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.
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