CLIPS via Ruby using FFI

index.rb

module Clips
  extend FFI::Library
  ffi_lib 'clips/libclips.so'
  attach_function :create_environment, :CreateEnvironment, [], :pointer
  attach_function :reroute_stdin, :RerouteStdin, [:pointer, :int, :pointer], :pointer
  attach_function :command_loop, :CommandLoop, [:pointer], :void
end

the_env = Clips.create_environment
Clips.reroute_stdin(the_env, 0, FFI::MemoryPointer.new(:pointer))
Clips.command_loop(the_env)

main.c

#include "clips.h"

int main(
  int argc,
  char *argv[])
  {
   void *theEnv;

   theEnv = CreateEnvironment();
   RerouteStdin(theEnv,argc,argv);
   CommandLoop(theEnv);

   return(-1);
  }