduction Quite often I find that I need to serve some files for viewing in a web browser. Most recently, I needed to do this with an in progress OpenAPI document as rendered by ReDoc. All I needed was something that can serve static files. I really didn’t... Continue reading

Python Self Signed Cert Gen

Posted on November 14, 2019

Introduction Sometimes I need to write a simple network server to emulate an application I’m integrating with. Typically, this is ends up being a throw away Python script that allows me to easily inspect at a request and returns a basic response. It’s handy to verify what I’m sending... Continue reading

Python Binary to C Header

Posted on October 9, 2019

Introduction Once again I needed to embed some text files into a C application. The right way to do this is turn the data into a byte array and compile it in. At least it’s the most portable way because some compilers have string length limitations. xxd... Continue reading

Making MiniZip Easier to Use

Posted on September 8, 2019

Introduction Zip files are one of the most popular archive formats out there, and there are a lot of things you can do with them. While working with the ePub ebook format I spent a lot of time working with zip files. Thankfully, the standards committee for ePub used... Continue reading

Read Write File C Helpers

Posted on August 18, 2019

Introduction Reading and writing files in C isn’t as difficult as it sounds. A few simple loops are all you really need. That said, it’s nice to have a few helper functions ready to drop into a project. Before we write anything we need to think about the choice... Continue reading

Recursive Create Directory in C Revisited

Posted on July 10, 2019

Awhile back I wrote a function to recursively create directories in C. It used a string builder to split the parts and rebuild the path. The way mkdir works is by taking a single directory that does not exist and creates it. If there are multiple... Continue reading

Unsigned Count Down

Posted on June 2, 2019

Introduction Something that comes up surprisingly often is traversing an array backwards. Maybe you’re emptying a queue. How about my personal favorite, reversing the order of elements. Counting in a for loop is so common you just don’t think about it. But counting backwards can lead to... Continue reading

Lua For Loop Scope

Posted on May 20, 2019

Introduction One odd thing about Lua when compared to other programming languages is, everything is global by default. Take this for example: function func_a() q_var = 7 end func_a() print(q_var) Once... Continue reading

Thread Pool in C

Posted on April 12, 2019

Introduction When I was writing Poddown I needed a thread pool and I needed one that is cross platform. Since it’s a lightweight app I didn’t want to include a big third party threading library. So I wrote my own. Why a Thread Pool Creating threads can... Continue reading

Cross Platform Thread Wrapper

Posted on April 5, 2019

Introduction There are many open source applications which use threading and are limited to either *nix or Windows because Windows handles threading a bit differently than *nix. I develop on macOS so pthreads is my go to but using it effectively locks me out of Windows because Windows doesn’t... Continue reading

Looping Through Bytes to Check for Bits

Posted on March 22, 2019

Checking for bits in 1 byte is easy. Checking in 2 bytes is also easy. Checking an odd number of bits in a variable number bytes isn’t so easy. The hard part is dealing with the boundary between bytes where we need to move from one to the next. Lets... Continue reading
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