va_list

The va_list array type is defined in stdarg.h. This type holds data required by the va_arg and va_end routines. The va_list type is defined as:

typedef char *va_list;

and is used as shown in the following example:

#include <stdarg.h>

int varfunc (char *buf, int id, ...) {
  va_list tag;

  va_start (tag, id);

  if (id == 0) {
    int arg1;
    char *arg2;
    long arg3;

    arg1 = va_arg (tag, int);
    arg2 = va_arg (tag, char *);
    arg3 = va_arg (tag, long);
  }

  else {
    char *arg1;
    char *arg2;
    long arg3;

    arg1 = va_arg (tag, char *);
    arg2 = va_arg (tag, char *);
    arg3 = va_arg (tag, long);
  }

  va_end (tag);
}