1 files changed, 87 insertions, 0 deletions
diff --git a/util/stringpiece.cc b/util/stringpiece.cc
new file mode 100644
index 0000000..37895b0
--- /dev/null
+++ b/util/stringpiece.cc
@@ -0,0 +1,87 @@
+// Copyright 2004 The RE2 Authors.  All Rights Reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "re2/stringpiece.h"
+#include "util/util.h"
+
+using re2::StringPiece;
+
+std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
+  o.write(piece.data(), piece.size());
+  return o;
+}
+
+bool StringPiece::_equal(const StringPiece& x, const StringPiece& y) {
+  int len = x.size();
+  if (len != y.size()) {
+    return false;
+  }
+  const char* p = x.data();
+  const char* p2 = y.data();
+  // Test last byte in case strings share large common prefix
+  if ((len > 0) && (p[len-1] != p2[len-1])) return false;
+  const char* p_limit = p + len;
+  for (; p < p_limit; p++, p2++) {
+    if (*p != *p2)
+      return false;
+  }
+  return true;
+}
+
+void StringPiece::CopyToString(string* target) const {
+  target->assign(ptr_, length_);
+}
+
+int StringPiece::copy(char* buf, size_type n, size_type pos) const {
+  int ret = min(length_ - pos, n);
+  memcpy(buf, ptr_ + pos, ret);
+  return ret;
+}
+
+int 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_ <= length_ ? xpos : npos;
+}
+
+int 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;
+}
+
+int 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 min(ulen, pos);
+
+  const char* last = ptr_ + 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;
+}
+
+int StringPiece::rfind(char c, size_type pos) const {
+  if (length_ <= 0) return npos;
+  for (int i = 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 > length_) pos = length_;
+  if (n > length_ - pos) n = length_ - pos;
+  return StringPiece(ptr_ + pos, n);
+}
+
+const StringPiece::size_type StringPiece::npos = size_type(-1);