/*********************************************************************************
 *      Copyright:  (C) 2025 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  dir.c
 *    Description:  This file is directory API example
 *
 *        Version:  1.0.0(10/15/2025)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "10/15/2025 03:39:52 PM"
 *
 ********************************************************************************/

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>

#define TEST_DIR    "tmp"

int main(int argc, char **argv)
{
    int               rv = 0;
    int               fd1;
    int               fd2;
    DIR              *dirp;
    struct dirent    *direntp;

    /* 创建文件夹dir, 并设置文件夹权限为755 */
    if( mkdir(TEST_DIR, 0755)<0 )
    {
        printf("create directory '%s' failure: %s\n", TEST_DIR, strerror(errno));
        return -1;
    }

    /* 更改当前工作路径到文件夹dir下去 */
    if( chdir(TEST_DIR)<0 )
    {
        printf("Change directory to '%s' failure: %s\n", TEST_DIR, strerror(errno));
        rv = 2;
        goto cleanup;
    }

    /* 在dir文件夹下 创建普通文本文件file1.txt，并设置其权限位为644 */
    if( (fd1=creat("file1.txt", 0644)) < 0 )
    {
        printf("Create file1.txt failure: %s\n", strerror(errno));
        rv = 3;
        goto cleanup;
    }

    /* 在dir文件夹下 创建普通文本文件file2.txt，并设置其权限位为644 */
    if( (fd2=creat("file2.txt", 0644)) < 0 )
    {
        printf("Create file2.txt failure: %s\n", strerror(errno));
        rv = 4;
        goto cleanup;
    }

    /* 更改当前工作路径到父目录去 */
    if( chdir("../")<0 )
    {
        printf("Change directory to '%s' failure: %s\n", TEST_DIR, strerror(errno));
        rv = 5;
        goto cleanup;
    }

    /* 打开dir文件夹 */
    if((dirp=opendir(TEST_DIR)) == NULL)
    {
        rv = 6;
        printf("opendir %s error: %s\n", TEST_DIR, strerror(errno));
        goto cleanup;
    }

    /* 列出dir里面的所有文件和文件夹 */
    while((direntp = readdir(dirp)) != NULL)
    {
        printf("Find file: %s\n", direntp->d_name);
    }

    /* 关闭所有打开的文件夹 */
    closedir(dirp);

cleanup:
    if(fd1 >= 0)
        close(fd1);

    if(fd2 >= 0)
        close(fd2);

    return rv;
}