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  1. // <system_error> implementation file
  2.  
  3. // Copyright (C) 2007-2013 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. #include <cstring>
  27. #include <system_error>
  28. #include <bits/functexcept.h>
  29. #include <limits>
  30.  
  31. namespace
  32. {
  33.   using std::string;
  34.  
  35.   struct generic_error_category : public std::error_category
  36.   {
  37.     virtual const char*
  38.     name() const noexcept
  39.     { return "generic"; }
  40.  
  41.     virtual string
  42.     message(int i) const
  43.     {
  44.       // XXX locale issues: how does one get or set loc.
  45.       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  46.       return string(strerror(i));
  47.     }
  48.   };
  49.  
  50.   struct system_error_category : public std::error_category
  51.   {
  52.     virtual const char*
  53.     name() const noexcept
  54.     { return "system"; }
  55.  
  56.     virtual string
  57.     message(int i) const
  58.     {
  59.       // XXX locale issues: how does one get or set loc.
  60.       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  61.       return string(strerror(i));
  62.     }
  63.   };
  64.  
  65.   const generic_error_category generic_category_instance{};
  66.   const system_error_category system_category_instance{};
  67. }
  68.  
  69. namespace std _GLIBCXX_VISIBILITY(default)
  70. {
  71. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  72.  
  73.   error_category::error_category() noexcept = default;
  74.  
  75.   error_category::~error_category() noexcept = default;
  76.  
  77.   const error_category&
  78.   system_category() noexcept { return system_category_instance; }
  79.  
  80.   const error_category&
  81.   generic_category() noexcept { return generic_category_instance; }
  82.  
  83.   system_error::~system_error() noexcept = default;
  84.  
  85.   error_condition
  86.   error_category::default_error_condition(int __i) const noexcept
  87.   { return error_condition(__i, *this); }
  88.  
  89.   bool
  90.   error_category::equivalent(int __i,
  91.                              const error_condition& __cond) const noexcept
  92.   { return default_error_condition(__i) == __cond; }
  93.  
  94.   bool
  95.   error_category::equivalent(const error_code& __code, int __i) const noexcept
  96.   { return *this == __code.category() && __code.value() == __i; }
  97.  
  98.   error_condition
  99.   error_code::default_error_condition() const noexcept
  100.   { return category().default_error_condition(value()); }
  101.  
  102. _GLIBCXX_END_NAMESPACE_VERSION
  103. } // namespace
  104.