wrapper function for ellipsis arg taking functions.

[sinbad]

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

 

[robertwessel2]

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]

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);

 

[Seebs]

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

 

[Flash Gordon]

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]

Today seems to be typo day. The FAQ is at http://c-faq.com/

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