global variables starting with '.' are protected in Lua (temporarily at

least...)

1 files changed, 13 insertions, 3 deletions

diff --git a/lbuiltin.c b/lbuiltin.c
index 589e591b..53dd4032 100644
--- a/lbuiltin.c
+++ b/lbuiltin.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.9 1997/11/26 18:53:45 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.10 1997/11/26 19:40:27 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -217,19 +217,29 @@ static void luaI_assert (void)
 }
 
 
+static void check_globalname (char *n)
+{
+  if (n[0] == '.')
+    luaL_verror("cannot change variable `%.50s' (starts with `.')", n);
+}
+
 static void setglobal (void)
 {
+  char *n = luaL_check_string(1);
   lua_Object value = luaL_nonnullarg(2);
+  check_globalname(n);
   lua_pushobject(value);
-  lua_setglobal(luaL_check_string(1));
+  lua_setglobal(n);
   lua_pushobject(value);  /* return given value */
 }
 
 static void rawsetglobal (void)
 {
+  char *n = luaL_check_string(1);
   lua_Object value = luaL_nonnullarg(2);
+  check_globalname(n);
   lua_pushobject(value);
-  lua_rawsetglobal(luaL_check_string(1));
+  lua_rawsetglobal(n);
   lua_pushobject(value);  /* return given value */
 }