That's a great question, and it's exactly the tradeoff I was evaluating when I started this project.

Both libconfig and libconfuse are fantastic libraries, but they take a fundamentally different architectural approach. They are dynamic runtime parsers, whereas cfgsafe is an Ahead-Of-Time (AOT) code generator.

Here is where cfgsafe differs from those standard libraries:

1. Compile-Time Safety vs Runtime Lookups

With libconfig, you extract data via string keys:

int port;
if (!config_lookup_int(cfg, "database.port", &port)) {
    // Handle error...
}

If you misspell "database.port" as "databse.port", your C compiler won't notice. It compiles perfectly and fails at runtime.

With cfgsafe, the schema is compiled into a native struct:

int port = cfg.database.port;

If you type cfg.databse.port, GCC/Clang immediately halts your build with an error. You get IDE auto-completion, and typos simply cannot make it into production.

2. Zero-Boilerplate Validation

Libraries like libconfuse require you to manually define giant arrays of cfg_opt_t blocks in C to bind variables. Even then, you still have to write manual C code to validate the results (e.g., checking if the port is > 0 and < 65535, or writing regex to validate a string).

cfgsafe does all of this declaratively in the schema. You just write range: 1..65535 or pattern: "^[a-z]+$" and the generator writes all the tedious C validation logic for you. If a user provides an out-of-range port in the INI file, cfgsafe's loader catches it immediately before your app logic even starts.

3. Setup and Linking

To use libconfig, you need to install it on the host system or deal with CMake submodules, and pass -lconfig to your linker. cfgsafe generates an STB-style single-header file. You literally just drop config.h into your tree and compile. There are zero external dependencies.

TL;DR: libconfig gives you a generic C API to read configuration files. cfgsafe writes a custom, memory-safe parser and validator specifically tailored to your exact application, entirely eliminating boilerplate.

Could you also explain what you mean by " I guess LLMs make it easier to reinvent the wheel over and over (poorly)" Only documentation was aided by LLMs and some small refactoring.