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// 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 

#include 

#include 

#include 

#if GTEST_OS_WINDOWS_MOBILE

# include   // For TerminateProcess()

#elif GTEST_OS_WINDOWS

# include 

# include 

#else

# include 

#endif  // GTEST_OS_WINDOWS_MOBILE

#if GTEST_OS_MAC

# include 

# include 

# include 

#endif  // GTEST_OS_MAC

#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 "src/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(thread_list),

                  sizeof(thread_t) * thread_count);

    return static_cast(thread_count);

  } 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(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 , 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.

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(-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(pattern_));

  free(const_cast(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(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 char* const file_name = file == NULL ? kUnknownFile : file;

  if (line < 0) {

    return String::Format("%s:", file_name).c_str();

  }

#ifdef _MSC_VER

  return String::Format("%s(%d):", file_name, line).c_str();

#else

  return String::Format("%s:%d:", file_name, line).c_str();

#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 char* const file_name = file == NULL ? kUnknownFile : file;

  if (line < 0)

    return file_name;

  else

    return String::Format("%s:%d", file_name, line).c_str();

}

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.

  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.

    char name_template[] = "/tmp/captured_stream.XXXXXX";

    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());

  }

  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 String content = ReadEntireFile(file);

    posix::FClose(file);

    return content;

  }

 private:

  // Reads the entire content of a file as a String.

  static 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(ftell(file));

}

// Reads the entire content of a file as a string.

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 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.

String GetCapturedStream(CapturedStream** captured_stream) {

  const 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.

String GetCapturedStdout() { return GetCapturedStream(&g_captured_stdout); }

// Stops capturing stderr and returns the captured string.

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 g_argvs;

// Returns the command line as a vector of strings.

const ::std::vector& GetArgvs() { 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 String FlagToEnvVar(const char* flag) {

  const 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(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 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 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 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