va_list - variable argument list

       Used  by  functions  with  a  varying number of arguments of varying types.  The function must declare an
       object of type va_list which is used by the macros va_start(3), va_arg(3), va_copy(3), and  va_end(3)  to
       traverse the list of arguments.

       C89, POSIX.1-2001.

       Standard C library (libc)

       va_list - variable argument list

       The following headers also provide va_list: <stdio.h> and <wchar.h>.

va_start(3), va_arg(3), va_copy(3), va_end(3)

Linux man-pages 6.9.1                              2024-05-02                                     va_list(3type)

       C11, POSIX.1-2008.

#include<stdarg.h>typedef /* ... */  va_list;