ESP32 Forum

Posted: **Tue Jul 11, 2023 4:05 am**

Hello there!

I just started a serious hobby project with ESP32 using esp-idf. This project uses SD Card for storing various data points that are organized in nested directories, and I would like to write a method similar to MakeSureDirectoryPathExists(). Basically I am looking for a function that will create all non-existing sub-directories in a directory path.

Let us say my SD Card is mounted as /sdcard, and I already have a directory in it viz., "/sdcard/data", so if I call this method with "/sdcard/data/devices/sensor1/data.csv", it should create sub-folders "devices" and "sensor1" (under respective parent directories of course). How can I do that in esp-idf? Since mine is a new project I am free to use any available library or filesystem that can make it easier to implement this function.

Thanks in advance!

Posted: **Tue Jul 11, 2023 12:06 pm**

Ok... this is what I came up with. I just got mkdir() working as expected including the /sdcard mount point in the directory path.

Code: [Select all] [Expand/Collapse]

 
void MyESPApp::MakesureDirectoryPathExists(char *filePath)
{
    char *fullPath = filePath;
    filePath++; // Skip the leading path delimiter
    while (*filePath && *filePath != '/')
        filePath++; // skip mountpoint
 
    while (*filePath)
    {
        if (*filePath == '/')
        {
            *filePath = '\0';
            mkdir(fullPath, 0755);
            *filePath = '/';
        }
 
        filePath++;
    }
}
 

GeSHi © Codebox Plus Extension

Posted: **Tue Jul 11, 2023 12:54 pm**

Modified the code to call mkdir only if the directory does not exist.

Code: [Select all] [Expand/Collapse]

void ESPApp::MakesureDirectoryPathExists(char *filePath)
{
    char *directory = filePath;
 
    filePath++; // Skip the leading path delimiter
    while (*filePath && *filePath != '/')
        filePath++; // skip mountpoint
 
    while (*filePath)
    {
        if (*filePath == '/')
        {
            *filePath = '\0';
 
            //mkdir(fullPath, 0755);
 
            struct stat s;
            bool directory_exists = stat(directory, &s) == 0;
            if (!directory_exists) 
            {
                if (mkdir(directory, 0775) != 0) 
                {
                    ESP_LOGE(TAG, "mkdir failed with error: %s\n", strerror(errno));
                }
            }
 
            *filePath = '/';
        }
 
        filePath++;
    }
}

Posted: **Wed Jul 12, 2023 7:06 am**

hasukuma wrote: ↑
Tue Jul 11, 2023 12:54 pm
Modified the code to call mkdir only if the directory does not exist.

Not needed because mkdir will check the same thing again (and yield errno EEXIST if it does).

ESP32 Forum

How to implement MakeSureDirectoryPathExists() in esp-idf?

How to implement MakeSureDirectoryPathExists() in esp-idf?

Re: How to implement MakeSureDirectoryPathExists() in esp-idf?

Re: How to implement MakeSureDirectoryPathExists() in esp-idf?

Re: How to implement MakeSureDirectoryPathExists() in esp-idf?