FreeTDS Development Group

[michael.peppler AT bnpparibas.com]

Actually Sybase defines different sizes for CS_INT depending on 32 or 64bit
wordsize for the platform. This is what the SYB_LP64 #define is for.

CS_INT must be 32bits as it maps to an INT database server datatype
(consider the ct_bind() call, for example).

Michael




Internet
jklowden AT schemamania.org@lists.ibiblio.org - 04/09/2006 00:07


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Subject:    Re: [freetds] CS_INT size bug


On Sun, Sep 03, 2006 at 04:42:12PM -0400, entropy AT freetds.org wrote:
> Norbert Sendetzky wrote:
>
> > I'm using a standard 32bit x86 machine.
> >
> > The problem I'm facing are lots of warnings when compiling the sybase
backend
> > of my library (OpenDBX, http://www.linuxnetworks.de/opendbx/) against
FreeTDS
> > instead of the Sybase ctlib.
> >
> > In Sybase' ctlib, CS_INT is defined as "long" and as "int" in FreeTDS
which is
> > problematic when using printf() functions. This is because of the
different
> > expectations gcc/printf have when handling "%d" and "%ld" modifiers.
>
> The problem is that your code is making assumptions about what type a
> CS_INT is.  If it were reasonable for your code to do that, then there
> would be no such thing as a CS_INT, and instead it would just be "int"
> or "long".
>
> The most portable thing your code can do in this case is explicitly cast
> to a type, then use the printf(3) format for that type.

That's good advice from a C perspective.  The application shouldn't assume
anything about opaque types.

>From the library's perspective, though, maybe we're making a mistake?  We
do a bunch of things in the header files -- e.g. use #define instead of
enum
-- just because that's how Sybase did it 20 years ago.  It wouldn't be
wrong to change it.

Thanks for pointing it out, Norbert.  I don't know what we'll do or what's
even feasible, but it's worth at least discussing.

--jkl

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