ceph/src/boost/boost/process/detail/windows/locale.hpp

   1 // Copyright (c) 2016 Klemens D. Morgenstern
   2 // Copyright (c) 2008 Beman Dawes
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_PROCESS_DETAIL_WINDOWS_LOCALE_HPP_
   8 #define BOOST_PROCESS_DETAIL_WINDOWS_LOCALE_HPP_
   9
  10 #include <locale>
  11 #include <boost/core/ignore_unused.hpp>
  12 #include <boost/winapi/file_management.hpp>
  13 #include <boost/winapi/character_code_conversion.hpp>
  14
  15 namespace boost
  16 {
  17 namespace process
  18 {
  19 namespace detail
  20 {
  21 namespace windows
  22 {
  23
  24 //copied from boost.filesystem
  25 class windows_file_codecvt
  26    : public std::codecvt< wchar_t, char, std::mbstate_t >
  27  {
  28  public:
  29    explicit windows_file_codecvt(std::size_t refs = 0)
  30        : std::codecvt<wchar_t, char, std::mbstate_t>(refs) {}
  31  protected:
  32
  33    bool do_always_noconv() const noexcept override { return false; }
  34
  35    //  seems safest to assume variable number of characters since we don't
  36    //  actually know what codepage is active
  37    int do_encoding() const noexcept override { return 0; }
  38
  39    std::codecvt_base::result do_in(std::mbstate_t& state,
  40      const char* from, const char* from_end, const char*& from_next,
  41      wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const override
  42    {
  43      boost::ignore_unused(state);
  44
  45        auto codepage =
  46 #if !defined(BOOST_NO_ANSI_APIS)
  47                ::boost::winapi::AreFileApisANSI() ?
  48                ::boost::winapi::CP_ACP_ :
  49 #endif
  50                ::boost::winapi::CP_OEMCP_;
  51
  52      int count = 0;
  53      if ((count = ::boost::winapi::MultiByteToWideChar(codepage,
  54              ::boost::winapi::MB_PRECOMPOSED_, from,
  55        static_cast<int>(from_end - from), to, static_cast<int>(to_end - to))) == 0)
  56      {
  57        return error;  // conversion failed
  58      }
  59
  60      from_next = from_end;
  61      to_next = to + count;
  62      *to_next = L'\0';
  63      return ok;
  64   }
  65
  66    std::codecvt_base::result do_out(std::mbstate_t & state,
  67      const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next,
  68      char* to, char* to_end, char*& to_next) const override
  69    {
  70      boost::ignore_unused(state);
  71      auto codepage =
  72 #if !defined(BOOST_NO_ANSI_APIS)
  73                    ::boost::winapi::AreFileApisANSI() ?
  74                        ::boost::winapi::CP_ACP_ :
  75 #endif
  76                      ::boost::winapi::CP_OEMCP_;
  77      int count = 0;
  78
  79
  80      if ((count = ::boost::winapi::WideCharToMultiByte(codepage,
  81                    ::boost::winapi::WC_NO_BEST_FIT_CHARS_, from,
  82                   static_cast<int>(from_end - from), to, static_cast<int>(to_end - to), 0, 0)) == 0)
  83      {
  84        return error;  // conversion failed
  85      }
  86
  87      from_next = from_end;
  88      to_next = to + count;
  89      *to_next = '\0';
  90      return ok;
  91    }
  92
  93    std::codecvt_base::result do_unshift(std::mbstate_t&,
  94        char* /*from*/, char* /*to*/, char* & /*next*/) const override { return ok; }
  95
  96    int do_length(std::mbstate_t&,
  97      const char* /*from*/, const char* /*from_end*/, std::size_t /*max*/) const override { return 0; }
  98
  99    int do_max_length() const noexcept override { return 0; }
 100  };
 101
 102
 103
 104 }
 105 }
 106 }
 107 }
 108
 109
 110
 111 #endif /* BOOST_PROCESS_LOCALE_HPP_ */