(newsgroups list severely trimmed. Borland.* won't see our reactions,
and this kind of stuff can be found in so many faqs that I won't bother
c.l.c with it)
On 2007-08-05, dhruba.bandopadhyay@[EMAIL PROTECTED]
> wrote:
> Am using Borland C++ 4.5 for the old dos.h APIs. It appears that newer
> versions of compilers stop support for the oldskool DOS routines. Am
> trying to convert/port an oldskool Pascal program that uses registers/
> interrupts into C/C++.
>
>
> 1. What are the inline($FA); & inline($FB); Pascal functions? What is
> the C/C++ equivalent?
> inline($CD / $1C);
> inline($9C);
inline just inlines the bytes in the code stream. IOW they are pure
machinecode in hex. Probably STI/CLI or so.
Just put them as
db $FA,$FB,$CD,$1C,$9C
in the code segment in some assembler, and then disassemble the assembled
result.
> 2. Just checking if this is correct Pascal-to-C conversion:
The first ones look correct.
> s = seg(dat);//Pascal
> s = (unsigned int)dat & 0xFFFF0000;//C
>
> o = ofs(dat);//Pascal
> o = (unsigned int)dat & 0x0000FFFF;//C
There is no universal translation for these. They all depend on memory
models and what you want to do with the result.
> port[0x40] = lo(count);//Pascal
> outp( 0x40, lo(count) );//C
>
> port[0x40] = hi(count);//Pascal
> outp( 0x40, hi(count) );//C
Count must be a 16-bit type.
> 3. dos.h contains a bunch of register structures.
> 4. How can I reverse the bits of a byte or word?
I don't know the relevant C functions of this, so can't answer this.
I seriously wonder why this is worth the trouble btw, 16-bits dos being
pretty dead.
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