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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 "gmock/gmock.h"
 #include "gmock/internal/gmock-port.h"
 
 namespace testing {
 
 // TODO(wan@google.com): support using environment variables to
 // control the flag values, like what Google Test does.
 
 GMOCK_DEFINE_bool_(catch_leaked_mocks, true,
                    "true iff Google Mock should report leaked mock objects "
                    "as failures.");
 
 GMOCK_DEFINE_string_(verbose, internal::kWarningVerbosity,
                      "Controls how verbose Google Mock's output is."
                      "  Valid values:\n"
                      "  info    - prints all messages.\n"
                      "  warning - prints warnings and errors.\n"
                      "  error   - prints errors only.");
 
 namespace internal {
 
 // Parses a string as a command line flag.  The string should have the
 // format "--gmock_flag=value".  When def_optional is true, the
 // "=value" part can be omitted.
 //
 // Returns the value of the flag, or NULL if the parsing failed.
 static const char* ParseGoogleMockFlagValue(const char* str,
                                             const char* flag,
                                             bool def_optional) {
   // str and flag must not be NULL.
   if (str == NULL || flag == NULL) return NULL;
 
   // The flag must start with "--gmock_".
   const std::string flag_str = std::string("--gmock_") + flag;
   const size_t flag_len = flag_str.length();
   if (strncmp(str, flag_str.c_str(), flag_len) != 0) return NULL;
 
   // Skips the flag name.
   const char* flag_end = str + flag_len;
 
   // When def_optional is true, it's OK to not have a "=value" part.
   if (def_optional && (flag_end[0] == '\0')) {
     return flag_end;
   }
 
   // If def_optional is true and there are more characters after the
   // flag name, or if def_optional is false, there must be a '=' after
   // the flag name.
   if (flag_end[0] != '=') return NULL;
 
   // Returns the string after "=".
   return flag_end + 1;
 }
 
 // Parses a string for a Google Mock bool flag, in the form of
 // "--gmock_flag=value".
 //
 // On success, stores the value of the flag in *value, and returns
 // true.  On failure, returns false without changing *value.
 static bool ParseGoogleMockBoolFlag(const char* str, const char* flag,
                                     bool* value) {
   // Gets the value of the flag as a string.
   const char* const value_str = ParseGoogleMockFlagValue(str, flag, true);
 
   // Aborts if the parsing failed.
   if (value_str == NULL) return false;
 
   // Converts the string value to a bool.
   *value = !(*value_str == '0' || *value_str == 'f' || *value_str == 'F');
   return true;
 }
 
 // Parses a string for a Google Mock string flag, in the form of
 // "--gmock_flag=value".
 //
 // On success, stores the value of the flag in *value, and returns
 // true.  On failure, returns false without changing *value.
 template <typename String>
 static bool ParseGoogleMockStringFlag(const char* str, const char* flag,
                                       String* value) {
   // Gets the value of the flag as a string.
   const char* const value_str = ParseGoogleMockFlagValue(str, flag, false);
 
   // Aborts if the parsing failed.
   if (value_str == NULL) return false;
 
   // Sets *value to the value of the flag.
   *value = value_str;
   return true;
 }
 
 // The internal implementation of InitGoogleMock().
 //
 // The type parameter CharType can be instantiated to either char or
 // wchar_t.
 template <typename CharType>
 void InitGoogleMockImpl(int* argc, CharType** argv) {
   // Makes sure Google Test is initialized.  InitGoogleTest() is
   // idempotent, so it's fine if the user has already called it.
   InitGoogleTest(argc, argv);
   if (*argc <= 0) return;
 
   for (int i = 1; i != *argc; i++) {
     const std::string arg_string = StreamableToString(argv[i]);
     const char* const arg = arg_string.c_str();
 
     // Do we see a Google Mock flag?
     if (ParseGoogleMockBoolFlag(arg, "catch_leaked_mocks",
                                 &GMOCK_FLAG(catch_leaked_mocks)) ||
         ParseGoogleMockStringFlag(arg, "verbose", &GMOCK_FLAG(verbose))) {
       // Yes.  Shift the remainder of the argv list left by one.  Note
       // that argv has (*argc + 1) elements, the last one always being
       // NULL.  The following loop moves the trailing NULL element as
       // well.
       for (int j = i; j != *argc; j++) {
         argv[j] = argv[j + 1];
       }
 
       // Decrements the argument count.
       (*argc)--;
 
       // We also need to decrement the iterator as we just removed
       // an element.
       i--;
     }
   }
 }
 
 }  // namespace internal
 
 // Initializes Google Mock.  This must be called before running the
 // tests.  In particular, it parses a command line for the flags that
 // Google Mock recognizes.  Whenever a Google Mock flag is seen, it is
 // removed from argv, and *argc is decremented.
 //
 // No value is returned.  Instead, the Google Mock flag variables are
 // updated.
 //
 // Since Google Test is needed for Google Mock to work, this function
 // also initializes Google Test and parses its flags, if that hasn't
 // been done.
 GTEST_API_ void InitGoogleMock(int* argc, char** argv) {
   internal::InitGoogleMockImpl(argc, argv);
 }
 
 // This overloaded version can be used in Windows programs compiled in
 // UNICODE mode.
 GTEST_API_ void InitGoogleMock(int* argc, wchar_t** argv) {
   internal::InitGoogleMockImpl(argc, argv);
 }
 
 }  // namespace testing

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