Function json_arg_init

app/redis-6.2.6/deps/lua/src/lua_cjson.c:208–217

Ensure the correct number of arguments have been provided. * Pad with nil to allow other functions to simply check arg[i] * to find whether an argument was provided */

 * Pad with nil to allow other functions to simply check arg[i]
 * to find whether an argument was provided */
static json_config_t *json_arg_init(lua_State *l, int args)
{
    luaL_argcheck(l, lua_gettop(l) <= args, args + 1,
                  "found too many arguments");

    while (lua_gettop(l) < args)
        lua_pushnil(l);

    return json_fetch_config(l);
}

/* Process integer options for configuration functions */
static int json_integer_option(lua_State *l, int optindex, int *setting,