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<a href="a00353.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// File based streams -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 1997-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file bits/fstream.tcc</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Do not attempt to use it directly. @headername{fstream}</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">//</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// ISO C++ 14882: 27.8 File-based streams</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">//</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#ifndef _FSTREAM_TCC</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#define _FSTREAM_TCC 1</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#pragma GCC system_header</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <<a class="code" href="a00314.html">bits/cxxabi_forced.h</a>></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <<a class="code" href="a00422.html">bits/move.h</a>></span> <span class="comment">// for swap</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">namespace </span><a class="code" href="a01541.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  _M_allocate_internal_buffer()</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Allocate internal buffer only if one doesn't already exist</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// (either allocated or provided by the user via setbuf).</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (!_M_buf_allocated && !_M_buf)</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  _M_buf = <span class="keyword">new</span> char_type[_M_buf_size];</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  _M_buf_allocated = <span class="keyword">true</span>;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  _M_destroy_internal_buffer() throw()</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (_M_buf_allocated)</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">delete</span> [] _M_buf;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  _M_buf = 0;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  _M_buf_allocated = <span class="keyword">false</span>;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">delete</span> [] _M_ext_buf;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  _M_ext_buf = 0;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  _M_ext_buf_size = 0;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  _M_ext_next = 0;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  _M_ext_end = 0;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="code" href="a02063.html#add2d16a8965c490cd9b4cc95b958e09f">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="a02063.html#add2d16a8965c490cd9b4cc95b958e09f"> 80</a></span> <a class="code" href="a02063.html#add2d16a8965c490cd9b4cc95b958e09f"> basic_filebuf</a>() : <a class="code" href="a02455.html">__streambuf_type</a>(), _M_lock(), _M_file(&_M_lock),</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  _M_mode(<a class="code" href="a05799.html">ios_base</a>::openmode(0)), _M_state_beg(), _M_state_cur(),</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  _M_state_last(), _M_buf(0), _M_buf_size(BUFSIZ),</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_pback(), </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false),</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0),</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  _M_ext_end(0)</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (has_facet<__codecvt_type>(this->_M_buf_locale))</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  _M_codecvt = &use_facet<__codecvt_type>(this->_M_buf_locale);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <a class="code" href="a02063.html"> basic_filebuf</a>(<a class="code" href="a02063.html">basic_filebuf</a>&& __rhs)</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  : __streambuf_type(__rhs),</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  _M_lock(), _M_file(<a class="code" href="a01541.html">std</a>::move(__rhs._M_file), &_M_lock),</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  _M_mode(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_mode, <a class="code" href="a05799.html">ios_base</a>::openmode(0))),</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  _M_state_beg(<a class="code" href="a01541.html">std</a>::move(__rhs._M_state_beg)),</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  _M_state_cur(<a class="code" href="a01541.html">std</a>::move(__rhs._M_state_cur)),</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  _M_state_last(<a class="code" href="a01541.html">std</a>::move(__rhs._M_state_last)),</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  _M_buf(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_buf, nullptr)),</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  _M_buf_size(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_buf_size, 1)),</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  _M_buf_allocated(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_buf_allocated, false)),</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  _M_reading(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_reading, false)),</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  _M_writing(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_writing, false)),</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  _M_pback(__rhs._M_pback),</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  _M_pback_cur_save(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_pback_cur_save, nullptr)),</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  _M_pback_end_save(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_pback_end_save, nullptr)),</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  _M_pback_init(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_pback_init, false)),</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  _M_codecvt(__rhs._M_codecvt),</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  _M_ext_buf(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_ext_buf, nullptr)),</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  _M_ext_buf_size(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_ext_buf_size, 0)),</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  _M_ext_next(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_ext_next, nullptr)),</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  _M_ext_end(<a class="code" href="a01541.html">std</a>::__exchange(__rhs._M_ext_end, nullptr))</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  __rhs._M_set_buffer(-1);</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  __rhs._M_state_last = __rhs._M_state_cur = __rhs._M_state_beg;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  basic_filebuf<_CharT, _Traits>&</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  operator=(basic_filebuf&& __rhs)</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  {</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  this->close();</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  __streambuf_type::operator=(__rhs);</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  _M_file.swap(__rhs._M_file);</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  _M_mode = std::__exchange(__rhs._M_mode, ios_base::openmode(0));</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  _M_state_beg = std::move(__rhs._M_state_beg);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  _M_state_cur = std::move(__rhs._M_state_cur);</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  _M_state_last = std::move(__rhs._M_state_last);</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  _M_buf = std::__exchange(__rhs._M_buf, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  _M_buf_size = std::__exchange(__rhs._M_buf_size, 1);</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  _M_buf_allocated = std::__exchange(__rhs._M_buf_allocated, <span class="keyword">false</span>);</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  _M_ext_buf = std::__exchange(__rhs._M_ext_buf, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  _M_ext_buf_size = std::__exchange(__rhs._M_ext_buf_size, 0);</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  _M_ext_next = std::__exchange(__rhs._M_ext_next, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  _M_ext_end = std::__exchange(__rhs._M_ext_end, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  _M_reading = std::__exchange(__rhs._M_reading, <span class="keyword">false</span>);</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  _M_writing = std::__exchange(__rhs._M_writing, <span class="keyword">false</span>);</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  _M_pback_cur_save = std::__exchange(__rhs._M_pback_cur_save, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  _M_pback_end_save = std::__exchange(__rhs._M_pback_end_save, <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  _M_pback_init = std::__exchange(__rhs._M_pback_init, <span class="keyword">false</span>);</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  __rhs._M_set_buffer(-1);</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  __rhs._M_state_last = __rhs._M_state_cur = __rhs._M_state_beg;</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  swap(basic_filebuf& __rhs)</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  {</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  __streambuf_type::swap(__rhs);</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  _M_file.swap(__rhs._M_file);</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  std::swap(_M_mode, __rhs._M_mode);</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  std::swap(_M_state_beg, __rhs._M_state_beg);</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  std::swap(_M_state_cur, __rhs._M_state_cur);</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  std::swap(_M_state_last, __rhs._M_state_last);</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  std::swap(_M_buf, __rhs._M_buf);</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  std::swap(_M_buf_size, __rhs._M_buf_size);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  std::swap(_M_buf_allocated, __rhs._M_buf_allocated);</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  std::swap(_M_ext_buf, __rhs._M_ext_buf);</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  std::swap(_M_ext_buf_size, __rhs._M_ext_buf_size);</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  std::swap(_M_ext_next, __rhs._M_ext_next);</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  std::swap(_M_ext_end, __rhs._M_ext_end);</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  std::swap(_M_reading, __rhs._M_reading);</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  std::swap(_M_writing, __rhs._M_writing);</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  std::swap(_M_pback_cur_save, __rhs._M_pback_cur_save);</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  std::swap(_M_pback_end_save, __rhs._M_pback_end_save);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  std::swap(_M_pback_init, __rhs._M_pback_init);</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::__filebuf_type*</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="a02063.html#ad72dc61561f4420b36f9e626b4426433"> 179</a></span>  open(<span class="keyword">const</span> <span class="keywordtype">char</span>* __s, ios_base::openmode __mode)</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <a class="code" href="a02063.html">__filebuf_type</a> *__ret = 0;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> (!this->is_open())</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  {</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  _M_file.<a class="code" href="a02063.html#ad72dc61561f4420b36f9e626b4426433">open</a>(__s, __mode);</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">if</span> (this->is_open())</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  {</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  _M_allocate_internal_buffer();</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  _M_mode = __mode;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="comment">// Setup initial buffer to 'uncommitted' mode.</span></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  _M_reading = <span class="keyword">false</span>;</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  _M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="comment">// Reset to initial state.</span></div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  _M_state_last = _M_state_cur = _M_state_beg;</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="comment">// 27.8.1.3,4</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> ((__mode & ios_base::ate)</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  && this->seekoff(0, <a class="code" href="a01541.html#a579ff3807b61f57bda29d023b3918504">ios_base::end</a>, __mode)</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  == <a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a>(<a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>(-1)))</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  this->close();</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  __ret = <span class="keyword">this</span>;</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  }</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keyword">typename</span> <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::__filebuf_type</a>*</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00213"></a><span class="lineno"><a class="line" href="a02063.html#a5e13a128abb0a5dd8ef1e3d10597031f"> 213</a></span> <a class="code" href="a02063.html"> close</a>()</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">if</span> (!this->is_open())</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordtype">bool</span> __testfail = <span class="keyword">false</span>;</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  {</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">// NB: Do this here so that re-opened filebufs will be cool...</span></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keyword">struct </span>__close_sentry</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  {</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <a class="code" href="a02063.html">basic_filebuf</a> *__fb;</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  __close_sentry (<a class="code" href="a02063.html">basic_filebuf</a> *__fbi): __fb(__fbi) { }</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  ~__close_sentry ()</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  {</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  __fb-><a class="code" href="a02063.html#a14cdd23152cee458aaa655cf9508f9a6">_M_mode</a> = ios_base::openmode(0);</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  __fb-><a class="code" href="a02063.html#aa144642d688ad4c36807ce149e632995">_M_pback_init</a> = <span class="keyword">false</span>;</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  __fb->_M_destroy_internal_buffer();</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  __fb-><a class="code" href="a02063.html#acde765e7a5ddaca79683176fe981cec1">_M_reading</a> = <span class="keyword">false</span>;</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  __fb->_M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  __fb-><a class="code" href="a02063.html#af3d033b08f1641d4594fb5d21eb2db89">_M_set_buffer</a>(-1);</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  __fb->_M_state_last = __fb->_M_state_cur = __fb->_M_state_beg;</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  }</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  } __cs (<span class="keyword">this</span>);</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  __try</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  {</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">if</span> (!_M_terminate_output())</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  __testfail = <span class="keyword">true</span>;</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  }</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  __catch(<a class="code" href="a05335.html">__cxxabiv1::__forced_unwind</a>&)</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  {</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  _M_file.close();</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  __throw_exception_again;</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  }</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  __catch(...)</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  { __testfail = <span class="keyword">true</span>; }</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">if</span> (!_M_file.close())</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  __testfail = <span class="keyword">true</span>;</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">if</span> (__testfail)</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">return</span> <span class="keyword">this</span>;</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a></div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00263"></a><span class="lineno"><a class="line" href="a02063.html#a0e8e4218ba9766e34b74e69b17fb28b3"> 263</a></span> <a class="code" href="a02063.html"> showmanyc</a>()</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  {</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ret = -1;</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & ios_base::in;</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (__testin && this->is_open())</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  {</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">// For a stateful encoding (-1) the pending sequence might be just</span></div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="comment">// shift and unshift prefixes with no actual character.</span></div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  __ret = this->egptr() - this->gptr();</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="preprocessor">#if _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM</span></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="comment">// About this workaround, see libstdc++/20806.</span></div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testbinary = _M_mode & ios_base::binary;</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).encoding() >= 0</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  && __testbinary)</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).encoding() >= 0)</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  __ret += _M_file.showmanyc() / _M_codecvt->max_length();</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  }</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  }</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::int_type</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00289"></a><span class="lineno"><a class="line" href="a02063.html#a051ec9d0aa68d3bbf3a2b8cb2e41c93b"> 289</a></span> <a class="code" href="a02063.html"> underflow</a>()</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  {</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <a class="code" href="a02455.html#a1c1565d5b66e703de4d9a8aef4957a8b">int_type</a> __ret = traits_type::eof();</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & ios_base::in;</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">if</span> (__testin)</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  {</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">if</span> (_M_writing)</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  {</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">if</span> (overflow() == traits_type::eof())</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  _M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  }</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="comment">// Check for pback madness, and if so switch back to the</span></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="comment">// normal buffers and jet outta here before expensive</span></div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="comment">// fileops happen...</span></div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  _M_destroy_pback();</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">if</span> (this->gptr() < this->egptr())</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordflow">return</span> traits_type::to_int_type(*this->gptr());</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="comment">// Get and convert input sequence.</span></div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="comment">// Will be set to true if ::read() returns 0 indicating EOF.</span></div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordtype">bool</span> __got_eof = <span class="keyword">false</span>;</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="comment">// Number of internal characters produced.</span></div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ilen = 0;</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  codecvt_base::result __r = codecvt_base::ok;</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  {</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()),</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  __buflen);</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="keywordflow">if</span> (__ilen == 0)</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  __got_eof = <span class="keyword">true</span>;</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  }</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  {</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="comment">// Worst-case number of external bytes.</span></div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="comment">// XXX Not done encoding() == -1.</span></div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> __enc = _M_codecvt->encoding();</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __blen; <span class="comment">// Minimum buffer size.</span></div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __rlen; <span class="comment">// Number of chars to read.</span></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keywordflow">if</span> (__enc > 0)</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  __blen = __rlen = __buflen * __enc;</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  {</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  __blen = __buflen + _M_codecvt->max_length() - 1;</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  __rlen = __buflen;</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  }</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __remainder = _M_ext_end - _M_ext_next;</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  __rlen = __rlen > __remainder ? __rlen - __remainder : 0;</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span> </div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="comment">// An imbue in 'read' mode implies first converting the external</span></div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="comment">// chars already present.</span></div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keywordflow">if</span> (_M_reading && this->egptr() == this->eback() && __remainder)</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  __rlen = 0;</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span> </div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <span class="comment">// Allocate buffer if necessary and move unconverted</span></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="comment">// bytes to front.</span></div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  <span class="keywordflow">if</span> (_M_ext_buf_size < __blen)</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  {</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordtype">char</span>* __buf = <span class="keyword">new</span> <span class="keywordtype">char</span>[__blen];</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordflow">if</span> (__remainder)</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  __builtin_memcpy(__buf, _M_ext_next, __remainder);</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span> </div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keyword">delete</span> [] _M_ext_buf;</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  _M_ext_buf = __buf;</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  _M_ext_buf_size = __blen;</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  }</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__remainder)</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  _M_ext_next = _M_ext_buf;</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  _M_ext_end = _M_ext_buf + __remainder;</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  _M_state_last = _M_state_cur;</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span> </div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  {</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">if</span> (__rlen > 0)</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  {</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="comment">// Sanity check!</span></div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="comment">// This may fail if the return value of</span></div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <span class="comment">// codecvt::max_length() is bogus.</span></div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="keywordflow">if</span> (_M_ext_end - _M_ext_buf + __rlen > _M_ext_buf_size)</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  {</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span></div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="stringliteral">"codecvt::max_length() "</span></div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="stringliteral">"is not valid"</span>));</div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  }</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __elen = _M_file.xsgetn(_M_ext_end, __rlen);</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keywordflow">if</span> (__elen == 0)</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  __got_eof = <span class="keyword">true</span>;</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__elen == -1)</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  _M_ext_end += __elen;</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  }</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span> </div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <a class="code" href="a02455.html#a38ad1721a50a96c7d37d51a3f858a0cf">char_type</a>* __iend = this->eback();</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  <span class="keywordflow">if</span> (_M_ext_next < _M_ext_end)</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  __r = _M_codecvt->in(_M_state_cur, _M_ext_next,</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  _M_ext_end, _M_ext_next,</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  this->eback(),</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  this->eback() + __buflen, __iend);</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordflow">if</span> (__r == codecvt_base::noconv)</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  {</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="keywordtype">size_t</span> __avail = _M_ext_end - _M_ext_buf;</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  __ilen = <a class="code" href="a01485.html#gad48656de2f272a953455e1fff2532125">std::min</a>(__avail, __buflen);</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  traits_type::copy(this->eback(),</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  reinterpret_cast<char_type*></div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  (_M_ext_buf), __ilen);</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  _M_ext_next = _M_ext_buf + __ilen;</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  }</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  __ilen = __iend - this->eback();</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span> </div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="comment">// _M_codecvt->in may return error while __ilen > 0: this is</span></div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="comment">// ok, and actually occurs in case of mixed encodings (e.g.,</span></div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="comment">// XML files).</span></div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  <span class="keywordflow">if</span> (__r == codecvt_base::error)</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span> </div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  __rlen = 1;</div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  }</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  <span class="keywordflow">while</span> (__ilen == 0 && !__got_eof);</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  }</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span> </div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="keywordflow">if</span> (__ilen > 0)</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  {</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  _M_set_buffer(__ilen);</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  _M_reading = <span class="keyword">true</span>;</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  __ret = traits_type::to_int_type(*this->gptr());</div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  }</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__got_eof)</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  {</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <span class="comment">// If the actual end of file is reached, set 'uncommitted'</span></div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  <span class="comment">// mode, thus allowing an immediate write without an</span></div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="comment">// intervening seek.</span></div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  _M_reading = <span class="keyword">false</span>;</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  <span class="comment">// However, reaching it while looping on partial means that</span></div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="comment">// the file has got an incomplete character.</span></div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  <span class="keywordflow">if</span> (__r == codecvt_base::partial)</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span></div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="stringliteral">"incomplete character in file"</span>));</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  }</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::error)</div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span></div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="stringliteral">"invalid byte sequence in file"</span>));</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::underflow "</span></div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  <span class="stringliteral">"error reading the file"</span>));</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  }</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  }</div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span> </div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::int_type</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <a class="code" href="a02063.html"> pbackfail</a>(int_type __i)</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  {</div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  int_type __ret = traits_type::eof();</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & ios_base::in;</div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  <span class="keywordflow">if</span> (__testin)</div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  {</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <span class="keywordflow">if</span> (_M_writing)</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  {</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="keywordflow">if</span> (overflow() == traits_type::eof())</div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  _M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  }</div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="comment">// Remember whether the pback buffer is active, otherwise below</span></div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  <span class="comment">// we may try to store in it a second char (libstdc++/9761).</span></div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testpb = _M_pback_init;</div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testeof = traits_type::eq_int_type(__i, __ret);</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  int_type __tmp;</div><div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  <span class="keywordflow">if</span> (this->eback() < this->gptr())</div><div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  {</div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  this->gbump(-1);</div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  __tmp = traits_type::to_int_type(*this->gptr());</div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  }</div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (this->seekoff(-1, ios_base::cur) != pos_type(off_type(-1)))</div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  {</div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  __tmp = this->underflow();</div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, __ret))</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  }</div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  {</div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  <span class="comment">// At the beginning of the buffer, need to make a</span></div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  <span class="comment">// putback position available. But the seek may fail</span></div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <span class="comment">// (f.i., at the beginning of a file, see</span></div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  <span class="comment">// libstdc++/9439) and in that case we return</span></div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  <span class="comment">// traits_type::eof().</span></div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  }</div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span> </div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="comment">// Try to put back __i into input sequence in one of three ways.</span></div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="comment">// Order these tests done in is unspecified by the standard.</span></div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <span class="keywordflow">if</span> (!__testeof && traits_type::eq_int_type(__i, __tmp))</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  __ret = __i;</div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__testeof)</div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  __ret = traits_type::not_eof(__i);</div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!__testpb)</div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  {</div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  _M_create_pback();</div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  _M_reading = <span class="keyword">true</span>;</div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  *this->gptr() = traits_type::to_char_type(__i);</div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  __ret = __i;</div><div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  }</div><div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  }</div><div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  }</div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span> </div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::int_type</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  overflow(int_type __c)</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  {</div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  int_type __ret = traits_type::eof();</div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testeof = traits_type::eq_int_type(__c, __ret);</div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testout = (_M_mode & ios_base::out</div><div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  || _M_mode & ios_base::app);</div><div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  <span class="keywordflow">if</span> (__testout)</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  {</div><div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="keywordflow">if</span> (_M_reading)</div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  {</div><div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  _M_destroy_pback();</div><div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> __gptr_off = _M_get_ext_pos(_M_state_last);</div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  <span class="keywordflow">if</span> (_M_seek(__gptr_off, ios_base::cur, _M_state_last)</div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  == pos_type(off_type(-1)))</div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  }</div><div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="keywordflow">if</span> (this->pbase() < this->pptr())</div><div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  {</div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="comment">// If appropriate, append the overflow char.</span></div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="keywordflow">if</span> (!__testeof)</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  {</div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  *this->pptr() = traits_type::to_char_type(__c);</div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  this->pbump(1);</div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  }</div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span> </div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  <span class="comment">// Convert pending sequence to external representation,</span></div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  <span class="comment">// and output.</span></div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  <span class="keywordflow">if</span> (_M_convert_to_external(this->pbase(),</div><div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  this->pptr() - this->pbase()))</div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  {</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  _M_set_buffer(0);</div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  __ret = traits_type::not_eof(__c);</div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  }</div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  }</div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_buf_size > 1)</div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  {</div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  <span class="comment">// Overflow in 'uncommitted' mode: set _M_writing, set</span></div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="comment">// the buffer to the initial 'write' mode, and put __c</span></div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <span class="comment">// into the buffer.</span></div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  _M_set_buffer(0);</div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  _M_writing = <span class="keyword">true</span>;</div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  <span class="keywordflow">if</span> (!__testeof)</div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  {</div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  *this->pptr() = traits_type::to_char_type(__c);</div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  this->pbump(1);</div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  }</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  __ret = traits_type::not_eof(__c);</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  }</div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  {</div><div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  <span class="comment">// Unbuffered.</span></div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  char_type __conv = traits_type::to_char_type(__c);</div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  <span class="keywordflow">if</span> (__testeof || _M_convert_to_external(&__conv, 1))</div><div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  {</div><div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  _M_writing = <span class="keyword">true</span>;</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  __ret = traits_type::not_eof(__c);</div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  }</div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  }</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  }</div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  }</div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span> </div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  _M_convert_to_external(_CharT* __ibuf, <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ilen)</div><div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  {</div><div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  <span class="comment">// Sizes of external and pending output.</span></div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __elen;</div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __plen;</div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())</div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  {</div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  __elen = _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);</div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  __plen = __ilen;</div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  }</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  {</div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="comment">// Worst-case number of external bytes needed.</span></div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="comment">// XXX Not done encoding() == -1.</span></div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __blen = __ilen * _M_codecvt->max_length();</div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <span class="keywordtype">char</span>* __buf = static_cast<char*>(__builtin_alloca(__blen));</div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span> </div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keywordtype">char</span>* __bend;</div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  <span class="keyword">const</span> char_type* __iend;</div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  codecvt_base::result __r;</div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  __r = _M_codecvt->out(_M_state_cur, __ibuf, __ibuf + __ilen,</div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  __iend, __buf, __buf + __blen, __bend);</div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span> </div><div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  <span class="keywordflow">if</span> (__r == codecvt_base::ok || __r == codecvt_base::partial)</div><div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  __blen = __bend - __buf;</div><div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::noconv)</div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  {</div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  <span class="comment">// Same as the always_noconv case above.</span></div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  __buf = reinterpret_cast<char*>(__ibuf);</div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  __blen = __ilen;</div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  }</div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::_M_convert_to_external "</span></div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  <span class="stringliteral">"conversion error"</span>));</div><div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  </div><div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  __elen = _M_file.xsputn(__buf, __blen);</div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  __plen = __blen;</div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span> </div><div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  <span class="comment">// Try once more for partial conversions.</span></div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="keywordflow">if</span> (__r == codecvt_base::partial && __elen == __plen)</div><div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  {</div><div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  <span class="keyword">const</span> char_type* __iresume = __iend;</div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __rlen = this->pptr() - __iend;</div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  __r = _M_codecvt->out(_M_state_cur, __iresume,</div><div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  __iresume + __rlen, __iend, __buf,</div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  __buf + __blen, __bend);</div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="keywordflow">if</span> (__r != codecvt_base::error)</div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  {</div><div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  __rlen = __bend - __buf;</div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  __elen = _M_file.xsputn(__buf, __rlen);</div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  __plen = __rlen;</div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  }</div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::_M_convert_to_external "</span></div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  <span class="stringliteral">"conversion error"</span>));</div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  }</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  }</div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  <span class="keywordflow">return</span> __elen == __plen;</div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  }</div><div class="line"><a name="l00631"></a><span class="lineno"> 631</span> </div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a></div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00635"></a><span class="lineno"><a class="line" href="a02063.html#a4fb6d662a8351a9c790be9fbe78be8b4"> 635</a></span>  xsgetn(_CharT* __s, <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __n)</div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  {</div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="comment">// Clear out pback buffer before going on to the real deal...</span></div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ret = 0;</div><div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  <span class="keywordflow">if</span> (_M_pback_init)</div><div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  {</div><div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  <span class="keywordflow">if</span> (__n > 0 && this->gptr() == this->eback())</div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  {</div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  *__s++ = *this->gptr(); <span class="comment">// emulate non-underflowing sbumpc</span></div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  this->gbump(1);</div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  __ret = 1;</div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  --__n;</div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  }</div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  _M_destroy_pback();</div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  }</div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_writing)</div><div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  {</div><div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  <span class="keywordflow">if</span> (overflow() == traits_type::eof())</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  _M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  }</div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  </div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  <span class="comment">// Optimization in the always_noconv() case, to be generalized in the</span></div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  <span class="comment">// future: when __n > __buflen we read directly instead of using the</span></div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  <span class="comment">// buffer repeatedly.</span></div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testin = _M_mode & ios_base::in;</div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;</div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  </div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  <span class="keywordflow">if</span> (__n > __buflen && __check_facet(_M_codecvt).always_noconv()</div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  && __testin)</div><div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  {</div><div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  <span class="comment">// First, copy the chars already present in the buffer.</span></div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __avail = this->egptr() - this->gptr();</div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  <span class="keywordflow">if</span> (__avail != 0)</div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  {</div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  traits_type::copy(__s, this->gptr(), __avail);</div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  __s += __avail;</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  this->setg(this->eback(), this->gptr() + __avail, this->egptr());</div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  __ret += __avail;</div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  __n -= __avail;</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  }</div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  </div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="comment">// Need to loop in case of short reads (relatively common</span></div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  <span class="comment">// with pipes).</span></div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __len;</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  <span class="keywordflow">for</span> (;;)</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  {</div><div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  __len = _M_file.xsgetn(reinterpret_cast<char*>(__s), __n);</div><div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  <span class="keywordflow">if</span> (__len == -1)</div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  __throw_ios_failure(__N(<span class="stringliteral">"basic_filebuf::xsgetn "</span></div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  <span class="stringliteral">"error reading the file"</span>));</div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="keywordflow">if</span> (__len == 0)</div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  </div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  __n -= __len;</div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  __ret += __len;</div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  <span class="keywordflow">if</span> (__n == 0)</div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span> </div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  __s += __len;</div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  }</div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span> </div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  <span class="keywordflow">if</span> (__n == 0)</div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  {</div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <span class="comment">// Set _M_reading. Buffer is already in initial 'read' mode.</span></div><div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  _M_reading = <span class="keyword">true</span>;</div><div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  }</div><div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__len == 0)</div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  {</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  <span class="comment">// If end of file is reached, set 'uncommitted'</span></div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  <span class="comment">// mode, thus allowing an immediate write without</span></div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  <span class="comment">// an intervening seek.</span></div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  _M_reading = <span class="keyword">false</span>;</div><div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  }</div><div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  }</div><div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  __ret += __streambuf_type::xsgetn(__s, __n);</div><div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  </div><div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  }</div><div class="line"><a name="l00717"></a><span class="lineno"> 717</span> </div><div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a></div><div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00721"></a><span class="lineno"><a class="line" href="a02063.html#a9e78a1d5dec2c7eea816ada4e43d7576"> 721</a></span> <a class="code" href="a02063.html"> xsputn</a>(<span class="keyword">const</span> _CharT* __s, <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __n)</div><div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  {</div><div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ret = 0;</div><div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  <span class="comment">// Optimization in the always_noconv() case, to be generalized in the</span></div><div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  <span class="comment">// future: when __n is sufficiently large we write directly instead of</span></div><div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  <span class="comment">// using the buffer.</span></div><div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testout = (_M_mode & ios_base::out</div><div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  || _M_mode & ios_base::app);</div><div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv()</div><div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  && __testout && !_M_reading)</div><div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  {</div><div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  <span class="comment">// Measurement would reveal the best choice.</span></div><div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __chunk = 1ul << 10;</div><div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __bufavail = this->epptr() - this->pptr();</div><div class="line"><a name="l00735"></a><span class="lineno"> 735</span> </div><div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  <span class="comment">// Don't mistake 'uncommitted' mode buffered with unbuffered.</span></div><div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  <span class="keywordflow">if</span> (!_M_writing && _M_buf_size > 1)</div><div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  __bufavail = _M_buf_size - 1;</div><div class="line"><a name="l00739"></a><span class="lineno"> 739</span> </div><div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __limit = <a class="code" href="a01485.html#gad48656de2f272a953455e1fff2532125">std::min</a>(__chunk, __bufavail);</div><div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  <span class="keywordflow">if</span> (__n >= __limit)</div><div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  {</div><div class="line"><a name="l00743"></a><span class="lineno"> 743</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __buffill = this->pptr() - this->pbase();</div><div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* __buf = reinterpret_cast<const char*>(this->pbase());</div><div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  __ret = _M_file.xsputn_2(__buf, __buffill,</div><div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  reinterpret_cast<const char*>(__s),</div><div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  __n);</div><div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  <span class="keywordflow">if</span> (__ret == __buffill + __n)</div><div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  {</div><div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  _M_set_buffer(0);</div><div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  _M_writing = <span class="keyword">true</span>;</div><div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  }</div><div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  <span class="keywordflow">if</span> (__ret > __buffill)</div><div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  __ret -= __buffill;</div><div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  __ret = 0;</div><div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  }</div><div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  __ret = __streambuf_type::xsputn(__s, __n);</div><div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  }</div><div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  __ret = __streambuf_type::xsputn(__s, __n);</div><div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  }</div><div class="line"><a name="l00765"></a><span class="lineno"> 765</span> </div><div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  <span class="keyword">typename</span> <a class="code" href="a02455.html">basic_filebuf<_CharT, _Traits>::__streambuf_type</a>*</div><div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00769"></a><span class="lineno"><a class="line" href="a02063.html#afdc468aedafb80e43f14569d09485e6b"> 769</a></span> <a class="code" href="a02063.html"> setbuf</a>(<a class="code" href="a02455.html#a38ad1721a50a96c7d37d51a3f858a0cf">char_type</a>* __s, <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __n)</div><div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  {</div><div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  <span class="keywordflow">if</span> (!this->is_open())</div><div class="line"><a name="l00772"></a><span class="lineno"> 772</span>  {</div><div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  <span class="keywordflow">if</span> (__s == 0 && __n == 0)</div><div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  _M_buf_size = 1;</div><div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__s && __n > 0)</div><div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  {</div><div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  <span class="comment">// This is implementation-defined behavior, and assumes that</span></div><div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  <span class="comment">// an external char_type array of length __n exists and has</span></div><div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  <span class="comment">// been pre-allocated. If this is not the case, things will</span></div><div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  <span class="comment">// quickly blow up. When __n > 1, __n - 1 positions will be</span></div><div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  <span class="comment">// used for the get area, __n - 1 for the put area and 1</span></div><div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  <span class="comment">// position to host the overflow char of a full put area.</span></div><div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  <span class="comment">// When __n == 1, 1 position will be used for the get area</span></div><div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  <span class="comment">// and 0 for the put area, as in the unbuffered case above.</span></div><div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  _M_buf = __s;</div><div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  _M_buf_size = __n;</div><div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  }</div><div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  }</div><div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  <span class="keywordflow">return</span> <span class="keyword">this</span>;</div><div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  }</div><div class="line"><a name="l00791"></a><span class="lineno"> 791</span> </div><div class="line"><a name="l00792"></a><span class="lineno"> 792</span> </div><div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  <span class="comment">// According to 27.8.1.4 p11 - 13, seekoff should ignore the last</span></div><div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  <span class="comment">// argument (of type openmode).</span></div><div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::pos_type</div><div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00798"></a><span class="lineno"><a class="line" href="a02063.html#a0152beebcac8c9542b6b0efe3de5bbfb"> 798</a></span> <a class="code" href="a02063.html"> seekoff</a>(<a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a> __off, ios_base::seekdir __way, ios_base::openmode)</div><div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  {</div><div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  <span class="keywordtype">int</span> __width = 0;</div><div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  <span class="keywordflow">if</span> (_M_codecvt)</div><div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  __width = _M_codecvt->encoding();</div><div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  <span class="keywordflow">if</span> (__width < 0)</div><div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  __width = 0;</div><div class="line"><a name="l00805"></a><span class="lineno"> 805</span> </div><div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  <a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a> __ret = <a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a>(<a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>(-1));</div><div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __testfail = __off != 0 && __width <= 0;</div><div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  <span class="keywordflow">if</span> (this->is_open() && !__testfail)</div><div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  {</div><div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  <span class="comment">// tellg and tellp queries do not affect any state, unless</span></div><div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="comment">// ! always_noconv and the put sequence is not empty.</span></div><div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="comment">// In that case, determining the position requires converting the</span></div><div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  <span class="comment">// put sequence. That doesn't use ext_buf, so requires a flush.</span></div><div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  <span class="keywordtype">bool</span> __no_movement = __way == ios_base::cur && __off == 0</div><div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  && (!_M_writing || _M_codecvt->always_noconv());</div><div class="line"><a name="l00816"></a><span class="lineno"> 816</span> </div><div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  <span class="comment">// Ditch any pback buffers to avoid confusion.</span></div><div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  <span class="keywordflow">if</span> (!__no_movement)</div><div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  _M_destroy_pback();</div><div class="line"><a name="l00820"></a><span class="lineno"> 820</span> </div><div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  <span class="comment">// Correct state at destination. Note that this is the correct</span></div><div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  <span class="comment">// state for the current position during output, because</span></div><div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  <span class="comment">// codecvt::unshift() returns the state to the initial state.</span></div><div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  <span class="comment">// This is also the correct state at the end of the file because</span></div><div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  <span class="comment">// an unshift sequence should have been written at the end.</span></div><div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  __state_type __state = _M_state_beg;</div><div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  <a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a> __computed_off = __off * __width;</div><div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  <span class="keywordflow">if</span> (_M_reading && __way == ios_base::cur)</div><div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  {</div><div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  __state = _M_state_last;</div><div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  __computed_off += _M_get_ext_pos(__state);</div><div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  }</div><div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  <span class="keywordflow">if</span> (!__no_movement)</div><div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  __ret = _M_seek(__computed_off, __way, __state);</div><div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  {</div><div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  <span class="keywordflow">if</span> (_M_writing)</div><div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  __computed_off = this->pptr() - this->pbase();</div><div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  </div><div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  <a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a> __file_off = _M_file.seekoff(0, ios_base::cur);</div><div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  <span class="keywordflow">if</span> (__file_off != <a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>(-1))</div><div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  {</div><div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  __ret = __file_off + __computed_off;</div><div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  __ret.state(__state);</div><div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  }</div><div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  }</div><div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  }</div><div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  }</div><div class="line"><a name="l00850"></a><span class="lineno"> 850</span> </div><div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <span class="comment">// 171. Strange seekpos() semantics due to joint position</span></div><div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  <span class="comment">// According to the resolution of DR 171, seekpos should ignore the last</span></div><div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  <span class="comment">// argument (of type openmode).</span></div><div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::pos_type</div><div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00858"></a><span class="lineno"><a class="line" href="a02063.html#a91365d684bb298cb7ad42e3c73cd0252"> 858</a></span> <a class="code" href="a02063.html"> seekpos</a>(<a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a> __pos, ios_base::openmode)</div><div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  {</div><div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  <a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a> __ret = <a class="code" href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a>(<a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>(-1));</div><div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  <span class="keywordflow">if</span> (this->is_open())</div><div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  {</div><div class="line"><a name="l00863"></a><span class="lineno"> 863</span>  <span class="comment">// Ditch any pback buffers to avoid confusion.</span></div><div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  _M_destroy_pback();</div><div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  __ret = _M_seek(<a class="code" href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>(__pos), ios_base::beg, __pos.state());</div><div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  }</div><div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  }</div><div class="line"><a name="l00869"></a><span class="lineno"> 869</span> </div><div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  <span class="keyword">typename</span> basic_filebuf<_CharT, _Traits>::pos_type</div><div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00873"></a><span class="lineno"> 873</span> <a class="code" href="a02063.html"> _M_seek</a>(off_type __off, ios_base::seekdir __way, __state_type __state)</div><div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  {</div><div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  pos_type __ret = pos_type(off_type(-1));</div><div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  <span class="keywordflow">if</span> (_M_terminate_output())</div><div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  {</div><div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  off_type __file_off = _M_file.seekoff(__off, __way);</div><div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  <span class="keywordflow">if</span> (__file_off != off_type(-1))</div><div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  {</div><div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  _M_reading = <span class="keyword">false</span>;</div><div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  _M_writing = <span class="keyword">false</span>;</div><div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  _M_ext_next = _M_ext_end = _M_ext_buf;</div><div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  _M_set_buffer(-1);</div><div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  _M_state_cur = __state;</div><div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  __ret = __file_off;</div><div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  __ret.state(_M_state_cur);</div><div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  }</div><div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  }</div><div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  }</div><div class="line"><a name="l00892"></a><span class="lineno"> 892</span> </div><div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  <span class="comment">// Returns the distance from the end of the ext buffer to the point</span></div><div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  <span class="comment">// corresponding to gptr(). This is a negative value. Updates __state</span></div><div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  <span class="comment">// from eback() correspondence to gptr().</span></div><div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <span class="keywordtype">int</span> basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  _M_get_ext_pos(__state_type& __state)</div><div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  {</div><div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  <span class="keywordflow">if</span> (_M_codecvt->always_noconv())</div><div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  <span class="keywordflow">return</span> this->gptr() - this->egptr();</div><div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  {</div><div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  <span class="comment">// Calculate offset from _M_ext_buf that corresponds to</span></div><div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  <span class="comment">// gptr(). Precondition: __state == _M_state_last, which</span></div><div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  <span class="comment">// corresponds to eback().</span></div><div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> __gptr_off =</div><div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  _M_codecvt->length(__state, _M_ext_buf, _M_ext_next,</div><div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  this->gptr() - this->eback());</div><div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  <span class="keywordflow">return</span> _M_ext_buf + __gptr_off - _M_ext_end;</div><div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  }</div><div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  }</div><div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  </div><div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  _M_terminate_output()</div><div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  {</div><div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  <span class="comment">// Part one: update the output sequence.</span></div><div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  <span class="keywordtype">bool</span> __testvalid = <span class="keyword">true</span>;</div><div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  <span class="keywordflow">if</span> (this->pbase() < this->pptr())</div><div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  {</div><div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  <span class="keyword">const</span> int_type __tmp = this->overflow();</div><div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))</div><div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  __testvalid = <span class="keyword">false</span>;</div><div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  }</div><div class="line"><a name="l00927"></a><span class="lineno"> 927</span> </div><div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <span class="comment">// Part two: output unshift sequence.</span></div><div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  <span class="keywordflow">if</span> (_M_writing && !__check_facet(_M_codecvt).always_noconv()</div><div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  && __testvalid)</div><div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  {</div><div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  <span class="comment">// Note: this value is arbitrary, since there is no way to</span></div><div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  <span class="comment">// get the length of the unshift sequence from codecvt,</span></div><div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  <span class="comment">// without calling unshift.</span></div><div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> __blen = 128;</div><div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  <span class="keywordtype">char</span> __buf[__blen];</div><div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  codecvt_base::result __r;</div><div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __ilen = 0;</div><div class="line"><a name="l00939"></a><span class="lineno"> 939</span> </div><div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  {</div><div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  <span class="keywordtype">char</span>* __next;</div><div class="line"><a name="l00943"></a><span class="lineno"> 943</span>  __r = _M_codecvt->unshift(_M_state_cur, __buf,</div><div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  __buf + __blen, __next);</div><div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  <span class="keywordflow">if</span> (__r == codecvt_base::error)</div><div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  __testvalid = <span class="keyword">false</span>;</div><div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__r == codecvt_base::ok ||</div><div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  __r == codecvt_base::partial)</div><div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  {</div><div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  __ilen = __next - __buf;</div><div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  <span class="keywordflow">if</span> (__ilen > 0)</div><div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  {</div><div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __elen = _M_file.xsputn(__buf, __ilen);</div><div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  <span class="keywordflow">if</span> (__elen != __ilen)</div><div class="line"><a name="l00955"></a><span class="lineno"> 955</span>  __testvalid = <span class="keyword">false</span>;</div><div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  }</div><div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  }</div><div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  }</div><div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  <span class="keywordflow">while</span> (__r == codecvt_base::partial && __ilen > 0 && __testvalid);</div><div class="line"><a name="l00960"></a><span class="lineno"> 960</span> </div><div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <span class="keywordflow">if</span> (__testvalid)</div><div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  {</div><div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  <span class="comment">// This second call to overflow() is required by the standard,</span></div><div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  <span class="comment">// but it's not clear why it's needed, since the output buffer</span></div><div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  <span class="comment">// should be empty by this point (it should have been emptied</span></div><div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  <span class="comment">// in the first call to overflow()).</span></div><div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  <span class="keyword">const</span> int_type __tmp = this->overflow();</div><div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))</div><div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  __testvalid = <span class="keyword">false</span>;</div><div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  }</div><div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  }</div><div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  <span class="keywordflow">return</span> __testvalid;</div><div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  }</div><div class="line"><a name="l00974"></a><span class="lineno"> 974</span> </div><div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  <span class="keywordtype">int</span></div><div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  basic_filebuf<_CharT, _Traits>::</div><div class="line"><a name="l00978"></a><span class="lineno"><a class="line" href="a02063.html#af42cd30ec66c6eb0df56026098b6e04f"> 978</a></span>  sync()</div><div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  {</div><div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  <span class="comment">// Make sure that the internal buffer resyncs its idea of</span></div><div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="comment">// the file position with the external file.</span></div><div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  <span class="keywordtype">int</span> __ret = 0;</div><div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  <span class="keywordflow">if</span> (this->pbase() < this->pptr())</div><div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  {</div><div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  <span class="keyword">const</span> <a class="code" href="a02455.html#a1c1565d5b66e703de4d9a8aef4957a8b">int_type</a> __tmp = this->overflow();</div><div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__tmp, traits_type::eof()))</div><div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  __ret = -1;</div><div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  }</div><div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  <span class="keywordflow">return</span> __ret;</div><div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  }</div><div class="line"><a name="l00991"></a><span class="lineno"> 991</span> </div><div class="line"><a name="l00992"></a><span class="lineno"> 992</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits></div><div class="line"><a name="l00993"></a><span class="lineno"> 993</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00994"></a><span class="lineno"> 994</span>  <a class="code" href="a02063.html">basic_filebuf<_CharT, _Traits>::</a></div><div class="line"><a name="l00995"></a><span class="lineno"> 995</span> <a class="code" href="a02063.html"> imbue</a>(<span class="keyword">const</span> <a class="code" href="a05819.html">locale</a>& __loc)</div><div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  {</div><div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  <span class="keywordtype">bool</span> __testvalid = <span class="keyword">true</span>;</div><div class="line"><a name="l00998"></a><span class="lineno"> 998</span> </div><div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  <span class="keyword">const</span> __codecvt_type* _M_codecvt_tmp = 0;</div><div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  <span class="keywordflow">if</span> (__builtin_expect(has_facet<__codecvt_type>(__loc), <span class="keyword">true</span>))</div><div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>  _M_codecvt_tmp = &use_facet<__codecvt_type>(__loc);</div><div class="line"><a name="l01002"></a><span class="lineno"> 1002</span> </div><div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  <span class="keywordflow">if</span> (this->is_open())</div><div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  {</div><div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>  <span class="comment">// encoding() == -1 is ok only at the beginning.</span></div><div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  <span class="keywordflow">if</span> ((_M_reading || _M_writing)</div><div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>  && __check_facet(_M_codecvt).encoding() == -1)</div><div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>  __testvalid = <span class="keyword">false</span>;</div><div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>  {</div><div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  <span class="keywordflow">if</span> (_M_reading)</div><div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>  {</div><div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>  <span class="keywordflow">if</span> (__check_facet(_M_codecvt).always_noconv())</div><div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>  {</div><div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>  <span class="keywordflow">if</span> (_M_codecvt_tmp</div><div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>  && !__check_facet(_M_codecvt_tmp).always_noconv())</div><div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  __testvalid = this->seekoff(0, ios_base::cur, _M_mode)</div><div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>  != pos_type(off_type(-1));</div><div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  }</div><div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l01021"></a><span class="lineno"> 1021</span>  {</div><div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>  <span class="comment">// External position corresponding to gptr().</span></div><div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>  _M_ext_next = _M_ext_buf</div><div class="line"><a name="l01024"></a><span class="lineno"> 1024</span>  + _M_codecvt->length(_M_state_last, _M_ext_buf,</div><div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  _M_ext_next,</div><div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>  this->gptr() - this->eback());</div><div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>  <span class="keyword">const</span> <a class="code" href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a> __remainder = _M_ext_end - _M_ext_next;</div><div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>  <span class="keywordflow">if</span> (__remainder)</div><div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);</div><div class="line"><a name="l01030"></a><span class="lineno"> 1030</span> </div><div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  _M_ext_next = _M_ext_buf;</div><div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  _M_ext_end = _M_ext_buf + __remainder;</div><div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  _M_set_buffer(-1);</div><div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  _M_state_last = _M_state_cur = _M_state_beg;</div><div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  }</div><div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>  }</div><div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (_M_writing && (__testvalid = _M_terminate_output()))</div><div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  _M_set_buffer(-1);</div><div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  }</div><div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  }</div><div class="line"><a name="l01041"></a><span class="lineno"> 1041</span> </div><div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  <span class="keywordflow">if</span> (__testvalid)</div><div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  _M_codecvt = _M_codecvt_tmp;</div><div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>  _M_codecvt = 0;</div><div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  }</div><div class="line"><a name="l01047"></a><span class="lineno"> 1047</span> </div><div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  <span class="comment">// Inhibit implicit instantiations for required instantiations,</span></div><div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>  <span class="comment">// which are defined via explicit instantiations elsewhere.</span></div><div class="line"><a name="l01050"></a><span class="lineno"> 1050</span> <span class="preprocessor">#if _GLIBCXX_EXTERN_TEMPLATE</span></div><div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_filebuf<char>;</div><div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_ifstream<char>;</div><div class="line"><a name="l01053"></a><span class="lineno"> 1053</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_ofstream<char>;</div><div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_fstream<char>;</div><div class="line"><a name="l01055"></a><span class="lineno"> 1055</span> </div><div class="line"><a name="l01056"></a><span class="lineno"> 1056</span> <span class="preprocessor">#ifdef _GLIBCXX_USE_WCHAR_T</span></div><div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_filebuf<wchar_t>;</div><div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_ifstream<wchar_t>;</div><div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_ofstream<wchar_t>;</div><div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>basic_fstream<wchar_t>;</div><div class="line"><a name="l01061"></a><span class="lineno"> 1061</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01062"></a><span class="lineno"> 1062</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l01063"></a><span class="lineno"> 1063</span> </div><div class="line"><a name="l01064"></a><span class="lineno"> 1064</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l01065"></a><span class="lineno"> 1065</span> } <span class="comment">// namespace std</span></div><div class="line"><a name="l01066"></a><span class="lineno"> 1066</span> </div><div class="line"><a name="l01067"></a><span class="lineno"> 1067</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="a05335_html"><div class="ttname"><a href="a05335.html">__cxxabiv1::__forced_unwind</a></div><div class="ttdoc">Thrown as part of forced unwinding.A magic placeholder class that can be caught by reference to recog...</div><div class="ttdef"><b>Definition:</b> <a href="a00314_source.html#l00048">cxxabi_forced.h:48</a></div></div>
<div class="ttc" id="a00422_html"><div class="ttname"><a href="a00422.html">move.h</a></div></div>
<div class="ttc" id="a05799_html"><div class="ttname"><a href="a05799.html">std::ios_base</a></div><div class="ttdoc">The base of the I/O class hierarchy.This class defines everything that can be defined about I/O that ...</div><div class="ttdef"><b>Definition:</b> <a href="a00383_source.html#l00228">ios_base.h:228</a></div></div>
<div class="ttc" id="a02063_html_a14cdd23152cee458aaa655cf9508f9a6"><div class="ttname"><a href="a02063.html#a14cdd23152cee458aaa655cf9508f9a6">std::basic_filebuf::_M_mode</a></div><div class="ttdeci">ios_base::openmode _M_mode</div><div class="ttdoc">Place to stash in || out || in | out settings for current filebuf.</div><div class="ttdef"><b>Definition:</b> <a href="a00068_source.html#l00121">fstream:121</a></div></div>
<div class="ttc" id="a01541_html_a05eef5582eb5de62b76db4916f7adb84"><div class="ttname"><a href="a01541.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div><div class="ttdeci">ptrdiff_t streamsize</div><div class="ttdoc">Integral type for I/O operation counts and buffer sizes.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00098">postypes.h:98</a></div></div>
<div class="ttc" id="a02455_html_a1c1565d5b66e703de4d9a8aef4957a8b"><div class="ttname"><a href="a02455.html#a1c1565d5b66e703de4d9a8aef4957a8b">std::basic_streambuf::int_type</a></div><div class="ttdeci">traits_type::int_type int_type</div><div class="ttdef"><b>Definition:</b> <a href="a00149_source.html#l00133">streambuf:133</a></div></div>
<div class="ttc" id="a02063_html_acde765e7a5ddaca79683176fe981cec1"><div class="ttname"><a href="a02063.html#acde765e7a5ddaca79683176fe981cec1">std::basic_filebuf::_M_reading</a></div><div class="ttdeci">bool _M_reading</div><div class="ttdef"><b>Definition:</b> <a href="a00068_source.html#l00155">fstream:155</a></div></div>
<div class="ttc" id="a02455_html"><div class="ttname"><a href="a02455.html">std::basic_streambuf</a></div><div class="ttdoc">The actual work of input and output (interface).</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00080">iosfwd:80</a></div></div>
<div class="ttc" id="a00314_html"><div class="ttname"><a href="a00314.html">cxxabi_forced.h</a></div></div>
<div class="ttc" id="a01541_html"><div class="ttname"><a href="a01541.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a01485_html_gad48656de2f272a953455e1fff2532125"><div class="ttname"><a href="a01485.html#gad48656de2f272a953455e1fff2532125">std::min</a></div><div class="ttdeci">_GLIBCXX14_CONSTEXPR const _Tp & min(const _Tp &, const _Tp &)</div><div class="ttdoc">This does what you think it does.</div><div class="ttdef"><b>Definition:</b> <a href="a00530_source.html#l00195">stl_algobase.h:195</a></div></div>
<div class="ttc" id="a02063_html"><div class="ttname"><a href="a02063.html">std::basic_filebuf</a></div><div class="ttdoc">The actual work of input and output (for files).</div><div class="ttdef"><b>Definition:</b> <a href="a00068_source.html#l00080">fstream:80</a></div></div>
<div class="ttc" id="a02063_html_af3d033b08f1641d4594fb5d21eb2db89"><div class="ttname"><a href="a02063.html#af3d033b08f1641d4594fb5d21eb2db89">std::basic_filebuf::_M_set_buffer</a></div><div class="ttdeci">void _M_set_buffer(streamsize __off)</div><div class="ttdef"><b>Definition:</b> <a href="a00068_source.html#l00443">fstream:443</a></div></div>
<div class="ttc" id="a01541_html_a579ff3807b61f57bda29d023b3918504"><div class="ttname"><a href="a01541.html#a579ff3807b61f57bda29d023b3918504">std::end</a></div><div class="ttdeci">constexpr const _Tp * end(initializer_list< _Tp > __ils) noexcept</div><div class="ttdoc">Return an iterator pointing to one past the last element of the initializer_list.</div><div class="ttdef"><b>Definition:</b> <a href="a00029_source.html#l00099">initializer_list:99</a></div></div>
<div class="ttc" id="a05819_html"><div class="ttname"><a href="a05819.html">std::locale</a></div><div class="ttdoc">Container class for localization functionality.The locale class is first a class wrapper for C librar...</div><div class="ttdef"><b>Definition:</b> <a href="a00392_source.html#l00062">locale_classes.h:62</a></div></div>
<div class="ttc" id="a02455_html_a38ad1721a50a96c7d37d51a3f858a0cf"><div class="ttname"><a href="a02455.html#a38ad1721a50a96c7d37d51a3f858a0cf">std::basic_streambuf::char_type</a></div><div class="ttdeci">_CharT char_type</div><div class="ttdef"><b>Definition:</b> <a href="a00149_source.html#l00131">streambuf:131</a></div></div>
<div class="ttc" id="a02455_html_a5bc758d8b84fa134386d3ab683b880aa"><div class="ttname"><a href="a02455.html#a5bc758d8b84fa134386d3ab683b880aa">std::basic_streambuf::pos_type</a></div><div class="ttdeci">traits_type::pos_type pos_type</div><div class="ttdef"><b>Definition:</b> <a href="a00149_source.html#l00134">streambuf:134</a></div></div>
<div class="ttc" id="a02063_html_add2d16a8965c490cd9b4cc95b958e09f"><div class="ttname"><a href="a02063.html#add2d16a8965c490cd9b4cc95b958e09f">std::basic_filebuf::basic_filebuf</a></div><div class="ttdeci">basic_filebuf()</div><div class="ttdoc">Does not open any files.</div><div class="ttdef"><b>Definition:</b> <a href="a00353_source.html#l00080">fstream.tcc:80</a></div></div>
<div class="ttc" id="a02455_html_ae0d813da6c3d39659299a6e7831ae265"><div class="ttname"><a href="a02455.html#ae0d813da6c3d39659299a6e7831ae265">std::basic_streambuf::off_type</a></div><div class="ttdeci">traits_type::off_type off_type</div><div class="ttdef"><b>Definition:</b> <a href="a00149_source.html#l00135">streambuf:135</a></div></div>
<div class="ttc" id="a02063_html_ad72dc61561f4420b36f9e626b4426433"><div class="ttname"><a href="a02063.html#ad72dc61561f4420b36f9e626b4426433">std::basic_filebuf::open</a></div><div class="ttdeci">__filebuf_type * open(const char *__s, ios_base::openmode __mode)</div><div class="ttdoc">Opens an external file.</div><div class="ttdef"><b>Definition:</b> <a href="a00353_source.html#l00179">fstream.tcc:179</a></div></div>
<div class="ttc" id="a02063_html_aa144642d688ad4c36807ce149e632995"><div class="ttname"><a href="a02063.html#aa144642d688ad4c36807ce149e632995">std::basic_filebuf::_M_pback_init</a></div><div class="ttdeci">bool _M_pback_init</div><div class="ttdef"><b>Definition:</b> <a href="a00068_source.html#l00167">fstream:167</a></div></div>
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