vprintf, vfprintf, vsprintf, and vsnprintf : vprintf vfprintf vsprintf vsnprintf « stdio.h « C Tutorial

1. C Tutorial
2. stdio.h
3. vprintf vfprintf vsprintf vsnprintf

The functions vprintf(), vfprintf(), vsprintf(), and vsnprintf() are functionally equivalent to printf(), fprintf(), sprintf(), and snprintf(), respectively , except that the argument list has been replaced by a pointer to a list of arguments.

This pointer must be of type va_list, which is defined in the header .

#include <stdio.h>
  #include <stdarg.h>

  void print_message(char *format, ...)
  {
    va_list ptr;

    va_start(ptr, format);

    vprintf(format, ptr);

    va_end(ptr);
  }

  int main(void)
  {
    print_message("Cannot open file %s.", "test");

    return 0;
  }