new implementation for udata (again they are just void *);

new implementation for the API: most operations now do not disturb
structures lua2C and C2lua.

tree.h

@@ -1,7 +1,7 @@
 /*
 ** tree.h
 ** TecCGraf - PUC-Rio
-** $Id: tree.h,v 1.16 1997/03/19 19:41:10 roberto Exp roberto $
+** $Id: tree.h,v 1.17 1997/05/14 18:38:29 roberto Exp roberto $
 */
 
 #ifndef tree_h
@@ -16,17 +16,21 @@ typedef struct TaggedString
 {
   int tag;  /* if != LUA_T_STRING, this is a userdata */
   struct TaggedString *next;
-  long size;
-  Word varindex;  /* != NOT_USED  if this is a symbol */
-  Word constindex;  /* != NOT_USED  if this is a constant */
+  union {
+    struct {
+      Word varindex;  /* != NOT_USED  if this is a symbol */
+      Word constindex;  /* != NOT_USED  if this is a constant */
+    } s;
+    void *v;  /* if this is a userdata, here is its value */
+  } u;
   unsigned long hash;  /* 0 if not initialized */
   int marked;   /* for garbage collection; never collect (nor change) if > 1 */
-  char str[1];   /* \0 byte already reserved; MAY BE NOT 0 TERMINATED!! */
+  char str[1];   /* \0 byte already reserved */
 } TaggedString;
  
 
 TaggedString *lua_createstring (char *str);
-TaggedString *luaI_createuserdata (char *buff, long size, int tag);
+TaggedString *luaI_createudata (void *udata, int tag);
 TaggedString *luaI_strcollector (long *cont);
 void luaI_strfree (TaggedString *l);
 void luaI_strcallIM (TaggedString *l);