va_copy

[P.Phant]

Hi, I'd like to know if this will do what I expect on all platforms (standard C99):

void foo1(va_list arguments)
{
    va_list arg_copy;    
    va_copy(arg_copy,arguments);
    
    ...    some code using va_arg on arg_copy and not on arguments ...
   
    va_end(arg_copy);
}

void foo2(va_list arguments)
{
    va_list arg_copy;     
    va_copy(arg_copy,arguments);

     ...    some code using va_arg on arg_copy and not on arguments ....

    va_end(arg_copy);
}

void foo(int count, ...)
{
   va_list arguments;
   va_start(arguments,count);
   foo1(arguments);
   foo2(arguments);
   va_end(arguments);
}

Of course what I expect is "arguments" not to be corrupted when it is passed to foo2. I suppose it is OK or else there is a serious problem with the name of this macro, but you never know .

None of the exemples about va_copy I found treat this particular point, which made me wonder if there is a better way to do it. And considering that I didn't find much information about the various implementation of the va_list type and the va_arg macro, except that there are precisly various ones, that do not always get along with assignations and such (array of pointers of length 1 I think for example) I am rather unsure of this code.

Thanks.
EDIT: sorry about the incorrect code, shouldn't try to learn 3 different things at the same time .