From: Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Bytes and words
Date: Sun, 08 Feb 1998 22:42:50 +0100
Organization: Lehrstuhl fuer Stroemungsmechanik
Lines: 39
Message-ID: <34DE26DA.B50A1030@LSTM.Ruhr-UNI-Bochum.De>
References: <34DD3806 DOT 92C44AF4 AT ea DOT oac DOT uci DOT edu> <34DD4AF1 DOT E35F1A26 AT bethany DOT edu>
NNTP-Posting-Host: bvb.lstm.ruhr-uni-bochum.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

pneyz wrote:
> 
> >   If I try to include this in a simple program, gcc complains about the
> > use of semicolons in a structure and (it seems) about the use of
> > 'BYTE'.  Is the above just meant to be a very formal looking piece of
> > pseudocode, or can one actually declare bytes and words (2 bytes?) in
> > this manner?
> 
> BYTE and WORD are not defined be default, so most coders put something
> like:
> 
>   typedef unsigned char byte;
>   typedef unsigned int  word;
> 
> In their code for gfx routines. However, in DJGPP, an int is 4 bytes by
> default, so you should change the int to a short. byte and word are not
> C identifiers, but are holdovers from asm (I think).
Additionally you may have to put a 
#pragma pack(1)
before and a 
#pragma pack()
after the struct definition, because otherwise gcc will align
struct members to d(?)word boundaries. I am pretty, but not completely,
sure that a TGA header is packed with no spare space between members.

-- 
Ciao
Tom

*************************************************************
* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
* Universitaetsstr. 150                                     *
* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
* Fax: +49 234 709 4162                                     *
* http://www.lstm.ruhr-uni-bochum.de/~demmer                *
*************************************************************