snprintf (buf, buflen, "a%04d", ((IMAP_DATA *) ctx->data)->sequence++);
snprintf (buf, buflen, "a%04d", CTX_DATA->sequence++);
static void imap_make_sequence (char *buf, size_t buflen, CONTEXT *ctx){  snprintf (buf, buflen, "a%04d", ((IMAP_DATA *) ctx->data)->sequence++);}