Path: ...!news.nobody.at!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Richard Harnden <richard.nospam@gmail.invalid>
Newsgroups: comp.lang.c
Subject: Re: is it possible to have functions with 0, 1, or 2 args?
Date: Mon, 12 Aug 2024 09:33:25 +0100
Organization: A noiseless patient Spider
Lines: 19
Message-ID: <v9chcl$37e8f$1@dont-email.me>
References: <7q-dnbTDU4oBES37nZ2dnZfqnPednZ2d@brightview.co.uk>
 <20240805151946.00000bce@yahoo.com> <86wmkmfhaz.fsf@linuxsc.com>
Reply-To: nospam.harnden@invalid.com
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Mon, 12 Aug 2024 10:33:26 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="fcbfd9e721c704ecbeb500d57126c718";
	logging-data="3389711"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX19fyz78f2znXuF+f46wNSxECVH6a6tg14w="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:bfEnpmtRY74SE+VsMMJI91aqKrI=
In-Reply-To: <86wmkmfhaz.fsf@linuxsc.com>
Content-Language: en-GB
Bytes: 1965

On 12/08/2024 06:20, Tim Rentsch wrote:
> Michael S <already5chosen@yahoo.com> writes:
> 
>> On Mon, 05 Aug 2024 08:26:04 +0000
>> Mark Summerfield <mark@qtrac.eu> wrote:
>>
>> According to my understanding, vararg functions without arguments will
>> become possible in C23.  But since fully functional C23 compilers do not
>> exist yet, right now the answer to your question is "No".
> 
> Even in C99 varargs functions can be called without arguments.
> The question here is more subtle.  In fact it is possible even
> in C99 and C11 to do what he wants, but it isn't easy, and it
> is far from obvious how to go about it.  Still, if the question
> is "can this be done?", the answer is Yes even now.

How does va_start know where to, um, start from if there's no last named 
argument?