int sprintf_f(char *s, const char FRMWR_MEM *format, ...) /* Our main entry */
{
va_list ap;
int nr_of_chars;

va_start(ap, format); /* Variable argument begin */
nr_of_chars = _formatted_write_f(format, put_c_in_string_f, (void *) &s, ap);
va_end(ap); /* Variable argument end */
*s = '\0'; /* String should be terminated with NUL */
return nr_of_chars; /* According to ANSI */
}