Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/common/argv.hpp

@@ -0,0 +1,133 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_COMMON_ARGV_H
+#define OPENVPN_COMMON_ARGV_H
+
+#include <cstring>     // memcpy
+
+#include <string>
+#include <vector>
+
+namespace openvpn {
+
+  class Argv : public std::vector<std::string>
+  {
+  public:
+    Argv(const size_t capacity=16)
+    {
+      reserve(capacity);
+    }
+
+    std::string to_string() const
+    {
+      std::string ret;
+      bool first = true;
+      for (const auto &s : *this)
+	{
+	  if (!first)
+	    ret += ' ';
+	  ret += s;
+	  first = false;
+	}
+      return ret;
+    }
+  };
+
+  class ArgvWrapper
+  {
+  public:
+    explicit ArgvWrapper(const std::vector<std::string>& argv)
+    {
+      size_t i;
+      argc = argv.size();
+      cargv = new char *[argc+1];
+      for (i = 0; i < argc; ++i)
+	cargv[i] = string_alloc(argv[i]);
+      cargv[i] = nullptr;
+    }
+
+    ArgvWrapper(ArgvWrapper&& rhs) noexcept
+    {
+      argc = rhs.argc;
+      cargv = rhs.cargv;
+      rhs.argc = 0;
+      rhs.cargv = nullptr;
+    }
+
+    ArgvWrapper& operator=(ArgvWrapper&& rhs) noexcept
+    {
+      del();
+      argc = rhs.argc;
+      cargv = rhs.cargv;
+      rhs.argc = 0;
+      rhs.cargv = nullptr;
+      return *this;
+    }
+
+    ~ArgvWrapper()
+    {
+      del();
+    }
+
+    char *const *c_argv() const noexcept
+    {
+      return cargv;
+    }
+
+    char **c_argv() noexcept
+    {
+      return cargv;
+    }
+
+    size_t c_argc() const noexcept
+    {
+      return argc;
+    }
+
+  private:
+    ArgvWrapper(const ArgvWrapper&) = delete;
+    ArgvWrapper& operator=(const ArgvWrapper&) = delete;
+
+    static char *string_alloc(const std::string& s)
+    {
+      const char *sdata = s.c_str();
+      const size_t slen = s.length();
+      char *ret = new char[slen+1];
+      std::memcpy(ret, sdata, slen);
+      ret[slen] = '\0';
+      return ret;
+    }
+
+    void del()
+    {
+      for (size_t i = 0; i < argc; ++i)
+	delete [] cargv[i];
+      delete [] cargv;
+    }
+
+    size_t argc;
+    char **cargv;
+  };
+
+}
+
+#endif