#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
.