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. Every item 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 null 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. If the long file name is not accessible due to some reason listed below, short file name is stored to the fname[] and altname[] has a null string.

• The item has no LFN. (Not the case at exFAT volume)
• Setting of FF_MAX_LFN is insufficient to handle the LFN. (Not the case at FF_MAX_LFN == 255)
• Setting of FF_LFN_BUF is insufficient to store the LFN.
• The LFN contains some character not defined in current code page. (Not the case at FF_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 FF_LFN_UNICODE >= 1 and FF_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;
}