Psych.libyaml_version

static VALUE libyaml_version(VALUE module)
{
    int major, minor, patch;
    VALUE list[3];

#ifdef PSYCH_USE_LIBFYAML
    /* Experimental libfyaml backend: there is no libyaml linked in.  Report
     * the libfyaml version so callers still receive a 3-element version. */
    const struct fy_version *v = fy_version_default();
    major = v ? v->major : 0;
    minor = v ? v->minor : 0;
    patch = 0;
#else
    yaml_get_version(&major, &minor, &patch);
#endif

    list[0] = INT2NUM(major);
    list[1] = INT2NUM(minor);
    list[2] = INT2NUM(patch);

    return rb_ary_new4((long)3, list);
}