lshal --vintf to create a skeleton hal manifest.
Run it as follows:
lshal --init-vintf=/data/a.xml
lshal --init-vintf > /data/a.xml
Test: lshal --init-vintf with and without path argument
Bug: 35852743
Change-Id: Ief9385fc2764a487d1a70644699e01133bdc8a8e
diff --git a/cmds/lshal/NullableOStream.h b/cmds/lshal/NullableOStream.h
new file mode 100644
index 0000000..ab37a04
--- /dev/null
+++ b/cmds/lshal/NullableOStream.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef FRAMEWORK_NATIVE_CMDS_LSHAL_NULLABLE_O_STREAM_H_
+#define FRAMEWORK_NATIVE_CMDS_LSHAL_NULLABLE_O_STREAM_H_
+
+#include <iostream>
+
+namespace android {
+namespace lshal {
+
+template<typename S>
+class NullableOStream {
+public:
+ NullableOStream(S &os) : mOs(&os) {}
+ NullableOStream(S *os) : mOs(os) {}
+ NullableOStream &operator=(S &os) {
+ mOs = &os;
+ return *this;
+ }
+ NullableOStream &operator=(S *os) {
+ mOs = os;
+ return *this;
+ }
+ template<typename Other>
+ NullableOStream &operator=(const NullableOStream<Other> &other) {
+ mOs = other.mOs;
+ return *this;
+ }
+
+ const NullableOStream &operator<<(std::ostream& (*pf)(std::ostream&)) const {
+ if (mOs) {
+ (*mOs) << pf;
+ }
+ return *this;
+ }
+ template<typename T>
+ const NullableOStream &operator<<(const T &rhs) const {
+ if (mOs) {
+ (*mOs) << rhs;
+ }
+ return *this;
+ }
+ S& buf() const {
+ return *mOs;
+ }
+ operator bool() const {
+ return mOs != nullptr;
+ }
+private:
+ template<typename>
+ friend class NullableOStream;
+
+ S *mOs = nullptr;
+};
+
+} // namespace lshal
+} // namespace android
+
+#endif // FRAMEWORK_NATIVE_CMDS_LSHAL_NULLABLE_O_STREAM_H_