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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "stringpiece.h"
#include <iostream>
#include <utility>
namespace art {
void StringPiece::CopyToString(std::string* target) const {
target->assign(ptr_, length_);
}
int StringPiece::copy(char* buf, size_type n, size_type pos) const {
int ret = std::min(length_ - pos, n);
memcpy(buf, ptr_ + pos, ret);
return ret;
}
StringPiece::size_type StringPiece::find(const StringPiece& s, size_type pos) const {
if (length_ < 0 || pos > static_cast<size_type>(length_))
return npos;
const char* result = std::search(ptr_ + pos, ptr_ + length_,
s.ptr_, s.ptr_ + s.length_);
const size_type xpos = result - ptr_;
return xpos + s.length_ <= static_cast<size_type>(length_) ? xpos : npos;
}
int StringPiece::compare(const StringPiece& x) const {
int r = memcmp(ptr_, x.ptr_, std::min(length_, x.length_));
if (r == 0) {
if (length_ < x.length_) r = -1;
else if (length_ > x.length_) r = +1;
}
return r;
}
StringPiece::size_type StringPiece::find(char c, size_type pos) const {
if (length_ <= 0 || pos >= static_cast<size_type>(length_)) {
return npos;
}
const char* result = std::find(ptr_ + pos, ptr_ + length_, c);
return result != ptr_ + length_ ? result - ptr_ : npos;
}
StringPiece::size_type StringPiece::rfind(const StringPiece& s, size_type pos) const {
if (length_ < s.length_) return npos;
const size_t ulen = length_;
if (s.length_ == 0) return std::min(ulen, pos);
const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_;
const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
return result != last ? result - ptr_ : npos;
}
StringPiece::size_type StringPiece::rfind(char c, size_type pos) const {
if (length_ <= 0) return npos;
for (int i = std::min(pos, static_cast<size_type>(length_ - 1));
i >= 0; --i) {
if (ptr_[i] == c) {
return i;
}
}
return npos;
}
StringPiece StringPiece::substr(size_type pos, size_type n) const {
if (pos > static_cast<size_type>(length_)) pos = length_;
if (n > length_ - pos) n = length_ - pos;
return StringPiece(ptr_ + pos, n);
}
const StringPiece::size_type StringPiece::npos = size_type(-1);
std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
o.write(piece.data(), piece.size());
return o;
}
} // namespace art
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