1 /*
2 * Copyright (C) 2015, 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 "code_writer.h"
18
19 #include <iostream>
20 #include <stdarg.h>
21
22 #include <android-base/stringprintf.h>
23
24 using std::cerr;
25 using std::endl;
26
27 namespace android {
28 namespace aidl {
29
30 namespace {
31
32 class StringCodeWriter : public CodeWriter {
33 public:
StringCodeWriter(std::string * output_buffer)34 StringCodeWriter(std::string* output_buffer) : output_(output_buffer) {}
35 virtual ~StringCodeWriter() = default;
36
Write(const char * format,...)37 bool Write(const char* format, ...) override {
38 va_list ap;
39 va_start(ap, format);
40 android::base::StringAppendV(output_, format, ap);
41 va_end(ap);
42 return true;
43 }
44
Close()45 bool Close() override { return true; }
46
47 private:
48 std::string* output_;
49 }; // class StringCodeWriter
50
51 class FileCodeWriter : public CodeWriter {
52 public:
FileCodeWriter(FILE * output_file,bool close_on_destruction)53 FileCodeWriter(FILE* output_file, bool close_on_destruction)
54 : output_(output_file),
55 close_on_destruction_(close_on_destruction) {}
~FileCodeWriter()56 virtual ~FileCodeWriter() {
57 if (close_on_destruction_ && output_ != nullptr) {
58 fclose(output_);
59 }
60 }
61
Write(const char * format,...)62 bool Write(const char* format, ...) override {
63 bool success;
64 va_list ap;
65 va_start(ap, format);
66 success = vfprintf(output_, format, ap) >= 0;
67 va_end(ap);
68 no_error_ = no_error_ && success;
69 return success;
70 }
71
Close()72 bool Close() override {
73 if (output_ != nullptr) {
74 no_error_ = fclose(output_) == 0 && no_error_;
75 output_ = nullptr;
76 }
77 return no_error_;
78 }
79
80 private:
81 bool no_error_ = true;
82 FILE* output_;
83 bool close_on_destruction_;
84 }; // class StringCodeWriter
85
86 } // namespace
87
GetFileWriter(const std::string & output_file)88 CodeWriterPtr GetFileWriter(const std::string& output_file) {
89 CodeWriterPtr result;
90 FILE* to = nullptr;
91 bool close_on_destruction = true;
92 if (output_file == "-") {
93 to = stdout;
94 close_on_destruction = false;
95 } else {
96 // open file in binary mode to ensure that the tool produces the
97 // same output on all platforms !!
98 to = fopen(output_file.c_str(), "wb");
99 }
100
101 if (to != nullptr) {
102 result.reset(new FileCodeWriter(to, close_on_destruction));
103 } else {
104 cerr << "unable to open " << output_file << " for write" << endl;
105 }
106
107 return result;
108 }
109
GetStringWriter(std::string * output_buffer)110 CodeWriterPtr GetStringWriter(std::string* output_buffer) {
111 return CodeWriterPtr(new StringCodeWriter(output_buffer));
112 }
113
114 } // namespace aidl
115 } // namespace android
116