-extern void xfree __PROTO((void *));
-extern void *xmalloc __PROTO((size_t));
-extern void *xrealloc __PROTO((void *, size_t));
-extern void *xcalloc __PROTO((size_t, size_t));
-extern char *xstrncpy __PROTO((char *, const char *, size_t));
-extern char *xstrdup __PROTO((const char *));
-extern char *xstrndup __PROTO((const char *, size_t));
-extern void *xmemdup __PROTO((const void *, size_t));
+extern void mdvi_free __PROTO((void *));
+extern void *mdvi_malloc __PROTO((size_t));
+extern void *mdvi_realloc __PROTO((void *, size_t));
+extern void *mdvi_calloc __PROTO((size_t, size_t));
+extern char *mdvi_strncpy __PROTO((char *, const char *, 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));