linux遍历目录源代码

<pre code_snippet_id="1622396" snippet_file_name="blog_20160324_1_744516" name="code" class="cpp">遍历目录获取整个目录的占用空间:

uint64_t dir_space(char *path)
{
    int ret = 0;
    uint64_t space = 0;

    char cur_dir[PATH_MAX + 1] = {0};

    DIR *dir = NULL;
    struct dirent *ent = NULL;

    if (NULL == path)
    {
        return 0;
    }

    dir = opendir(path);
    if (NULL == dir)
    {
        return 0;
    }

    if (NULL == getcwd(cur_dir, PATH_MAX))
    {
        closedir(dir);
        return 0;
    }

    chdir(path);
    printf("current dir is %s
", path);

    ent = readdir(dir);
    while (NULL != ent)
    {
        if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        {
            space += 4096;
            goto GOON;
        }

        if (ent->d_type == DT_DIR)
        {
            space += 4096;
            space += dir_space(ent->d_name);
        }
        else
        {
            struct stat st;
            lstat(ent->d_name, &st);

            space += st.st_size;
        }

GOON:
        ent = readdir(dir);
    }

    chdir(cur_dir);
    closedir(dir);
    printf("out of dir %s
", path);

    return space;
}