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Diffstat (limited to 'contrib/libstdc++/src/fstream.cc')
| -rw-r--r-- | contrib/libstdc++/src/fstream.cc | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/contrib/libstdc++/src/fstream.cc b/contrib/libstdc++/src/fstream.cc new file mode 100644 index 0000000..be71133 --- /dev/null +++ b/contrib/libstdc++/src/fstream.cc @@ -0,0 +1,193 @@ +// File based streams -*- C++ -*- + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 +// 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) +// 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. + +// 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. + +// 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. + +// +// ISO C++ 14882: 27.8 File-based streams +// + +#include <fstream> + +namespace std +{ + template<> + basic_filebuf<char>::int_type + basic_filebuf<char>::_M_underflow_common(bool __bump) + { + int_type __ret = traits_type::eof(); + bool __testin = _M_mode & ios_base::in; + bool __testout = _M_mode & ios_base::out; + + if (__testin) + { + // Check for pback madness, and if so swich back to the + // normal buffers and jet outta here before expensive + // fileops happen... + if (_M_pback_init) + { + _M_pback_destroy(); + if (_M_in_cur < _M_in_end) + return traits_type::to_int_type(*_M_in_cur); + } + + // Sync internal and external buffers. + // NB: __testget -> __testput as _M_buf_unified here. + bool __testget = _M_in_cur && _M_in_beg < _M_in_cur; + bool __testinit = _M_is_indeterminate(); + if (__testget) + { + if (__testout) + _M_really_overflow(); + else if (_M_in_cur != _M_filepos) + _M_file.seekoff(_M_in_cur - _M_filepos, + ios_base::cur, ios_base::in); + } + + if (__testinit || __testget) + { + streamsize __elen = 0; + streamsize __ilen = 0; + __elen = _M_file.xsgetn(reinterpret_cast<char*>(_M_in_beg), + _M_buf_size); + __ilen = __elen; + + if (0 < __ilen) + { + _M_set_determinate(__ilen); + if (__testout) + _M_out_cur = _M_in_cur; + __ret = traits_type::to_int_type(*_M_in_cur); + if (__bump) + _M_in_cur_move(1); + else if (_M_buf_size == 1) + { + // If we are synced with stdio, we have to unget the + // character we just read so that the file pointer + // doesn't move. + _M_file.sys_ungetc(traits_type::to_int_type(*_M_in_cur)); + _M_set_indeterminate(); + } + } + } + } + _M_last_overflowed = false; + return __ret; + } + +#ifdef _GLIBCPP_USE_WCHAR_T + template<> + basic_filebuf<wchar_t>::int_type + basic_filebuf<wchar_t>::_M_underflow_common(bool __bump) + { + int_type __ret = traits_type::eof(); + bool __testin = _M_mode & ios_base::in; + bool __testout = _M_mode & ios_base::out; + + if (__testin) + { + // Check for pback madness, and if so swich back to the + // normal buffers and jet outta here before expensive + // fileops happen... + if (_M_pback_init) + { + _M_pback_destroy(); + if (_M_in_cur < _M_in_end) + return traits_type::to_int_type(*_M_in_cur); + } + + // Sync internal and external buffers. + // NB: __testget -> __testput as _M_buf_unified here. + bool __testget = _M_in_cur && _M_in_beg < _M_in_cur; + bool __testinit = _M_is_indeterminate(); + if (__testget) + { + if (__testout) + _M_really_overflow(); + else if (_M_in_cur != _M_filepos) + _M_file.seekoff(_M_in_cur - _M_filepos, + ios_base::cur, ios_base::in); + } + + if (__testinit || __testget) + { + const locale __loc = this->getloc(); + const __codecvt_type& __cvt = use_facet<__codecvt_type>(__loc); + + streamsize __elen = 0; + streamsize __ilen = 0; + if (__cvt.always_noconv()) + { + __elen = _M_file.xsgetn(reinterpret_cast<char*>(_M_in_beg), + _M_buf_size); + __ilen = __elen; + } + else + { + char* __buf = static_cast<char*>(__builtin_alloca(_M_buf_size)); + __elen = _M_file.xsgetn(__buf, _M_buf_size); + + const char* __eend; + char_type* __iend; + __res_type __r = __cvt.in(_M_state_cur, __buf, + __buf + __elen, __eend, _M_in_beg, + _M_in_beg + _M_buf_size, __iend); + if (__r == codecvt_base::ok) + __ilen = __iend - _M_in_beg; + else + { + // Unwind. + __ilen = 0; + _M_file.seekoff(-__elen, ios_base::cur, ios_base::in); + } + } + + if (0 < __ilen) + { + _M_set_determinate(__ilen); + if (__testout) + _M_out_cur = _M_in_cur; + __ret = traits_type::to_int_type(*_M_in_cur); + if (__bump) + _M_in_cur_move(1); + else if (_M_buf_size == 1) + { + // If we are synced with stdio, we have to unget the + // character we just read so that the file pointer + // doesn't move. + _M_file.sys_ungetc(traits_type::to_int_type(*_M_in_cur)); + _M_set_indeterminate(); + } + } + } + } + _M_last_overflowed = false; + return __ret; + } +#endif +} // namespace std |
