Move DumpWriter to libnetdutils
resolver related component in libnetd_resolv
needs it to easily print dump log.
Bug: 122564854
Test: built, flashed, booted
system/netd/tests/runtests.sh pass
adb shell dumpsys netd, worked fine
Change-Id: Ic97d5f21b738fc3074e9308f4846191e744ed479
diff --git a/libnetdutils/include/netdutils/DumpWriter.h b/libnetdutils/include/netdutils/DumpWriter.h
new file mode 100644
index 0000000..a50b5e6
--- /dev/null
+++ b/libnetdutils/include/netdutils/DumpWriter.h
@@ -0,0 +1,68 @@
+/*
+ * 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 NETDUTILS_DUMPWRITER_H_
+#define NETDUTILS_DUMPWRITER_H_
+
+#include <string>
+
+namespace android {
+namespace netdutils {
+
+class DumpWriter {
+ public:
+ DumpWriter(int fd);
+
+ void incIndent();
+ void decIndent();
+
+ void println(const std::string& line);
+ template <size_t n>
+ void println(const char line[n]) {
+ println(std::string(line));
+ }
+ // Hint to the compiler that it should apply printf validation of
+ // arguments (beginning at position 3) of the format (specified in
+ // position 2). Note that position 1 is the implicit "this" argument.
+ void println(const char* fmt, ...) __attribute__((__format__(__printf__, 2, 3)));
+ void blankline() { println(""); }
+
+ private:
+ uint8_t mIndentLevel;
+ int mFd;
+};
+
+class ScopedIndent {
+ public:
+ ScopedIndent() = delete;
+ ScopedIndent(const ScopedIndent&) = delete;
+ ScopedIndent(ScopedIndent&&) = delete;
+ explicit ScopedIndent(DumpWriter& dw) : mDw(dw) { mDw.incIndent(); }
+ ~ScopedIndent() { mDw.decIndent(); }
+ ScopedIndent& operator=(const ScopedIndent&) = delete;
+ ScopedIndent& operator=(ScopedIndent&&) = delete;
+
+ // TODO: consider additional {inc,dec}Indent methods and a counter that
+ // can be used to unwind all pending increments on exit.
+
+ private:
+ DumpWriter& mDw;
+};
+
+} // namespace netdutils
+} // namespace android
+
+#endif // NETDUTILS_DUMPWRITER_H_