snprintf (idata->cmd.seq, sizeof (idata->cmd.seq), "a%04d", idata->seqno++);
snprintf (idata->cmd.seq, sizeof (idata->cmd.seq), "a%04u", idata->seqno++);
static void cmd_make_sequence (IMAP_DATA* idata){  snprintf (idata->cmd.seq, sizeof (idata->cmd.seq), "a%04d", idata->seqno++);  if (idata->seqno > 9999)    idata->seqno = 0;}