C implementation of Generic For?

["King, Mike" <MKing@...>]

How would one write the following Lua code using the Lua C interface?  I have written a function that behaves like ipairs and pairs.  I would like to use it from the C interface but I'm not sure how to accomplish it.

### Lua ###

for a,b in func() do
   print(a,b)
end

### C ###

// is this the equivalent code?

lua_getglobal(L, "func");
lua_call(L, 0, 3);
for (;;) {
   lua_pushvalue(L, -3);
   lua_pushvalue(L, -3);
   lua_pushvalue(L, -3);
   lua_call(L, 2, 1);
   if (lua_isnil(L, -1)) break;
   lua_getglobal(L, "print");
   lua_insert(L, lua_gettop(L)-2);
   lua_call(L, 2, 0);
}

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