Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!brutus.cs.uiuc.edu!apple!motcsd!xdos!doug
From: doug@xdos.UUCP (Doug Merritt)
Newsgroups: comp.sys.amiga.tech
Subject: Re: The Long Align Struct Macro D_S
Keywords: Long word align, diskInfo struct BCPL
Message-ID: <669@xdos.UUCP>
Date: 21 Feb 90 08:08:17 GMT
References: <1990Feb19.151157.21042@csmil.umich.edu>
Reply-To: doug@xdos.UUCP (Doug Merritt)
Organization: Hunter Systems, Mountain View CA (Silicon Valley)
Lines: 28

In article <1990Feb19.151157.21042@csmil.umich.edu> root@csmil.umich.edu (Zurich Operator) writes:
>-------------
>A few weeks ago somone posted a little macro that could be used in place of 
>the AllocMem() function to long align structures for use with Amigados commands
>like Examine. I lost my copy of this macro when I upgraded to Manx 5.0 
>If you have a copy or remember it, I would be most greatful. 

I don't think that was me that time (I've been posting this from time to
time for years, and I'm certainly not the only one), but here's my
version:

/*
 * RoundUp0(N,T) -- yields ceiling 1,2,...,T-1,0 (yields 0 if n % T == 0)
 * BufRound(BUF) -- given buffer address, rounds up to word boundary
 */
#define	RoundUp0(N,T)	( (T - (((ULONG) N) & (T-1)))  & (T-1))
#define	BufRound(BUF)	&BUF[ RoundUp0(BUF,4) ]

	/* example usage: */
	char buf[ sizeof(struct FileInfoBlock) + 4];

	ptr = (struct FileInfoBlock *) BufRound(buf);

---------------------- End of A.F. Drill :-) --------------------------
Doug
-- 
Doug Merritt		{pyramid,apple}!xdos!doug
Member, Crusaders for a Better Tomorrow		Professional Wildeyed Visionary