The f_getcwd function retrieves the current directory and current drive.
FRESULT f_getcwd ( TCHAR* buff, /* [OUT] Buffer to return path name */ UINT len /* [IN] Buffer length */ );
FR_OK, FR_DISK_ERR, FR_INT_ERR, FR_NOT_READY, FR_NOT_ENABLED, FR_NO_FILESYSTEM, FR_TIMEOUT, FR_NOT_ENOUGH_CORE
The f_getcwd function retrieves full path name of the current directory of the current drive. When FF_VOLUMES >= 2, a heading drive prefix is added to the path name. The style of drive prefix depends on FF_STR_VOLUME_ID.
Available when FF_FS_RPATH == 2.
    FRESULT fr;
    TCHAR str[SZ_STR];
    fr = f_getcwd(str, SZ_STR);  /* Get current directory path */