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<a href="a00882.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// File based streams -*- C++ -*-</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="comment">// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,</span>
<a name="l00004"></a>00004 <span class="comment">// 2007, 2008, 2009, 2010, 2011</span>
<a name="l00005"></a>00005 <span class="comment">// Free Software Foundation, Inc.</span>
<a name="l00006"></a>00006 <span class="comment">//</span>
<a name="l00007"></a>00007 <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span>
<a name="l00008"></a>00008 <span class="comment">// software; you can redistribute it and/or modify it under the</span>
<a name="l00009"></a>00009 <span class="comment">// terms of the GNU General Public License as published by the</span>
<a name="l00010"></a>00010 <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00011"></a>00011 <span class="comment">// any later version.</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="comment">// This library is distributed in the hope that it will be useful,</span>
<a name="l00014"></a>00014 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00015"></a>00015 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00016"></a>00016 <span class="comment">// GNU General Public License for more details.</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span>
<a name="l00019"></a>00019 <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span>
<a name="l00020"></a>00020 <span class="comment">// 3.1, as published by the Free Software Foundation.</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">// You should have received a copy of the GNU General Public License and</span>
<a name="l00023"></a>00023 <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span>
<a name="l00024"></a>00024 <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span>
<a name="l00025"></a>00025 <span class="comment">// <http://www.gnu.org/licenses/>.</span>
<a name="l00026"></a>00026 <span class="comment"></span>
<a name="l00027"></a>00027 <span class="comment">/** @file bits/fstream.tcc</span>
<a name="l00028"></a>00028 <span class="comment"> * This is an internal header file, included by other library headers.</span>
<a name="l00029"></a>00029 <span class="comment"> * Do not attempt to use it directly. @headername{fstream}</span>
<a name="l00030"></a>00030 <span class="comment"> */</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">//</span>
<a name="l00033"></a>00033 <span class="comment">// ISO C++ 14882: 27.8 File-based streams</span>
<a name="l00034"></a>00034 <span class="comment">//</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#ifndef _FSTREAM_TCC</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor">#define _FSTREAM_TCC 1</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span>
<a name="l00039"></a>00039 <span class="preprocessor">#pragma GCC system_header</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="preprocessor">#include <<a class="code" href="a00849.html">bits/cxxabi_forced.h</a>></span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="keyword">namespace </span>std _GLIBCXX_VISIBILITY(default)
<a name="l00044"></a>00044 {
<a name="l00045"></a>00045 _GLIBCXX_BEGIN_NAMESPACE_VERSION
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00048"></a>00048 <span class="keywordtype">void</span>
<a name="l00049"></a>00049 basic_filebuf<_CharT, _Traits>::
<a name="l00050"></a>00050 _M_allocate_internal_buffer()
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 <span class="comment">// Allocate internal buffer only if one doesn't already exist</span>
<a name="l00053"></a>00053 <span class="comment">// (either allocated or provided by the user via setbuf).</span>
<a name="l00054"></a>00054 <span class="keywordflow">if</span> (!_M_buf_allocated && !_M_buf)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 _M_buf = <span class="keyword">new</span> char_type[_M_buf_size];
<a name="l00057"></a>00057 _M_buf_allocated = <span class="keyword">true</span>;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00062"></a>00062 <span class="keywordtype">void</span>
<a name="l00063"></a>00063 basic_filebuf<_CharT, _Traits>::
<a name="l00064"></a>00064 _M_destroy_internal_buffer() throw()
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 <span class="keywordflow">if</span> (_M_buf_allocated)
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 <span class="keyword">delete</span> [] _M_buf;
<a name="l00069"></a>00069 _M_buf = 0;
<a name="l00070"></a>00070 _M_buf_allocated = <span class="keyword">false</span>;
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 <span class="keyword">delete</span> [] _M_ext_buf;
<a name="l00073"></a>00073 _M_ext_buf = 0;
<a name="l00074"></a>00074 _M_ext_buf_size = 0;
<a name="l00075"></a>00075 _M_ext_next = 0;
<a name="l00076"></a>00076 _M_ext_end = 0;
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00080"></a>00080 <a class="code" href="a00247.html#add2d16a8965c490cd9b4cc95b958e09f" title="Does not open any files.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00081"></a><a class="code" href="a00247.html#add2d16a8965c490cd9b4cc95b958e09f">00081</a> <a class="code" href="a00247.html#add2d16a8965c490cd9b4cc95b958e09f" title="Does not open any files."> basic_filebuf</a>() : <a class="code" href="a00252.html">__streambuf_type</a>(), _M_lock(), _M_file(&_M_lock),
<a name="l00082"></a>00082 _M_mode(<a class="code" href="a00528.html" title="The base of the I/O class hierarchy.This class defines everything that can be defined about I/O that ...">ios_base</a>::openmode(0)), _M_state_beg(), _M_state_cur(),
<a name="l00083"></a>00083 _M_state_last(), _M_buf(0), _M_buf_size(BUFSIZ),
<a name="l00084"></a>00084 _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_pback(),
<a name="l00085"></a>00085 _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false),
<a name="l00086"></a>00086 _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0),
<a name="l00087"></a>00087 _M_ext_end(0)
<a name="l00088"></a>00088 {
<a name="l00089"></a>00089 <span class="keywordflow">if</span> (has_facet<__codecvt_type>(this-><a class="code" href="a00252.html#aef4d5a82b6a51fa750fa43d80b4a8564" title="Current locale setting.">_M_buf_locale</a>))
<a name="l00090"></a>00090 _M_codecvt = &use_facet<__codecvt_type>(this-><a class="code" href="a00252.html#aef4d5a82b6a51fa750fa43d80b4a8564" title="Current locale setting.">_M_buf_locale</a>);
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00094"></a>00094 <span class="keyword">typename</span> <a class="code" href="a00247.html">basic_filebuf<_CharT, _Traits>::__filebuf_type</a>*
<a name="l00095"></a>00095 <a class="code" href="a00247.html#ad72dc61561f4420b36f9e626b4426433" title="Opens an external file.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00096"></a><a class="code" href="a00247.html#ad72dc61561f4420b36f9e626b4426433">00096</a> <a class="code" href="a00247.html#ad72dc61561f4420b36f9e626b4426433" title="Opens an external file."> open</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* __s, ios_base::openmode __mode)
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 <a class="code" href="a00247.html">__filebuf_type</a> *__ret = 0;
<a name="l00099"></a>00099 <span class="keywordflow">if</span> (!this->is_open())
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101 _M_file.<a class="code" href="a00247.html#ad72dc61561f4420b36f9e626b4426433" title="Opens an external file.">open</a>(__s, __mode);
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (this->is_open())
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 _M_allocate_internal_buffer();
<a name="l00105"></a>00105 _M_mode = __mode;
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="comment">// Setup initial buffer to 'uncommitted' mode.</span>
<a name="l00108"></a>00108 _M_reading = <span class="keyword">false</span>;
<a name="l00109"></a>00109 _M_writing = <span class="keyword">false</span>;
<a name="l00110"></a>00110 _M_set_buffer(-1);
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">// Reset to initial state.</span>
<a name="l00113"></a>00113 _M_state_last = _M_state_cur = _M_state_beg;
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">// 27.8.1.3,4</span>
<a name="l00116"></a>00116 <span class="keywordflow">if</span> ((__mode & <a class="code" href="a00528.html#ad22225874e26210dfe11263279587e75" title="Open and seek to end immediately after opening.">ios_base::ate</a>)
<a name="l00117"></a>00117 && this->seekoff(0, <a class="code" href="a00528.html#a505c3780386ccd5ca9679f7264db97f9" title="Request a seek relative to the current end of the sequence.">ios_base::end</a>, __mode)
<a name="l00118"></a>00118 == <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1)))
<a name="l00119"></a>00119 this->close();
<a name="l00120"></a>00120 <span class="keywordflow">else</span>
<a name="l00121"></a>00121 __ret = <span class="keyword">this</span>;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 }
<a name="l00124"></a>00124 <span class="keywordflow">return</span> __ret;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00128"></a>00128 <span class="keyword">typename</span> <a class="code" href="a00247.html">basic_filebuf<_CharT, _Traits>::__filebuf_type</a>*
<a name="l00129"></a>00129 <a class="code" href="a00247.html#a5e13a128abb0a5dd8ef1e3d10597031f" title="Closes the currently associated file.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00130"></a><a class="code" href="a00247.html#a5e13a128abb0a5dd8ef1e3d10597031f">00130</a> <a class="code" href="a00247.html#a5e13a128abb0a5dd8ef1e3d10597031f" title="Closes the currently associated file."> close</a>()
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 <span class="keywordflow">if</span> (!this->is_open())
<a name="l00133"></a>00133 <span class="keywordflow">return</span> 0;
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="keywordtype">bool</span> __testfail = <span class="keyword">false</span>;
<a name="l00136"></a>00136 {
<a name="l00137"></a>00137 <span class="comment">// NB: Do this here so that re-opened filebufs will be cool...</span>
<a name="l00138"></a>00138 <span class="keyword">struct </span>__close_sentry
<a name="l00139"></a>00139 {
<a name="l00140"></a>00140 <a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf</a> *__fb;
<a name="l00141"></a>00141 __close_sentry (<a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf</a> *__fbi): __fb(__fbi) { }
<a name="l00142"></a>00142 ~__close_sentry ()
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144 __fb->_M_mode = ios_base::openmode(0);
<a name="l00145"></a>00145 __fb->_M_pback_init = <span class="keyword">false</span>;
<a name="l00146"></a>00146 __fb->_M_destroy_internal_buffer();
<a name="l00147"></a>00147 __fb->_M_reading = <span class="keyword">false</span>;
<a name="l00148"></a>00148 __fb->_M_writing = <span class="keyword">false</span>;
<a name="l00149"></a>00149 __fb->_M_set_buffer(-1);
<a name="l00150"></a>00150 __fb->_M_state_last = __fb->_M_state_cur = __fb->_M_state_beg;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 } __cs (<span class="keyword">this</span>);
<a name="l00153"></a>00153
<a name="l00154"></a>00154 __try
<a name="l00155"></a>00155 {
<a name="l00156"></a>00156 <span class="keywordflow">if</span> (!_M_terminate_output())
<a name="l00157"></a>00157 __testfail = <span class="keyword">true</span>;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 __catch(<a class="code" href="a00004.html" title="Thrown as part of forced unwinding.A magic placeholder class that can be caught by reference to recog...">__cxxabiv1::__forced_unwind</a>&)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 _M_file.close();
<a name="l00162"></a>00162 __throw_exception_again;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 __catch(...)
<a name="l00165"></a>00165 { __testfail = <span class="keyword">true</span>; }
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keywordflow">if</span> (!_M_file.close())
<a name="l00169"></a>00169 __testfail = <span class="keyword">true</span>;
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (__testfail)
<a name="l00172"></a>00172 <span class="keywordflow">return</span> 0;
<a name="l00173"></a>00173 <span class="keywordflow">else</span>
<a name="l00174"></a>00174 <span class="keywordflow">return</span> <span class="keyword">this</span>;
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00178"></a>00178 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a>
<a name="l00179"></a>00179 <a class="code" href="a00247.html#a0e8e4218ba9766e34b74e69b17fb28b3" title="Investigating the data available.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00180"></a><a class="code" href="a00247.html#a0e8e4218ba9766e34b74e69b17fb28b3">00180</a> <a class="code" href="a00247.html#a0e8e4218ba9766e34b74e69b17fb28b3" title="Investigating the data available."> showmanyc</a>()
<a name="l00181"></a>00181 {
<a name="l00182"></a>00182 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ret = -1;
<a name="l00183"></a>00183 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & <a class="code" href="a00528.html#a652e2323949eea3d906e1c81bd8ce8f7" title="Open for input. Default for ifstream and fstream.">ios_base::in</a>;
<a name="l00184"></a>00184 <span class="keywordflow">if</span> (__testin && this->is_open())
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 <span class="comment">// For a stateful encoding (-1) the pending sequence might be just</span>
<a name="l00187"></a>00187 <span class="comment">// shift and unshift prefixes with no actual character.</span>
<a name="l00188"></a>00188 __ret = this->egptr() - this->gptr();
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="preprocessor">#if _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM</span>
<a name="l00191"></a>00191 <span class="preprocessor"></span> <span class="comment">// About this workaround, see libstdc++/20806.</span>
<a name="l00192"></a>00192 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testbinary = _M_mode & <a class="code" href="a00528.html#a88a28f18badafdd8e605841b8b7042d5" title="Perform input and output in binary mode (as opposed to text mode). This is probably not what you thin...">ios_base::binary</a>;
<a name="l00193"></a>00193 <span class="keywordflow">if</span> (__check_facet(_M_codecvt).encoding() >= 0
<a name="l00194"></a>00194 && __testbinary)
<a name="l00195"></a>00195 <span class="preprocessor">#else</span>
<a name="l00196"></a>00196 <span class="preprocessor"></span> <span class="keywordflow">if</span> (__check_facet(_M_codecvt).encoding() >= 0)
<a name="l00197"></a>00197 <span class="preprocessor">#endif</span>
<a name="l00198"></a>00198 <span class="preprocessor"></span> __ret += _M_file.showmanyc() / _M_codecvt->max_length();
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="keywordflow">return</span> __ret;
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202
<a name="l00203"></a>00203 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00204"></a>00204 <span class="keyword">typename</span> <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">basic_filebuf<_CharT, _Traits>::int_type</a>
<a name="l00205"></a>00205 <a class="code" href="a00247.html#a051ec9d0aa68d3bbf3a2b8cb2e41c93b" title="Fetches more data from the controlled sequence.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00206"></a><a class="code" href="a00247.html#a051ec9d0aa68d3bbf3a2b8cb2e41c93b">00206</a> <a class="code" href="a00247.html#a051ec9d0aa68d3bbf3a2b8cb2e41c93b" title="Fetches more data from the controlled sequence."> underflow</a>()
<a name="l00207"></a>00207 {
<a name="l00208"></a>00208 <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __ret = traits_type::eof();
<a name="l00209"></a>00209 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & <a class="code" href="a00528.html#a652e2323949eea3d906e1c81bd8ce8f7" title="Open for input. Default for ifstream and fstream.">ios_base::in</a>;
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (__testin)
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 <span class="keywordflow">if</span> (_M_writing)
<a name="l00213"></a>00213 {
<a name="l00214"></a>00214 <span class="keywordflow">if</span> (overflow() == traits_type::eof())
<a name="l00215"></a>00215 <span class="keywordflow">return</span> __ret;
<a name="l00216"></a>00216 _M_set_buffer(-1);
<a name="l00217"></a>00217 _M_writing = <span class="keyword">false</span>;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219 <span class="comment">// Check for pback madness, and if so switch back to the</span>
<a name="l00220"></a>00220 <span class="comment">// normal buffers and jet outta here before expensive</span>
<a name="l00221"></a>00221 <span class="comment">// fileops happen...</span>
<a name="l00222"></a>00222 _M_destroy_pback();
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keywordflow">if</span> (this->gptr() < this->egptr())
<a name="l00225"></a>00225 <span class="keywordflow">return</span> traits_type::to_int_type(*this->gptr());
<a name="l00226"></a>00226
<a name="l00227"></a>00227 <span class="comment">// Get and convert input sequence.</span>
<a name="l00228"></a>00228 <span class="keyword">const</span> <span class="keywordtype">size_t</span> __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">// Will be set to true if ::read() returns 0 indicating EOF.</span>
<a name="l00231"></a>00231 <span class="keywordtype">bool</span> __got_eof = <span class="keyword">false</span>;
<a name="l00232"></a>00232 <span class="comment">// Number of internal characters produced.</span>
<a name="l00233"></a>00233 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ilen = 0;
<a name="l00234"></a>00234 codecvt_base::result __r = codecvt_base::ok;
<a name="l00235"></a>00235 <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())
<a name="l00236"></a>00236 {
<a name="l00237"></a>00237 __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()),
<a name="l00238"></a>00238 __buflen);
<a name="l00239"></a>00239 <span class="keywordflow">if</span> (__ilen == 0)
<a name="l00240"></a>00240 __got_eof = <span class="keyword">true</span>;
<a name="l00241"></a>00241 }
<a name="l00242"></a>00242 <span class="keywordflow">else</span>
<a name="l00243"></a>00243 {
<a name="l00244"></a>00244 <span class="comment">// Worst-case number of external bytes.</span>
<a name="l00245"></a>00245 <span class="comment">// XXX Not done encoding() == -1.</span>
<a name="l00246"></a>00246 <span class="keyword">const</span> <span class="keywordtype">int</span> __enc = _M_codecvt->encoding();
<a name="l00247"></a>00247 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __blen; <span class="comment">// Minimum buffer size.</span>
<a name="l00248"></a>00248 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __rlen; <span class="comment">// Number of chars to read.</span>
<a name="l00249"></a>00249 <span class="keywordflow">if</span> (__enc > 0)
<a name="l00250"></a>00250 __blen = __rlen = __buflen * __enc;
<a name="l00251"></a>00251 <span class="keywordflow">else</span>
<a name="l00252"></a>00252 {
<a name="l00253"></a>00253 __blen = __buflen + _M_codecvt->max_length() - 1;
<a name="l00254"></a>00254 __rlen = __buflen;
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __remainder = _M_ext_end - _M_ext_next;
<a name="l00257"></a>00257 __rlen = __rlen > __remainder ? __rlen - __remainder : 0;
<a name="l00258"></a>00258
<a name="l00259"></a>00259 <span class="comment">// An imbue in 'read' mode implies first converting the external</span>
<a name="l00260"></a>00260 <span class="comment">// chars already present.</span>
<a name="l00261"></a>00261 <span class="keywordflow">if</span> (_M_reading && this->egptr() == this->eback() && __remainder)
<a name="l00262"></a>00262 __rlen = 0;
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="comment">// Allocate buffer if necessary and move unconverted</span>
<a name="l00265"></a>00265 <span class="comment">// bytes to front.</span>
<a name="l00266"></a>00266 <span class="keywordflow">if</span> (_M_ext_buf_size < __blen)
<a name="l00267"></a>00267 {
<a name="l00268"></a>00268 <span class="keywordtype">char</span>* __buf = <span class="keyword">new</span> <span class="keywordtype">char</span>[__blen];
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (__remainder)
<a name="l00270"></a>00270 __builtin_memcpy(__buf, _M_ext_next, __remainder);
<a name="l00271"></a>00271
<a name="l00272"></a>00272 <span class="keyword">delete</span> [] _M_ext_buf;
<a name="l00273"></a>00273 _M_ext_buf = __buf;
<a name="l00274"></a>00274 _M_ext_buf_size = __blen;
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__remainder)
<a name="l00277"></a>00277 __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
<a name="l00278"></a>00278
<a name="l00279"></a>00279 _M_ext_next = _M_ext_buf;
<a name="l00280"></a>00280 _M_ext_end = _M_ext_buf + __remainder;
<a name="l00281"></a>00281 _M_state_last = _M_state_cur;
<a name="l00282"></a>00282
<a name="l00283"></a>00283 <span class="keywordflow">do</span>
<a name="l00284"></a>00284 {
<a name="l00285"></a>00285 <span class="keywordflow">if</span> (__rlen > 0)
<a name="l00286"></a>00286 {
<a name="l00287"></a>00287 <span class="comment">// Sanity check!</span>
<a name="l00288"></a>00288 <span class="comment">// This may fail if the return value of</span>
<a name="l00289"></a>00289 <span class="comment">// codecvt::max_length() is bogus.</span>
<a name="l00290"></a>00290 <span class="keywordflow">if</span> (_M_ext_end - _M_ext_buf + __rlen > _M_ext_buf_size)
<a name="l00291"></a>00291 {
<a name="l00292"></a>00292 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span>
<a name="l00293"></a>00293 <span class="stringliteral">"codecvt::max_length() "</span>
<a name="l00294"></a>00294 <span class="stringliteral">"is not valid"</span>));
<a name="l00295"></a>00295 }
<a name="l00296"></a>00296 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __elen = _M_file.xsgetn(_M_ext_end, __rlen);
<a name="l00297"></a>00297 <span class="keywordflow">if</span> (__elen == 0)
<a name="l00298"></a>00298 __got_eof = <span class="keyword">true</span>;
<a name="l00299"></a>00299 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__elen == -1)
<a name="l00300"></a>00300 <span class="keywordflow">break</span>;
<a name="l00301"></a>00301 _M_ext_end += __elen;
<a name="l00302"></a>00302 }
<a name="l00303"></a>00303
<a name="l00304"></a>00304 <a class="code" href="a00247.html#aa966e9fb8cb5ec6c681f671858d84861">char_type</a>* __iend = this->eback();
<a name="l00305"></a>00305 <span class="keywordflow">if</span> (_M_ext_next < _M_ext_end)
<a name="l00306"></a>00306 __r = _M_codecvt->in(_M_state_cur, _M_ext_next,
<a name="l00307"></a>00307 _M_ext_end, _M_ext_next,
<a name="l00308"></a>00308 this->eback(),
<a name="l00309"></a>00309 this->eback() + __buflen, __iend);
<a name="l00310"></a>00310 <span class="keywordflow">if</span> (__r == codecvt_base::noconv)
<a name="l00311"></a>00311 {
<a name="l00312"></a>00312 <span class="keywordtype">size_t</span> __avail = _M_ext_end - _M_ext_buf;
<a name="l00313"></a>00313 __ilen = <a class="code" href="a01184.html#ga49f0c87cb0e1bf950f5c2d49aa106573" title="This does what you think it does.">std::min</a>(__avail, __buflen);
<a name="l00314"></a>00314 traits_type::copy(this->eback(),
<a name="l00315"></a>00315 reinterpret_cast<char_type*>
<a name="l00316"></a>00316 (_M_ext_buf), __ilen);
<a name="l00317"></a>00317 _M_ext_next = _M_ext_buf + __ilen;
<a name="l00318"></a>00318 }
<a name="l00319"></a>00319 <span class="keywordflow">else</span>
<a name="l00320"></a>00320 __ilen = __iend - this->eback();
<a name="l00321"></a>00321
<a name="l00322"></a>00322 <span class="comment">// _M_codecvt->in may return error while __ilen > 0: this is</span>
<a name="l00323"></a>00323 <span class="comment">// ok, and actually occurs in case of mixed encodings (e.g.,</span>
<a name="l00324"></a>00324 <span class="comment">// XML files).</span>
<a name="l00325"></a>00325 <span class="keywordflow">if</span> (__r == codecvt_base::error)
<a name="l00326"></a>00326 <span class="keywordflow">break</span>;
<a name="l00327"></a>00327
<a name="l00328"></a>00328 __rlen = 1;
<a name="l00329"></a>00329 }
<a name="l00330"></a>00330 <span class="keywordflow">while</span> (__ilen == 0 && !__got_eof);
<a name="l00331"></a>00331 }
<a name="l00332"></a>00332
<a name="l00333"></a>00333 <span class="keywordflow">if</span> (__ilen > 0)
<a name="l00334"></a>00334 {
<a name="l00335"></a>00335 _M_set_buffer(__ilen);
<a name="l00336"></a>00336 _M_reading = <span class="keyword">true</span>;
<a name="l00337"></a>00337 __ret = traits_type::to_int_type(*this->gptr());
<a name="l00338"></a>00338 }
<a name="l00339"></a>00339 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__got_eof)
<a name="l00340"></a>00340 {
<a name="l00341"></a>00341 <span class="comment">// If the actual end of file is reached, set 'uncommitted'</span>
<a name="l00342"></a>00342 <span class="comment">// mode, thus allowing an immediate write without an</span>
<a name="l00343"></a>00343 <span class="comment">// intervening seek.</span>
<a name="l00344"></a>00344 _M_set_buffer(-1);
<a name="l00345"></a>00345 _M_reading = <span class="keyword">false</span>;
<a name="l00346"></a>00346 <span class="comment">// However, reaching it while looping on partial means that</span>
<a name="l00347"></a>00347 <span class="comment">// the file has got an incomplete character.</span>
<a name="l00348"></a>00348 <span class="keywordflow">if</span> (__r == codecvt_base::partial)
<a name="l00349"></a>00349 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span>
<a name="l00350"></a>00350 <span class="stringliteral">"incomplete character in file"</span>));
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::error)
<a name="l00353"></a>00353 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span>
<a name="l00354"></a>00354 <span class="stringliteral">"invalid byte sequence in file"</span>));
<a name="l00355"></a>00355 <span class="keywordflow">else</span>
<a name="l00356"></a>00356 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span>
<a name="l00357"></a>00357 <span class="stringliteral">"error reading the file"</span>));
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359 <span class="keywordflow">return</span> __ret;
<a name="l00360"></a>00360 }
<a name="l00361"></a>00361
<a name="l00362"></a>00362 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00363"></a>00363 <span class="keyword">typename</span> <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">basic_filebuf<_CharT, _Traits>::int_type</a>
<a name="l00364"></a>00364 <a class="code" href="a00247.html#a98e6cafd6256f907c4fff74afa49be3e" title="Tries to back up the input sequence.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00365"></a><a class="code" href="a00247.html#a98e6cafd6256f907c4fff74afa49be3e">00365</a> <a class="code" href="a00247.html#a98e6cafd6256f907c4fff74afa49be3e" title="Tries to back up the input sequence."> pbackfail</a>(<a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __i)
<a name="l00366"></a>00366 {
<a name="l00367"></a>00367 <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __ret = traits_type::eof();
<a name="l00368"></a>00368 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & <a class="code" href="a00528.html#a652e2323949eea3d906e1c81bd8ce8f7" title="Open for input. Default for ifstream and fstream.">ios_base::in</a>;
<a name="l00369"></a>00369 <span class="keywordflow">if</span> (__testin)
<a name="l00370"></a>00370 {
<a name="l00371"></a>00371 <span class="keywordflow">if</span> (_M_writing)
<a name="l00372"></a>00372 {
<a name="l00373"></a>00373 <span class="keywordflow">if</span> (overflow() == traits_type::eof())
<a name="l00374"></a>00374 <span class="keywordflow">return</span> __ret;
<a name="l00375"></a>00375 _M_set_buffer(-1);
<a name="l00376"></a>00376 _M_writing = <span class="keyword">false</span>;
<a name="l00377"></a>00377 }
<a name="l00378"></a>00378 <span class="comment">// Remember whether the pback buffer is active, otherwise below</span>
<a name="l00379"></a>00379 <span class="comment">// we may try to store in it a second char (libstdc++/9761).</span>
<a name="l00380"></a>00380 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testpb = _M_pback_init;
<a name="l00381"></a>00381 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testeof = traits_type::eq_int_type(__i, __ret);
<a name="l00382"></a>00382 <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __tmp;
<a name="l00383"></a>00383 <span class="keywordflow">if</span> (this->eback() < this->gptr())
<a name="l00384"></a>00384 {
<a name="l00385"></a>00385 this->gbump(-1);
<a name="l00386"></a>00386 __tmp = traits_type::to_int_type(*this->gptr());
<a name="l00387"></a>00387 }
<a name="l00388"></a>00388 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (this->seekoff(-1, <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a>) != <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1)))
<a name="l00389"></a>00389 {
<a name="l00390"></a>00390 __tmp = this->underflow();
<a name="l00391"></a>00391 <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, __ret))
<a name="l00392"></a>00392 <span class="keywordflow">return</span> __ret;
<a name="l00393"></a>00393 }
<a name="l00394"></a>00394 <span class="keywordflow">else</span>
<a name="l00395"></a>00395 {
<a name="l00396"></a>00396 <span class="comment">// At the beginning of the buffer, need to make a</span>
<a name="l00397"></a>00397 <span class="comment">// putback position available. But the seek may fail</span>
<a name="l00398"></a>00398 <span class="comment">// (f.i., at the beginning of a file, see</span>
<a name="l00399"></a>00399 <span class="comment">// libstdc++/9439) and in that case we return</span>
<a name="l00400"></a>00400 <span class="comment">// traits_type::eof().</span>
<a name="l00401"></a>00401 <span class="keywordflow">return</span> __ret;
<a name="l00402"></a>00402 }
<a name="l00403"></a>00403
<a name="l00404"></a>00404 <span class="comment">// Try to put back __i into input sequence in one of three ways.</span>
<a name="l00405"></a>00405 <span class="comment">// Order these tests done in is unspecified by the standard.</span>
<a name="l00406"></a>00406 <span class="keywordflow">if</span> (!__testeof && traits_type::eq_int_type(__i, __tmp))
<a name="l00407"></a>00407 __ret = __i;
<a name="l00408"></a>00408 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__testeof)
<a name="l00409"></a>00409 __ret = traits_type::not_eof(__i);
<a name="l00410"></a>00410 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!__testpb)
<a name="l00411"></a>00411 {
<a name="l00412"></a>00412 _M_create_pback();
<a name="l00413"></a>00413 _M_reading = <span class="keyword">true</span>;
<a name="l00414"></a>00414 *this->gptr() = traits_type::to_char_type(__i);
<a name="l00415"></a>00415 __ret = __i;
<a name="l00416"></a>00416 }
<a name="l00417"></a>00417 }
<a name="l00418"></a>00418 <span class="keywordflow">return</span> __ret;
<a name="l00419"></a>00419 }
<a name="l00420"></a>00420
<a name="l00421"></a>00421 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00422"></a>00422 <span class="keyword">typename</span> <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">basic_filebuf<_CharT, _Traits>::int_type</a>
<a name="l00423"></a>00423 <a class="code" href="a00247.html#ac1941000c0d1480052cc8ee84fd8a665" title="Consumes data from the buffer; writes to the controlled sequence.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00424"></a><a class="code" href="a00247.html#ac1941000c0d1480052cc8ee84fd8a665">00424</a> <a class="code" href="a00247.html#ac1941000c0d1480052cc8ee84fd8a665" title="Consumes data from the buffer; writes to the controlled sequence."> overflow</a>(<a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __c)
<a name="l00425"></a>00425 {
<a name="l00426"></a>00426 <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __ret = traits_type::eof();
<a name="l00427"></a>00427 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testeof = traits_type::eq_int_type(__c, __ret);
<a name="l00428"></a>00428 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testout = _M_mode & <a class="code" href="a00528.html#a7187e216e5d16ec820ea1791002f85e0" title="Open for output. Default for ofstream and fstream.">ios_base::out</a>;
<a name="l00429"></a>00429 <span class="keywordflow">if</span> (__testout)
<a name="l00430"></a>00430 {
<a name="l00431"></a>00431 <span class="keywordflow">if</span> (_M_reading)
<a name="l00432"></a>00432 {
<a name="l00433"></a>00433 _M_destroy_pback();
<a name="l00434"></a>00434 <span class="keyword">const</span> <span class="keywordtype">int</span> __gptr_off = _M_get_ext_pos(_M_state_last);
<a name="l00435"></a>00435 <span class="keywordflow">if</span> (_M_seek(__gptr_off, <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a>, _M_state_last)
<a name="l00436"></a>00436 == <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1)))
<a name="l00437"></a>00437 <span class="keywordflow">return</span> __ret;
<a name="l00438"></a>00438 }
<a name="l00439"></a>00439 <span class="keywordflow">if</span> (this->pbase() < this->pptr())
<a name="l00440"></a>00440 {
<a name="l00441"></a>00441 <span class="comment">// If appropriate, append the overflow char.</span>
<a name="l00442"></a>00442 <span class="keywordflow">if</span> (!__testeof)
<a name="l00443"></a>00443 {
<a name="l00444"></a>00444 *this->pptr() = traits_type::to_char_type(__c);
<a name="l00445"></a>00445 this->pbump(1);
<a name="l00446"></a>00446 }
<a name="l00447"></a>00447
<a name="l00448"></a>00448 <span class="comment">// Convert pending sequence to external representation,</span>
<a name="l00449"></a>00449 <span class="comment">// and output.</span>
<a name="l00450"></a>00450 <span class="keywordflow">if</span> (_M_convert_to_external(this->pbase(),
<a name="l00451"></a>00451 this->pptr() - this->pbase()))
<a name="l00452"></a>00452 {
<a name="l00453"></a>00453 _M_set_buffer(0);
<a name="l00454"></a>00454 __ret = traits_type::not_eof(__c);
<a name="l00455"></a>00455 }
<a name="l00456"></a>00456 }
<a name="l00457"></a>00457 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_buf_size > 1)
<a name="l00458"></a>00458 {
<a name="l00459"></a>00459 <span class="comment">// Overflow in 'uncommitted' mode: set _M_writing, set</span>
<a name="l00460"></a>00460 <span class="comment">// the buffer to the initial 'write' mode, and put __c</span>
<a name="l00461"></a>00461 <span class="comment">// into the buffer.</span>
<a name="l00462"></a>00462 _M_set_buffer(0);
<a name="l00463"></a>00463 _M_writing = <span class="keyword">true</span>;
<a name="l00464"></a>00464 <span class="keywordflow">if</span> (!__testeof)
<a name="l00465"></a>00465 {
<a name="l00466"></a>00466 *this->pptr() = traits_type::to_char_type(__c);
<a name="l00467"></a>00467 this->pbump(1);
<a name="l00468"></a>00468 }
<a name="l00469"></a>00469 __ret = traits_type::not_eof(__c);
<a name="l00470"></a>00470 }
<a name="l00471"></a>00471 <span class="keywordflow">else</span>
<a name="l00472"></a>00472 {
<a name="l00473"></a>00473 <span class="comment">// Unbuffered.</span>
<a name="l00474"></a>00474 <a class="code" href="a00247.html#aa966e9fb8cb5ec6c681f671858d84861">char_type</a> __conv = traits_type::to_char_type(__c);
<a name="l00475"></a>00475 <span class="keywordflow">if</span> (__testeof || _M_convert_to_external(&__conv, 1))
<a name="l00476"></a>00476 {
<a name="l00477"></a>00477 _M_writing = <span class="keyword">true</span>;
<a name="l00478"></a>00478 __ret = traits_type::not_eof(__c);
<a name="l00479"></a>00479 }
<a name="l00480"></a>00480 }
<a name="l00481"></a>00481 }
<a name="l00482"></a>00482 <span class="keywordflow">return</span> __ret;
<a name="l00483"></a>00483 }
<a name="l00484"></a>00484
<a name="l00485"></a>00485 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00486"></a>00486 <span class="keywordtype">bool</span>
<a name="l00487"></a>00487 <a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00488"></a>00488 <a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque..."> _M_convert_to_external</a>(_CharT* __ibuf, <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ilen)
<a name="l00489"></a>00489 {
<a name="l00490"></a>00490 <span class="comment">// Sizes of external and pending output.</span>
<a name="l00491"></a>00491 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __elen;
<a name="l00492"></a>00492 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __plen;
<a name="l00493"></a>00493 <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())
<a name="l00494"></a>00494 {
<a name="l00495"></a>00495 __elen = _M_file.<a class="code" href="a00247.html#a9e78a1d5dec2c7eea816ada4e43d7576" title="Multiple character insertion.">xsputn</a>(reinterpret_cast<char*>(__ibuf), __ilen);
<a name="l00496"></a>00496 __plen = __ilen;
<a name="l00497"></a>00497 }
<a name="l00498"></a>00498 <span class="keywordflow">else</span>
<a name="l00499"></a>00499 {
<a name="l00500"></a>00500 <span class="comment">// Worst-case number of external bytes needed.</span>
<a name="l00501"></a>00501 <span class="comment">// XXX Not done encoding() == -1.</span>
<a name="l00502"></a>00502 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __blen = __ilen * _M_codecvt->max_length();
<a name="l00503"></a>00503 <span class="keywordtype">char</span>* __buf = <span class="keyword">static_cast<</span><span class="keywordtype">char</span>*<span class="keyword">></span>(__builtin_alloca(__blen));
<a name="l00504"></a>00504
<a name="l00505"></a>00505 <span class="keywordtype">char</span>* __bend;
<a name="l00506"></a>00506 <span class="keyword">const</span> char_type* __iend;
<a name="l00507"></a>00507 codecvt_base::result __r;
<a name="l00508"></a>00508 __r = _M_codecvt->out(_M_state_cur, __ibuf, __ibuf + __ilen,
<a name="l00509"></a>00509 __iend, __buf, __buf + __blen, __bend);
<a name="l00510"></a>00510
<a name="l00511"></a>00511 <span class="keywordflow">if</span> (__r == codecvt_base::ok || __r == codecvt_base::partial)
<a name="l00512"></a>00512 __blen = __bend - __buf;
<a name="l00513"></a>00513 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::noconv)
<a name="l00514"></a>00514 {
<a name="l00515"></a>00515 <span class="comment">// Same as the always_noconv case above.</span>
<a name="l00516"></a>00516 __buf = <span class="keyword">reinterpret_cast<</span><span class="keywordtype">char</span>*<span class="keyword">></span>(__ibuf);
<a name="l00517"></a>00517 __blen = __ilen;
<a name="l00518"></a>00518 }
<a name="l00519"></a>00519 <span class="keywordflow">else</span>
<a name="l00520"></a>00520 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::_M_convert_to_external "</span>
<a name="l00521"></a>00521 <span class="stringliteral">"conversion error"</span>));
<a name="l00522"></a>00522
<a name="l00523"></a>00523 __elen = _M_file.xsputn(__buf, __blen);
<a name="l00524"></a>00524 __plen = __blen;
<a name="l00525"></a>00525
<a name="l00526"></a>00526 <span class="comment">// Try once more for partial conversions.</span>
<a name="l00527"></a>00527 <span class="keywordflow">if</span> (__r == codecvt_base::partial && __elen == __plen)
<a name="l00528"></a>00528 {
<a name="l00529"></a>00529 <span class="keyword">const</span> char_type* __iresume = __iend;
<a name="l00530"></a>00530 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __rlen = this->pptr() - __iend;
<a name="l00531"></a>00531 __r = _M_codecvt->out(_M_state_cur, __iresume,
<a name="l00532"></a>00532 __iresume + __rlen, __iend, __buf,
<a name="l00533"></a>00533 __buf + __blen, __bend);
<a name="l00534"></a>00534 <span class="keywordflow">if</span> (__r != codecvt_base::error)
<a name="l00535"></a>00535 {
<a name="l00536"></a>00536 __rlen = __bend - __buf;
<a name="l00537"></a>00537 __elen = _M_file.xsputn(__buf, __rlen);
<a name="l00538"></a>00538 __plen = __rlen;
<a name="l00539"></a>00539 }
<a name="l00540"></a>00540 <span class="keywordflow">else</span>
<a name="l00541"></a>00541 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::_M_convert_to_external "</span>
<a name="l00542"></a>00542 <span class="stringliteral">"conversion error"</span>));
<a name="l00543"></a>00543 }
<a name="l00544"></a>00544 }
<a name="l00545"></a>00545 <span class="keywordflow">return</span> __elen == __plen;
<a name="l00546"></a>00546 }
<a name="l00547"></a>00547
<a name="l00548"></a>00548 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00549"></a>00549 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a>
<a name="l00550"></a>00550 <a class="code" href="a00247.html#a4fb6d662a8351a9c790be9fbe78be8b4" title="Multiple character extraction.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00551"></a><a class="code" href="a00247.html#a4fb6d662a8351a9c790be9fbe78be8b4">00551</a> <a class="code" href="a00247.html#a4fb6d662a8351a9c790be9fbe78be8b4" title="Multiple character extraction."> xsgetn</a>(_CharT* __s, <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __n)
<a name="l00552"></a>00552 {
<a name="l00553"></a>00553 <span class="comment">// Clear out pback buffer before going on to the real deal...</span>
<a name="l00554"></a>00554 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ret = 0;
<a name="l00555"></a>00555 <span class="keywordflow">if</span> (_M_pback_init)
<a name="l00556"></a>00556 {
<a name="l00557"></a>00557 <span class="keywordflow">if</span> (__n > 0 && this->gptr() == this->eback())
<a name="l00558"></a>00558 {
<a name="l00559"></a>00559 *__s++ = *this->gptr(); <span class="comment">// emulate non-underflowing sbumpc</span>
<a name="l00560"></a>00560 this->gbump(1);
<a name="l00561"></a>00561 __ret = 1;
<a name="l00562"></a>00562 --__n;
<a name="l00563"></a>00563 }
<a name="l00564"></a>00564 _M_destroy_pback();
<a name="l00565"></a>00565 }
<a name="l00566"></a>00566 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_writing)
<a name="l00567"></a>00567 {
<a name="l00568"></a>00568 <span class="keywordflow">if</span> (overflow() == traits_type::eof())
<a name="l00569"></a>00569 <span class="keywordflow">return</span> __ret;
<a name="l00570"></a>00570 _M_set_buffer(-1);
<a name="l00571"></a>00571 _M_writing = <span class="keyword">false</span>;
<a name="l00572"></a>00572 }
<a name="l00573"></a>00573
<a name="l00574"></a>00574 <span class="comment">// Optimization in the always_noconv() case, to be generalized in the</span>
<a name="l00575"></a>00575 <span class="comment">// future: when __n > __buflen we read directly instead of using the</span>
<a name="l00576"></a>00576 <span class="comment">// buffer repeatedly.</span>
<a name="l00577"></a>00577 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & <a class="code" href="a00528.html#a652e2323949eea3d906e1c81bd8ce8f7" title="Open for input. Default for ifstream and fstream.">ios_base::in</a>;
<a name="l00578"></a>00578 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
<a name="l00579"></a>00579
<a name="l00580"></a>00580 <span class="keywordflow">if</span> (__n > __buflen && __check_facet(_M_codecvt).always_noconv()
<a name="l00581"></a>00581 && __testin)
<a name="l00582"></a>00582 {
<a name="l00583"></a>00583 <span class="comment">// First, copy the chars already present in the buffer.</span>
<a name="l00584"></a>00584 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __avail = this->egptr() - this->gptr();
<a name="l00585"></a>00585 <span class="keywordflow">if</span> (__avail != 0)
<a name="l00586"></a>00586 {
<a name="l00587"></a>00587 traits_type::copy(__s, this->gptr(), __avail);
<a name="l00588"></a>00588 __s += __avail;
<a name="l00589"></a>00589 this->setg(this->eback(), this->gptr() + __avail,
<a name="l00590"></a>00590 this->egptr());
<a name="l00591"></a>00591 __ret += __avail;
<a name="l00592"></a>00592 __n -= __avail;
<a name="l00593"></a>00593 }
<a name="l00594"></a>00594
<a name="l00595"></a>00595 <span class="comment">// Need to loop in case of short reads (relatively common</span>
<a name="l00596"></a>00596 <span class="comment">// with pipes).</span>
<a name="l00597"></a>00597 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __len;
<a name="l00598"></a>00598 <span class="keywordflow">for</span> (;;)
<a name="l00599"></a>00599 {
<a name="l00600"></a>00600 __len = _M_file.xsgetn(reinterpret_cast<char*>(__s),
<a name="l00601"></a>00601 __n);
<a name="l00602"></a>00602 <span class="keywordflow">if</span> (__len == -1)
<a name="l00603"></a>00603 __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::xsgetn "</span>
<a name="l00604"></a>00604 <span class="stringliteral">"error reading the file"</span>));
<a name="l00605"></a>00605 <span class="keywordflow">if</span> (__len == 0)
<a name="l00606"></a>00606 <span class="keywordflow">break</span>;
<a name="l00607"></a>00607
<a name="l00608"></a>00608 __n -= __len;
<a name="l00609"></a>00609 __ret += __len;
<a name="l00610"></a>00610 <span class="keywordflow">if</span> (__n == 0)
<a name="l00611"></a>00611 <span class="keywordflow">break</span>;
<a name="l00612"></a>00612
<a name="l00613"></a>00613 __s += __len;
<a name="l00614"></a>00614 }
<a name="l00615"></a>00615
<a name="l00616"></a>00616 <span class="keywordflow">if</span> (__n == 0)
<a name="l00617"></a>00617 {
<a name="l00618"></a>00618 _M_set_buffer(0);
<a name="l00619"></a>00619 _M_reading = <span class="keyword">true</span>;
<a name="l00620"></a>00620 }
<a name="l00621"></a>00621 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__len == 0)
<a name="l00622"></a>00622 {
<a name="l00623"></a>00623 <span class="comment">// If end of file is reached, set 'uncommitted'</span>
<a name="l00624"></a>00624 <span class="comment">// mode, thus allowing an immediate write without</span>
<a name="l00625"></a>00625 <span class="comment">// an intervening seek.</span>
<a name="l00626"></a>00626 _M_set_buffer(-1);
<a name="l00627"></a>00627 _M_reading = <span class="keyword">false</span>;
<a name="l00628"></a>00628 }
<a name="l00629"></a>00629 }
<a name="l00630"></a>00630 <span class="keywordflow">else</span>
<a name="l00631"></a>00631 __ret += __streambuf_type::xsgetn(__s, __n);
<a name="l00632"></a>00632
<a name="l00633"></a>00633 <span class="keywordflow">return</span> __ret;
<a name="l00634"></a>00634 }
<a name="l00635"></a>00635
<a name="l00636"></a>00636 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00637"></a>00637 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a>
<a name="l00638"></a>00638 <a class="code" href="a00247.html#a9e78a1d5dec2c7eea816ada4e43d7576" title="Multiple character insertion.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00639"></a><a class="code" href="a00247.html#a9e78a1d5dec2c7eea816ada4e43d7576">00639</a> <a class="code" href="a00247.html#a9e78a1d5dec2c7eea816ada4e43d7576" title="Multiple character insertion."> xsputn</a>(<span class="keyword">const</span> _CharT* __s, <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __n)
<a name="l00640"></a>00640 {
<a name="l00641"></a>00641 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ret = 0;
<a name="l00642"></a>00642 <span class="comment">// Optimization in the always_noconv() case, to be generalized in the</span>
<a name="l00643"></a>00643 <span class="comment">// future: when __n is sufficiently large we write directly instead of</span>
<a name="l00644"></a>00644 <span class="comment">// using the buffer.</span>
<a name="l00645"></a>00645 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testout = _M_mode & <a class="code" href="a00528.html#a7187e216e5d16ec820ea1791002f85e0" title="Open for output. Default for ofstream and fstream.">ios_base::out</a>;
<a name="l00646"></a>00646 <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv()
<a name="l00647"></a>00647 && __testout && !_M_reading)
<a name="l00648"></a>00648 {
<a name="l00649"></a>00649 <span class="comment">// Measurement would reveal the best choice.</span>
<a name="l00650"></a>00650 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __chunk = 1ul << 10;
<a name="l00651"></a>00651 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __bufavail = this->epptr() - this->pptr();
<a name="l00652"></a>00652
<a name="l00653"></a>00653 <span class="comment">// Don't mistake 'uncommitted' mode buffered with unbuffered.</span>
<a name="l00654"></a>00654 <span class="keywordflow">if</span> (!_M_writing && _M_buf_size > 1)
<a name="l00655"></a>00655 __bufavail = _M_buf_size - 1;
<a name="l00656"></a>00656
<a name="l00657"></a>00657 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __limit = <a class="code" href="a01184.html#ga49f0c87cb0e1bf950f5c2d49aa106573" title="This does what you think it does.">std::min</a>(__chunk, __bufavail);
<a name="l00658"></a>00658 <span class="keywordflow">if</span> (__n >= __limit)
<a name="l00659"></a>00659 {
<a name="l00660"></a>00660 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __buffill = this->pptr() - this->pbase();
<a name="l00661"></a>00661 <span class="keyword">const</span> <span class="keywordtype">char</span>* __buf = <span class="keyword">reinterpret_cast<</span><span class="keyword">const </span><span class="keywordtype">char</span>*<span class="keyword">></span>(this->pbase());
<a name="l00662"></a>00662 __ret = _M_file.xsputn_2(__buf, __buffill,
<a name="l00663"></a>00663 reinterpret_cast<const char*>(__s),
<a name="l00664"></a>00664 __n);
<a name="l00665"></a>00665 <span class="keywordflow">if</span> (__ret == __buffill + __n)
<a name="l00666"></a>00666 {
<a name="l00667"></a>00667 _M_set_buffer(0);
<a name="l00668"></a>00668 _M_writing = <span class="keyword">true</span>;
<a name="l00669"></a>00669 }
<a name="l00670"></a>00670 <span class="keywordflow">if</span> (__ret > __buffill)
<a name="l00671"></a>00671 __ret -= __buffill;
<a name="l00672"></a>00672 <span class="keywordflow">else</span>
<a name="l00673"></a>00673 __ret = 0;
<a name="l00674"></a>00674 }
<a name="l00675"></a>00675 <span class="keywordflow">else</span>
<a name="l00676"></a>00676 __ret = __streambuf_type::xsputn(__s, __n);
<a name="l00677"></a>00677 }
<a name="l00678"></a>00678 <span class="keywordflow">else</span>
<a name="l00679"></a>00679 __ret = __streambuf_type::xsputn(__s, __n);
<a name="l00680"></a>00680 <span class="keywordflow">return</span> __ret;
<a name="l00681"></a>00681 }
<a name="l00682"></a>00682
<a name="l00683"></a>00683 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00684"></a>00684 <span class="keyword">typename</span> <a class="code" href="a00252.html">basic_filebuf<_CharT, _Traits>::__streambuf_type</a>*
<a name="l00685"></a>00685 <a class="code" href="a00247.html#afdc468aedafb80e43f14569d09485e6b" title="Manipulates the buffer.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00686"></a><a class="code" href="a00247.html#afdc468aedafb80e43f14569d09485e6b">00686</a> <a class="code" href="a00247.html#afdc468aedafb80e43f14569d09485e6b" title="Manipulates the buffer."> setbuf</a>(<a class="code" href="a00247.html#aa966e9fb8cb5ec6c681f671858d84861">char_type</a>* __s, <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __n)
<a name="l00687"></a>00687 {
<a name="l00688"></a>00688 <span class="keywordflow">if</span> (!this->is_open())
<a name="l00689"></a>00689 {
<a name="l00690"></a>00690 <span class="keywordflow">if</span> (__s == 0 && __n == 0)
<a name="l00691"></a>00691 _M_buf_size = 1;
<a name="l00692"></a>00692 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__s && __n > 0)
<a name="l00693"></a>00693 {
<a name="l00694"></a>00694 <span class="comment">// This is implementation-defined behavior, and assumes that</span>
<a name="l00695"></a>00695 <span class="comment">// an external char_type array of length __n exists and has</span>
<a name="l00696"></a>00696 <span class="comment">// been pre-allocated. If this is not the case, things will</span>
<a name="l00697"></a>00697 <span class="comment">// quickly blow up. When __n > 1, __n - 1 positions will be</span>
<a name="l00698"></a>00698 <span class="comment">// used for the get area, __n - 1 for the put area and 1</span>
<a name="l00699"></a>00699 <span class="comment">// position to host the overflow char of a full put area.</span>
<a name="l00700"></a>00700 <span class="comment">// When __n == 1, 1 position will be used for the get area</span>
<a name="l00701"></a>00701 <span class="comment">// and 0 for the put area, as in the unbuffered case above.</span>
<a name="l00702"></a>00702 _M_buf = __s;
<a name="l00703"></a>00703 _M_buf_size = __n;
<a name="l00704"></a>00704 }
<a name="l00705"></a>00705 }
<a name="l00706"></a>00706 <span class="keywordflow">return</span> <span class="keyword">this</span>;
<a name="l00707"></a>00707 }
<a name="l00708"></a>00708
<a name="l00709"></a>00709
<a name="l00710"></a>00710 <span class="comment">// According to 27.8.1.4 p11 - 13, seekoff should ignore the last</span>
<a name="l00711"></a>00711 <span class="comment">// argument (of type openmode).</span>
<a name="l00712"></a>00712 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00713"></a>00713 <span class="keyword">typename</span> <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">basic_filebuf<_CharT, _Traits>::pos_type</a>
<a name="l00714"></a>00714 <a class="code" href="a00247.html#a0152beebcac8c9542b6b0efe3de5bbfb" title="Alters the stream positions.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00715"></a><a class="code" href="a00247.html#a0152beebcac8c9542b6b0efe3de5bbfb">00715</a> <a class="code" href="a00247.html#a0152beebcac8c9542b6b0efe3de5bbfb" title="Alters the stream positions."> seekoff</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a> __off, ios_base::seekdir __way, ios_base::openmode)
<a name="l00716"></a>00716 {
<a name="l00717"></a>00717 <span class="keywordtype">int</span> __width = 0;
<a name="l00718"></a>00718 <span class="keywordflow">if</span> (_M_codecvt)
<a name="l00719"></a>00719 __width = _M_codecvt->encoding();
<a name="l00720"></a>00720 <span class="keywordflow">if</span> (__width < 0)
<a name="l00721"></a>00721 __width = 0;
<a name="l00722"></a>00722
<a name="l00723"></a>00723 <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a> __ret = <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1));
<a name="l00724"></a>00724 <span class="keyword">const</span> <span class="keywordtype">bool</span> __testfail = __off != 0 && __width <= 0;
<a name="l00725"></a>00725 <span class="keywordflow">if</span> (this->is_open() && !__testfail)
<a name="l00726"></a>00726 {
<a name="l00727"></a>00727 <span class="comment">// tellg and tellp queries do not affect any state, unless</span>
<a name="l00728"></a>00728 <span class="comment">// ! always_noconv and the put sequence is not empty.</span>
<a name="l00729"></a>00729 <span class="comment">// In that case, determining the position requires converting the</span>
<a name="l00730"></a>00730 <span class="comment">// put sequence. That doesn't use ext_buf, so requires a flush.</span>
<a name="l00731"></a>00731 <span class="keywordtype">bool</span> __no_movement = __way == <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a> && __off == 0
<a name="l00732"></a>00732 && (!_M_writing || _M_codecvt->always_noconv());
<a name="l00733"></a>00733
<a name="l00734"></a>00734 <span class="comment">// Ditch any pback buffers to avoid confusion.</span>
<a name="l00735"></a>00735 <span class="keywordflow">if</span> (!__no_movement)
<a name="l00736"></a>00736 _M_destroy_pback();
<a name="l00737"></a>00737
<a name="l00738"></a>00738 <span class="comment">// Correct state at destination. Note that this is the correct</span>
<a name="l00739"></a>00739 <span class="comment">// state for the current position during output, because</span>
<a name="l00740"></a>00740 <span class="comment">// codecvt::unshift() returns the state to the initial state.</span>
<a name="l00741"></a>00741 <span class="comment">// This is also the correct state at the end of the file because</span>
<a name="l00742"></a>00742 <span class="comment">// an unshift sequence should have been written at the end.</span>
<a name="l00743"></a>00743 __state_type __state = _M_state_beg;
<a name="l00744"></a>00744 <a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a> __computed_off = __off * __width;
<a name="l00745"></a>00745 <span class="keywordflow">if</span> (_M_reading && __way == <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a>)
<a name="l00746"></a>00746 {
<a name="l00747"></a>00747 __state = _M_state_last;
<a name="l00748"></a>00748 __computed_off += _M_get_ext_pos(__state);
<a name="l00749"></a>00749 }
<a name="l00750"></a>00750 <span class="keywordflow">if</span> (!__no_movement)
<a name="l00751"></a>00751 __ret = _M_seek(__computed_off, __way, __state);
<a name="l00752"></a>00752 <span class="keywordflow">else</span>
<a name="l00753"></a>00753 {
<a name="l00754"></a>00754 <span class="keywordflow">if</span> (_M_writing)
<a name="l00755"></a>00755 __computed_off = this->pptr() - this->pbase();
<a name="l00756"></a>00756
<a name="l00757"></a>00757 <a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a> __file_off = _M_file.seekoff(0, <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a>);
<a name="l00758"></a>00758 <span class="keywordflow">if</span> (__file_off != <a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1))
<a name="l00759"></a>00759 {
<a name="l00760"></a>00760 __ret = __file_off + __computed_off;
<a name="l00761"></a>00761 __ret.state(__state);
<a name="l00762"></a>00762 }
<a name="l00763"></a>00763 }
<a name="l00764"></a>00764 }
<a name="l00765"></a>00765 <span class="keywordflow">return</span> __ret;
<a name="l00766"></a>00766 }
<a name="l00767"></a>00767
<a name="l00768"></a>00768 <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span>
<a name="l00769"></a>00769 <span class="comment">// 171. Strange seekpos() semantics due to joint position</span>
<a name="l00770"></a>00770 <span class="comment">// According to the resolution of DR 171, seekpos should ignore the last</span>
<a name="l00771"></a>00771 <span class="comment">// argument (of type openmode).</span>
<a name="l00772"></a>00772 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00773"></a>00773 <span class="keyword">typename</span> <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">basic_filebuf<_CharT, _Traits>::pos_type</a>
<a name="l00774"></a>00774 <a class="code" href="a00247.html#a91365d684bb298cb7ad42e3c73cd0252" title="Alters the stream positions.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00775"></a><a class="code" href="a00247.html#a91365d684bb298cb7ad42e3c73cd0252">00775</a> <a class="code" href="a00247.html#a91365d684bb298cb7ad42e3c73cd0252" title="Alters the stream positions."> seekpos</a>(<a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a> __pos, ios_base::openmode)
<a name="l00776"></a>00776 {
<a name="l00777"></a>00777 <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a> __ret = <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1));
<a name="l00778"></a>00778 <span class="keywordflow">if</span> (this->is_open())
<a name="l00779"></a>00779 {
<a name="l00780"></a>00780 <span class="comment">// Ditch any pback buffers to avoid confusion.</span>
<a name="l00781"></a>00781 _M_destroy_pback();
<a name="l00782"></a>00782 __ret = _M_seek(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(__pos), <a class="code" href="a00528.html#a214f784b4a9d7ce92eb23ed99e44aecf" title="Request a seek relative to the beginning of the stream.">ios_base::beg</a>, __pos.state());
<a name="l00783"></a>00783 }
<a name="l00784"></a>00784 <span class="keywordflow">return</span> __ret;
<a name="l00785"></a>00785 }
<a name="l00786"></a>00786
<a name="l00787"></a>00787 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00788"></a>00788 <span class="keyword">typename</span> <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">basic_filebuf<_CharT, _Traits>::pos_type</a>
<a name="l00789"></a>00789 <a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00790"></a>00790 <a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque..."> _M_seek</a>(off_type __off, ios_base::seekdir __way, __state_type __state)
<a name="l00791"></a>00791 {
<a name="l00792"></a>00792 pos_type __ret = pos_type(off_type(-1));
<a name="l00793"></a>00793 <span class="keywordflow">if</span> (_M_terminate_output())
<a name="l00794"></a>00794 {
<a name="l00795"></a>00795 off_type __file_off = _M_file.seekoff(__off, __way);
<a name="l00796"></a>00796 <span class="keywordflow">if</span> (__file_off != off_type(-1))
<a name="l00797"></a>00797 {
<a name="l00798"></a>00798 _M_reading = <span class="keyword">false</span>;
<a name="l00799"></a>00799 _M_writing = <span class="keyword">false</span>;
<a name="l00800"></a>00800 _M_ext_next = _M_ext_end = _M_ext_buf;
<a name="l00801"></a>00801 _M_set_buffer(-1);
<a name="l00802"></a>00802 _M_state_cur = __state;
<a name="l00803"></a>00803 __ret = __file_off;
<a name="l00804"></a>00804 __ret.state(_M_state_cur);
<a name="l00805"></a>00805 }
<a name="l00806"></a>00806 }
<a name="l00807"></a>00807 <span class="keywordflow">return</span> __ret;
<a name="l00808"></a>00808 }
<a name="l00809"></a>00809
<a name="l00810"></a>00810 <span class="comment">// Returns the distance from the end of the ext buffer to the point</span>
<a name="l00811"></a>00811 <span class="comment">// corresponding to gptr(). This is a negative value. Updates __state</span>
<a name="l00812"></a>00812 <span class="comment">// from eback() correspondence to gptr().</span>
<a name="l00813"></a>00813 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00814"></a>00814 <span class="keywordtype">int</span> basic_filebuf<_CharT, _Traits>::
<a name="l00815"></a>00815 _M_get_ext_pos(__state_type& __state)
<a name="l00816"></a>00816 {
<a name="l00817"></a>00817 <span class="keywordflow">if</span> (_M_codecvt->always_noconv())
<a name="l00818"></a>00818 <span class="keywordflow">return</span> this->gptr() - this->egptr();
<a name="l00819"></a>00819 <span class="keywordflow">else</span>
<a name="l00820"></a>00820 {
<a name="l00821"></a>00821 <span class="comment">// Calculate offset from _M_ext_buf that corresponds to</span>
<a name="l00822"></a>00822 <span class="comment">// gptr(). Precondition: __state == _M_state_last, which</span>
<a name="l00823"></a>00823 <span class="comment">// corresponds to eback().</span>
<a name="l00824"></a>00824 <span class="keyword">const</span> <span class="keywordtype">int</span> __gptr_off =
<a name="l00825"></a>00825 _M_codecvt->length(__state, _M_ext_buf, _M_ext_next,
<a name="l00826"></a>00826 this->gptr() - this->eback());
<a name="l00827"></a>00827 <span class="keywordflow">return</span> _M_ext_buf + __gptr_off - _M_ext_end;
<a name="l00828"></a>00828 }
<a name="l00829"></a>00829 }
<a name="l00830"></a>00830
<a name="l00831"></a>00831 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00832"></a>00832 <span class="keywordtype">bool</span>
<a name="l00833"></a>00833 basic_filebuf<_CharT, _Traits>::
<a name="l00834"></a>00834 _M_terminate_output()
<a name="l00835"></a>00835 {
<a name="l00836"></a>00836 <span class="comment">// Part one: update the output sequence.</span>
<a name="l00837"></a>00837 <span class="keywordtype">bool</span> __testvalid = <span class="keyword">true</span>;
<a name="l00838"></a>00838 <span class="keywordflow">if</span> (this->pbase() < this->pptr())
<a name="l00839"></a>00839 {
<a name="l00840"></a>00840 <span class="keyword">const</span> int_type __tmp = this->overflow();
<a name="l00841"></a>00841 <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))
<a name="l00842"></a>00842 __testvalid = <span class="keyword">false</span>;
<a name="l00843"></a>00843 }
<a name="l00844"></a>00844
<a name="l00845"></a>00845 <span class="comment">// Part two: output unshift sequence.</span>
<a name="l00846"></a>00846 <span class="keywordflow">if</span> (_M_writing && !__check_facet(_M_codecvt).always_noconv()
<a name="l00847"></a>00847 && __testvalid)
<a name="l00848"></a>00848 {
<a name="l00849"></a>00849 <span class="comment">// Note: this value is arbitrary, since there is no way to</span>
<a name="l00850"></a>00850 <span class="comment">// get the length of the unshift sequence from codecvt,</span>
<a name="l00851"></a>00851 <span class="comment">// without calling unshift.</span>
<a name="l00852"></a>00852 <span class="keyword">const</span> <span class="keywordtype">size_t</span> __blen = 128;
<a name="l00853"></a>00853 <span class="keywordtype">char</span> __buf[__blen];
<a name="l00854"></a>00854 codecvt_base::result __r;
<a name="l00855"></a>00855 <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __ilen = 0;
<a name="l00856"></a>00856
<a name="l00857"></a>00857 <span class="keywordflow">do</span>
<a name="l00858"></a>00858 {
<a name="l00859"></a>00859 <span class="keywordtype">char</span>* __next;
<a name="l00860"></a>00860 __r = _M_codecvt->unshift(_M_state_cur, __buf,
<a name="l00861"></a>00861 __buf + __blen, __next);
<a name="l00862"></a>00862 <span class="keywordflow">if</span> (__r == codecvt_base::error)
<a name="l00863"></a>00863 __testvalid = <span class="keyword">false</span>;
<a name="l00864"></a>00864 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::ok ||
<a name="l00865"></a>00865 __r == codecvt_base::partial)
<a name="l00866"></a>00866 {
<a name="l00867"></a>00867 __ilen = __next - __buf;
<a name="l00868"></a>00868 <span class="keywordflow">if</span> (__ilen > 0)
<a name="l00869"></a>00869 {
<a name="l00870"></a>00870 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __elen = _M_file.xsputn(__buf, __ilen);
<a name="l00871"></a>00871 <span class="keywordflow">if</span> (__elen != __ilen)
<a name="l00872"></a>00872 __testvalid = <span class="keyword">false</span>;
<a name="l00873"></a>00873 }
<a name="l00874"></a>00874 }
<a name="l00875"></a>00875 }
<a name="l00876"></a>00876 <span class="keywordflow">while</span> (__r == codecvt_base::partial && __ilen > 0 && __testvalid);
<a name="l00877"></a>00877
<a name="l00878"></a>00878 <span class="keywordflow">if</span> (__testvalid)
<a name="l00879"></a>00879 {
<a name="l00880"></a>00880 <span class="comment">// This second call to overflow() is required by the standard,</span>
<a name="l00881"></a>00881 <span class="comment">// but it's not clear why it's needed, since the output buffer</span>
<a name="l00882"></a>00882 <span class="comment">// should be empty by this point (it should have been emptied</span>
<a name="l00883"></a>00883 <span class="comment">// in the first call to overflow()).</span>
<a name="l00884"></a>00884 <span class="keyword">const</span> int_type __tmp = this->overflow();
<a name="l00885"></a>00885 <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))
<a name="l00886"></a>00886 __testvalid = <span class="keyword">false</span>;
<a name="l00887"></a>00887 }
<a name="l00888"></a>00888 }
<a name="l00889"></a>00889 <span class="keywordflow">return</span> __testvalid;
<a name="l00890"></a>00890 }
<a name="l00891"></a>00891
<a name="l00892"></a>00892 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00893"></a>00893 <span class="keywordtype">int</span>
<a name="l00894"></a>00894 <a class="code" href="a00247.html#af42cd30ec66c6eb0df56026098b6e04f" title="Synchronizes the buffer arrays with the controlled sequences.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00895"></a><a class="code" href="a00247.html#af42cd30ec66c6eb0df56026098b6e04f">00895</a> <a class="code" href="a00247.html#af42cd30ec66c6eb0df56026098b6e04f" title="Synchronizes the buffer arrays with the controlled sequences."> sync</a>()
<a name="l00896"></a>00896 {
<a name="l00897"></a>00897 <span class="comment">// Make sure that the internal buffer resyncs its idea of</span>
<a name="l00898"></a>00898 <span class="comment">// the file position with the external file.</span>
<a name="l00899"></a>00899 <span class="keywordtype">int</span> __ret = 0;
<a name="l00900"></a>00900 <span class="keywordflow">if</span> (this->pbase() < this->pptr())
<a name="l00901"></a>00901 {
<a name="l00902"></a>00902 <span class="keyword">const</span> <a class="code" href="a00247.html#a468d92e853b45e38905a014fc14b8b33">int_type</a> __tmp = this->overflow();
<a name="l00903"></a>00903 <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))
<a name="l00904"></a>00904 __ret = -1;
<a name="l00905"></a>00905 }
<a name="l00906"></a>00906 <span class="keywordflow">return</span> __ret;
<a name="l00907"></a>00907 }
<a name="l00908"></a>00908
<a name="l00909"></a>00909 <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits>
<a name="l00910"></a>00910 <span class="keywordtype">void</span>
<a name="l00911"></a>00911 <a class="code" href="a00247.html#a4e8214d23c9895a180231de6cf463449" title="Changes translations.">basic_filebuf<_CharT, _Traits>::</a>
<a name="l00912"></a><a class="code" href="a00247.html#a4e8214d23c9895a180231de6cf463449">00912</a> <a class="code" href="a00247.html#a4e8214d23c9895a180231de6cf463449" title="Changes translations."> imbue</a>(<span class="keyword">const</span> <a class="code" href="a00581.html" title="Container class for localization functionality.The locale class is first a class wrapper for C librar...">locale</a>& __loc)
<a name="l00913"></a>00913 {
<a name="l00914"></a>00914 <span class="keywordtype">bool</span> __testvalid = <span class="keyword">true</span>;
<a name="l00915"></a>00915
<a name="l00916"></a>00916 <span class="keyword">const</span> <a class="code" href="a00426.html" title="Primary class template codecvt.NB: Generic, mostly useless implementation.">__codecvt_type</a>* _M_codecvt_tmp = 0;
<a name="l00917"></a>00917 <span class="keywordflow">if</span> (__builtin_expect(has_facet<__codecvt_type>(__loc), <span class="keyword">true</span>))
<a name="l00918"></a>00918 _M_codecvt_tmp = &use_facet<__codecvt_type>(__loc);
<a name="l00919"></a>00919
<a name="l00920"></a>00920 <span class="keywordflow">if</span> (this->is_open())
<a name="l00921"></a>00921 {
<a name="l00922"></a>00922 <span class="comment">// encoding() == -1 is ok only at the beginning.</span>
<a name="l00923"></a>00923 <span class="keywordflow">if</span> ((_M_reading || _M_writing)
<a name="l00924"></a>00924 && __check_facet(_M_codecvt).encoding() == -1)
<a name="l00925"></a>00925 __testvalid = <span class="keyword">false</span>;
<a name="l00926"></a>00926 <span class="keywordflow">else</span>
<a name="l00927"></a>00927 {
<a name="l00928"></a>00928 <span class="keywordflow">if</span> (_M_reading)
<a name="l00929"></a>00929 {
<a name="l00930"></a>00930 <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())
<a name="l00931"></a>00931 {
<a name="l00932"></a>00932 <span class="keywordflow">if</span> (_M_codecvt_tmp
<a name="l00933"></a>00933 && !__check_facet(_M_codecvt_tmp).always_noconv())
<a name="l00934"></a>00934 __testvalid = this->seekoff(0, <a class="code" href="a00528.html#a1965600e26ca83d186504a4fd337cb9e" title="Request a seek relative to the current position within the sequence.">ios_base::cur</a>, _M_mode)
<a name="l00935"></a>00935 != <a class="code" href="a00247.html#ad3214736a288be0799d5dc49b5e2f597">pos_type</a>(<a class="code" href="a00247.html#afc4d417fe3b280f53f74911ad3f2d383">off_type</a>(-1));
<a name="l00936"></a>00936 }
<a name="l00937"></a>00937 <span class="keywordflow">else</span>
<a name="l00938"></a>00938 {
<a name="l00939"></a>00939 <span class="comment">// External position corresponding to gptr().</span>
<a name="l00940"></a>00940 _M_ext_next = _M_ext_buf
<a name="l00941"></a>00941 + _M_codecvt->length(_M_state_last, _M_ext_buf,
<a name="l00942"></a>00942 _M_ext_next,
<a name="l00943"></a>00943 this->gptr() - this->eback());
<a name="l00944"></a>00944 <span class="keyword">const</span> <a class="code" href="a01137.html#a05eef5582eb5de62b76db4916f7adb84" title="Integral type for I/O operation counts and buffer sizes.">streamsize</a> __remainder = _M_ext_end - _M_ext_next;
<a name="l00945"></a>00945 <span class="keywordflow">if</span> (__remainder)
<a name="l00946"></a>00946 __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
<a name="l00947"></a>00947
<a name="l00948"></a>00948 _M_ext_next = _M_ext_buf;
<a name="l00949"></a>00949 _M_ext_end = _M_ext_buf + __remainder;
<a name="l00950"></a>00950 _M_set_buffer(-1);
<a name="l00951"></a>00951 _M_state_last = _M_state_cur = _M_state_beg;
<a name="l00952"></a>00952 }
<a name="l00953"></a>00953 }
<a name="l00954"></a>00954 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_writing && (__testvalid = _M_terminate_output()))
<a name="l00955"></a>00955 _M_set_buffer(-1);
<a name="l00956"></a>00956 }
<a name="l00957"></a>00957 }
<a name="l00958"></a>00958
<a name="l00959"></a>00959 <span class="keywordflow">if</span> (__testvalid)
<a name="l00960"></a>00960 _M_codecvt = _M_codecvt_tmp;
<a name="l00961"></a>00961 <span class="keywordflow">else</span>
<a name="l00962"></a>00962 _M_codecvt = 0;
<a name="l00963"></a>00963 }
<a name="l00964"></a>00964
<a name="l00965"></a>00965 <span class="comment">// Inhibit implicit instantiations for required instantiations,</span>
<a name="l00966"></a>00966 <span class="comment">// which are defined via explicit instantiations elsewhere.</span>
<a name="l00967"></a>00967 <span class="preprocessor">#if _GLIBCXX_EXTERN_TEMPLATE</span>
<a name="l00968"></a>00968 <span class="preprocessor"></span> <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf<char></a>;
<a name="l00969"></a>00969 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00396.html" title="Controlling input for files.This class supports reading from named files, using the inherited functio...">basic_ifstream<char></a>;
<a name="l00970"></a>00970 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00399.html" title="Controlling output for files.This class supports reading from named files, using the inherited functi...">basic_ofstream<char></a>;
<a name="l00971"></a>00971 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00395.html" title="Controlling input and output for files.This class supports reading from and writing to named files...">basic_fstream<char></a>;
<a name="l00972"></a>00972
<a name="l00973"></a>00973 <span class="preprocessor">#ifdef _GLIBCXX_USE_WCHAR_T</span>
<a name="l00974"></a>00974 <span class="preprocessor"></span> <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00247.html" title="The actual work of input and output (for files).This class associates both its input and output seque...">basic_filebuf<wchar_t></a>;
<a name="l00975"></a>00975 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00396.html" title="Controlling input for files.This class supports reading from named files, using the inherited functio...">basic_ifstream<wchar_t></a>;
<a name="l00976"></a>00976 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00399.html" title="Controlling output for files.This class supports reading from named files, using the inherited functi...">basic_ofstream<wchar_t></a>;
<a name="l00977"></a>00977 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="a00395.html" title="Controlling input and output for files.This class supports reading from and writing to named files...">basic_fstream<wchar_t></a>;
<a name="l00978"></a>00978 <span class="preprocessor">#endif</span>
<a name="l00979"></a>00979 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00980"></a>00980 <span class="preprocessor"></span>
<a name="l00981"></a>00981 _GLIBCXX_END_NAMESPACE_VERSION
<a name="l00982"></a>00982 } <span class="comment">// namespace std</span>
<a name="l00983"></a>00983
<a name="l00984"></a>00984 <span class="preprocessor">#endif</span>
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