lua: add lua 5.2 compatibility changes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/lua/uci.c b/lua/uci.c
index 638290076b391514610b14647f6caf3a9afb9443..8ace746eabf0dc22f751154e2b08b634b47b8d66 100644 (file)
--- a/lua/uci.c
+++ b/lua/uci.c
@@ -34,6 +34,28 @@
 #define DPRINTF(...) do {} while (0)
 #endif
 
+#if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
+
+/*
+ * ** Adapted from Lua 5.2.0
+ * */
+static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+       luaL_checkstack(L, nup+1, "too many upvalues");
+       for (; l->name != NULL; l++) {  /* fill the table with given functions */
+               int i;
+               lua_pushstring(L, l->name);
+               for (i = 0; i < nup; i++)  /* copy upvalues to the top */
+                       lua_pushvalue(L, -(nup+1));
+               lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
+               lua_settable(L, -(nup + 3));
+       }
+       lua_pop(L, nup);  /* remove upvalues */
+}
+
+#define lua_rawlen(L, i) lua_objlen(L, i)
+
+#endif
+
 static struct uci_context *global_ctx = NULL;
 
 static struct uci_context *
@@ -566,7 +588,7 @@ uci_lua_set(lua_State *L)
        case 4:
                /* Format: uci.set("p", "s", "o", "v") */
                if (lua_istable(L, nargs)) {
-                       if (lua_objlen(L, nargs) < 1)
+                       if (lua_rawlen(L, nargs) < 1)
                                return luaL_error(L, "Cannot set an uci option to an empty table value");
                        lua_rawgeti(L, nargs, 1);
                        ptr.value = luaL_checkstring(L, -1);
@@ -596,7 +618,7 @@ uci_lua_set(lua_State *L)
        }
 
        if (istable) {
-               if (lua_objlen(L, nargs) == 1) {
+               if (lua_rawlen(L, nargs) == 1) {
                        i = 1;
                        if (ptr.o) {
                                v = ptr.value;
@@ -613,7 +635,7 @@ uci_lua_set(lua_State *L)
                                goto error;
                }
 
-               for (; i <= lua_objlen(L, nargs); i++) {
+               for (; i <= lua_rawlen(L, nargs); i++) {
                        lua_rawgeti(L, nargs, i);
                        ptr.value = luaL_checkstring(L, -1);
                        err = uci_add_list(ctx, &ptr);
@@ -753,7 +775,7 @@ uci_lua_add_change(lua_State *L, struct uci_element *e)
                         * list_add, append this value to table */
                        } else {
                                lua_pushstring(L, value);
-                               lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
+                               lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
                        }
 
                /* non-list change, simply set/replace field */
@@ -967,11 +989,13 @@ luaopen_uci(lua_State *L)
        lua_setfield(L, -2, "__index");
 
        /* fill metatable */
-       luaL_register(L, NULL, uci);
+       luaL_setfuncs(L, uci, 0);
        lua_pop(L, 1);
 
        /* create module */
-       luaL_register(L, MODNAME, uci);
+       lua_newtable(L);
+       luaL_setfuncs(L, uci, 0);
+       lua_setglobal(L, MODNAME);
 
        return 0;
 }