Date: Thu, 18 Dec 1997 17:19:57 -0800 (PST)
Message-Id: <199712190119.RAA12129@adit.ap.net>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
To: Greg Moorer <gam3 AT Ra DOT MsState DOT Edu>
From: Nate Eldredge <eldredge AT ap DOT net>
Subject: Re: movedata.h problems
Cc: djgpp AT delorie DOT com, djgpp-workers AT delorie DOT com
Precedence: bulk

At 08:59  12/18/1997 -0600, Greg Moorer wrote:
><snip>
>> + __DJ_size_t
>> + #undef __DJ_size_t
>> + #define __DJ_size_t
>
>I never woulda figured that out by myself.  
It was fairly simple, after looking at it some. I looked at preprocessor
output to find that `size_t' didn't get defined, saw how that was done in
djtypes.h, and looked at how string.h used the macro.
>Do you know which way is the
>proper way to call the _dosmemputl function?  Should the parameters be
>(*buffer, num_32bit_words_to_move, *dest_addr) like it is in the
>prototype, or (*buffer, *dest_addr, num_...) like it is in all the
>provided examples.
The prototype is correct. (buffer, transfers, dest_addr)
But as somebody pointed out, using `dosmemput' and nearptr is
counterproductive. If you use nearptrs, then `memcpy' will work.
>-Greg
>
>P.S.  This would be a fast way to transfer a double buffer, would it not?
Yup.
>Is there an extended ASM macro to move 32 bits at a time?
That's what `dosmemputl' does inside. The `rep movsl' instruction will move
%ecx 32-bit longwords from %ds:%esi to %es:%edi.

Nate Eldredge
eldredge AT ap DOT net