From: Matthias Skobowsky <skymac AT cs DOT tu-berlin DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Assembly in Libraries
Date: Wed, 05 May 1999 01:13:31 +0200
Organization: Technische Universitaet Berlin, Deutschland
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,
 I got a nice library and a nice program, but the library is written
using Borlands Inline Assembly. So I went to the news group and read a
lot of mails concerning assembly. I looked at the FAQ chapter 17 and
tried to change it to the AT&T syntax. After some trying there were no
more syntax errors but a general protection fault. That's why I'm asking
some questions: 

1. Is it possible to use those assembly a library? (In my \include are
only constructions like __asm__ __volatile__("...))

2.What about the header? Will it work with DJ C? 

3. Does anybody has experiences in changing Borland to AT&T?

Thanks, Matthias 

/***********************Something of the header**********/
#if!defined(__STRING_H) 
#include <string.h> 
#endif

#define VIDEO          0x10

/********Think it's like Intel (from the Borland
Code)*****************************/
void writetovideo(int len, int code, int color) {

    int address = ((wherex() - 1) * 2) + ((wherey() -1) * 160);
    int videoSeg = videoAddress();   /* Is a colour card on system? */

    asm {
    mov   ah, BYTE PTR color
    mov   al, BYTE PTR code      /* The character to display      */
    mov   cx, WORD PTR len       /* cx determines number of loops */
    mov   dx, WORD PTR videoSeg
    push  es
    mov   es, dx
    mov   di, WORD PTR address
    rep   stosw
    pop   es
    }
}


/********Tried to change to AT&T*****************************/
void writetovideo(int len, int code, int color) {

    int address = ((wherex() - 1) * 2) + ((wherey() -1) * 160);
    int videoSeg = videoAddress();   /* Is a colour card on system? */

    asm("movb color, %ah");
    asm("movb code, %al");
    asm("movw len, %cx");
    asm("move videoSeg, %es");
    asm("push %es");
    asm("mov? %dx, %es");        /*What about the length by registers
    asm("movw adress, %di");
    asm("rep stosw");
    asm("pop %es");
}