1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "util/string_builder.h"
17
18 #include <cstdlib>
19 #include <cstring>
20
21 #include "securec.h"
22 #include "util/common.h"
23 #include "util/logger.h"
24 #include "util/string_helper.h"
25
26 namespace OHOS {
27 namespace Idl {
~StringBuilder()28 StringBuilder::~StringBuilder()
29 {
30 if (buffer_ != nullptr) {
31 free(buffer_);
32 }
33 }
34
Append(char c)35 StringBuilder &StringBuilder::Append(char c)
36 {
37 if (position_ + 1 >= capacity_) {
38 if (!Grow(1)) {
39 return *this;
40 }
41 }
42
43 buffer_[position_] = c;
44 position_ += 1;
45 return *this;
46 }
47
Append(const char * string)48 StringBuilder &StringBuilder::Append(const char *string)
49 {
50 if (string == nullptr || string[0] == '\0') {
51 return *this;
52 }
53
54 size_t len = strlen(string);
55 if (position_ + len >= capacity_) {
56 if (!Grow(len)) {
57 return *this;
58 }
59 }
60
61 int ret = memcpy_s(buffer_ + position_, capacity_ - position_, string, len);
62 if (ret != 0) {
63 Logger::E(TAG, "memcpy_s error ret = %d!", ret);
64 return *this;
65 }
66 position_ += len;
67 return *this;
68 }
69
Append(const std::string & string)70 StringBuilder &StringBuilder::Append(const std::string &string)
71 {
72 if (string.empty()) {
73 return *this;
74 }
75
76 size_t len = string.size();
77 if (position_ + len >= capacity_) {
78 if (!Grow(len)) {
79 return *this;
80 }
81 }
82
83 int ret = memcpy_s(buffer_ + position_, capacity_ - position_, string.c_str(), len);
84 if (ret != 0) {
85 Logger::E(TAG, "memcpy_s error ret = %d!", ret);
86 return *this;
87 }
88 position_ += len;
89 return *this;
90 }
91
AppendFormat(const char * format,...)92 StringBuilder &StringBuilder::AppendFormat(const char *format, ...)
93 {
94 va_list args;
95 va_list argsCopy;
96
97 va_start(args, format);
98 va_copy(argsCopy, args);
99
100 char buf[StringHelper::lineMaxSize] = {0};
101 int len = vsnprintf_s(buf, StringHelper::lineMaxSize, StringHelper::lineMaxSize - 1, format, args);
102 if (len <= 0) {
103 va_end(args);
104 va_end(argsCopy);
105 return *this;
106 }
107
108 size_t writeSize = static_cast<size_t>(len);
109 if (position_ + writeSize >= capacity_) {
110 if (!Grow(writeSize)) {
111 va_end(args);
112 va_end(argsCopy);
113 return *this;
114 }
115 }
116
117 if (vsnprintf_s(buffer_ + position_, writeSize + 1, writeSize, format, argsCopy) < 0) {
118 va_end(args);
119 va_end(argsCopy);
120 return *this;
121 }
122 position_ += writeSize;
123
124 va_end(args);
125 va_end(argsCopy);
126
127 return *this;
128 }
129
Grow(size_t size)130 bool StringBuilder::Grow(size_t size)
131 {
132 if (capacity_ > StringHelper::maxSize) {
133 Logger::E(TAG, "The StringBuilder is full.");
134 return false;
135 }
136 // 256->the default capacity.
137 size_t newSize = (capacity_ == 0) ? 256 : (capacity_ * 2);
138 if (newSize < capacity_ + size) {
139 newSize = capacity_ + size;
140 }
141 if (newSize > StringHelper::maxSize) {
142 newSize = StringHelper::maxSize;
143 }
144 if (newSize <= capacity_) {
145 return false;
146 }
147
148 char *newBuffer = reinterpret_cast<char *>(calloc(newSize, 1));
149 if (newBuffer == nullptr) {
150 Logger::E(TAG, "Fail to malloc %lu bytes memory.", newSize);
151 return false;
152 }
153
154 if (buffer_ != nullptr) {
155 int ret = memcpy_s(newBuffer, newSize, buffer_, capacity_);
156 free(buffer_);
157 buffer_ = nullptr;
158 if (ret != 0) {
159 Logger::E(TAG, "memcpy_s error ret = %d!", ret);
160 free(newBuffer);
161 return false;
162 }
163 }
164 buffer_ = newBuffer;
165 capacity_ = newSize;
166 return true;
167 }
168
ToString() const169 std::string StringBuilder::ToString() const
170 {
171 if (buffer_ == nullptr) {
172 return "";
173 }
174 return std::string(buffer_, position_);
175 }
176 } // namespace Idl
177 } // namespace OHOS