[freetds] tds_get_size_by_type for SYBMSDATE

Frediano Ziglio freddy77 at gmail.com
Thu Apr 10 03:51:52 EDT 2014


2014-04-10 8:48 GMT+01:00 LacaK <lacak at zoznam.sk>:
>
>>
>> 24 ?? On my 64 bit machine is 16 and should be 16.
>
> I did some testing and googling and it seems, that inter - padding in
> structures can vary compiler to compiler.
> (as C++ standard does not strictly defines binary layout)
> It seems, that Microsoft uses his "own padding and sizing" with bit-fields.
>
> I did small change in TDS_DATETIMEALL, which gives me now 16 bytes size (as
> in your case):
> typedef struct
> {
>    TDS_UINT8    time;    /* time, 7 digit precision */
>    TDS_INT      date;    /* date, 0 = 1900-01-01 */
>    TDS_SMALLINT offset;    /* time offset */
> // HERE "unsigned short" instead of "unsigned":
>    unsigned short time_prec:4;
>    unsigned short has_time:1;
>    unsigned short has_date:1;
>    unsigned short has_offset:1;
> } TDS_DATETIMEALL;
>
> So now we have: 8 bytes + 4 bytes + 2 bytes + 2 bytes = 16 bytes (seems,
> that no padding occurs at end because 16 mod 8 = 0)
> Can you change please "unsigned" to "unsigned short" in definition of
> TDS_DATETIMEALL ?
>
> -Laco.


Was thinking the same. Probably even better TDS_USMALLINT

Frediano


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