1 /*
2 * Copyright (C) 2018 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 "perfetto/base/string_splitter.h"
18
19 #include <utility>
20
21 #include "perfetto/base/logging.h"
22
23 namespace perfetto {
24 namespace base {
25
StringSplitter(std::string str,char delimiter)26 StringSplitter::StringSplitter(std::string str, char delimiter)
27 : str_(std::move(str)), delimiter_(delimiter) {
28 // It's legal to access str[str.size()] in C++11 (it always returns \0),
29 // hence the +1 (which becomes just size() after the -1 in Initialize()).
30 Initialize(&str_[0], str_.size() + 1);
31 }
32
StringSplitter(char * str,size_t size,char delimiter)33 StringSplitter::StringSplitter(char* str, size_t size, char delimiter)
34 : delimiter_(delimiter) {
35 Initialize(str, size);
36 }
37
StringSplitter(StringSplitter * outer,char delimiter)38 StringSplitter::StringSplitter(StringSplitter* outer, char delimiter)
39 : delimiter_(delimiter) {
40 Initialize(outer->cur_token(), outer->cur_token_size() + 1);
41 }
42
Initialize(char * str,size_t size)43 void StringSplitter::Initialize(char* str, size_t size) {
44 PERFETTO_DCHECK(!size || str);
45 next_ = str;
46 end_ = str + size;
47 cur_ = nullptr;
48 cur_size_ = 0;
49 if (size)
50 next_[size - 1] = '\0';
51 }
52
Next()53 bool StringSplitter::Next() {
54 for (; next_ < end_; next_++) {
55 if (*next_ == delimiter_)
56 continue;
57 cur_ = next_;
58 for (;; next_++) {
59 if (*next_ == delimiter_) {
60 cur_size_ = static_cast<size_t>(next_ - cur_);
61 *(next_++) = '\0';
62 break;
63 }
64 if (*next_ == '\0') {
65 cur_size_ = static_cast<size_t>(next_ - cur_);
66 next_ = end_;
67 break;
68 }
69 }
70 if (*cur_)
71 return true;
72 break;
73 }
74 cur_ = nullptr;
75 cur_size_ = 0;
76 return false;
77 }
78
79 } // namespace base
80 } // namespace perfetto
81