SntpStatus_t Sntp_ConvertToUnixTime()

in source/core_sntp_serializer.c [802:843]

• 28 lines of code
• 7 McCabe index (conditional complexity)

SntpStatus_t Sntp_ConvertToUnixTime( const SntpTimestamp_t * pSntpTime,
                                     uint32_t * pUnixTimeSecs,
                                     uint32_t * pUnixTimeMicrosecs )
{
    SntpStatus_t status = SntpSuccess;

    if( ( pSntpTime == NULL ) || ( pUnixTimeSecs == NULL ) || ( pUnixTimeMicrosecs == NULL ) )
    {
        status = SntpErrorBadParameter;
    }
    /* Check if passed time does not lie in the [UNIX epoch in 1970, UNIX time overflow in 2038] time range. */
    else if( ( pSntpTime->seconds > SNTP_TIME_AT_LARGEST_UNIX_TIME_SECS ) &&
             ( pSntpTime->seconds < SNTP_TIME_AT_UNIX_EPOCH_SECS ) )
    {
        /* The SNTP timestamp is outside the supported time range for conversion. */
        status = SntpErrorTimeNotSupported;
    }
    else
    {
        /* Handle case when timestamp represents date in SNTP era 1
         * (i.e. time from 7 Feb 2036 6:28:16 UTC onwards). */
        if( pSntpTime->seconds <= SNTP_TIME_AT_LARGEST_UNIX_TIME_SECS )
        {
            /* Unix Time ( seconds ) = Seconds Duration in
             *                         [UNIX epoch, SNTP Era 1 Epoch Time]
             *                                        +
             *                           Sntp Time since Era 1 Epoch
             */
            *pUnixTimeSecs = UNIX_TIME_SECS_AT_SNTP_ERA_1_SMALLEST_TIME + pSntpTime->seconds;
        }
        /* Handle case when SNTP timestamp is in SNTP era 1 time range. */
        else
        {
            *pUnixTimeSecs = pSntpTime->seconds - SNTP_TIME_AT_UNIX_EPOCH_SECS;
        }

        /* Convert SNTP fractions to microseconds for UNIX time. */
        *pUnixTimeMicrosecs = pSntpTime->fractions / SNTP_FRACTION_VALUE_PER_MICROSECOND;
    }

    return status;
}