From: "Brent Ritchie" <britchieb212 AT rogers DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <lwV29.271637$WJf1 DOT 95757 AT news01 DOT bloor DOT is DOT net DOT cable DOT rogers DOT com> <1028401071 DOT 374940 AT queeg DOT ludd DOT luth DOT se>
Subject: Re: Writing text to screen
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Date: Sat, 03 Aug 2002 19:29:38 GMT
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To: djgpp AT delorie DOT com
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"Martin Str|mberg" <ams AT speedy DOT ludd DOT luth DOT se> wrote in message
news:1028401071 DOT 374940 AT queeg DOT ludd DOT luth DOT se...
> Brent Ritchie <britchieb212 AT rogers DOT com> wrote:
> :     I just wanted to know how do I write text to the screen without
using
> : "cout". I am writing a Command line for my new OS and I don't want to
> : re-write the C++ standard library just yet. My OS runs in protected mode
so
>
> printf()? Then you just have to rewrite the C library.

    I could but I'm not that good. I've only been using C++ for about 3
years and I don't exactly understand how the libraries work. I'm used to
being protected from all the low level stuff.

Actually you
> could pick some of the best parts from libc (if you ever intend to
> distribute your OS then you must distibute it under the GPL if you do
> this).
>
> : I'll have to use the video memory directly. Any help appreciated.
>
> Otherwise check out _farpokew()?
    I came across the following code:

/* note this example will always write to the top
    line of the screen */
 void writeString(int colour, char *string)
 {
  char *video=(char*)0xB8000;
  while(*string!=0)
  {
   *video=*string;
   string++;
   video++;
   *video=colour;
   video++;
  }
 }

But I can't get it to work, It just crashes. Anyone know how? I'm going to
start porting parts of the C++ standard library next month hopefully. I want
to try and rewrite part of in in assembler so I can get it to run as fast as
possible.

Thanks.

--
BROS

http://members.rogers.com/britchieb212/
>
>
> Right,
>
> MartinS