libstdc++-v3/config/locale/gnu/codecvt_members.cc

   1 // std::codecvt implementation details, GNU version -*- C++ -*-
   2
   3 // Copyright (C) 2002 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 22.2.1.5 - Template class codecvt
  32 //
  33
  34 // Written by Benjamin Kosnik <bkoz@redhat.com>
  35
  36 #include <locale>
  37 #include "c++locale_internal.h"
  38
  39 namespace std
  40 {
  41   // Specializations.
  42 #ifdef _GLIBCPP_USE_WCHAR_T
  43   codecvt_base::result
  44   codecvt<wchar_t, char, mbstate_t>::
  45   do_out(state_type& __state, const intern_type* __from,
  46          const intern_type* __from_end, const intern_type*& __from_next,
  47          extern_type* __to, extern_type* __to_end,
  48          extern_type*& __to_next) const
  49   {
  50     result __ret = error;
  51     size_t __len = std::min(__from_end - __from, __to_end - __to);
  52 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  53     __c_locale __old = __uselocale(_M_c_locale_codecvt);
  54 #endif
  55     size_t __conv = wcsrtombs(__to, &__from, __len, &__state);
  56 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  57     __uselocale(__old);
  58 #endif
  59
  60     if (__conv == __len)
  61       {
  62         __from_next = __from;
  63         __to_next = __to + __conv;
  64         __ret = ok;
  65       }
  66     else if (__conv > 0 && __conv < __len)
  67       {
  68         __from_next = __from;
  69         __to_next = __to + __conv;
  70         __ret = partial;
  71       }
  72     else
  73       __ret = error;
  74
  75     return __ret;
  76   }
  77
  78   codecvt_base::result
  79   codecvt<wchar_t, char, mbstate_t>::
  80   do_in(state_type& __state, const extern_type* __from,
  81         const extern_type* __from_end, const extern_type*& __from_next,
  82         intern_type* __to, intern_type* __to_end,
  83         intern_type*& __to_next) const
  84   {
  85     result __ret = error;
  86     size_t __len = std::min(__from_end - __from, __to_end - __to);
  87 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  88     __c_locale __old = __uselocale(_M_c_locale_codecvt);
  89 #endif
  90     size_t __conv = mbsrtowcs(__to, &__from, __len, &__state);
  91 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
  92     __uselocale(__old);
  93 #endif
  94
  95     if (__conv == __len)
  96       {
  97         __from_next = __from;
  98         __to_next = __to + __conv;
  99         __ret = ok;
 100       }
 101     else if (__conv > 0 && __conv < __len)
 102       {
 103         __from_next = __from;
 104         __to_next = __to + __conv;
 105         __ret = partial;
 106       }
 107     else
 108       __ret = error;
 109
 110     return __ret;
 111   }
 112 #endif
 113 }