ceph/src/boost/boost/iostreams/detail/system_failure.hpp

   1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
   2 // (C) Copyright 2005-2007 Jonathan Turkanis
   3 // (C) Copyright Jonathan Graehl 2004.
   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 // See http://www.boost.org/libs/iostreams for documentation.
   8
   9 // Used by mapped_file.cpp.
  10
  11 #ifndef BOOST_IOSTREAMS_DETAIL_SYSTEM_FAILURE_HPP_INCLUDED
  12 #define BOOST_IOSTREAMS_DETAIL_SYSTEM_FAILURE_HPP_INCLUDED
  13
  14 #if defined(_MSC_VER)
  15 # pragma once
  16 #endif
  17
  18 #include <cstring>
  19 #include <string>
  20 #include <boost/config.hpp>
  21 #include <boost/throw_exception.hpp>
  22 #include <boost/iostreams/detail/config/windows_posix.hpp>
  23 #include <boost/iostreams/detail/ios.hpp>  // failure.
  24
  25 #if defined(BOOST_NO_STDC_NAMESPACE) && !defined(__LIBCOMO__)
  26 namespace std { using ::strlen; }
  27 #endif
  28
  29 #ifdef BOOST_IOSTREAMS_WINDOWS
  30 # define WIN32_LEAN_AND_MEAN  // Exclude rarely-used stuff from Windows headers
  31 # include <windows.h>
  32 #else
  33 # include <errno.h>
  34 # include <string.h>
  35 #endif
  36
  37 namespace boost { namespace iostreams { namespace detail {
  38
  39 inline BOOST_IOSTREAMS_FAILURE system_failure(const char* msg)
  40 {
  41     std::string result;
  42 #ifdef BOOST_IOSTREAMS_WINDOWS
  43     DWORD err;
  44     LPVOID lpMsgBuf;
  45     if ( (err = ::GetLastError()) != NO_ERROR &&
  46          ::FormatMessageA( FORMAT_MESSAGE_ALLOCATE_BUFFER |
  47                            FORMAT_MESSAGE_FROM_SYSTEM,
  48                            NULL,
  49                            err,
  50                            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  51                            (LPSTR) &lpMsgBuf,
  52                            0,
  53                            NULL ) != 0 )
  54     {
  55         result.reserve(std::strlen(msg) + 2 + std::strlen((LPSTR)lpMsgBuf));
  56         result.append(msg);
  57         result.append(": ");
  58         result.append((LPSTR) lpMsgBuf);
  59         ::LocalFree(lpMsgBuf);
  60     } else {
  61         result += msg;
  62     }
  63 #else
  64     const char* system_msg = errno ? strerror(errno) : "";
  65     result.reserve(std::strlen(msg) + 2 + std::strlen(system_msg));
  66     result.append(msg);
  67     result.append(": ");
  68     result.append(system_msg);
  69 #endif
  70     return BOOST_IOSTREAMS_FAILURE(result);
  71 }
  72
  73 inline BOOST_IOSTREAMS_FAILURE system_failure(const std::string& msg)
  74 { return system_failure(msg.c_str()); }
  75
  76 inline void throw_system_failure(const char* msg)
  77 { boost::throw_exception(system_failure(msg)); }
  78
  79 inline void throw_system_failure(const std::string& msg)
  80 { boost::throw_exception(system_failure(msg)); }
  81
  82 } } } // End namespaces detail, iostreams, boost.
  83
  84 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_SYSTEM_FAILURE_HPP_INCLUDED