FRESULT f_readdir (
  DIR* dp,      /* [IN] Directory object */
  FILINFO* fno  /* [OUT] File information structure */
);

Description

The f_readdir function reads a directory item, informations about the object. All items in the directory can be read in sequence by f_readdir function calls. Dot entries ("." and "..") in the sub-directory are filtered out and they will never appear in the read items. When all directory items have been read and no item to read, a nul string is stored into the fno->fname[] without any error. When a null pointer is given to the fno, the read index of the directory object is rewinded.

When support of long file name (LFN) is enabled, a member altname[] is defined in the file information structure to store the short file name of the object. In case of the some conditions listed below, short file name is stored into the fname[] and altname[] has a null string.

• The item has no long file name. (Not the case at exFAT volume)
• Setting of _MAX_LFN is insufficient for the long file name. (Not the case at _MAX_LFN == 255)
• The long file name contains any character not allowed in ANSI/OEM code. (Not the case at _LFN_UNICODE == 1)

There is a problem on reading a directory of exFAT volume. The exFAT does not support short file name. This means no name can be returned on the condition above. If it is the case, "?" is returned into the fname[] to indicate that the object is not accessible. To avoid this problem, configure FatFs _LFN_UNICODE = 1 and _MAX_LFN = 255 to support the full feature of LFN specification.

FRESULT scan_files (
    char* path        /* Start node to be scanned (***also used as work area***) */
)
{
    FRESULT res;
    DIR dir;
    UINT i;
    static FILINFO fno;


    res = f_opendir(&dir, path);                       /* Open the directory */
    if (res == FR_OK) {
        for (;;) {
            res = f_readdir(&dir, &fno);                   /* Read a directory item */
            if (res != FR_OK || fno.fname[0] == 0) break;  /* Break on error or end of dir */
            if (fno.fattrib & AM_DIR) {                    /* It is a directory */
                i = strlen(path);
                sprintf(&path[i], "/%s", fno.fname);
                res = scan_files(path);                    /* Enter the directory */
                if (res != FR_OK) break;
                path[i] = 0;
            } else {                                       /* It is a file. */
                printf("%s/%s\n", path, fno.fname);
            }
        }
        f_closedir(&dir)
    }

    return res;
}


int main (void)
{
    FATFS fs;
    FRESULT res;
    char buff[256];


    res = f_mount(&fs, "", 1);
    if (res == FR_OK) {
        strcpy(buff, "/");
        res = scan_files(buff);
    }

    return res;
}