text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. 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.
   *
   * 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 HOLDER 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.
   */
  
  #include <Kernel/CommandLine.h>
  #include <Kernel/StdLib.h>
  
  namespace Kernel {
  
  static char s_cmd_line[1024];
  static CommandLine* s_the;
  
  void CommandLine::early_initialize(const char* cmd_line)
  {
      if (!cmd_line)
          return;
      size_t length = strlen(cmd_line);
      if (length >= sizeof(s_cmd_line))
          length = sizeof(s_cmd_line) - 1;
      memcpy(s_cmd_line, cmd_line, length);
      s_cmd_line[length] = '\0';
  }
  
  const CommandLine& kernel_command_line()
  {
      ASSERT(s_the);
      return *s_the;
  }
  
  void CommandLine::initialize()
  {
      ASSERT(!s_the);
      s_the = new CommandLine(s_cmd_line);
  }
  
  CommandLine::CommandLine(const String& string)
      : m_string(string)
  {
      s_the = this;
  
      const auto& args = m_string.split(' ');
      m_params.ensure_capacity(args.size());
      for (auto&& str : args) {
          if (str == "") {
              continue;
          }
  
          auto pair = str.split_limit('=', 2);
  
          if (pair.size() == 1) {
              m_params.set(move(pair[0]), "");
          } else {
              m_params.set(move(pair[0]), move(pair[1]));
          }
      }
  }
  
  Optional<String> CommandLine::lookup(const String& key) const
  {
      return m_params.get(key);
  }
  
  bool CommandLine::contains(const String& key) const
  {
      return m_params.contains(key);
  }
  
  }
  