1 /*
2 * Copyright (C) 2010 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 "stringpiece.h"
18
19 #include <iostream>
20 #include <utility>
21
22 namespace art {
23
CopyToString(std::string * target) const24 void StringPiece::CopyToString(std::string* target) const {
25 target->assign(ptr_, length_);
26 }
27
copy(char * buf,size_type n,size_type pos) const28 int StringPiece::copy(char* buf, size_type n, size_type pos) const {
29 int ret = std::min(length_ - pos, n);
30 memcpy(buf, ptr_ + pos, ret);
31 return ret;
32 }
33
find(const StringPiece & s,size_type pos) const34 StringPiece::size_type StringPiece::find(const StringPiece& s, size_type pos) const {
35 if (length_ < 0 || pos > static_cast<size_type>(length_))
36 return npos;
37
38 const char* result = std::search(ptr_ + pos, ptr_ + length_,
39 s.ptr_, s.ptr_ + s.length_);
40 const size_type xpos = result - ptr_;
41 return xpos + s.length_ <= static_cast<size_type>(length_) ? xpos : npos;
42 }
43
compare(const StringPiece & x) const44 int StringPiece::compare(const StringPiece& x) const {
45 int r = memcmp(ptr_, x.ptr_, std::min(length_, x.length_));
46 if (r == 0) {
47 if (length_ < x.length_) r = -1;
48 else if (length_ > x.length_) r = +1;
49 }
50 return r;
51 }
52
find(char c,size_type pos) const53 StringPiece::size_type StringPiece::find(char c, size_type pos) const {
54 if (length_ <= 0 || pos >= static_cast<size_type>(length_)) {
55 return npos;
56 }
57 const char* result = std::find(ptr_ + pos, ptr_ + length_, c);
58 return result != ptr_ + length_ ? result - ptr_ : npos;
59 }
60
rfind(const StringPiece & s,size_type pos) const61 StringPiece::size_type StringPiece::rfind(const StringPiece& s, size_type pos) const {
62 if (length_ < s.length_) return npos;
63 const size_t ulen = length_;
64 if (s.length_ == 0) return std::min(ulen, pos);
65
66 const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_;
67 const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
68 return result != last ? result - ptr_ : npos;
69 }
70
rfind(char c,size_type pos) const71 StringPiece::size_type StringPiece::rfind(char c, size_type pos) const {
72 if (length_ <= 0) return npos;
73 for (int i = std::min(pos, static_cast<size_type>(length_ - 1));
74 i >= 0; --i) {
75 if (ptr_[i] == c) {
76 return i;
77 }
78 }
79 return npos;
80 }
81
substr(size_type pos,size_type n) const82 StringPiece StringPiece::substr(size_type pos, size_type n) const {
83 if (pos > static_cast<size_type>(length_)) pos = length_;
84 if (n > length_ - pos) n = length_ - pos;
85 return StringPiece(ptr_ + pos, n);
86 }
87
88 const StringPiece::size_type StringPiece::npos = size_type(-1);
89
operator <<(std::ostream & o,const StringPiece & piece)90 std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
91 o.write(piece.data(), piece.size());
92 return o;
93 }
94
95 } // namespace art
96