Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!dcl-cs!gdt!ccsmm
From: ccsmm@bath.ac.uk (Martin Maclaren)
Newsgroups: comp.sys.apollo
Subject: Re: gpr calling conventions (was: Re: bitmap and image conversion
Message-ID: <1990Apr10.174544.6099@bath.ac.uk>
Date: 10 Apr 90 17:45:44 GMT
References: <900409.22024335.090386@CMR.CP6>
Organization: University of Bath, England
Lines: 29

GELINASJ@CMR001.BITNET writes:
>      The calling conventions have changed -- for the better, I think--
>at SR10 to reflect the wider use of the ANSI C compiler. Since the
>"status" parameter must be set by GPR, a pointer to it must be passed
>in C. This does not explain why "&status" was not needed before...
>Maybe you can explain that if you know Pascal --hum, hum...-- the
>APOLLO Pascal that was used for a large part of the AEGIS software.
>

At SR9, the ..._$... system calls were declared as std_$call in
the /sys/ins/....ins.c files. This told the compiler that parameters
should be passed by reference to these calls - i.e. cc would no doubt
add the necessary &'s

Yes, SR10's way looks better - people porting large system call code
to SR10 must have had great fun :-)


Sorry about my previous message, I was using Pnews which was obviously
not set up to handle the way I had things.
Also, could somebody tell me the original author of bgc.pas - or
could the author get in touch? (I lost the original message.)

Should software be posted in this group? I know most of the stuff
posted here has been pretty small, but then the old stuff is not
readily available from archive sites which have comp.sources.??? etc.


Martin