libstdc++-v3/src/c++11/system_error.cc

   1 // <system_error> implementation file
   2
   3 // Copyright (C) 2007-2018 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #define _GLIBCXX_USE_CXX11_ABI 1
  27 #define __sso_string __sso_stringxxx
  28 #include <cstring>
  29 #include <system_error>
  30 #include <bits/functexcept.h>
  31 #include <limits>
  32 #undef __sso_string
  33
  34 namespace
  35 {
  36   using std::string;
  37
  38   struct generic_error_category : public std::error_category
  39   {
  40     virtual const char*
  41     name() const noexcept
  42     { return "generic"; }
  43
  44     _GLIBCXX_DEFAULT_ABI_TAG
  45     virtual string
  46     message(int i) const
  47     {
  48       // XXX locale issues: how does one get or set loc.
  49       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  50       return string(strerror(i));
  51     }
  52   };
  53
  54   struct system_error_category : public std::error_category
  55   {
  56     virtual const char*
  57     name() const noexcept
  58     { return "system"; }
  59
  60     _GLIBCXX_DEFAULT_ABI_TAG
  61     virtual string
  62     message(int i) const
  63     {
  64       // XXX locale issues: how does one get or set loc.
  65       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  66       return string(strerror(i));
  67     }
  68   };
  69
  70   const generic_error_category generic_category_instance{};
  71   const system_error_category system_category_instance{};
  72 }
  73
  74 namespace std _GLIBCXX_VISIBILITY(default)
  75 {
  76 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  77
  78   void
  79   __throw_system_error(int __i __attribute__((unused)))
  80   {
  81     _GLIBCXX_THROW_OR_ABORT(system_error(error_code(__i, generic_category())));
  82   }
  83
  84   error_category::~error_category() noexcept = default;
  85
  86   const error_category&
  87   _V2::system_category() noexcept { return system_category_instance; }
  88
  89   const error_category&
  90   _V2::generic_category() noexcept { return generic_category_instance; }
  91
  92   system_error::~system_error() noexcept = default;
  93
  94   error_condition
  95   error_category::default_error_condition(int __i) const noexcept
  96   { return error_condition(__i, *this); }
  97
  98   bool
  99   error_category::equivalent(int __i,
 100                              const error_condition& __cond) const noexcept
 101   { return default_error_condition(__i) == __cond; }
 102
 103   bool
 104   error_category::equivalent(const error_code& __code, int __i) const noexcept
 105   { return *this == __code.category() && __code.value() == __i; }
 106
 107   error_condition
 108   error_code::default_error_condition() const noexcept
 109   { return category().default_error_condition(value()); }
 110
 111 #if _GLIBCXX_USE_CXX11_ABI
 112   // Return error_category::message() as a COW string
 113   __cow_string
 114   error_category::_M_message(int i) const
 115   {
 116     string msg = this->message(i);
 117     return {msg.c_str(), msg.length()};
 118   }
 119 #endif
 120
 121 _GLIBCXX_END_NAMESPACE_VERSION
 122 } // namespace