extern char *mdvi_strdup __PROTO((const char *));
extern char *mdvi_strndup __PROTO((const char *, size_t));
extern void *mdvi_memdup __PROTO((const void *, size_t));
extern char *mdvi_strdup __PROTO((const char *));
extern char *mdvi_strndup __PROTO((const char *, size_t));
extern void *mdvi_memdup __PROTO((const void *, size_t));