I guess the order of parameters in difftime function is wrong? It results negative value ...

if (session->api_timeout > 0 &&
(seconds_to_next == 0 ||
seconds_to_next > session->api_timeout)) {
time_t now = time (NULL);
elapsed_ms = (long)(1000*difftime(start_time, now));
if (elapsed_ms > session->api_timeout) {
session->err_code = LIBSSH2_ERROR_TIMEOUT;
return LIBSSH2_ERROR_TIMEOUT;
}
ms_to_next = (session->api_timeout - elapsed_ms);
has_timeout = 1;
}
else if (ms_to_next > 0) {
has_timeout = 1;
}
else
has_timeout = 0;