From:	Damian Yerrick <MYNAMEISd_yerrick AT hotmail DOT comNO2CANNEDHAM>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Inline asm translations?
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NNTP-Posting-Date:	Mon, 07 Feb 2000 17:19:23 GMT
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Date:	Mon, 07 Feb 2000 17:19:23 GMT
To:	djgpp AT delorie DOT com
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On Mon, 07 Feb 2000 14:29:00 +0100, Jan-Jaap Severs
<janjaaps AT yahoo DOT com> wrote:

>Hi people. Seems my previous msg was lost somewhere before it reached
>the newsgroup. Anyway, could someone please try and translate these two
>pieces of inline Intel asm code to AT&T inline asm code? I could really
>use those translations in trying to understand AT&T syntax. Thanx in
>advance.
>
>Here are those pieces:
>
>void FillDoubleBuffer( int color )
>{
>        asm {
>          mov cx, double_buffer_size
>          mov al, BYTE PTR color
>          mov ah, al
>          les di, double_buffer
>          rep stosw
>        }
>}

Clear screen. It's a memset() that works with real mode farpointers.

>And another one:
>
>asm {
>les di, dest_addr
>mov al, BYTE PTR color
>mov ah, al
>mov cx, xe
>sub cx, xs
>inc cx
>shr cx, 1
>rep stosw
>}

Horizontal line. Another memset().

>You might recognize them from an Andre LaMothe book...

"Black Art of 3D Game Programming"

Those are 16-bit code for memset().  Near the end of the book, it
talks about 32-bit protected mode programming and DPMI; DJGPP uses 32
bits and DPMI.  DJGPP's libc contains a 32-bit memset() that should
clear a double buffer, but I'd just use the Allegro library for the
type of thing you're trying to do.
  http://www.talula.demon.co.uk/allegro/
And Allegro has a lot of AT&T Gas-backwards assembly source for you to
peruse and reuse.

-- 
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