+va_start(ap, format);
+smtp_vprintf(format, ap);
+va_end(ap);
+}
+
+/* This is split off so that verify.c:respond_printf() can, in effect, call
+smtp_printf(), bearing in mind that in C a vararg function can't directly
+call another vararg function, only a function which accepts a va_list.
+
+Note also that repeated calls to va_start()/va_end() pairs is claimed to be
+non-portable; meanwhile, va_copy() is also non-portable in that it's C99, so
+we end up needing OS support to define it for us. */
+
+void
+smtp_vprintf(char *format, va_list ap)
+{
+va_list ap_d;
+