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From: chris@mimsy.umd.edu (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: ANSI C stdarg questions
Keywords: stdarg ANSI C
Message-ID: <21387@mimsy.umd.edu>
Date: 21 Dec 89 09:39:08 GMT
References: <8217@pixar.UUCP>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 20

In article <8217@pixar.UUCP> rta@pixar.UUCP (Rick Ace) writes:
>1)  Is it legal ANSI C for test() to pass the argument "ap" to
>    print1() and print2() as it does in the above program [deleted]?

Yes.  Unfortunately, it is not legal afterwards to do more with `ap'
in test().

>2)  Is it legal ANSI C to traverse the argument list multiple times?
>[using va_start + series of va_arg + va_end + va_start + va_arg + va_end]

Yes, this is explicitly allowed.

As you noted, the only real problem is the obnoxious (and completely
unnecessary, since the `...' syntax must be recognised by the compiler
and therefore compilers could recognise some other hidden syntax for
va_start's expansion) requirement for an `anchor' (the `x' in your
`test').
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@cs.umd.edu	Path:	uunet!mimsy!chris