static ShadowStatus_t validateName()

in source/shadow.c [377:426]
43 lines of code
9 McCabe index (conditional complexity)

static ShadowStatus_t validateName( const char * pString,
                                    uint16_t stringLength,
                                    uint8_t maxAllowedLength,
                                    uint8_t * pNameLength )
{
    uint16_t index = 0U;
    ShadowStatus_t returnStatus = SHADOW_FAIL;
    uint8_t parsedName = 0U;

    for( ; index < stringLength; index++ )
    {
        /* The name should always be terminated by a forward slash */
        if( pString[ index ] == ( char ) '/' )
        {
            parsedName = 1U;
            break;
        }
    }

    if( parsedName == 1U )
    {
        if( index == 0U )
        {
            LogDebug( ( "Not a Shadow topic. Unable to find a %s name in the topic.",
                        ( maxAllowedLength == SHADOW_THINGNAME_MAX_LENGTH ) ? "Thing" : "Shadow" ) );
        }
        else if( index > maxAllowedLength )
        {
            LogDebug( ( "Not a Shadow topic. Extracted %s name length of %u exceeds maximum allowed length %u.",
                        ( maxAllowedLength == SHADOW_THINGNAME_MAX_LENGTH ) ? "Thing" : "Shadow",
                        ( unsigned int ) index,
                        ( unsigned int ) maxAllowedLength ) );
        }
        else
        {
            /* Only accept names of greater than zero length.
             * The variable `index` will not exceed the 8 bit integer width here
             * since it will be lesser than the 8 bit integer `maxAllowedLength`. */
            *pNameLength = ( uint8_t ) index;
            returnStatus = SHADOW_SUCCESS;
        }
    }
    else
    {
        LogDebug( ( "Not a Shadow topic. Unable to find a %s name in the topic.",
                    ( maxAllowedLength == SHADOW_THINGNAME_MAX_LENGTH ) ? "Thing" : "Shadow" ) );
    }

    return returnStatus;
}