Alban Hertroys <dalroi@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> writes:
> I changed it to:
>> SET_VARSIZE(tv->vl_len_, a);
This is just wrong; use SET_VARSIZE(tv, ...).
>> memcpy( tv->vl_dat, &typev->val, b );
And I wouldn't recommend referencing vl_dat directly either.
Use VARDATA().
In general you're supposed to apply VARSIZE() and VARDATA() and
friends to pointers not Datums. Although it would usually work
to be sloppy about this, I can't recommend it. I would extract
the typev pointer first and then apply the VARSIZE macro to it.
> (gdb) print *tv
> $1 = {vl_len_ = "\000\000\000", vl_dat = ""}
> (gdb) print a
> $2 = 0
> (gdb) print b
> $3 = -4
> (gdb) print *typev
> $4 = {len = "\020\000\000", tag = 68899, val = "!\000\000"}
Where did the input come from? On a little-endian machine that len
value means 4 bytes, so it's wrong right off the bat if it's
supposed to include the tag.
regards, tom lane
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