author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 14:06:43 +0300 | |
changeset 22 | ddc455616bd6 |
parent 0 | e4d67989cc36 |
child 45 | 4b03adbd26ca |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 1996,1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_FSTREAM_C |
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#define _STLP_FSTREAM_C |
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|
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#ifndef _STLP_INTERNAL_FSTREAM_H |
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# include <stl/_fstream.h> |
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#endif |
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#ifndef _STLP_INTERNAL_LIMITS |
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# include <stl/_limits.h> |
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#endif |
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_STLP_BEGIN_NAMESPACE |
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# if defined ( _STLP_NESTED_TYPE_PARAM_BUG ) |
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// no wchar_t is supported for this mode |
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# define __BF_int_type__ int |
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# define __BF_pos_type__ streampos |
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# define __BF_off_type__ streamoff |
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# else |
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# define __BF_int_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::int_type |
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# define __BF_pos_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::pos_type |
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# define __BF_off_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::off_type |
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# endif |
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|
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|
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//---------------------------------------------------------------------- |
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// Public basic_filebuf<> member functions |
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|
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template <class _CharT, class _Traits> |
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basic_filebuf<_CharT, _Traits>::basic_filebuf() |
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: basic_streambuf<_CharT, _Traits>(), _M_base(), |
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_M_constant_width(false), _M_always_noconv(false), |
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_M_int_buf_dynamic(false), |
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_M_in_input_mode(false), _M_in_output_mode(false), |
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_M_in_error_mode(false), _M_in_putback_mode(false), |
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_M_int_buf(0), _M_int_buf_EOS(0), |
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_M_ext_buf(0), _M_ext_buf_EOS(0), |
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_M_ext_buf_converted(0), _M_ext_buf_end(0), |
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_M_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)), |
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_M_end_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)), |
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_M_mmap_base(0), _M_mmap_len(0), |
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_M_saved_eback(0), _M_saved_gptr(0), _M_saved_egptr(0), |
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_M_codecvt(0), |
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_M_width(1), _M_max_width(1) |
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{ |
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this->_M_setup_codecvt(locale(), false); |
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} |
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template <class _CharT, class _Traits> |
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basic_filebuf<_CharT, _Traits>* |
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basic_filebuf<_CharT, _Traits>::close() { |
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bool __ok = this->is_open(); |
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if (_M_in_output_mode) { |
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__ok = __ok && !_Traits::eq_int_type(this->overflow(traits_type::eof()), |
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traits_type::eof()); |
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__ok == __ok && this->_M_unshift(); |
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} |
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else if (_M_in_input_mode) |
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this->_M_exit_input_mode(); |
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// Note order of arguments. We close the file even if __ok is false. |
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__ok = _M_base._M_close() && __ok; |
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// Restore the initial state, except that we don't deallocate the buffer |
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// or mess with the cached codecvt information. |
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_M_state = _M_end_state = _State_type(); |
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_M_ext_buf_converted = _M_ext_buf_end = 0; |
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_M_mmap_base = 0; |
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_M_mmap_len = 0; |
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this->setg(0, 0, 0); |
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this->setp(0, 0); |
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_M_saved_eback = _M_saved_gptr = _M_saved_egptr = 0; |
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_M_in_input_mode = _M_in_output_mode = _M_in_error_mode = _M_in_putback_mode |
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= false; |
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return __ok ? this : 0; |
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} |
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101 |
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// This member function is called whenever we exit input mode. |
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// It unmaps the memory-mapped file, if any, and sets |
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// _M_in_input_mode to false. |
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template <class _CharT, class _Traits> |
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void basic_filebuf<_CharT, _Traits>::_M_exit_input_mode() { |
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if (_M_mmap_base != 0) |
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_M_base._M_unmap(_M_mmap_base, _M_mmap_len); |
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_M_in_input_mode = false; |
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_M_mmap_base = 0; |
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} |
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112 |
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113 |
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114 |
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//---------------------------------------------------------------------- |
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// basic_filebuf<> helper functions. |
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117 |
|
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//---------------------------------------- |
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// Helper functions for switching between modes. |
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120 |
|
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// This member function is called if we're performing the first I/O |
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// operation on a filebuf, or if we're performing an input operation |
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// immediately after a seek. |
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template <class _CharT, class _Traits> |
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bool basic_filebuf<_CharT, _Traits>::_M_switch_to_input_mode() { |
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if (this->is_open() && (((int)_M_base.__o_mode() & (int)ios_base::in) != 0) |
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&& (_M_in_output_mode == 0) && (_M_in_error_mode == 0)) { |
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if (!_M_int_buf && !_M_allocate_buffers()) |
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return false; |
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130 |
|
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_M_ext_buf_converted = _M_ext_buf; |
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_M_ext_buf_end = _M_ext_buf; |
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133 |
|
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_M_end_state = _M_state; |
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135 |
|
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_M_in_input_mode = true; |
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return true; |
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} |
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139 |
|
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return false; |
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} |
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142 |
|
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143 |
|
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144 |
// This member function is called if we're performing the first I/O |
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// operation on a filebuf, or if we're performing an output operation |
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// immediately after a seek. |
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template <class _CharT, class _Traits> |
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bool basic_filebuf<_CharT, _Traits>::_M_switch_to_output_mode() { |
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if (this->is_open() && (_M_base.__o_mode() & (int)ios_base::out) && |
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_M_in_input_mode == 0 && _M_in_error_mode == 0) { |
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151 |
|
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if (!_M_int_buf && !_M_allocate_buffers()) |
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return false; |
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154 |
|
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// In append mode, every write does an implicit seek to the end |
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// of the file. Whenever leaving output mode, the end of file |
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// get put in the initial shift state. |
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if (_M_base.__o_mode() & ios_base::app) |
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_M_state = _State_type(); |
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160 |
|
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this->setp(_M_int_buf, _M_int_buf_EOS - 1); |
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_M_in_output_mode = true; |
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return true; |
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} |
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165 |
|
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return false; |
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} |
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168 |
|
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169 |
|
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//---------------------------------------- |
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// Helper functions for input |
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172 |
|
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// This member function is called if there is an error during input. |
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// It puts the filebuf in error mode, clear the get area buffer, and |
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// returns eof. |
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// returns eof. Error mode is sticky; it is cleared only by close or |
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// seek. |
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178 |
|
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template <class _CharT, class _Traits> |
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__BF_int_type__ |
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basic_filebuf<_CharT, _Traits>::_M_input_error() { |
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this->_M_exit_input_mode(); |
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_M_in_output_mode = false; |
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_M_in_error_mode = true; |
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this->setg(0, 0, 0); |
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return traits_type::eof(); |
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} |
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188 |
|
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template <class _CharT, class _Traits> |
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__BF_int_type__ |
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basic_filebuf<_CharT, _Traits>::_M_underflow_aux() { |
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// We have the state and file position from the end of the internal |
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// buffer. This round, they become the beginning of the internal buffer. |
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_M_state = _M_end_state; |
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195 |
|
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// Fill the external buffer. Start with any leftover characters that |
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// didn't get converted last time. |
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if (_M_ext_buf_end > _M_ext_buf_converted) |
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199 |
|
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_M_ext_buf_end = copy(_M_ext_buf_converted, _M_ext_buf_end, _M_ext_buf); |
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201 |
// boris : copy_backward did not work |
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//_M_ext_buf_end = copy_backward(_M_ext_buf_converted, _M_ext_buf_end, |
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203 |
//_M_ext_buf+ (_M_ext_buf_end - _M_ext_buf_converted)); |
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else |
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_M_ext_buf_end = _M_ext_buf; |
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206 |
|
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// Now fill the external buffer with characters from the file. This is |
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// a loop because occasionally we don't get enough external characters |
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// to make progress. |
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for (;;) { |
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ptrdiff_t __n = _M_base._M_read(_M_ext_buf_end, _M_ext_buf_EOS - _M_ext_buf_end); |
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212 |
|
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// Don't enter error mode for a failed read. Error mode is sticky, |
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// and we might succeed if we try again. |
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if (__n <= 0) |
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return traits_type::eof(); |
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217 |
|
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// Convert the external buffer to internal characters. |
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_M_ext_buf_end += __n; |
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const char* __enext; |
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_CharT* __inext; |
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222 |
|
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typename _Codecvt::result __status |
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= _M_codecvt->in(_M_end_state, |
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_M_ext_buf, _M_ext_buf_end, __enext, |
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_M_int_buf, _M_int_buf_EOS, __inext); |
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227 |
|
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// Error conditions: (1) Return value of error. (2) Producing internal |
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// characters without consuming external characters. (3) In fixed-width |
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// encodings, producing an internal sequence whose length is inconsistent |
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// with that of the internal sequence. (4) Failure to produce any |
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// characters if we have enough characters in the external buffer, where |
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// "enough" means the largest possible width of a single character. |
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if (__status == _Codecvt::noconv) |
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return _Noconv_input<_Traits>::_M_doit(this); |
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else if (__status == _Codecvt::error || |
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(__inext != _M_int_buf && __enext == _M_ext_buf) || |
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(_M_constant_width && |
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// __inext - _M_int_buf != _M_width * (__enext - _M_ext_buf)) || |
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(__inext - _M_int_buf) * _M_width != (__enext - _M_ext_buf)) || |
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(__inext == _M_int_buf && __enext - _M_ext_buf >= _M_max_width)) |
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return _M_input_error(); |
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else if (__inext != _M_int_buf) { |
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_M_ext_buf_converted = _M_ext_buf + (__enext - _M_ext_buf); |
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this->setg(_M_int_buf, _M_int_buf, __inext); |
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return traits_type::to_int_type(*_M_int_buf); |
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} |
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// We need to go around the loop again to get more external characters. |
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} |
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} |
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|
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//---------------------------------------- |
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// Helper functions for output |
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254 |
|
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// This member function is called if there is an error during output. |
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// It puts the filebuf in error mode, clear the put area buffer, and |
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// returns eof. Error mode is sticky; it is cleared only by close or |
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// seek. |
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template <class _CharT, class _Traits> |
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__BF_int_type__ |
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basic_filebuf<_CharT, _Traits>::_M_output_error() { |
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_M_in_output_mode = false; |
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_M_in_input_mode = false; |
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_M_in_error_mode = true; |
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this->setp(0, 0); |
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return traits_type::eof(); |
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} |
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268 |
|
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269 |
|
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// Write whatever sequence of characters is necessary to get back to |
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// the initial shift state. This function overwrites the external |
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// buffer, changes the external file position, and changes the state. |
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// Precondition: the internal buffer is empty. |
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template <class _CharT, class _Traits> |
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bool basic_filebuf<_CharT, _Traits>::_M_unshift() { |
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if (_M_in_output_mode && !_M_constant_width) { |
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typename _Codecvt::result __status; |
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do { |
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char* __enext = _M_ext_buf; |
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__status = _M_codecvt->unshift(_M_state, |
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_M_ext_buf, _M_ext_buf_EOS, __enext); |
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if (__status == _Codecvt::noconv || |
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(__enext == _M_ext_buf && __status == _Codecvt::ok)) |
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return true; |
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else if (__status == _Codecvt::error) |
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return false; |
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else if (!_M_write(_M_ext_buf, __enext - _M_ext_buf)) |
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return false; |
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} while (__status == _Codecvt::partial); |
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} |
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|
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return true; |
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} |
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|
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|
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//---------------------------------------- |
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// Helper functions for buffer allocation and deallocation |
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298 |
|
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// This member function is called when we're initializing a filebuf's |
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// internal and external buffers. The argument is the size of the |
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// internal buffer; the external buffer is sized using the character |
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// width in the current encoding. Preconditions: the buffers are currently |
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// null. __n >= 1. __buf is either a null pointer or a pointer to an |
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304 |
// array show size is at least __n. |
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|
305 |
|
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306 |
// We need __n >= 1 for two different reasons. For input, the base |
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307 |
// class always needs a buffer because of the semantics of underflow(). |
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308 |
// For output, we want to have an internal buffer that's larger by one |
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309 |
// element than the buffer that the base class knows about. (See |
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|
310 |
// basic_filebuf<>::overflow() for the reason.) |
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311 |
template <class _CharT, class _Traits> |
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312 |
bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers(_CharT* __buf, streamsize __n) { |
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|
313 |
//The major hypothesis in the following implementation is that size_t is unsigned. |
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314 |
//We also need streamsize byte representation to be larger or equal to the int |
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315 |
//representation to correctly store the encoding information. |
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|
316 |
_STLP_STATIC_ASSERT(!numeric_limits<size_t>::is_signed && |
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317 |
sizeof(streamsize) >= sizeof(int)) |
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|
318 |
|
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|
319 |
if (__buf == 0) { |
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|
320 |
streamsize __bufsize = __n * sizeof(_CharT); |
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|
321 |
//We first check that the streamsize representation can't overflow a size_t one. |
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322 |
//If it can, we check that __bufsize is not higher than the size_t max value. |
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|
323 |
if ((sizeof(streamsize) > sizeof(size_t)) && |
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324 |
(__bufsize > __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()))) |
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|
325 |
return false; |
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|
326 |
_M_int_buf = __STATIC_CAST(_CharT*, malloc(__STATIC_CAST(size_t, __bufsize))); |
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|
327 |
if (!_M_int_buf) |
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|
328 |
return false; |
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|
329 |
_M_int_buf_dynamic = true; |
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330 |
} |
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|
331 |
else { |
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|
332 |
_M_int_buf = __buf; |
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|
333 |
_M_int_buf_dynamic = false; |
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|
334 |
} |
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|
335 |
|
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|
336 |
streamsize __ebufsiz = (max)(__n * __STATIC_CAST(streamsize, _M_width), |
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|
337 |
__STATIC_CAST(streamsize, _M_codecvt->max_length())); |
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|
338 |
_M_ext_buf = 0; |
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|
339 |
if ((sizeof(streamsize) < sizeof(size_t)) || |
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|
340 |
((sizeof(streamsize) == sizeof(size_t)) && numeric_limits<streamsize>::is_signed) || |
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|
341 |
(__ebufsiz <= __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()))) { |
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|
342 |
_M_ext_buf = __STATIC_CAST(char*, malloc(__STATIC_CAST(size_t, __ebufsiz))); |
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|
343 |
} |
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|
344 |
|
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|
345 |
if (!_M_ext_buf) { |
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|
346 |
_M_deallocate_buffers(); |
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|
347 |
return false; |
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|
348 |
} |
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|
349 |
|
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|
350 |
_M_int_buf_EOS = _M_int_buf + __STATIC_CAST(ptrdiff_t, __n); |
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|
351 |
_M_ext_buf_EOS = _M_ext_buf + __STATIC_CAST(ptrdiff_t, __ebufsiz); |
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|
352 |
return true; |
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|
353 |
} |
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|
354 |
|
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|
355 |
// Abbreviation for the most common case. |
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356 |
template <class _CharT, class _Traits> |
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|
357 |
bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers() { |
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|
358 |
// Choose a buffer that's at least 4096 characters long and that's a |
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|
359 |
// multiple of the page size. |
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|
360 |
streamsize __default_bufsiz = |
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|
361 |
((_M_base.__page_size() + 4095UL) / _M_base.__page_size()) * _M_base.__page_size(); |
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|
362 |
return _M_allocate_buffers(0, __default_bufsiz); |
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|
363 |
} |
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|
364 |
|
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|
365 |
template <class _CharT, class _Traits> |
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|
366 |
void basic_filebuf<_CharT, _Traits>::_M_deallocate_buffers() { |
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|
367 |
if (_M_int_buf_dynamic) |
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|
368 |
free(_M_int_buf); |
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|
369 |
free(_M_ext_buf); |
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|
370 |
_M_int_buf = 0; |
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|
371 |
_M_int_buf_EOS = 0; |
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|
372 |
_M_ext_buf = 0; |
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|
373 |
_M_ext_buf_EOS = 0; |
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|
374 |
} |
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|
375 |
|
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|
376 |
|
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|
377 |
//---------------------------------------- |
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|
378 |
// Helper functiosn for seek and imbue |
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|
379 |
|
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|
380 |
template <class _CharT, class _Traits> |
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|
381 |
bool basic_filebuf<_CharT, _Traits>::_M_seek_init(bool __do_unshift) { |
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|
382 |
// If we're in error mode, leave it. |
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|
383 |
_M_in_error_mode = false; |
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|
384 |
|
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|
385 |
// Flush the output buffer if we're in output mode, and (conditionally) |
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|
386 |
// emit an unshift sequence. |
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|
387 |
if (_M_in_output_mode) { |
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|
388 |
bool __ok = !traits_type::eq_int_type(this->overflow(traits_type::eof()), |
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|
389 |
traits_type::eof()); |
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|
390 |
if (__do_unshift) |
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|
391 |
__ok = __ok && this->_M_unshift(); |
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|
392 |
if (!__ok) { |
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|
393 |
_M_in_output_mode = false; |
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|
394 |
_M_in_error_mode = true; |
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|
395 |
this->setp(0, 0); |
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|
396 |
return false; |
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|
397 |
} |
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|
398 |
} |
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|
399 |
|
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Revision: 201002
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|
400 |
// Discard putback characters, if any. |
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|
401 |
if (_M_in_input_mode && _M_in_putback_mode) |
e4d67989cc36
Revision: 201002
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|
402 |
_M_exit_putback_mode(); |
e4d67989cc36
Revision: 201002
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|
403 |
|
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Revision: 201002
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|
404 |
return true; |
e4d67989cc36
Revision: 201002
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} |
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/* Change the filebuf's locale. This member function has no effect |
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* unless it is called before any I/O is performed on the stream. |
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* This function is called on construction and on an imbue call. In the |
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* case of the construction the codecvt facet might be a custom one if |
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* the basic_filebuf user has instanciate it with a custom char_traits. |
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* The user will have to call imbue before any I/O operation. |
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*/ |
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template <class _CharT, class _Traits> |
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void basic_filebuf<_CharT, _Traits>::_M_setup_codecvt(const locale& __loc, bool __on_imbue) { |
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if (has_facet<_Codecvt>(__loc)) { |
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_M_codecvt = &use_facet<_Codecvt>(__loc) ; |
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int __encoding = _M_codecvt->encoding(); |
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|
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_M_width = (max)(__encoding, 1); |
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_M_max_width = _M_codecvt->max_length(); |
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_M_constant_width = __encoding > 0; |
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_M_always_noconv = _M_codecvt->always_noconv(); |
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} |
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else { |
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_M_codecvt = 0; |
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_M_width = _M_max_width = 1; |
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_M_constant_width = _M_always_noconv = false; |
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if (__on_imbue) { |
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//This call will generate an exception reporting the problem. |
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use_facet<_Codecvt>(__loc); |
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} |
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} |
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} |
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|
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_STLP_END_NAMESPACE |
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|
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# undef __BF_int_type__ |
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# undef __BF_pos_type__ |
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# undef __BF_off_type__ |
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|
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#endif /* _STLP_FSTREAM_C */ |
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|
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// Local Variables: |
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// mode:C++ |
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// End: |