Re: LYNX-DEV Re: DOS, DOS and Windows

[Foteos Macrides]

Wayne Buttles <address@hidden> wrote:
>On Fri, 25 Oct 1996, Foteos Macrides wrote:
>
>>      NULL should be defined in the compiler's headers (stdio.h) as
>> 0 with a void pointer type cast:
>> 
>>      #define NULL ((void *) 0)
>> 
>>      How does Borland C define it?
>> 
>
>For Large and Huge DOS memory models it says:
>
>#define NULL 0L
>
>I wonder what would happen if I made it a ((void *) 0L)...

        I don't know, but would guess that the L serves the same function
as the pointer type cast, and for ANSI C is void so as not to invoke a
warning about it not being whatever it actually is (normally (char *)).

        Try replacing the 0 with ((void *) 0) in the function call and
see how the compiler feels about that.  If it's OK, you probably can
change the header definition, but that's just a guess.

        It may still not like the 0 without an L or type cast in the
function call.

        This kind of thing is why I think it would be a good idea
to spend the couple hours with an editor replacing all the K&R
macros in the current LYFoo and libwww-FM modules with ANSI C
format and seeing how many of the supported Unix flavors are
affected (shouldn't be a problem for any of the VMS compilers).

                                Fote

=========================================================================
 Foteos Macrides            Worcester Foundation for Biomedical Research
 address@hidden         222 Maple Avenue, Shrewsbury, MA 01545
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