Function test_env_bool

tests/ds4_test.c:16–19

    const char *model_path = getenv("DS4_TEST_MODEL");
    return (model_path && model_path[0]) ? model_path : "ds4flash.gguf";
}

static bool test_env_bool(const char *name) {
    const char *v = getenv(name);
    return v && v[0] && strcmp(v, "0") != 0;
}