How to implement MakeSureDirectoryPathExists() in esp-idf?

[hasukuma]

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!

[hasukuma]

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]

1.  
2. void MyESPApp::MakesureDirectoryPathExists(char *filePath)
3. {
4.     char *fullPath = filePath;
5.     filePath++; // Skip the leading path delimiter
6.     while (*filePath && *filePath != '/')
7.         filePath++; // skip mountpoint
8.  
9.     while (*filePath)
10.     {
11.         if (*filePath == '/')
12.         {
13.             *filePath = '\0';
14.             mkdir(fullPath, 0755);
15.             *filePath = '/';
16.         }
17.  
18.         filePath++;
19.     }
20. }
21.  

GeSHi © Codebox Plus Extension

[hasukuma]

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

Code: [Select all] [Expand/Collapse]

1. void ESPApp::MakesureDirectoryPathExists(char *filePath)
2. {
3.     char *directory = filePath;
4.  
5.     filePath++; // Skip the leading path delimiter
6.     while (*filePath && *filePath != '/')
7.         filePath++; // skip mountpoint
8.  
9.     while (*filePath)
10.     {
11.         if (*filePath == '/')
12.         {
13.             *filePath = '\0';
14.  
15.             //mkdir(fullPath, 0755);
16.  
17.             struct stat s;
18.             bool directory_exists = stat(directory, &s) == 0;
19.             if (!directory_exists)
20.             {
21.                 if (mkdir(directory, 0775) != 0)
22.                 {
23.                     ESP_LOGE(TAG, "mkdir failed with error: %s\n", strerror(errno));
24.                 }
25.             }
26.  
27.             *filePath = '/';
28.         }
29.  
30.         filePath++;
31.     }
32. }

GeSHi © Codebox Plus Extension

[MicroController]

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).