Question

I’m writing an embedded ftp server, and I cannot get the listing format correctly. The server works completely, only programs like FileZilla cannot interpret the listing format. Here’s a sample listing:

-rwxr--r--  1   owner   group 640   1970 01 01  test
-rwxr--r--  1   owner   group 13440 1970 01 01  test.html
-rwxr--r--  1   owner   group 512   1970 01 01  test2.txt

Which is basically:

permissions[tab]number?[tab]owner[tab]group[tab]filesize[tab]date[tab]filename 

What am I doing wrong?

Thanks,
Yvan

Answer 1

As others have already mentioned, you need to use spaces instead of tabs. Here’s a sprintf from another embedded FTP server that should work:

sprintf(line, "%s   1 %-10s %-10s %10lu Jan  1  1980 %s\r\n",
    permstr, username, username,
    length,
    filename);

permstr is set to a string like "-rw-rw-rw-".

As for date formats, these two should work, with the top used if the date is more than 6 months old:

if (dfmt)
    sprintf(buf, "%3.3s %2d  %04d", month_name, month_num, year);
else
    sprintf(buf, "%3.3s %2d %02d:%02d", month_name, month_num, hour, minute);