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Path: utzoo!watmath!watdaisy!gvcormack
From: gvcormack@watdaisy.UUCP (Gordon V. Cormack)
Newsgroups: net.lang.c
Subject: Re: number of arguments function for 4.1bsd VAX cc(1) -- TYPO FIX
Message-ID: <7005@watdaisy.UUCP>
Date: Sun, 24-Feb-85 11:57:59 EST
Article-I.D.: watdaisy.7005
Posted: Sun Feb 24 11:57:59 1985
Date-Received: Wed, 27-Feb-85 04:06:00 EST
References: <oliveb.269> <271@oliveb.UUCP>
Organization: U of Waterloo, Ontario
Lines: 25

This sample program illlustrates a much simpler way to find the
number of arguments to a function on the VAX, and to access an
indeterminate number of arguments.  

    #include <stdio.h>

    main()
    {
	pr_args(1);
	pr_args(1, 2, 3);
	pr_args(1, 2, 3, 4);
    }
    pr_args(args)
	int args;
    {
	int nargs, *argp, i;
	argp = &args;
	nargs = argp[-1];
	printf("Called with %d args: ", nargs);
	for(i=0; i<nargs; i++) printf( "%d ", argp[i] );
	putchar('\n');
    }
-- 
Gordon V. Cormack      CS Department, University of Waterloo
   gvcormack@watdaisy.uucp     gvcormack%watdaisy@waterloo.csnet