/*
* Copyright (C) 2010 Wayne Meissner
*
* This file is part of jnr.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jnr.netdb;
import jnr.ffi.
Platform;
import jnr.ffi.
Pointer;
import java.util.
ArrayList;
import java.util.
Collections;
import java.util.
List;
/**
* Utility class for native strings
*/
class
StringUtil {
public static final
List<
String>
getNullTerminatedStringArray(
Pointer ptr) {
// If it is an empty list, do not allocate an empty ArrayList for it
if (
ptr == null ||
ptr.
getPointer(0) == null) {
return
Collections.
emptyList();
}
final int
pointerSize =
ptr.
getRuntime().
addressSize();
List<
String>
array = new
ArrayList<
String>();
Pointer p;
for (int
off = 0; (
p =
ptr.
getPointer(
off)) != null;
off +=
pointerSize) {
array.
add(
p.
getString(0));
}
return
array;
}
}