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. Ideally, you should provide a version of that other function which accepts a va_list pointer (analogous to vfprintf; see question 15.5). If the arguments must be passed directly as actual arguments, or if you do not have the option of rewriting the second function to accept a va_list (in other words, if the second, called function must accept a variable number of arguments, not a va_list), no portable solution is possible. (The problem could perhaps be solved by resorting to machine-specific assembly language; see also question 15.13.)
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