1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "netdutils/DumpWriter.h"
18
19 #include <unistd.h>
20 #include <limits>
21
22 #include <android-base/stringprintf.h>
23 #include <utils/String8.h>
24
25 using android::base::StringAppendV;
26
27 namespace android {
28 namespace netdutils {
29
30 namespace {
31
32 const char kIndentString[] = " ";
33 const size_t kIndentStringLen = strlen(kIndentString);
34
35 } // namespace
36
DumpWriter(int fd)37 DumpWriter::DumpWriter(int fd) : mIndentLevel(0), mFd(fd) {}
38
incIndent()39 void DumpWriter::incIndent() {
40 if (mIndentLevel < std::numeric_limits<decltype(mIndentLevel)>::max()) {
41 mIndentLevel++;
42 }
43 }
44
decIndent()45 void DumpWriter::decIndent() {
46 if (mIndentLevel > std::numeric_limits<decltype(mIndentLevel)>::min()) {
47 mIndentLevel--;
48 }
49 }
50
println(const std::string & line)51 void DumpWriter::println(const std::string& line) {
52 if (!line.empty()) {
53 for (int i = 0; i < mIndentLevel; i++) {
54 ::write(mFd, kIndentString, kIndentStringLen);
55 }
56 ::write(mFd, line.c_str(), line.size());
57 }
58 ::write(mFd, "\n", 1);
59 }
60
61 // NOLINTNEXTLINE(cert-dcl50-cpp): Grandfathered C-style variadic function.
println(const char * fmt,...)62 void DumpWriter::println(const char* fmt, ...) {
63 std::string line;
64 va_list ap;
65 va_start(ap, fmt);
66 StringAppendV(&line, fmt, ap);
67 va_end(ap);
68 println(line);
69 }
70
71 } // namespace netdutils
72 } // namespace android
73