Sanitizers, The Alternative To Valgrind

Valgrind is an incredibly powerful tool which helps find leaks, buffer overflows and many other things. Whilst being extremely powerful it can also be very slow. As an alternative there are little known tools that are available for Clang and GCC which can fulfil similar functions for your C / C++ applications but with much higher performance.

I’ve had several people ask me about the sanitizers recently and how to use them, so I’ll cover some basics here.

Continue reading Sanitizers, The Alternative To Valgrind

My Journey Learning The Go Programming Language

The key to learning anything new is finding a way to engage with the material. Some people learn by reading and some learn by doing. I typically fall into the latter half and I’ve typically been more successful in mentoring people who learn in a more hands-on way.

A recent Tweet I made led to a chat which somehow led to a famous Open Source developer getting me kickstarted into the world of developing in the Go Programming Language. This post tracks some of my journey for the last week (my first week of learning Go).

Continue reading My Journey Learning The Go Programming Language

POSIX File Handling and Undefined Behaviour

Whilst porting code between Linux and macOS I have come across two issues which make assumptions about how something works but in reality different implementations of libc handle them differently. In this post I’ll talk about recent issues I faced with fopen() and fclose() in codebases.

Continue reading POSIX File Handling and Undefined Behaviour

Nested Variadic Functions in C

You may be familiar with variadic functions in C, these are basically functions that allow a variable number of parameters, they are normally written like this:

void my_print_func(const char *format, ...)
    va_list args;
    va_start(args, format);
    vprintf(format, args);

Obviously you can do more with them and they are very useful, but if you want to have one function calling another things can get complicated. This post explores the problem and a couple of ways of solving it.

Continue reading Nested Variadic Functions in C

Unicode 7 in CentOS 7 TUI Code

I’m in the middle of developing a project in C which uses NCurses and Unicode 7+ characters. This has been working out great in macOS and Fedora 31 where I have been doing most of my testing. But in CentOS I have been having big problems getting the characters to render. This post goes into why and how to fix it.

Continue reading Unicode 7 in CentOS 7 TUI Code

Fixing an OpenSSL issue with Curl and Autotools

One project I created at MariaDB is libMariaS3 [source, documentation]. It is a lightweight simple LGPL licensed API to access Amazon S3 and compatible object storage implementations. We created it so that GPL v2.0 licensed projects could use S3 without the license incompatibility of Amazon’s Apache 2.0 licensed SDK.

MariaDB itself uses this for the new S3 storage engine coming in 10.5 and several other upcoming projects. I designed it to be easy to use for anyone outside of MariaDB just in case some other project would find it useful.

Continue reading Fixing an OpenSSL issue with Curl and Autotools