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From: flaps@utcs.UUCP
Newsgroups: net.unix,net.unix-wizards,net.arch,net.lang.c
Subject: Re: get size of malloc'd object
Message-ID: <1986Jun27.01:36:11.4839@utcs.uucp>
Date: Fri, 27-Jun-86 01:36:11 EDT
Article-I.D.: utcs.1986Jun27.01:36:11.4839
Posted: Fri Jun 27 01:36:11 1986
Date-Received: Fri, 27-Jun-86 01:39:01 EDT
References: <165@daisy.UUCP> <334@valid.UUCP> <2206@peora.UUCP> <2081@umcp-cs.UUCP> <2216@peora.UUCP>
Reply-To: flaps@utcs.UUCP (Alan J Rosenthal)
Organization: University of Toronto
Lines: 25
Xref: utcs net.unix:8357 net.unix-wizards:17930 net.arch:3543 net.lang.c:9410


A way to get a sufficient alignment constant should be as follows:

union ALIGNED {
	char garbage0;
	unsigned char garbage1;
	short garbage2;
	int garbage3;
	unsigned garbage4;
	long garbage5;
	unsigned long garbage6;
	float garbage7;
	double garbage8;
};

(sorry if I've left out any)

Then you can use sizeof(ALIGNED) as the alignment constant.  Am I mistaken?
The problem is that this number might be greater than the actual
alignment constant, for example if a "double" has length 8 but only
needs quad-word alignment.

--
Alan J Rosenthal
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