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From: higgin@cbmvax.UUCP
Newsgroups: net.micro.amiga
Subject: Re: Pointers and AllocMem with Aztec
Message-ID: <398@cbmvax.cbmvax.cbm.UUCP>
Date: Thu, 12-Jun-86 14:40:27 EDT
Article-I.D.: cbmvax.398
Posted: Thu Jun 12 14:40:27 1986
Date-Received: Tue, 17-Jun-86 05:41:49 EDT
References: <1868@gitpyr.UUCP>
Reply-To: higgin@cbmvax.UUCP (Paul Higginbottom)
Organization: Commodore Technology, West Chester, PA
Lines: 52

In article <1868@gitpyr.UUCP> lbg@gitpyr.UUCP (Lee B Grey) writes:
>
>I have spent all day trying to get AllocMem to work with my Aztec
>compiler.  I refuse to break down and use 32-bit integers.  So
>what am I supposed to do??  I have tried the code in the RKM,
>which does not work.  I have tried declaring AllocMem() as:
>  extern APTR         long             APTR
>  extern APTR *       long *           APTR *
>  struct APTR *       char             void
>  struct APTR         char *           void *
>None of them work.  They all return a NULL pointer!  BTW, I am not
>as dumb as this looks.  I knew that void would not work.  But take a
>look at Aztec's list of Amiga functions AND at the functions.h file
>in the include directory -- they both list AllocMem as a void of all
>things!!
>
>Bottom line:  If anyone can tell me how to AllocMem a structure (I am
>trying for FileInfoBlock), without using the 32-bit compiler option and
>32-bit linker library, PLEASE let me know!  Please reply through mail, as
>I am too busy banging my head against the wall to read news with any
>regularity.
>
>Thanks, dudes and dudettes!
>
>Lee

Well Lee, I hope you get this on the net, I sypathize with you - but I
had no trouble, and am one ecstatically happy Aztec C user, and I NEVER
use the 32 bit option.

The trick you're probably missing is not casting sizeof( to a long, because
AllocMem() and ALL NON-AZTEC FUNCTIONS expect LONGS for all numeric
parameters.  The following fragment will work, guaranteed.

#include <libraries/dosextens.h>
#include <exec/memory.h>

extern void *AllocMem();

struct FileInfoBlock *GetAFib()
{
        return(AllocMem((long)sizeof(struct FileInfoBlock), MEMF_PUBLIC));
}

The void * declaration of AllocMem is convenient because Aztec C doesn't
complain about equating pointers to voids to any other type without a
cast.  (This is in the manual).

        Regards,
                Paul Higginbottom

Disclaimer: I do not work for Commodore and my opinions are at least my own.