cvs.gedasymbols.org/archives/browse.cgi | search |
From: | "Damian Yerrick" <web DOT poison AT pineight DOT 8m DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: problem with far pointers |
Date: | Wed, 29 Sep 1999 17:30:39 -0500 |
Organization: | Rose-Hulman Institute of Technology |
Lines: | 39 |
Message-ID: | <7su41v$a4q$1@solomon.cs.rose-hulman.edu> |
References: | <7ssgdl$pg AT cs DOT vu DOT nl> <7sssfq$rds AT acp3bf DOT knirsch DOT de> |
NNTP-Posting-Host: | 137.112.205.146 |
X-Trace: | solomon.cs.rose-hulman.edu 938644351 10394 137.112.205.146 (29 Sep 1999 22:32:31 GMT) |
X-Complaints-To: | news AT cs DOT rose-hulman DOT edu |
NNTP-Posting-Date: | 29 Sep 1999 22:32:31 GMT |
X-Priority: | 3 |
X-MSMail-Priority: | Normal |
X-Newsreader: | Microsoft Outlook Express 5.00.2314.1300 |
X-MimeOLE: | Produced By Microsoft MimeOLE V5.00.2314.1300 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
FokkemaDBRA has a selector that points to video RAM. S/he wants to access video RAM as if it were an array. In Borland C++, this worked: > > int far *pointer; Hans-Bernhard Broeker <broeker AT acp3bf DOT knirsch DOT de> responded: > There is no such thing as a 'far pointer' in DJGPP. But there are specialised > functions (inline assembly, so they should be fast enough for just about > every application you can come up with), conveniently called the 'far pointer > functions'. Look up > > farpokeb() > farpeekb() > movedata() Shouldn't movedata() be called farmemmove() or farmemcpy()? > The one thing you won't get using these functions is use of > the 'standard' syntax, like 'video_mem[position] = content;'. Maybe someone could put true far pointer support (a la Borland) into DJGPP. > If you insist on that, you must effectively disable > memory protection using the 'near pointer method'. And risk overwriting other programs in memory (such as Windows, DOS, etc.). Overwriting DOS is a Bad Thing. > See the FAQ for more details about all of this. > -- > Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de) > Even if all the snow were burnt, ashes would remain.
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |