Forward an invocation of a variadic function in C

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If you don’t have a function analogous to vfprintf that takes a va_list instead of a variable number of arguments, you can’t do it. See http://c-faq.com/varargs/handoff.html.

Example:

void myfun(const char *fmt, va_list argp) {
    vfprintf(stderr, fmt, argp);
}

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