extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args)
__attribute__ ((__format__ (__printf__, 3, 0)));
extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args)
__attribute__ ((__format__ (__printf__, 3, 0)));