Mail Archives: djgpp/1997/01/04/02:51:42
From: | lonniem AT nol DOT net
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | Re: Memory management in DJGPP
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Date: | Sat, 04 Jan 1997 08:01:07 GMT
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Organization: | Networks On-Line
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Lines: | 56
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Message-ID: | <5akrpc$297$1@news.nol.net>
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References: | <5ahrj3$crt$1 AT news DOT utdallas DOT edu>
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NNTP-Posting-Host: | ip39-14.nol.net
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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rbrooks AT utdallas DOT edu (Rusty L Brooks) wrote:
>I have a few questions about djgpp... since I am learning C++ from a
>different C++ book, there is some difficulty...
>First of all, gcc doesn't seem to handle the keyword far, as in:
>char far *harf;
>This was mentioned in the info libc.a help files... How can I maintain a
>similar functionality?
>Secondly, if I want to pass a memory value to a pointer, how do I go about
>doing this? (Both for far pointers and near pointer) I get a warning
>about casting harf (see above) to an int without a cast if I try something
>like:
>char *harf = 0x0013 or something similar.
>Email replies appreciated, but I *do* read the group, so posting here is
>ok too.
Well for your casting woes try some code like this:
char *harf = (char *) 0x0013;
But I don't think this is what you want. This sets the ptr to point
to the address 0x0013 and does not make that the value being pointed
to. Try this:
char *harf = malloc (1);
*harf = 0x13;
If this is not what you want well then I don't know what you do want.
This sets the value being pointed to to 0x13.
Also if you want to copy some code straight from a book that uses
far/near pointers do this:
#define far
#define near
This will take away the error messages but is not very good code. You
don't need he whole far/near thing. It's was a kludge built into
16-bit code at a time when 64KB for code and 64KB for data was
considered forward thinking. So just change this:
char far* ptr; /* I've forgotten how to use the far keyword,
Is this correct? */
into
char* ptr;
Lonnie McCullough
lonniem AT mail DOT utexas DOT edu
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