text: // Copyright 2008, 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)
  
  #include "gtest/internal/gtest-port.h"
  
  #include <limits.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  
  #if GTEST_OS_WINDOWS_MOBILE
  # include <windows.h>  // For TerminateProcess()
  #elif GTEST_OS_WINDOWS
  # include <io.h>
  # include <sys/stat.h>
  #else
  # include <unistd.h>
  #endif  // GTEST_OS_WINDOWS_MOBILE
  
  #if GTEST_OS_MAC
  # include <mach/mach_init.h>
  # include <mach/task.h>
  # include <mach/vm_map.h>
  #endif  // GTEST_OS_MAC
  
  #if GTEST_OS_QNX
  # include <devctl.h>
  # include <sys/procfs.h>
  #endif  // GTEST_OS_QNX
  
  #include "gtest/gtest-spi.h"
  #include "gtest/gtest-message.h"
  #include "gtest/internal/gtest-internal.h"
  #include "gtest/internal/gtest-string.h"
  
  // Indicates that this translation unit is part of Google Test's
  // implementation.  It must come before gtest-internal-inl.h is
  // included, or there will be a compiler error.  This trick is to
  // prevent a user from accidentally including gtest-internal-inl.h in
  // his code.
  #define GTEST_IMPLEMENTATION_ 1
  #include "gtest-internal-inl.h"
  #undef GTEST_IMPLEMENTATION_
  
  namespace testing {
  namespace internal {
  
  #if defined(_MSC_VER) || defined(__BORLANDC__)
  // MSVC and C++Builder do not provide a definition of STDERR_FILENO.
  const int kStdOutFileno = 1;
  const int kStdErrFileno = 2;
  #else
  const int kStdOutFileno = STDOUT_FILENO;
  const int kStdErrFileno = STDERR_FILENO;
  #endif  // _MSC_VER
  
  #if GTEST_OS_MAC
  
  // Returns the number of threads running in the process, or 0 to indicate that
  // we cannot detect it.
  size_t GetThreadCount() {
    const task_t task = mach_task_self();
    mach_msg_type_number_t thread_count;
    thread_act_array_t thread_list;
    const kern_return_t status = task_threads(task, &thread_list, &thread_count);
    if (status == KERN_SUCCESS) {
      // task_threads allocates resources in thread_list and we need to free them
      // to avoid leaks.
      vm_deallocate(task,
                    reinterpret_cast<vm_address_t>(thread_list),
                    sizeof(thread_t) * thread_count);
      return static_cast<size_t>(thread_count);
    } else {
      return 0;
    }
  }
  
  #elif GTEST_OS_QNX
  
  // Returns the number of threads running in the process, or 0 to indicate that
  // we cannot detect it.
  size_t GetThreadCount() {
    const int fd = open("/proc/self/as", O_RDONLY);
    if (fd < 0) {
      return 0;
    }
    procfs_info process_info;
    const int status =
        devctl(fd, DCMD_PROC_INFO, &process_info, sizeof(process_info), NULL);
    close(fd);
    if (status == EOK) {
      return static_cast<size_t>(process_info.num_threads);
    } else {
      return 0;
    }
  }
  
  #else
  
  size_t GetThreadCount() {
    // There's no portable way to detect the number of threads, so we just
    // return 0 to indicate that we cannot detect it.
    return 0;
  }
  
  #endif  // GTEST_OS_MAC
  
  #if GTEST_USES_POSIX_RE
  
  // Implements RE.  Currently only needed for death tests.
  
  RE::~RE() {
    if (is_valid_) {
      // regfree'ing an invalid regex might crash because the content
      // of the regex is undefined. Since the regex's are essentially
      // the same, one cannot be valid (or invalid) without the other
      // being so too.
      regfree(&partial_regex_);
      regfree(&full_regex_);
    }
    free(const_cast<char*>(pattern_));
  }
  
  // Returns true iff regular expression re matches the entire str.
  bool RE::FullMatch(const char* str, const RE& re) {
    if (!re.is_valid_) return false;
  
    regmatch_t match;
    return regexec(&re.full_regex_, str, 1, &match, 0) == 0;
  }
  
  // Returns true iff regular expression re matches a substring of str
  // (including str itself).
  bool RE::PartialMatch(const char* str, const RE& re) {
    if (!re.is_valid_) return false;
  
    regmatch_t match;
    return regexec(&re.partial_regex_, str, 1, &match, 0) == 0;
  }
  
  // Initializes an RE from its string representation.
  void RE::Init(const char* regex) {
    pattern_ = posix::StrDup(regex);
  
    // Reserves enough bytes to hold the regular expression used for a
    // full match.
    const size_t full_regex_len = strlen(regex) + 10;
    char* const full_pattern = new char[full_regex_len];
  
    snprintf(full_pattern, full_regex_len, "^(%s)$", regex);
    is_valid_ = regcomp(&full_regex_, full_pattern, REG_EXTENDED) == 0;
    // We want to call regcomp(&partial_regex_, ...) even if the
    // previous expression returns false.  Otherwise partial_regex_ may
    // not be properly initialized can may cause trouble when it's
    // freed.
    //
    // Some implementation of POSIX regex (e.g. on at least some
    // versions of Cygwin) doesn't accept the empty string as a valid
    // regex.  We change it to an equivalent form "()" to be safe.
    if (is_valid_) {
      const char* const partial_regex = (*regex == '\0') ? "()" : regex;
      is_valid_ = regcomp(&partial_regex_, partial_regex, REG_EXTENDED) == 0;
    }
    EXPECT_TRUE(is_valid_)
        << "Regular expression \"" << regex
        << "\" is not a valid POSIX Extended regular expression.";
  
    delete[] full_pattern;
  }
  
  #elif GTEST_USES_SIMPLE_RE
  
  // Returns true iff ch appears anywhere in str (excluding the
  // terminating '\0' character).
  bool IsInSet(char ch, const char* str) {
    return ch != '\0' && strchr(str, ch) != NULL;
  }
  
  // Returns true iff ch belongs to the given classification.  Unlike
  // similar functions in <ctype.h>, these aren't affected by the
  // current locale.
  bool IsAsciiDigit(char ch) { return '0' <= ch && ch <= '9'; }
  bool IsAsciiPunct(char ch) {
    return IsInSet(ch, "^-!\"#$%&'()*+,./:;<=>?@[\\]_`{|}~");
  }
  bool IsRepeat(char ch) { return IsInSet(ch, "?*+"); }
  bool IsAsciiWhiteSpace(char ch) { return IsInSet(ch, " \f\n\r\t\v"); }
  bool IsAsciiWordChar(char ch) {
    return ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z') ||
        ('0' <= ch && ch <= '9') || ch == '_';
  }
  
  // Returns true iff "\\c" is a supported escape sequence.
  bool IsValidEscape(char c) {
    return (IsAsciiPunct(c) || IsInSet(c, "dDfnrsStvwW"));
  }
  
  // Returns true iff the given atom (specified by escaped and pattern)
  // matches ch.  The result is undefined if the atom is invalid.
  bool AtomMatchesChar(bool escaped, char pattern_char, char ch) {
    if (escaped) {  // "\\p" where p is pattern_char.
      switch (pattern_char) {
        case 'd': return IsAsciiDigit(ch);
        case 'D': return !IsAsciiDigit(ch);
        case 'f': return ch == '\f';
        case 'n': return ch == '\n';
        case 'r': return ch == '\r';
        case 's': return IsAsciiWhiteSpace(ch);
        case 'S': return !IsAsciiWhiteSpace(ch);
        case 't': return ch == '\t';
        case 'v': return ch == '\v';
        case 'w': return IsAsciiWordChar(ch);
        case 'W': return !IsAsciiWordChar(ch);
      }
      return IsAsciiPunct(pattern_char) && pattern_char == ch;
    }
  
    return (pattern_char == '.' && ch != '\n') || pattern_char == ch;
  }
  
  // Helper function used by ValidateRegex() to format error messages.
  std::string FormatRegexSyntaxError(const char* regex, int index) {
    return (Message() << "Syntax error at index " << index
            << " in simple regular expression \"" << regex << "\": ").GetString();
  }
  
  // Generates non-fatal failures and returns false if regex is invalid;
  // otherwise returns true.
  bool ValidateRegex(const char* regex) {
    if (regex == NULL) {
      // TODO(wan@google.com): fix the source file location in the
      // assertion failures to match where the regex is used in user
      // code.
      ADD_FAILURE() << "NULL is not a valid simple regular expression.";
      return false;
    }
  
    bool is_valid = true;
  
    // True iff ?, *, or + can follow the previous atom.
    bool prev_repeatable = false;
    for (int i = 0; regex[i]; i++) {
      if (regex[i] == '\\') {  // An escape sequence
        i++;
        if (regex[i] == '\0') {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i - 1)
                        << "'\\' cannot appear at the end.";
          return false;
        }
  
        if (!IsValidEscape(regex[i])) {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i - 1)
                        << "invalid escape sequence \"\\" << regex[i] << "\".";
          is_valid = false;
        }
        prev_repeatable = true;
      } else {  // Not an escape sequence.
        const char ch = regex[i];
  
        if (ch == '^' && i > 0) {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i)
                        << "'^' can only appear at the beginning.";
          is_valid = false;
        } else if (ch == '$' && regex[i + 1] != '\0') {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i)
                        << "'$' can only appear at the end.";
          is_valid = false;
        } else if (IsInSet(ch, "()[]{}|")) {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i)
                        << "'" << ch << "' is unsupported.";
          is_valid = false;
        } else if (IsRepeat(ch) && !prev_repeatable) {
          ADD_FAILURE() << FormatRegexSyntaxError(regex, i)
                        << "'" << ch << "' can only follow a repeatable token.";
          is_valid = false;
        }
  
        prev_repeatable = !IsInSet(ch, "^$?*+");
      }
    }
  
    return is_valid;
  }
  
  // Matches a repeated regex atom followed by a valid simple regular
  // expression.  The regex atom is defined as c if escaped is false,
  // or \c otherwise.  repeat is the repetition meta character (?, *,
  // or +).  The behavior is undefined if str contains too many
  // characters to be indexable by size_t, in which case the test will
  // probably time out anyway.  We are fine with this limitation as
  // std::string has it too.
  bool MatchRepetitionAndRegexAtHead(
      bool escaped, char c, char repeat, const char* regex,
      const char* str) {
    const size_t min_count = (repeat == '+') ? 1 : 0;
    const size_t max_count = (repeat == '?') ? 1 :
        static_cast<size_t>(-1) - 1;
    // We cannot call numeric_limits::max() as it conflicts with the
    // max() macro on Windows.
  
    for (size_t i = 0; i <= max_count; ++i) {
      // We know that the atom matches each of the first i characters in str.
      if (i >= min_count && MatchRegexAtHead(regex, str + i)) {
        // We have enough matches at the head, and the tail matches too.
        // Since we only care about *whether* the pattern matches str
        // (as opposed to *how* it matches), there is no need to find a
        // greedy match.
        return true;
      }
      if (str[i] == '\0' || !AtomMatchesChar(escaped, c, str[i]))
        return false;
    }
    return false;
  }
  
  // Returns true iff regex matches a prefix of str.  regex must be a
  // valid simple regular expression and not start with "^", or the
  // result is undefined.
  bool MatchRegexAtHead(const char* regex, const char* str) {
    if (*regex == '\0')  // An empty regex matches a prefix of anything.
      return true;
  
    // "$" only matches the end of a string.  Note that regex being
    // valid guarantees that there's nothing after "$" in it.
    if (*regex == '$')
      return *str == '\0';
  
    // Is the first thing in regex an escape sequence?
    const bool escaped = *regex == '\\';
    if (escaped)
      ++regex;
    if (IsRepeat(regex[1])) {
      // MatchRepetitionAndRegexAtHead() calls MatchRegexAtHead(), so
      // here's an indirect recursion.  It terminates as the regex gets
      // shorter in each recursion.
      return MatchRepetitionAndRegexAtHead(
          escaped, regex[0], regex[1], regex + 2, str);
    } else {
      // regex isn't empty, isn't "$", and doesn't start with a
      // repetition.  We match the first atom of regex with the first
      // character of str and recurse.
      return (*str != '\0') && AtomMatchesChar(escaped, *regex, *str) &&
          MatchRegexAtHead(regex + 1, str + 1);
    }
  }
  
  // Returns true iff regex matches any substring of str.  regex must be
  // a valid simple regular expression, or the result is undefined.
  //
  // The algorithm is recursive, but the recursion depth doesn't exceed
  // the regex length, so we won't need to worry about running out of
  // stack space normally.  In rare cases the time complexity can be
  // exponential with respect to the regex length + the string length,
  // but usually it's must faster (often close to linear).
  bool MatchRegexAnywhere(const char* regex, const char* str) {
    if (regex == NULL || str == NULL)
      return false;
  
    if (*regex == '^')
      return MatchRegexAtHead(regex + 1, str);
  
    // A successful match can be anywhere in str.
    do {
      if (MatchRegexAtHead(regex, str))
        return true;
    } while (*str++ != '\0');
    return false;
  }
  
  // Implements the RE class.
  
  RE::~RE() {
    free(const_cast<char*>(pattern_));
    free(const_cast<char*>(full_pattern_));
  }
  
  // Returns true iff regular expression re matches the entire str.
  bool RE::FullMatch(const char* str, const RE& re) {
    return re.is_valid_ && MatchRegexAnywhere(re.full_pattern_, str);
  }
  
  // Returns true iff regular expression re matches a substring of str
  // (including str itself).
  bool RE::PartialMatch(const char* str, const RE& re) {
    return re.is_valid_ && MatchRegexAnywhere(re.pattern_, str);
  }
  
  // Initializes an RE from its string representation.
  void RE::Init(const char* regex) {
    pattern_ = full_pattern_ = NULL;
    if (regex != NULL) {
      pattern_ = posix::StrDup(regex);
    }
  
    is_valid_ = ValidateRegex(regex);
    if (!is_valid_) {
      // No need to calculate the full pattern when the regex is invalid.
      return;
    }
  
    const size_t len = strlen(regex);
    // Reserves enough bytes to hold the regular expression used for a
    // full match: we need space to prepend a '^', append a '$', and
    // terminate the string with '\0'.
    char* buffer = static_cast<char*>(malloc(len + 3));
    full_pattern_ = buffer;
  
    if (*regex != '^')
      *buffer++ = '^';  // Makes sure full_pattern_ starts with '^'.
  
    // We don't use snprintf or strncpy, as they trigger a warning when
    // compiled with VC++ 8.0.
    memcpy(buffer, regex, len);
    buffer += len;
  
    if (len == 0 || regex[len - 1] != '$')
      *buffer++ = '$';  // Makes sure full_pattern_ ends with '$'.
  
    *buffer = '\0';
  }
  
  #endif  // GTEST_USES_POSIX_RE
  
  const char kUnknownFile[] = "unknown file";
  
  // Formats a source file path and a line number as they would appear
  // in an error message from the compiler used to compile this code.
  GTEST_API_ ::std::string FormatFileLocation(const char* file, int line) {
    const std::string file_name(file == NULL ? kUnknownFile : file);
  
    if (line < 0) {
      return file_name + ":";
    }
  #ifdef _MSC_VER
    return file_name + "(" + StreamableToString(line) + "):";
  #else
    return file_name + ":" + StreamableToString(line) + ":";
  #endif  // _MSC_VER
  }
  
  // Formats a file location for compiler-independent XML output.
  // Although this function is not platform dependent, we put it next to
  // FormatFileLocation in order to contrast the two functions.
  // Note that FormatCompilerIndependentFileLocation() does NOT append colon
  // to the file location it produces, unlike FormatFileLocation().
  GTEST_API_ ::std::string FormatCompilerIndependentFileLocation(
      const char* file, int line) {
    const std::string file_name(file == NULL ? kUnknownFile : file);
  
    if (line < 0)
      return file_name;
    else
      return file_name + ":" + StreamableToString(line);
  }
  
  
  GTestLog::GTestLog(GTestLogSeverity severity, const char* file, int line)
      : severity_(severity) {
    const char* const marker =
        severity == GTEST_INFO ?    "[  INFO ]" :
        severity == GTEST_WARNING ? "[WARNING]" :
        severity == GTEST_ERROR ?   "[ ERROR ]" : "[ FATAL ]";
    GetStream() << ::std::endl << marker << " "
                << FormatFileLocation(file, line).c_str() << ": ";
  }
  
  // Flushes the buffers and, if severity is GTEST_FATAL, aborts the program.
  GTestLog::~GTestLog() {
    GetStream() << ::std::endl;
    if (severity_ == GTEST_FATAL) {
      fflush(stderr);
      posix::Abort();
    }
  }
  // Disable Microsoft deprecation warnings for POSIX functions called from
  // this class (creat, dup, dup2, and close)
  #ifdef _MSC_VER
  # pragma warning(push)
  # pragma warning(disable: 4996)
  #endif  // _MSC_VER
  
  #if GTEST_HAS_STREAM_REDIRECTION
  
  // Object that captures an output stream (stdout/stderr).
  class CapturedStream {
   public:
    // The ctor redirects the stream to a temporary file.
    explicit CapturedStream(int fd) : fd_(fd), uncaptured_fd_(dup(fd)) {
  # if GTEST_OS_WINDOWS
      char temp_dir_path[MAX_PATH + 1] = { '\0' };  // NOLINT
      char temp_file_path[MAX_PATH + 1] = { '\0' };  // NOLINT
  
      ::GetTempPathA(sizeof(temp_dir_path), temp_dir_path);
      const UINT success = ::GetTempFileNameA(temp_dir_path,
                                              "gtest_redir",
                                              0,  // Generate unique file name.
                                              temp_file_path);
      GTEST_CHECK_(success != 0)
          << "Unable to create a temporary file in " << temp_dir_path;
      const int captured_fd = creat(temp_file_path, _S_IREAD | _S_IWRITE);
      GTEST_CHECK_(captured_fd != -1) << "Unable to open temporary file "
                                      << temp_file_path;
      filename_ = temp_file_path;
  # else
      // There's no guarantee that a test has write access to the current
      // directory, so we create the temporary file in the /tmp directory
      // instead. We use /tmp on most systems, and /sdcard on Android.
      // That's because Android doesn't have /tmp.
  #  if GTEST_OS_LINUX_ANDROID
      // Note: Android applications are expected to call the framework's
      // Context.getExternalStorageDirectory() method through JNI to get
      // the location of the world-writable SD Card directory. However,
      // this requires a Context handle, which cannot be retrieved
      // globally from native code. Doing so also precludes running the
      // code as part of a regular standalone executable, which doesn't
      // run in a Dalvik process (e.g. when running it through 'adb shell').
      //
      // The location /sdcard is directly accessible from native code
      // and is the only location (unofficially) supported by the Android
      // team. It's generally a symlink to the real SD Card mount point
      // which can be /mnt/sdcard, /mnt/sdcard0, /system/media/sdcard, or
      // other OEM-customized locations. Never rely on these, and always
      // use /sdcard.
      char name_template[] = "/sdcard/gtest_captured_stream.XXXXXX";
  #  else
      char name_template[] = "/tmp/captured_stream.XXXXXX";
  #  endif  // GTEST_OS_LINUX_ANDROID
      const int captured_fd = mkstemp(name_template);
      filename_ = name_template;
  # endif  // GTEST_OS_WINDOWS
      fflush(NULL);
      dup2(captured_fd, fd_);
      close(captured_fd);
    }
  
    ~CapturedStream() {
      remove(filename_.c_str());
    }
  
    std::string GetCapturedString() {
      if (uncaptured_fd_ != -1) {
        // Restores the original stream.
        fflush(NULL);
        dup2(uncaptured_fd_, fd_);
        close(uncaptured_fd_);
        uncaptured_fd_ = -1;
      }
  
      FILE* const file = posix::FOpen(filename_.c_str(), "r");
      const std::string content = ReadEntireFile(file);
      posix::FClose(file);
      return content;
    }
  
   private:
    // Reads the entire content of a file as an std::string.
    static std::string ReadEntireFile(FILE* file);
  
    // Returns the size (in bytes) of a file.
    static size_t GetFileSize(FILE* file);
  
    const int fd_;  // A stream to capture.
    int uncaptured_fd_;
    // Name of the temporary file holding the stderr output.
    ::std::string filename_;
  
    GTEST_DISALLOW_COPY_AND_ASSIGN_(CapturedStream);
  };
  
  // Returns the size (in bytes) of a file.
  size_t CapturedStream::GetFileSize(FILE* file) {
    fseek(file, 0, SEEK_END);
    return static_cast<size_t>(ftell(file));
  }
  
  // Reads the entire content of a file as a string.
  std::string CapturedStream::ReadEntireFile(FILE* file) {
    const size_t file_size = GetFileSize(file);
    char* const buffer = new char[file_size];
  
    size_t bytes_last_read = 0;  // # of bytes read in the last fread()
    size_t bytes_read = 0;       // # of bytes read so far
  
    fseek(file, 0, SEEK_SET);
  
    // Keeps reading the file until we cannot read further or the
    // pre-determined file size is reached.
    do {
      bytes_last_read = fread(buffer+bytes_read, 1, file_size-bytes_read, file);
      bytes_read += bytes_last_read;
    } while (bytes_last_read > 0 && bytes_read < file_size);
  
    const std::string content(buffer, bytes_read);
    delete[] buffer;
  
    return content;
  }
  
  # ifdef _MSC_VER
  #  pragma warning(pop)
  # endif  // _MSC_VER
  
  static CapturedStream* g_captured_stderr = NULL;
  static CapturedStream* g_captured_stdout = NULL;
  
  // Starts capturing an output stream (stdout/stderr).
  void CaptureStream(int fd, const char* stream_name, CapturedStream** stream) {
    if (*stream != NULL) {
      GTEST_LOG_(FATAL) << "Only one " << stream_name
                        << " capturer can exist at a time.";
    }
    *stream = new CapturedStream(fd);
  }
  
  // Stops capturing the output stream and returns the captured string.
  std::string GetCapturedStream(CapturedStream** captured_stream) {
    const std::string content = (*captured_stream)->GetCapturedString();
  
    delete *captured_stream;
    *captured_stream = NULL;
  
    return content;
  }
  
  // Starts capturing stdout.
  void CaptureStdout() {
    CaptureStream(kStdOutFileno, "stdout", &g_captured_stdout);
  }
  
  // Starts capturing stderr.
  void CaptureStderr() {
    CaptureStream(kStdErrFileno, "stderr", &g_captured_stderr);
  }
  
  // Stops capturing stdout and returns the captured string.
  std::string GetCapturedStdout() {
    return GetCapturedStream(&g_captured_stdout);
  }
  
  // Stops capturing stderr and returns the captured string.
  std::string GetCapturedStderr() {
    return GetCapturedStream(&g_captured_stderr);
  }
  
  #endif  // GTEST_HAS_STREAM_REDIRECTION
  
  #if GTEST_HAS_DEATH_TEST
  
  // A copy of all command line arguments.  Set by InitGoogleTest().
  ::std::vector<testing::internal::string> g_argvs;
  
  static const ::std::vector<testing::internal::string>* g_injected_test_argvs =
                                          NULL;  // Owned.
  
  void SetInjectableArgvs(const ::std::vector<testing::internal::string>* argvs) {
    if (g_injected_test_argvs != argvs)
      delete g_injected_test_argvs;
    g_injected_test_argvs = argvs;
  }
  
  const ::std::vector<testing::internal::string>& GetInjectableArgvs() {
    if (g_injected_test_argvs != NULL) {
      return *g_injected_test_argvs;
    }
    return g_argvs;
  }
  #endif  // GTEST_HAS_DEATH_TEST
  
  #if GTEST_OS_WINDOWS_MOBILE
  namespace posix {
  void Abort() {
    DebugBreak();
    TerminateProcess(GetCurrentProcess(), 1);
  }
  }  // namespace posix
  #endif  // GTEST_OS_WINDOWS_MOBILE
  
  // Returns the name of the environment variable corresponding to the
  // given flag.  For example, FlagToEnvVar("foo") will return
  // "GTEST_FOO" in the open-source version.
  static std::string FlagToEnvVar(const char* flag) {
    const std::string full_flag =
        (Message() << GTEST_FLAG_PREFIX_ << flag).GetString();
  
    Message env_var;
    for (size_t i = 0; i != full_flag.length(); i++) {
      env_var << ToUpper(full_flag.c_str()[i]);
    }
  
    return env_var.GetString();
  }
  
  // Parses 'str' for a 32-bit signed integer.  If successful, writes
  // the result to *value and returns true; otherwise leaves *value
  // unchanged and returns false.
  bool ParseInt32(const Message& src_text, const char* str, Int32* value) {
    // Parses the environment variable as a decimal integer.
    char* end = NULL;
    const long long_value = strtol(str, &end, 10);  // NOLINT
  
    // Has strtol() consumed all characters in the string?
    if (*end != '\0') {
      // No - an invalid character was encountered.
      Message msg;
      msg << "WARNING: " << src_text
          << " is expected to be a 32-bit integer, but actually"
          << " has value \"" << str << "\".\n";
      printf("%s", msg.GetString().c_str());
      fflush(stdout);
      return false;
    }
  
    // Is the parsed value in the range of an Int32?
    const Int32 result = static_cast<Int32>(long_value);
    if (long_value == LONG_MAX || long_value == LONG_MIN ||
        // The parsed value overflows as a long.  (strtol() returns
        // LONG_MAX or LONG_MIN when the input overflows.)
        result != long_value
        // The parsed value overflows as an Int32.
        ) {
      Message msg;
      msg << "WARNING: " << src_text
          << " is expected to be a 32-bit integer, but actually"
          << " has value " << str << ", which overflows.\n";
      printf("%s", msg.GetString().c_str());
      fflush(stdout);
      return false;
    }
  
    *value = result;
    return true;
  }
  
  // Reads and returns the Boolean environment variable corresponding to
  // the given flag; if it's not set, returns default_value.
  //
  // The value is considered true iff it's not "0".
  bool BoolFromGTestEnv(const char* flag, bool default_value) {
    const std::string env_var = FlagToEnvVar(flag);
    const char* const string_value = posix::GetEnv(env_var.c_str());
    return string_value == NULL ?
        default_value : strcmp(string_value, "0") != 0;
  }
  
  // Reads and returns a 32-bit integer stored in the environment
  // variable corresponding to the given flag; if it isn't set or
  // doesn't represent a valid 32-bit integer, returns default_value.
  Int32 Int32FromGTestEnv(const char* flag, Int32 default_value) {
    const std::string env_var = FlagToEnvVar(flag);
    const char* const string_value = posix::GetEnv(env_var.c_str());
    if (string_value == NULL) {
      // The environment variable is not set.
      return default_value;
    }
  
    Int32 result = default_value;
    if (!ParseInt32(Message() << "Environment variable " << env_var,
                    string_value, &result)) {
      printf("The default value %s is used.\n",
             (Message() << default_value).GetString().c_str());
      fflush(stdout);
      return default_value;
    }
  
    return result;
  }
  
  // Reads and returns the string environment variable corresponding to
  // the given flag; if it's not set, returns default_value.
  const char* StringFromGTestEnv(const char* flag, const char* default_value) {
    const std::string env_var = FlagToEnvVar(flag);
    const char* const value = posix::GetEnv(env_var.c_str());
    return value == NULL ? default_value : value;
  }
  
  }  // namespace internal
  }  // namespace testing
  