varargs.h'
If your C compiler predates ANSI C, you may still be able to use
variable argument lists using the macros from the `varargs.h'
header file. These macros resemble their ANSI counterparts, but have
important differences in usage. In particular, since traditional C has
no declaration mechanism for variable argument lists, two additional
macros are provided simply for the purpose of defining functions with
variable argument lists.
As with `stdarg.h', the type va_list is used to hold a data
structure representing a variable argument list.
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