How can I write a function which takes a variable number of arguments and passes them to some other function (which takes a variable number of arguments)?
In general, you cannot. You must provide a version of that other function which accepts a va_list pointer, as does vfprintf in the example above. If the arguments must be passed directly as actual arguments (not indirectly through a va_list pointer) to another function which is itself variadic (for which you do not have the option of creating an alternate, va_list-accepting version) no portable solution is possible. (The problem can be solved by resorting to machine-specific assembly language.
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