How to use the cpplint._cpplint_state.error_count function in cpplint

# Use the strictest verbosity level for cpplint.py (level 1) which is the
  # default when running cpplint.py from command line.
  # To make it possible to work with not-yet-converted code, we're only applying
  # it to new (or moved/renamed) files and files listed in LINT_FOLDERS.
  verbosity_level = 1
  files = []
  for f in input_api.AffectedSourceFiles(source_file_filter):
    # Note that moved/renamed files also count as added for svn.
    if (f.Action() == 'A'):
      files.append(f.AbsoluteLocalPath())

  for file_name in files:
    cpplint.ProcessFile(file_name, verbosity_level)

  if cpplint._cpplint_state.error_count > 0:
    if input_api.is_committing:
      # TODO(kjellander): Change back to PresubmitError below when we're
      # confident with the lint settings.
      res_type = output_api.PresubmitPromptWarning
    else:
      res_type = output_api.PresubmitPromptWarning
    result = [res_type('Changelist failed cpplint.py check.')]

  return result

white_regex = re.compile(settings.GetLintRegex())
    black_regex = re.compile(settings.GetLintIgnoreRegex())
    extra_check_functions = [cpplint_chromium.CheckPointerDeclarationWhitespace]
    for filename in filenames:
      if white_regex.match(filename):
        if black_regex.match(filename):
          print "Ignoring file %s" % filename
        else:
          cpplint.ProcessFile(filename, cpplint._cpplint_state.verbose_level,
                              extra_check_functions)
      else:
        print "Skipping file %s" % filename
  finally:
    os.chdir(previous_cwd)
  print "Total errors found: %d\n" % cpplint._cpplint_state.error_count
  if cpplint._cpplint_state.error_count != 0:
    return 1
  return 0

cpplint._IsTestFilename = _ourIsTestFilename

    # Change stderr to write with replacement characters so we don't die
    # if we try to print something containing non-ASCII characters.
    sys.stderr = codecs.StreamReaderWriter(sys.stderr,
                                           codecs.getreader('utf8'),
                                           codecs.getwriter('utf8'),
                                           'replace')
    
    cpplint._cpplint_state.ResetErrorCounts()
    for filename in filenames:
        cpplint.ProcessFile(filename, cpplint._cpplint_state.verbose_level)
    cpplint._cpplint_state.PrintErrorCounts()
    
    return cpplint._cpplint_state.error_count == 0

black_list = DEFAULT_LINT_BLACKLIST_REGEX
  black_regex = re.compile(black_list)

  extra_check_functions = [cpplint_chromium.CheckPointerDeclarationWhitespace]

  for filename in filenames:
    if white_regex.match(filename):
      if black_regex.match(filename):
        print "Ignoring file %s" % filename
      else:
        cpplint.ProcessFile(filename, cpplint._cpplint_state.verbose_level,
                            extra_check_functions)
    else:
      print "Skipping file %s" % filename

  print "Total errors found: %d\n" % cpplint._cpplint_state.error_count
  return 1

white_regex = re.compile(settings.GetLintRegex())
    black_regex = re.compile(settings.GetLintIgnoreRegex())
    extra_check_functions = [cpplint_chromium.CheckPointerDeclarationWhitespace]
    for filename in filenames:
      if white_regex.match(filename):
        if black_regex.match(filename):
          print('Ignoring file %s' % filename)
        else:
          cpplint.ProcessFile(filename, cpplint._cpplint_state.verbose_level,
                              extra_check_functions)
      else:
        print('Skipping file %s' % filename)
  finally:
    os.chdir(previous_cwd)
  print('Total errors found: %d\n' % cpplint._cpplint_state.error_count)
  if cpplint._cpplint_state.error_count != 0:
    return 1
  return 0

black_list = DEFAULT_LINT_IGNORE_REGEX
    black_regex = re.compile(black_list)
    extra_check_functions = [cpplint_chromium.CheckPointerDeclarationWhitespace]
    for filename in filenames:
      if white_regex.match(filename):
        if black_regex.match(filename):
          print "Ignoring file %s" % filename
        else:
          cpplint.ProcessFile(filename, cpplint._cpplint_state.verbose_level,
                              extra_check_functions)
      else:
        print "Skipping file %s" % filename
  finally:
    os.chdir(previous_cwd)

  print "Total errors found: %d\n" % cpplint._cpplint_state.error_count
  return 1

# is well documented it seems to be used in error quite often. To avoid
      # problems we disallow the direct use of memcpy.  The exceptions are in
      # third-party code and in platform/globals.h which uses it to implement
      # bit_cast and bit_copy.
      if not filename.endswith(os.path.join('platform', 'globals.h')) and \
         filename.find('third_party') == -1:
        fh = open(filename, 'r')
        content = fh.read()
        match = re.search('\\bmemcpy\\b', content)
        if match:
          line_number = content[0:match.start()].count('\n') + 1
          print "%s:%d: use of memcpy is forbidden" % (filename, line_number)
          memcpy_match_count += 1

  # Report a presubmit error if any of the files had an error.
  if cpplint._cpplint_state.error_count > 0 or memcpy_match_count > 0:
    result = [output_api.PresubmitError('Failed cpplint check.')]
  return result

# Use the strictest verbosity level for cpplint.py (level 1) which is the
  # default when running cpplint.py from command line. To make it possible to
  # work with not-yet-converted code, we're only applying it to new (or
  # moved/renamed) files and files not listed in CPPLINT_BLACKLIST.
  verbosity_level = 1
  files = []
  for f in input_api.AffectedSourceFiles(source_file_filter):
    # Note that moved/renamed files also count as added.
    if f.Action() == 'A' or not IsLintBlacklisted(blacklist_paths,
                                                  f.LocalPath()):
      files.append(f.AbsoluteLocalPath())

  for file_name in files:
    cpplint.ProcessFile(file_name, verbosity_level)

  if cpplint._cpplint_state.error_count > 0:
    if input_api.is_committing:
      res_type = output_api.PresubmitError
    else:
      res_type = output_api.PresubmitPromptWarning
    result = [res_type('Changelist failed cpplint.py check.')]

  return result