This is a simple Zip file unpacker originally from Parzip. It originally used exceptions for all error flow but it was then converted into using only GLib style error objects. This gives us a real world code base which is useful for testing purposes.
meson <build dir>
ninja
ninja test # to run the test suite
The error code version can be built with or without -fno-exceptions. To enable the switch invoke this command in the build dir:
mesonconf -Dnoexcept=true
ninja
How to disable it is left as an exercise to the reader. :)
Every function that may fail takes an argument of type Error ** which must point to an Error * with the value nullptr. The caller must then check the error value and if it is no longer nullptr, then an error has occurred and the caller must behave appropriately. Almost always this means aborting current work, releasing all resources and passing the error up the call chain.
This allows the error handler to return dynamic error messages and to be naturally thread safe. This is not possible with C APIs modeled after errno and strerror.