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Traditional
macros (varargs.h)
If your
C compiler predates requirements set by ANSI standards for 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.