FreeTDS Development Group

[ZIGLIO Frediano <Frediano.Ziglio AT vodafoneomnitel.it>]

> 
> > ctlib/dblib specification document that buffer is unchanged 
> if text exceed
> > destlen ?
> > I not I don't see the problem.
> > 
> 
> they don't say, but practically that is what happens...
> 

Cruncking...

- conversion from fixed size type to fixed size type can be handled by
tds_convert without problem
- conversion from variable size type (char/binary/text/varchar/image/blob
and others) to fixed size type can be handled by tds_convert too

So problem are conversion to variable size.
- conversion from variable size to variable size can be handled directly
from libraries (they are merely binary copy).
- conversion from fixed size to variable size must be passed to tds_convert
but cannot be copied to destination by tds_convert. So pasing back to
library convert is a solution, but require allocate buffer and put back to
library. Alternative solution is the old solution (tds_convert know all
method to pass back data to library, but implementation) and a callback
solution (tds_convert call at and a library supplied function to do the
final conversion...)

I think I'll try to implement this last solution (from latest CVS version).
It should solve all problem...

Also some problem seen in latest patches:
- vb field in CONV_RESULT is only written in tds_convert but not back to
calling program
- in dblib you test and process if desttype == srctype but you fall back to
tds_convert

freddy77

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