Initialization of variable for scanning argument list

[Classification]

Standard library

[Syntax]

#include <stdarg.h>

typedef char __near *va_list;

void va_start(va_list ap, last-named-argument);

[Description]

This function initializes variable ap so that it indicates the beginning (argument next to last-named-argument) of the list of the variable arguments.

To define function func having a variable arguments in a portable form, the following format is used.

#include    <stdarg.h>

void func(arg-declarations, ...) {

        va_list ap;

        type    argN;

        va_start(ap, last-named-argument);

        argN = va_arg(ap, type);

        va_end(ap);

}