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From: tkacik@kyzyl.mi.org (Tom Tkacik)
Newsgroups: comp.lang.c
Subject: Re: Will it execute everywhere ?
Message-ID: <229@kyzyl.mi.org>
Date: 29 Jul 90 15:00:42 GMT
References: <831@gtenmc.UUCP>
Distribution: na
Organization: Somewhere in Royal Oak, MI
Lines: 27


In article <831@gtenmc.UUCP>, csp@gtenmc.UUCP (Charudutta S. Palkar) writes:
> 	Will this piece of code execute irrespective of the order
> 	in which the parameters are pushed on the stack ie. right
> 	to left or left to right? This is executable on Unix V.3
> 	on a VAX-8000.
 
> 	void ftest(n)
> 	int n;
> 	{
> 	   char **p;
> 	   p = (char **)( &n + 1 );
> 	   while( n-- )
> 	      printf("%s",*p++);
> 	}


This is not portable.  It requires that the stack grow down.
Some machines (eg. AT&T WE32000, used in 3b2's) have a stack that grows up.
Others pass the first few parameters in registers.

To be portable, use varargs.


-- 
Tom Tkacik		tkacik@kyzyl.mi.org
Speaking only for myself here in Royal Oak.