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+// Copyright 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: wan@google.com (Zhanyong Wan)
+
+// Google Mock - a framework for writing C++ mock classes.
+//
+// This file implements a universal value printer that can print a
+// value of any type T:
+//
+//   void ::testing::internal::UniversalPrinter<T>::Print(value, ostream_ptr);
+//
+// It uses the << operator when possible, and prints the bytes in the
+// object otherwise.  A user can override its behavior for a class
+// type Foo by defining either operator<<(::std::ostream&, const Foo&)
+// or void PrintTo(const Foo&, ::std::ostream*) in the namespace that
+// defines Foo.
+
+#include <gmock/gmock-printers.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <ostream>  // NOLINT
+#include <string>
+#include <gmock/internal/gmock-port.h>
+
+namespace testing {
+
+namespace {
+
+using ::std::ostream;
+
+#ifdef _WIN32_WCE
+#define snprintf _snprintf
+#elif GTEST_OS_WINDOWS
+#define snprintf _snprintf_s
+#endif
+
+// Prints a segment of bytes in the given object.
+void PrintByteSegmentInObjectTo(const unsigned char* obj_bytes, size_t start,
+                                size_t count, ostream* os) {
+  char text[5] = "";
+  for (size_t i = 0; i != count; i++) {
+    const size_t j = start + i;
+    if (i != 0) {
+      // Organizes the bytes into groups of 2 for easy parsing by
+      // human.
+      if ((j % 2) == 0) {
+        *os << " ";
+      }
+    }
+    snprintf(text, sizeof(text), "%02X", obj_bytes[j]);
+    *os << text;
+  }
+}
+
+// Prints the bytes in the given value to the given ostream.
+void PrintBytesInObjectToImpl(const unsigned char* obj_bytes, size_t count,
+                              ostream* os) {
+  // Tells the user how big the object is.
+  *os << count << "-byte object <";
+
+  const size_t kThreshold = 132;
+  const size_t kChunkSize = 64;
+  // If the object size is bigger than kThreshold, we'll have to omit
+  // some details by printing only the first and the last kChunkSize
+  // bytes.
+  // TODO(wan): let the user control the threshold using a flag.
+  if (count < kThreshold) {
+    PrintByteSegmentInObjectTo(obj_bytes, 0, count, os);
+  } else {
+    PrintByteSegmentInObjectTo(obj_bytes, 0, kChunkSize, os);
+    *os << " ... ";
+    // Rounds up to 2-byte boundary.
+    const size_t resume_pos = (count - kChunkSize + 1)/2*2;
+    PrintByteSegmentInObjectTo(obj_bytes, resume_pos, count - resume_pos, os);
+  }
+  *os << ">";
+}
+
+}  // namespace
+
+namespace internal2 {
+
+// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
+// given object.  The delegation simplifies the implementation, which
+// uses the << operator and thus is easier done outside of the
+// ::testing::internal namespace, which contains a << operator that
+// sometimes conflicts with the one in STL.
+void PrintBytesInObjectTo(const unsigned char* obj_bytes, size_t count,
+                          ostream* os) {
+  PrintBytesInObjectToImpl(obj_bytes, count, os);
+}
+
+}  // namespace internal2
+
+namespace internal {
+
+// Prints a wide char as a char literal without the quotes, escaping it
+// when necessary.
+static void PrintAsWideCharLiteralTo(wchar_t c, ostream* os) {
+  switch (c) {
+    case L'\0':
+      *os << "\\0";
+      break;
+    case L'\'':
+      *os << "\\'";
+      break;
+    case L'\?':
+      *os << "\\?";
+      break;
+    case L'\\':
+      *os << "\\\\";
+      break;
+    case L'\a':
+      *os << "\\a";
+      break;
+    case L'\b':
+      *os << "\\b";
+      break;
+    case L'\f':
+      *os << "\\f";
+      break;
+    case L'\n':
+      *os << "\\n";
+      break;
+    case L'\r':
+      *os << "\\r";
+      break;
+    case L'\t':
+      *os << "\\t";
+      break;
+    case L'\v':
+      *os << "\\v";
+      break;
+    default:
+      // Checks whether c is printable or not. Printable characters are in
+      // the range [0x20,0x7E].
+      // We test the value of c directly instead of calling isprint(), as
+      // isprint() is buggy on Windows mobile.
+      if (0x20 <= c && c <= 0x7E) {
+        *os << static_cast<char>(c);
+      } else {
+        // Buffer size enough for the maximum number of digits and \0.
+        char text[2 * sizeof(unsigned long) + 1] = "";
+        snprintf(text, sizeof(text), "%lX", static_cast<unsigned long>(c));
+        *os << "\\x" << text;
+      }
+  }
+}
+
+// Prints a char as if it's part of a string literal, escaping it when
+// necessary.
+static void PrintAsWideStringLiteralTo(wchar_t c, ostream* os) {
+  switch (c) {
+    case L'\'':
+      *os << "'";
+      break;
+    case L'"':
+      *os << "\\\"";
+      break;
+    default:
+      PrintAsWideCharLiteralTo(c, os);
+  }
+}
+
+// Prints a char as a char literal without the quotes, escaping it
+// when necessary.
+static void PrintAsCharLiteralTo(char c, ostream* os) {
+  PrintAsWideCharLiteralTo(static_cast<unsigned char>(c), os);
+}
+
+// Prints a char as if it's part of a string literal, escaping it when
+// necessary.
+static void PrintAsStringLiteralTo(char c, ostream* os) {
+  PrintAsWideStringLiteralTo(static_cast<unsigned char>(c), os);
+}
+
+// Prints a char and its code.  The '\0' char is printed as "'\\0'",
+// other unprintable characters are also properly escaped using the
+// standard C++ escape sequence.
+void PrintCharTo(char c, int char_code, ostream* os) {
+  *os << "'";
+  PrintAsCharLiteralTo(c, os);
+  *os << "'";
+  if (c != '\0')
+    *os << " (" << char_code << ")";
+}
+
+// Prints a wchar_t as a symbol if it is printable or as its internal
+// code otherwise and also as its decimal code (except for L'\0').
+// The L'\0' char is printed as "L'\\0'". The decimal code is printed
+// as signed integer when wchar_t is implemented by the compiler
+// as a signed type and is printed as an unsigned integer when wchar_t
+// is implemented as an unsigned type.
+void PrintTo(wchar_t wc, ostream* os) {
+  *os << "L'";
+  PrintAsWideCharLiteralTo(wc, os);
+  *os << "'";
+  if (wc != L'\0') {
+    // Type Int64 is used because it provides more storage than wchar_t thus
+    // when the compiler converts signed or unsigned implementation of wchar_t
+    // to Int64 it fills higher bits with either zeros or the sign bit
+    // passing it to operator <<() as either signed or unsigned integer.
+    *os << " (" << static_cast<Int64>(wc) << ")";
+  }
+}
+
+// Prints the given array of characters to the ostream.
+// The array starts at *begin, the length is len, it may include '\0' characters
+// and may not be null-terminated.
+static void PrintCharsAsStringTo(const char* begin, size_t len, ostream* os) {
+  *os << "\"";
+  for (size_t index = 0; index < len; ++index) {
+    PrintAsStringLiteralTo(begin[index], os);
+  }
+  *os << "\"";
+}
+
+// Prints the given array of wide characters to the ostream.
+// The array starts at *begin, the length is len, it may include L'\0'
+// characters and may not be null-terminated.
+static void PrintWideCharsAsStringTo(const wchar_t* begin, size_t len,
+                                     ostream* os) {
+  *os << "L\"";
+  for (size_t index = 0; index < len; ++index) {
+    PrintAsWideStringLiteralTo(begin[index], os);
+  }
+  *os << "\"";
+}
+
+// Prints the given C string to the ostream.
+void PrintTo(const char* s, ostream* os) {
+  if (s == NULL) {
+    *os << "NULL";
+  } else {
+    *os << implicit_cast<const void*>(s) << " pointing to ";
+    PrintCharsAsStringTo(s, strlen(s), os);
+  }
+}
+
+// MSVC compiler can be configured to define whar_t as a typedef
+// of unsigned short. Defining an overload for const wchar_t* in that case
+// would cause pointers to unsigned shorts be printed as wide strings,
+// possibly accessing more memory than intended and causing invalid
+// memory accesses. MSVC defines _NATIVE_WCHAR_T_DEFINED symbol when
+// wchar_t is implemented as a native type.
+#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
+// Prints the given wide C string to the ostream.
+void PrintTo(const wchar_t* s, ostream* os) {
+  if (s == NULL) {
+    *os << "NULL";
+  } else {
+    *os << implicit_cast<const void*>(s) << " pointing to ";
+    PrintWideCharsAsStringTo(s, wcslen(s), os);
+  }
+}
+#endif  // wchar_t is native
+
+// Prints a ::string object.
+#if GTEST_HAS_GLOBAL_STRING
+void PrintStringTo(const ::string& s, ostream* os) {
+  PrintCharsAsStringTo(s.data(), s.size(), os);
+}
+#endif  // GTEST_HAS_GLOBAL_STRING
+
+#if GTEST_HAS_STD_STRING
+void PrintStringTo(const ::std::string& s, ostream* os) {
+  PrintCharsAsStringTo(s.data(), s.size(), os);
+}
+#endif  // GTEST_HAS_STD_STRING
+
+// Prints a ::wstring object.
+#if GTEST_HAS_GLOBAL_WSTRING
+void PrintWideStringTo(const ::wstring& s, ostream* os) {
+  PrintWideCharsAsStringTo(s.data(), s.size(), os);
+}
+#endif  // GTEST_HAS_GLOBAL_WSTRING
+
+#if GTEST_HAS_STD_WSTRING
+void PrintWideStringTo(const ::std::wstring& s, ostream* os) {
+  PrintWideCharsAsStringTo(s.data(), s.size(), os);
+}
+#endif  // GTEST_HAS_STD_WSTRING
+
+}  // namespace internal
+
+}  // namespace testing