libc.info: Arglists

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Variable Argument Lists

   The `printf' family of functions is defined to accept a variable
number of arguments, rather than a fixed argument list.  You can define
your own functions with a variable argument list, by using macro
definitions from either `stdarg.h' (for compatibility with ANSI C) or
from `varargs.h' (for compatibility with a popular convention prior to
ANSI C).