wrapper function for ellipsis arg taking functions.

hi,

how to write a wrapper function (NOT macro) for printf() like
functions.
i want to write a wrapper for printf(),i am stuck at "how to pass
variable args to the printf() from the wrapper function. I know how to
do it with macros. But i want this to be done using wrapper as a
function.
Anyone please shed some light.

thanks

sinbad

On Nov 3, 12:59*am, sinbad <sinbad.sin...@gmail.com> wrote:
> hi,
>
> how to write a wrapper function (NOT macro) for printf() like
> functions.
> i want to write a wrapper for printf(),i am stuck at "how to pass
> variable args to the printf() from the wrapper function. I know how to
> do it with macros. But i want this to be done using wrapper as a
> function.


You can't exactly. But if you have a function like vprintf() instead,
which takes a va_list instead of a "...", you can do something like:

int myprintf(char *fmt, ...)
{
va_list pl;
int r;
va_start(pl, fmt);
r = vprintf(fmt, ap);
va_end(pl);
return r;
}

robertwessel2@yahoo.com

On Nov 3, 1:49*am, "robertwess...@yahoo.com" <robertwess...@yahoo.com>
wrote:
> On Nov 3, 12:59*am, sinbad <sinbad.sin...@gmail.com> wrote:
>
> > hi,
>
> > how to write a wrapper function (NOT macro) for printf() like
> > functions.
> > i want to write a wrapper for printf(),i am stuck at "how to pass
> > variable args to the printf() from the wrapper function. I know how to
> > do it with macros. But i want this to be done using wrapper as a
> > function.
>
> You can't exactly. *But if you have a function like vprintf() instead,
> which takes a va_list instead of a "...", you can do something like:
>
> int myprintf(char *fmt, ...)
> {
> * *va_list pl;
> * *int r;
> * *va_start(pl, fmt);
> * *r = vprintf(fmt, ap);
> * *va_end(pl);
> * *return r;
>
>
>
> }


And obviously the call in the middle of that was supposed to be:

r = vprintf(fmt, pl);

robertwessel2@yahoo.com

On 2009-11-03, sinbad <> wrote:
> hi,
>
> how to write a wrapper function (NOT macro) for printf() like
> functions.
> i want to write a wrapper for printf(),i am stuck at "how to pass
> variable args to the printf() from the wrapper function. I know how to
> do it with macros. But i want this to be done using wrapper as a
> function.
> Anyone please shed some light.

vprintf()

-s
--
Copyright 2009, all wrongs reversed. Peter Seebach / usenet-
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!

Seebs

sinbad wrote:
> hi,
>
> how to write a wrapper function (NOT macro) for printf() like
> functions.
> i want to write a wrapper for printf(),i am stuck at "how to pass
> variable args to the printf() from the wrapper function. I know how to
> do it with macros. But i want this to be done using wrapper as a
> function.
> Anyone please shed some light.

I'm sure this is in the comp.lang.c FAQ at http://f-faq.com/ but, in any
case, look up vprintf.
--
Flash Gordon

Flash Gordon

Richard Heathfield wrote:
> In <>, Flash Gordon wrote:
>
>> sinbad wrote:
>>> hi,
>>>
>>> how to write a wrapper function (NOT macro) for printf() like
>>> functions.
>>> i want to write a wrapper for printf(),i am stuck at "how to pass
>>> variable args to the printf() from the wrapper function. I know how
>>> to do it with macros. But i want this to be done using wrapper as a
>>> function.
>>> Anyone please shed some light.
>> I'm sure this is in the comp.lang.c FAQ at http://f-faq.com/ but, in
>> any case, look up vprintf.
>
> Today seems to be typo day. The FAQ is at http://c-faq.com/

Every day is typo day! You are, of course, correct.
--
Flash Gordon

Flash Gordon