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From: cs106132@umbc5.umbc.edu (cs106132)
Newsgroups: comp.lang.c
Subject: movedata ()  recoded in 80x86 assembly
Message-ID: <5024@umbc3.UMBC.EDU>
Date: 14 Feb 91 22:15:54 GMT
Sender: newspost@umbc3.UMBC.EDU
Reply-To: cs106132@umbc5.umbc.edu (cs106132)
Distribution: usa
Organization: University of Maryland, Baltimore County
Lines: 35


   Hi,
I was wondering if anyone out there show me an example of coding a
routine that will do the equivalent of Turbo C's "movedata()" function.
In other words, a routine that will copy  a block of memory from any
segment:offset to any segment:offset.  The important thing is that it does not
use any interrupt calls.  I would like to see an implementation using
inline assembly capability of Turbo C.  If you have such a routine or know
where I can find one, please let me know either by e-mail or post here.


    Something like:

    void  my_movedata (unsigned src_seg, unsigned src_off,
                       unsigned dst_seg, unsigned dst_off,
                       unsigned count) {

      asm  push es
      asm  push ds
      asm  mov  ax, src_seg
      asm  mov  es, 
      asm  mov  si, src_off
      asm  mov  ax, dst_seg
      asm  mov  ds, ax
      asm  mov  di, dst_off
      asm  mov  cx, count/2
      asm  cld
      asm  rep movsw
    }


  I am not really familiar with the assemler, so any help will be appreciated.

Regards,
Tark