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ANSI-standard
macros (stdarg.h)
By ANSI
standards for C, a function has a variable number of arguments when its
parameter list ends in an ellipsis (. . .). The parameter list must also
include at least one explicitly named argument; that argument is used to
initialize the variable list data structure.
ANSI standards for C define
three macros (va_start,
va_arg,
and va_end)
to operate on variable argument lists. stdarg.h
also defines a special type to represent variable argument lists; this
type is va_list
(for usage of va_list,
see vprintf,
vfprintf,
vsprintf,
va_arg,
and va_start).