local s1, s2 = "Hello" .. string.rep("\0", 8), " World!"
local ffi = require "pluto:ffi"
local libname
if os.platform == "windows" then
     libname = "msvcrt"
elseif os.platform == "macos" then
     libname = "libSystem.B.dylib"
else
     libname = "libc.so.6"
end
local lib = ffi.open(libname)
if lib then
    print($"Shared library, {libname}, found")
    lib:cdef[[
        char *strcat(char *dest, const char *src);
        size_t strlen(const char *str);
    ]]
    local s = lib.strcat(s1, s2)
    print(s)
    print(lib.strlen(s))
    lib = nil
else
    print($"Shared library, {libname}, not found.")
    local s = s1 .. s2
    print(s)
    print(#s)
end