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Diffstat (limited to 'libstdc++-v3/config/locale/generic/codecvt_members.cc')
| -rw-r--r-- | libstdc++-v3/config/locale/generic/codecvt_members.cc | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/libstdc++-v3/config/locale/generic/codecvt_members.cc b/libstdc++-v3/config/locale/generic/codecvt_members.cc new file mode 100644 index 000000000..f0de79e79 --- /dev/null +++ b/libstdc++-v3/config/locale/generic/codecvt_members.cc @@ -0,0 +1,220 @@ +// std::codecvt implementation details, generic version -*- C++ -*- + +// Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 +// 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 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// 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. + +// 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 <cstdlib> // For MB_CUR_MAX +#include <climits> // For MB_LEN_MAX +#include <cstring> + +namespace std _GLIBCXX_VISIBILITY(default) +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + // Specializations. +#ifdef _GLIBCXX_USE_WCHAR_T + codecvt_base::result + codecvt<wchar_t, char, mbstate_t>:: + do_out(state_type& __state, const intern_type* __from, + const intern_type* __from_end, const intern_type*& __from_next, + extern_type* __to, extern_type* __to_end, + extern_type*& __to_next) const + { + 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); + + // 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 + { + 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++; + } + } + + if (__ret == ok && __from < __from_end) + __ret = partial; + + __from_next = __from; + __to_next = __to; + return __ret; + } + + codecvt_base::result + codecvt<wchar_t, char, mbstate_t>:: + do_in(state_type& __state, const extern_type* __from, + const extern_type* __from_end, const extern_type*& __from_next, + intern_type* __to, intern_type* __to_end, + intern_type*& __to_next) const + { + 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); + + // 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) + { + 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; + } + + // 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) + { + size_t __conv = mbrtowc(0, __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--; + } + + return __ret; + } +#endif + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace |