libstdc++-v3/src/system_error.cc

   1 // <system_error> implementation file
   2
   3 // Copyright (C) 2007, 2008
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 #include <cstring>
  32 #include <system_error>
  33 #include <bits/functexcept.h>
  34 #include <limits>
  35
  36 namespace
  37 {
  38   using std::string;
  39
  40   struct gnu_error_category : public std::error_category
  41   {
  42     virtual const char*
  43     name() const
  44     {
  45       const char* s = "GNU";
  46       return s;
  47     }
  48
  49     virtual string
  50     message(int i) const
  51     {
  52       // XXX locale issues: how does one get or set loc.
  53       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  54       return string(strerror(i));
  55     }
  56   };
  57
  58   const gnu_error_category gnu_category;
  59 }
  60
  61 _GLIBCXX_BEGIN_NAMESPACE(std)
  62
  63   const error_category&
  64   get_posix_category() { return gnu_category; }
  65
  66   const error_category&
  67   get_system_category() { return gnu_category; }
  68
  69   system_error::~system_error() throw() { }
  70
  71   error_condition
  72   error_category::default_error_condition(int __i) const
  73   { return error_condition(__i, *this); }
  74
  75   bool
  76   error_category::equivalent(int __i, const error_condition& __cond) const
  77   { return default_error_condition(__i) == __cond; }
  78
  79   bool
  80   error_category::equivalent(const error_code& __code, int __i) const
  81   { return *this == __code.category() && __code.value() == __i; }
  82
  83   error_condition
  84   error_code::default_error_condition() const
  85   { return category().default_error_condition(value()); }
  86
  87 _GLIBCXX_END_NAMESPACE