// std::codecvt implementation details, generic version -*- C++ -*-
-// Copyright (C) 2002 Free Software Foundation, Inc.
+// Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009
+// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
//
// ISO C++ 14882: 22.2.1.5 - Template class codecvt
// Written by Benjamin Kosnik <bkoz@redhat.com>
#include <locale>
-#include "c++locale_internal.h"
+#include <cstdlib> // For MB_CUR_MAX
+#include <climits> // For MB_LEN_MAX
+#include <cstring>
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
-namespace std
-{
// Specializations.
-#ifdef _GLIBCPP_USE_WCHAR_T
+#ifdef _GLIBCXX_USE_WCHAR_T
codecvt_base::result
codecvt<wchar_t, char, mbstate_t>::
do_out(state_type& __state, const intern_type* __from,
extern_type* __to, extern_type* __to_end,
extern_type*& __to_next) const
{
- result __ret = error;
- size_t __len = min(__from_end - __from, __to_end - __to);
- size_t __conv = wcsrtombs(__to, &__from, __len, &__state);
+ result __ret = ok;
+ // The conversion must be done using a temporary destination buffer
+ // since it is not possible to pass the size of the buffer to wcrtomb
+ state_type __tmp_state(__state);
- if (__conv == __len)
- {
- __from_next = __from;
- __to_next = __to + __conv;
- __ret = ok;
- }
- else if (__conv > 0 && __conv < __len)
+ // The conversion must be done by calling wcrtomb in a loop rather
+ // than using wcsrtombs because wcsrtombs assumes that the input is
+ // zero-terminated.
+
+ // Either we can upper bound the total number of external characters to
+ // something smaller than __to_end - __to or the conversion must be done
+ // using a temporary destination buffer since it is not possible to
+ // pass the size of the buffer to wcrtomb
+ if (MB_CUR_MAX * (__from_end - __from) - (__to_end - __to) <= 0)
+ while (__from < __from_end)
+ {
+ const size_t __conv = wcrtomb(__to, *__from, &__tmp_state);
+ if (__conv == static_cast<size_t>(-1))
+ {
+ __ret = error;
+ break;
+ }
+ __state = __tmp_state;
+ __to += __conv;
+ __from++;
+ }
+ else
{
- __from_next = __from;
- __to_next = __to + __conv;
- __ret = partial;
+ extern_type __buf[MB_LEN_MAX];
+ while (__from < __from_end && __to < __to_end)
+ {
+ const size_t __conv = wcrtomb(__buf, *__from, &__tmp_state);
+ if (__conv == static_cast<size_t>(-1))
+ {
+ __ret = error;
+ break;
+ }
+ else if (__conv > static_cast<size_t>(__to_end - __to))
+ {
+ __ret = partial;
+ break;
+ }
+
+ memcpy(__to, __buf, __conv);
+ __state = __tmp_state;
+ __to += __conv;
+ __from++;
+ }
}
- else
- __ret = error;
-
+
+ if (__ret == ok && __from < __from_end)
+ __ret = partial;
+
+ __from_next = __from;
+ __to_next = __to;
return __ret;
}
intern_type* __to, intern_type* __to_end,
intern_type*& __to_next) const
{
- result __ret = error;
- size_t __len = min(__from_end - __from, __to_end - __to);
- size_t __conv = mbsrtowcs(__to, &__from, __len, &__state);
+ result __ret = ok;
+ // This temporary state object is neccessary so __state won't be modified
+ // if [__from, __from_end) is a partial multibyte character.
+ state_type __tmp_state(__state);
- if (__conv == __len)
+ // Conversion must be done by calling mbrtowc in a loop rather than
+ // by calling mbsrtowcs because mbsrtowcs assumes that the input
+ // sequence is zero-terminated.
+ while (__from < __from_end && __to < __to_end)
{
- __from_next = __from;
- __to_next = __to + __conv;
- __ret = ok;
+ size_t __conv = mbrtowc(__to, __from, __from_end - __from,
+ &__tmp_state);
+ if (__conv == static_cast<size_t>(-1))
+ {
+ __ret = error;
+ break;
+ }
+ else if (__conv == static_cast<size_t>(-2))
+ {
+ // It is unclear what to return in this case (see DR 382).
+ __ret = partial;
+ break;
+ }
+ else if (__conv == 0)
+ {
+ // XXX Probably wrong for stateful encodings
+ __conv = 1;
+ *__to = L'\0';
+ }
+
+ __state = __tmp_state;
+ __to++;
+ __from += __conv;
}
- else if (__conv > 0 && __conv < __len)
+
+ // It is not clear that __from < __from_end implies __ret != ok
+ // (see DR 382).
+ if (__ret == ok && __from < __from_end)
+ __ret = partial;
+
+ __from_next = __from;
+ __to_next = __to;
+ return __ret;
+ }
+
+ int
+ codecvt<wchar_t, char, mbstate_t>::
+ do_encoding() const throw()
+ {
+ // XXX This implementation assumes that the encoding is
+ // stateless and is either single-byte or variable-width.
+ int __ret = 0;
+ if (MB_CUR_MAX == 1)
+ __ret = 1;
+ return __ret;
+ }
+
+ int
+ codecvt<wchar_t, char, mbstate_t>::
+ do_max_length() const throw()
+ {
+ // XXX Probably wrong for stateful encodings.
+ int __ret = MB_CUR_MAX;
+ return __ret;
+ }
+
+ int
+ codecvt<wchar_t, char, mbstate_t>::
+ do_length(state_type& __state, const extern_type* __from,
+ const extern_type* __end, size_t __max) const
+ {
+ int __ret = 0;
+ state_type __tmp_state(__state);
+
+ while (__from < __end && __max)
{
- __from_next = __from;
- __to_next = __to + __conv;
- __ret = partial;
+ size_t __conv = mbrtowc(NULL, __from, __end - __from, &__tmp_state);
+ if (__conv == static_cast<size_t>(-1))
+ {
+ // Invalid source character
+ break;
+ }
+ else if (__conv == static_cast<size_t>(-2))
+ {
+ // Remainder of input does not form a complete destination
+ // character.
+ break;
+ }
+ else if (__conv == 0)
+ {
+ // XXX Probably wrong for stateful encodings
+ __conv = 1;
+ }
+
+ __state = __tmp_state;
+ __from += __conv;
+ __ret += __conv;
+ __max--;
}
- else
- __ret = error;
-
+
return __ret;
}
#endif
-}
+
+_GLIBCXX_END_NAMESPACE
projects / msp430-gcc.git / blobdiff