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Initialize variable argument list

Synopsis
#include <stdarg.h>
void va_start(va_list ap, rightmost);

Description
Use va_start to initialize the variable argument list ap, so that va_arg can extract values from it. rightmost is the name of the last explicit argument in the parameter list (the argument immediately preceding the ellipsis `...' that flags variable arguments in an ANSI C function header). You can only use va_start in a function declared using this ellipsis notation (not, for example, in one of its subfunctions).

Returns
va_start does not return a result.

Portability
ANSI C requires va_start.


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