GitHub - mattn/cisp: Minimal Lisp Interpreter

A compact Lisp interpreter written in C.

Features

Cross-platform: Runs on Linux, macOS, and Windows
Lightweight: Single binary with minimal dependencies
Lisp-2: Functions and variables have separate namespaces
Dynamic library support: Load shared libraries with the load function
First-class continuations: Supports call/cc
Tail call optimization: Efficient execution of recursive functions
Macro system: Full macro support with backquote syntax
Rich data types: Integers, floats, characters, strings, symbols, and cons cells
C plugin support: Write plugins in C for extending functionality

You can extend cisp with C plugins. See example/hello.c for an example:

int cisp_init(ENV *env) {
  add_sym(env, NODE_BUILTINFUNC, "hello", do_hello);
  return 0;
}

Compile with:

# Linux
gcc -fPIC -I. -shared -o lib/hello.so ./example/hello.c

# Windows
gcc -fPIC -I. -shared -o lib/hello.so ./example/hello.c libcisp.a