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 vsprintf()              Write Formatted Data to String

 #include   <stdio.h>
 #include   <stdarg.h>                  Use for ANSI C standard compatibility

 int        vsprintf(buffer,format-string,arg-ptr);
 char       *buffer;                     Storage location for output
 const char *format-string;              Format control
 va_list    arg-ptr;                     Pointer to list of arguments

    vsprintf() formats and prints a series of characters and values to
    'buffer'.  It is like sprintf(), but accepts a pointer to a list of
    arguments rather than a list of arguments.

    'arg-ptr' has the type 'va_list'.  It is defined in <stdarg.h>
    (required for compatibility with proposed ANSI C standard).
    'arg-ptr' points to a list of arguments.  These arguments are
    converted and output according to specifications in 'format-string'.
    (For the inner workings of variable-length parameter lists, see
    va_start(), va_arg(), and va_end()).

    See printf() for a complete description of 'format-string'.