vsprintf

   Prints formatted output based on an argument list.

   This function is the same as the sprintf function except that
   instead of being called with a variable number of arguments, it
   is called with an argument list that has been initialized by va_
   start (and possibly with subsequent va_arg calls).

   Format

     #include  <stdio.h>

     int vsprintf  (char *str, const char *format, va_list ap);
 

Additional information available:

Arguments       Return_Value