Passing variable length arguements to another function.

[junk]

Hi,

Given the following function:-

void foo (char *fmt, ...) {
}

I know how to use va_start, va_end etc to process the parameters but is
there an easy way of passing the parameter list onto another function
that also has variable length arguements.

So for example given the function

void bar (char *fmt, ....) {
}

can I call bar from foo such as

void foo (char *fmt, ...) {
bar (fmt, <what goes here>);
}

Thanks
Andy

[Eric Sosman]

ju**@andy-coleman.co.uk wrote:

Hi,

Given the following function:-

void foo (char *fmt, ...) {
}

I know how to use va_start, va_end etc to process the parameters but is
there an easy way of passing the parameter list onto another function
that also has variable length arguements.

This is Question 15.12 in the comp.lang.c Frequently
Asked Questions (FAQ) list

http://www.eskimo.com/~scs/C-faq/top.html

--
Er*********@sun.com

[Krishanu Debnath]

ju**@andy-coleman.co.uk wrote:

Hi,

Given the following function:-

void foo (char *fmt, ...) {
}

I know how to use va_start, va_end etc to process the parameters but is
there an easy way of passing the parameter list onto another function
that also has variable length arguements.

So for example given the function

void bar (char *fmt, ....) {
}

can I call bar from foo such as

void foo (char *fmt, ...) {
bar (fmt, <what goes here>);
}

Thanks
Andy

No. You should call the function bar with a va_list from function foo.

Krishanu

[Kenny McCormack]

In article <cu**********@news1brm.Central.Sun.COM>,
Eric Sosman <er*********@sun.com> wrote:

ju**@andy-coleman.co.uk wrote:

Hi,

Given the following function:-

void foo (char *fmt, ...) {
}

I know how to use va_start, va_end etc to process the parameters but is
there an easy way of passing the parameter list onto another function
that also has variable length arguements.

This is Question 15.12 in the comp.lang.c Frequently
Asked Questions (FAQ) list

http://www.eskimo.com/~scs/C-faq/top.html

The short summary of which is: No. That's why the v*printf() functions
exist. I.e., you have to provide v* versions of your functions that accept
va_arg type args (rather than the usual list of args).