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  • From: LacaK <lacak AT zoznam.sk>
  • To: FreeTDS Development Group <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] Assertin failed: unknown bindtype with unknown varlen
  • Date: Tue, 07 Apr 2015 13:52:26 +0200


I think we could add some checks to t0019 test.

Yes good idea! may be add line:
TEST((SYBBINARY, "", 0, SYBBINARY, 8), "len=8 00 00 00 00 00 00 00 00 2A 2A");


I was wondering if your patch cover all cases. Probably would be
better to test for bind == BINARYBIND (which catches all binaries like
VARBINARY or IMAGE).

May be. I used it as there was already: if (SYBCHAR == desttype)
Do you think, that this condition should be changed as well: if (bind == NTBSTRINGBIND) ?
I leave decision up to you.
For me are okay both alternatives.

I will be happy if this will be fixed before new release of FreeTDS ;-)
Added as a TODO in https://trello.com/b/bk0UZNRJ/freetds-todo-list.

Thanks
-Laco.


Thanks
-Laco.
P.S. Sorry for previous empty email :-)


Frediano

Hi,
I get this error "unknown bindtype with unknown varlen" when calling
dbconvert() in dblib.
This is my situation:
I have table with VARBINARY column with value which is empty not null
(dbdatlen() = 0)
Then I call dbconvert with srctype=SQLBINARY, srclen=0,
desttype=SQLBINARY, destlen > 0 and I get above mentioned assertion.

Looking into dbconvert there is in the begining (note condition:
srclen==0):

if (src == NULL || srclen == 0) {
int bind = dbbindtype(desttype);
int size = tds_get_size_by_type(desttype);

if (SYBCHAR == desttype) {
if (destlen > 0) {
size = destlen;
bind = CHARBIND;
} else {
size = 1;
bind = NTBSTRINGBIND;
}
}

dbgetnull(dbproc, bind, size, dest); // <--- HERE OCCURS
ASSERTION
return size;
}

Next look into dbgetnull():

/*
* For variable-length types, nonpositive varlen indicates
* buffer is "big enough" but also not to pad.
* Apply terminator (if applicable) and go home.
*/
if (varlen <= 0) {
switch (bindtype) {
case STRINGBIND:
case NTBSTRINGBIND:
varaddr[pnullrep->len] = '\0';
/* fall thru */
case CHARBIND:
case VARYCHARBIND:
+ case BINARYBIND: // <--- MISSING HERE ?
+ case VARYBINBIND: // <--- MISSING HERE ?
break;

As BINARYBIND is not handled ATM default is executed:
default:
assert(!"unknown bindtype with unknown varlen");

Can you please fix it ?
Thanks
-Laco.
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