/*!A cross-platform build utility based on Lua
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright (C) 2015-present, TBOOX Open Source Group.
 *
 * @author      OpportunityLiu, ruki
 * @file        file_size.c
 *
 */

/* //////////////////////////////////////////////////////////////////////////////////////
 * trace
 */
#define TB_TRACE_MODULE_NAME    "file_size"
#define TB_TRACE_MODULE_DEBUG   (0)

/* //////////////////////////////////////////////////////////////////////////////////////
 * includes
 */
#include "prefix.h"

/* //////////////////////////////////////////////////////////////////////////////////////
 * implementation
 */

// io.file_size(file)
tb_int_t xm_io_file_size(lua_State* lua)
{
    // check
    tb_assert_and_check_return_val(lua, 0);

    // is user data?
    if (!lua_isuserdata(lua, 1))
        xm_io_return_error(lua, "get size for invalid file!");

    // get file
    xm_io_file_t* file = (xm_io_file_t*)lua_touserdata(lua, 1);
    tb_check_return_val(file, 0);

    // get file length
    if (xm_io_file_is_file(file))
    {
        // get size from raw file stream, because we cannot get size from fstream
        tb_assert(file->stream);
        lua_pushnumber(lua, (lua_Number)tb_stream_size(file->stream));
        return 1;
    }
    else xm_io_return_error(lua, "get size for invalid file!");
}
