more functions exported.

lualib.h

@@ -2,7 +2,7 @@
 ** Libraries to be used in LUA programs
 ** Grupo de Tecnologia em Computacao Grafica
 ** TeCGraf - PUC-Rio
-** $Id: lualib.h,v 1.7 1996/03/14 15:53:09 roberto Exp roberto $
+** $Id: lualib.h,v 1.8 1996/04/30 21:13:55 roberto Exp roberto $
 */
 
 #ifndef lualib_h
@@ -23,9 +23,11 @@ struct lua_reg {
 };
 
 void luaI_openlib (struct lua_reg *l, int n);
-void lua_arg_error(char *funcname);
+void lua_arg_check(int cond, char *funcname);
 char *lua_check_string (int numArg, char *funcname);
+char *lua_opt_string (int numArg, char *def, char *funcname);
 double lua_check_number (int numArg, char *funcname);
+long lua_opt_number (int numArg, long def, char *funcname);
 char *luaI_addchar (int c);
 void luaI_addquoted (char *s);