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/DumpWriter.cpp b/libnetdutils/DumpWriter.cpp
new file mode 100644
index 0000000..092ddba
--- /dev/null
+++ b/libnetdutils/DumpWriter.cpp
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#include "netdutils/DumpWriter.h"
+
+#include <unistd.h>
+#include <limits>
+
+#include <android-base/stringprintf.h>
+#include <utils/String8.h>
+
+using android::base::StringAppendV;
+
+namespace android {
+namespace netdutils {
+
+namespace {
+
+const char kIndentString[] = " ";
+const size_t kIndentStringLen = strlen(kIndentString);
+
+} // namespace
+
+DumpWriter::DumpWriter(int fd) : mIndentLevel(0), mFd(fd) {}
+
+void DumpWriter::incIndent() {
+ if (mIndentLevel < std::numeric_limits<decltype(mIndentLevel)>::max()) {
+ mIndentLevel++;
+ }
+}
+
+void DumpWriter::decIndent() {
+ if (mIndentLevel > std::numeric_limits<decltype(mIndentLevel)>::min()) {
+ mIndentLevel--;
+ }
+}
+
+void DumpWriter::println(const std::string& line) {
+ if (!line.empty()) {
+ for (int i = 0; i < mIndentLevel; i++) {
+ ::write(mFd, kIndentString, kIndentStringLen);
+ }
+ ::write(mFd, line.c_str(), line.size());
+ }
+ ::write(mFd, "\n", 1);
+}
+
+// NOLINTNEXTLINE(cert-dcl50-cpp): Grandfathered C-style variadic function.
+void DumpWriter::println(const char* fmt, ...) {
+ std::string line;
+ va_list ap;
+ va_start(ap, fmt);
+ StringAppendV(&line, fmt, ap);
+ va_end(ap);
+ println(line);
+}
+
+} // namespace netdutils
+} // namespace android