codecvt_members.cc revision 103447 
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
39namespace 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 = 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 = 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}
114