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/*
* 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_
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