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88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
// Copyright 2004 The RE2 Authors. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "re2/stringpiece.h"
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#include "util/util.h"
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using re2::StringPiece;
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std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
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o.write(piece.data(), piece.size());
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return o;
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}
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bool StringPiece::_equal(const StringPiece& x, const StringPiece& y) {
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int len = x.size();
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if (len != y.size()) {
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return false;
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}
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const char* p = x.data();
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const char* p2 = y.data();
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// Test last byte in case strings share large common prefix
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if ((len > 0) && (p[len-1] != p2[len-1])) return false;
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const char* p_limit = p + len;
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for (; p < p_limit; p++, p2++) {
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if (*p != *p2)
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return false;
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}
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return true;
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}
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void StringPiece::CopyToString(string* target) const {
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target->assign(ptr_, length_);
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}
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int StringPiece::copy(char* buf, size_type n, size_type pos) const {
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int ret = min(length_ - pos, n);
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memcpy(buf, ptr_ + pos, ret);
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return ret;
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}
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int StringPiece::find(const StringPiece& s, size_type pos) const {
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if (length_ < 0 || pos > static_cast<size_type>(length_))
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return npos;
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const char* result = std::search(ptr_ + pos, ptr_ + length_,
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s.ptr_, s.ptr_ + s.length_);
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const size_type xpos = result - ptr_;
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return xpos + s.length_ <= static_cast<size_type>(length_) ? xpos : npos;
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}
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int StringPiece::find(char c, size_type pos) const {
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if (length_ <= 0 || pos >= static_cast<size_type>(length_)) {
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return npos;
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}
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const char* result = std::find(ptr_ + pos, ptr_ + length_, c);
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return result != ptr_ + length_ ? result - ptr_ : npos;
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}
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int StringPiece::rfind(const StringPiece& s, size_type pos) const {
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if (length_ < s.length_) return npos;
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const size_t ulen = length_;
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if (s.length_ == 0) return min(ulen, pos);
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const char* last = ptr_ + min(ulen - s.length_, pos) + s.length_;
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const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
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return result != last ? result - ptr_ : npos;
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}
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int StringPiece::rfind(char c, size_type pos) const {
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if (length_ <= 0) return npos;
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for (int i = min(pos, static_cast<size_type>(length_ - 1));
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i >= 0; --i) {
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if (ptr_[i] == c) {
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return i;
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}
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}
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return npos;
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}
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StringPiece StringPiece::substr(size_type pos, size_type n) const {
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if (pos > static_cast<size_type>(length_)) pos = length_;
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if (n > length_ - pos) n = length_ - pos;
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return StringPiece(ptr_ + pos, n);
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}
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const StringPiece::size_type StringPiece::npos = size_type(-1);
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