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<div class="title">stdio_sync_filebuf.h</div> </div>
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<a href="a01544.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">// Iostreams wrapper for stdio FILE* -*- 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) 2003-2013 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 ext/stdio_sync_filebuf.h</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This file is a GNU extension to the Standard C++ Library.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#ifndef _STDIO_SYNC_FILEBUF_H</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"></span><span class="preprocessor">#define _STDIO_SYNC_FILEBUF_H 1</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#pragma GCC system_header</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <<a class="code" href="a01572.html">streambuf</a>></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <<a class="code" href="a01146.html">cstdio</a>></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <<a class="code" href="a01071.html">bits/c++io.h</a>></span> <span class="comment">// For __c_file</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">#ifdef _GLIBCXX_USE_WCHAR_T</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor"></span><span class="preprocessor">#include <<a class="code" href="a01157.html">cwchar</a>></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">namespace </span>__gnu_cxx _GLIBCXX_VISIBILITY(default)</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * @brief Provides a layer of compatibility for C.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * @ingroup io</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * This GNU extension provides extensions for working with standard</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * C FILE*'s. It must be instantiated by the user with the type of</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * character used in the file stream, e.g., stdio_filebuf<char>.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _CharT, <span class="keyword">typename</span> _Traits = std::<span class="keywordtype">char</span>_traits<_CharT> ></div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="a00071.html"> 56</a></span>  <span class="keyword">class </span><a class="code" href="a00071.html">stdio_sync_filebuf</a> : <span class="keyword">public</span> <a class="code" href="a00452.html">std::basic_streambuf</a><_CharT, _Traits></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>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// Types:</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">typedef</span> _CharT <a class="code" href="a00452.html#a38ad1721a50a96c7d37d51a3f858a0cf">char_type</a>;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">typedef</span> _Traits <a class="code" href="a00452.html#ab3220592ca0efc72cf87e58cdc696bd6">traits_type</a>;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> traits_type::int_type int_type;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> traits_type::pos_type <a class="code" href="a00452.html#a5bc758d8b84fa134386d3ab683b880aa">pos_type</a>;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> traits_type::off_type <a class="code" href="a00452.html#ae0d813da6c3d39659299a6e7831ae265">off_type</a>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// Underlying stdio FILE</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  std::__c_file* <span class="keyword">const</span> _M_file;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// Last character gotten. This is used when pbackfail is</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// called from basic_streambuf::sungetc()</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  int_type _M_unget_buf;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">explicit</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="code" href="a00071.html">stdio_sync_filebuf</a>(std::__c_file* __f)</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  : _M_file(__f), _M_unget_buf(<a class="code" href="a00452.html#aada7a89966bf949f5abb88186c093775">traits_type::eof</a>())</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  { }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"></span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * @return The underlying FILE*.</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * This function can be used to access the underlying C file pointer.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * Note that there is no way for the library to track what you do</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * with the file, so be careful.</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  std::__c_file* <span class="keyword">const</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="a00071.html#aa250067fc8f952c119a4918dba5a1386"> 88</a></span>  <a class="code" href="a00071.html#aa250067fc8f952c119a4918dba5a1386">file</a>() { <span class="keywordflow">return</span> this->_M_file; }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  int_type</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  syncgetc();</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  int_type</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  syncungetc(int_type __c);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  int_type</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  syncputc(int_type __c);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">virtual</span> int_type</div>
<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="a00071.html#a4789b9e8139b3884909949d7ce9b15cd"> 101</a></span>  <a class="code" href="a00071.html#a4789b9e8139b3884909949d7ce9b15cd">underflow</a>()</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  int_type __c = this->syncgetc();</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> this->syncungetc(__c);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">virtual</span> int_type</div>
<div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="a00071.html#ad8647cc09ffa804cfe6b903b8415c9aa"> 108</a></span>  <a class="code" href="a00071.html#ad8647cc09ffa804cfe6b903b8415c9aa">uflow</a>()</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// Store the gotten character in case we need to unget it.</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  _M_unget_buf = this->syncgetc();</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> _M_unget_buf;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">virtual</span> int_type</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  pbackfail(int_type __c = traits_type::eof())</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  {</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  int_type __ret;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">const</span> int_type __eof = traits_type::eof();</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="comment">// Check if the unget or putback was requested</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__c, __eof)) <span class="comment">// unget</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (!traits_type::eq_int_type(_M_unget_buf, __eof))</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  __ret = this->syncungetc(_M_unget_buf);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">else</span> <span class="comment">// buffer invalid, fail.</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  __ret = __eof;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">else</span> <span class="comment">// putback</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  __ret = this->syncungetc(__c);</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// The buffered character is no longer valid, discard it.</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  _M_unget_buf = __eof;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> __ret;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keyword">virtual</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  xsgetn(char_type* __s, <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">virtual</span> int_type</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  overflow(int_type __c = traits_type::eof())</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  {</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  int_type __ret;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__c, traits_type::eof()))</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (std::fflush(_M_file))</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  __ret = <a class="code" href="a00452.html#aada7a89966bf949f5abb88186c093775">traits_type::eof</a>();</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  __ret = traits_type::not_eof(__c);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  }</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  __ret = this->syncputc(__c);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">return</span> __ret;</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> </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keyword">virtual</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  xsputn(<span class="keyword">const</span> char_type* __s, <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keyword">virtual</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"><a class="line" href="a00071.html#aaf870a6b01d27af87ca27c16e601d1df"> 160</a></span>  <a class="code" href="a00071.html#aaf870a6b01d27af87ca27c16e601d1df">sync</a>()</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  { <span class="keywordflow">return</span> std::fflush(_M_file); }</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keyword">virtual</span> <a class="code" href="a00728.html">std::streampos</a></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  seekoff(<a class="code" href="a01662.html#a48649c5c32f0251572b366063ee93032">std::streamoff</a> __off, std::ios_base::seekdir __dir,</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  std::ios_base::openmode = <a class="code" href="a00791.html#a652e2323949eea3d906e1c81bd8ce8f7">std::ios_base::in</a> | <a class="code" href="a00791.html#a7187e216e5d16ec820ea1791002f85e0">std::ios_base::out</a>)</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  {</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <a class="code" href="a00728.html">std::streampos</a> __ret(<a class="code" href="a01662.html#a48649c5c32f0251572b366063ee93032">std::streamoff</a>(-1));</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordtype">int</span> __whence;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (__dir == <a class="code" href="a00791.html#a214f784b4a9d7ce92eb23ed99e44aecf">std::ios_base::beg</a>)</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  __whence = SEEK_SET;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__dir == <a class="code" href="a00791.html#a1965600e26ca83d186504a4fd337cb9e">std::ios_base::cur</a>)</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  __whence = SEEK_CUR;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  __whence = SEEK_END;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="preprocessor">#ifdef _GLIBCXX_USE_LFS</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (!fseeko64(_M_file, __off, __whence))</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  __ret = <a class="code" href="a01662.html#a5894cfd4b461e2d4ed3b38402ff59c89">std::streampos</a>(ftello64(_M_file));</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (!fseek(_M_file, __off, __whence))</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  __ret = <a class="code" href="a01662.html#a5894cfd4b461e2d4ed3b38402ff59c89">std::streampos</a>(std::ftell(_M_file));</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="preprocessor"></span> <span class="keywordflow">return</span> __ret;</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> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keyword">virtual</span> <a class="code" href="a00728.html">std::streampos</a></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  seekpos(<a class="code" href="a00728.html">std::streampos</a> __pos,</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  std::ios_base::openmode __mode =</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <a class="code" href="a00791.html#a652e2323949eea3d906e1c81bd8ce8f7">std::ios_base::in</a> | <a class="code" href="a00791.html#a7187e216e5d16ec820ea1791002f85e0">std::ios_base::out</a>)</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  { <span class="keywordflow">return</span> seekoff(<a class="code" href="a01662.html#a48649c5c32f0251572b366063ee93032">std::streamoff</a>(__pos), <a class="code" href="a00791.html#a214f784b4a9d7ce92eb23ed99e44aecf">std::ios_base::beg</a>, __mode); }</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  };</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keyword">inline</span> stdio_sync_filebuf<char>::int_type</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  stdio_sync_filebuf<char>::syncgetc()</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  { <span class="keywordflow">return</span> std::getc(_M_file); }</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keyword">inline</span> stdio_sync_filebuf<char>::int_type</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  stdio_sync_filebuf<char>::syncungetc(int_type __c)</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  { <span class="keywordflow">return</span> std::ungetc(__c, _M_file); }</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keyword">inline</span> stdio_sync_filebuf<char>::int_type</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  stdio_sync_filebuf<char>::syncputc(int_type __c)</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  { <span class="keywordflow">return</span> std::putc(__c, _M_file); }</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="keyword">template</span><></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keyword">inline</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  stdio_sync_filebuf<char>::xsgetn(<span class="keywordtype">char</span>* __s, <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n)</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __ret = std::fread(__s, 1, __n, _M_file);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">if</span> (__ret > 0)</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  _M_unget_buf = traits_type::eof();</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">return</span> __ret;</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> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">inline</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  stdio_sync_filebuf<char>::xsputn(<span class="keyword">const</span> <span class="keywordtype">char</span>* __s, <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n)</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  { <span class="keywordflow">return</span> std::fwrite(__s, 1, __n, _M_file); }</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="preprocessor">#ifdef _GLIBCXX_USE_WCHAR_T</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="preprocessor"></span> <span class="keyword">template</span><></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keyword">inline</span> stdio_sync_filebuf<wchar_t>::int_type</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  stdio_sync_filebuf<wchar_t>::syncgetc()</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  { <span class="keywordflow">return</span> std::getwc(_M_file); }</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keyword">inline</span> stdio_sync_filebuf<wchar_t>::int_type</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  stdio_sync_filebuf<wchar_t>::syncungetc(int_type __c)</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  { <span class="keywordflow">return</span> std::ungetwc(__c, _M_file); }</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>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keyword">inline</span> stdio_sync_filebuf<wchar_t>::int_type</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  stdio_sync_filebuf<wchar_t>::syncputc(int_type __c)</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  { <span class="keywordflow">return</span> std::putwc(__c, _M_file); }</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keyword">inline</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  stdio_sync_filebuf<wchar_t>::xsgetn(<span class="keywordtype">wchar_t</span>* __s, <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n)</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>  <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __ret = 0;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keyword">const</span> int_type __eof = traits_type::eof();</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">while</span> (__n--)</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  {</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  int_type __c = this->syncgetc();</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(__c, __eof))</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  __s[__ret] = traits_type::to_char_type(__c);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  ++__ret;</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> </div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">if</span> (__ret > 0)</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  _M_unget_buf = traits_type::eof();</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">return</span> __ret;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  }</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">template</span><></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keyword">inline</span> <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  stdio_sync_filebuf<wchar_t>::xsputn(<span class="keyword">const</span> <span class="keywordtype">wchar_t</span>* __s,</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __n)</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  {</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <a class="code" href="a01662.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a> __ret = 0;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keyword">const</span> int_type __eof = traits_type::eof();</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">while</span> (__n--)</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  {</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordflow">if</span> (traits_type::eq_int_type(this->syncputc(*__s++), __eof))</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  ++__ret;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  }</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">return</span> __ret;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  }</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#if _GLIBCXX_EXTERN_TEMPLATE</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="preprocessor"></span> <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>stdio_sync_filebuf<char>;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <span class="preprocessor">#ifdef _GLIBCXX_USE_WCHAR_T</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="preprocessor"></span> <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>stdio_sync_filebuf<wchar_t>;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> _GLIBCXX_END_NAMESPACE_VERSION</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="a01071_html"><div class="ttname"><a href="a01071.html">c++io.h</a></div></div>
<div class="ttc" id="a00071_html_aa250067fc8f952c119a4918dba5a1386"><div class="ttname"><a href="a00071.html#aa250067fc8f952c119a4918dba5a1386">__gnu_cxx::stdio_sync_filebuf::file</a></div><div class="ttdeci">std::__c_file *const file()</div><div class="ttdef"><b>Definition:</b> <a href="a01544_source.html#l00088">stdio_sync_filebuf.h:88</a></div></div>
<div class="ttc" id="a01662_html_a5894cfd4b461e2d4ed3b38402ff59c89"><div class="ttname"><a href="a01662.html#a5894cfd4b461e2d4ed3b38402ff59c89">std::streampos</a></div><div class="ttdeci">fpos< mbstate_t > streampos</div><div class="ttdoc">File position for char streams. </div><div class="ttdef"><b>Definition:</b> <a href="a01426_source.html#l00228">postypes.h:228</a></div></div>
<div class="ttc" id="a00791_html_a214f784b4a9d7ce92eb23ed99e44aecf"><div class="ttname"><a href="a00791.html#a214f784b4a9d7ce92eb23ed99e44aecf">std::ios_base::beg</a></div><div class="ttdeci">static const seekdir beg</div><div class="ttdoc">Request a seek relative to the beginning of the stream. </div><div class="ttdef"><b>Definition:</b> <a href="a01315_source.html#l00396">ios_base.h:396</a></div></div>
<div class="ttc" id="a00452_html_ab3220592ca0efc72cf87e58cdc696bd6"><div class="ttname"><a href="a00452.html#ab3220592ca0efc72cf87e58cdc696bd6">std::basic_streambuf::traits_type</a></div><div class="ttdeci">_Traits traits_type</div><div class="ttdef"><b>Definition:</b> <a href="a01572_source.html#l00130">streambuf:130</a></div></div>
<div class="ttc" id="a01662_html_a05eef5582eb5de62b76db4916f7adb84"><div class="ttname"><a href="a01662.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="a01426_source.html#l00098">postypes.h:98</a></div></div>
<div class="ttc" id="a00071_html_a4789b9e8139b3884909949d7ce9b15cd"><div class="ttname"><a href="a00071.html#a4789b9e8139b3884909949d7ce9b15cd">__gnu_cxx::stdio_sync_filebuf::underflow</a></div><div class="ttdeci">virtual int_type underflow()</div><div class="ttdoc">Fetches more data from the controlled sequence. </div><div class="ttdef"><b>Definition:</b> <a href="a01544_source.html#l00101">stdio_sync_filebuf.h:101</a></div></div>
<div class="ttc" id="a01662_html_a48649c5c32f0251572b366063ee93032"><div class="ttname"><a href="a01662.html#a48649c5c32f0251572b366063ee93032">std::streamoff</a></div><div class="ttdeci">long long streamoff</div><div class="ttdoc">Type used by fpos, char_traits&lt;char&gt;, and char_traits&lt;wchar_t&gt;. </div><div class="ttdef"><b>Definition:</b> <a href="a01426_source.html#l00094">postypes.h:94</a></div></div>
<div class="ttc" id="a00071_html_ad8647cc09ffa804cfe6b903b8415c9aa"><div class="ttname"><a href="a00071.html#ad8647cc09ffa804cfe6b903b8415c9aa">__gnu_cxx::stdio_sync_filebuf::uflow</a></div><div class="ttdeci">virtual int_type uflow()</div><div class="ttdoc">Fetches more data from the controlled sequence. </div><div class="ttdef"><b>Definition:</b> <a href="a01544_source.html#l00108">stdio_sync_filebuf.h:108</a></div></div>
<div class="ttc" id="a00791_html_a652e2323949eea3d906e1c81bd8ce8f7"><div class="ttname"><a href="a00791.html#a652e2323949eea3d906e1c81bd8ce8f7">std::ios_base::in</a></div><div class="ttdeci">static const openmode in</div><div class="ttdoc">Open for input. Default for ifstream and fstream. </div><div class="ttdef"><b>Definition:</b> <a href="a01315_source.html#l00375">ios_base.h:375</a></div></div>
<div class="ttc" id="a01146_html"><div class="ttname"><a href="a01146.html">cstdio</a></div></div>
<div class="ttc" id="a00452_html"><div class="ttname"><a href="a00452.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="a01316_source.html#l00080">iosfwd:80</a></div></div>
<div class="ttc" id="a00452_html_aada7a89966bf949f5abb88186c093775"><div class="ttname"><a href="a00452.html#aada7a89966bf949f5abb88186c093775">std::basic_streambuf::eof</a></div><div class="ttdeci">virtual int_type return traits_type::eof()</div><div class="ttdoc">Tries to back up the input sequence. </div></div>
<div class="ttc" id="a00071_html_aaf870a6b01d27af87ca27c16e601d1df"><div class="ttname"><a href="a00071.html#aaf870a6b01d27af87ca27c16e601d1df">__gnu_cxx::stdio_sync_filebuf::sync</a></div><div class="ttdeci">virtual int sync()</div><div class="ttdoc">Synchronizes the buffer arrays with the controlled sequences. </div><div class="ttdef"><b>Definition:</b> <a href="a01544_source.html#l00160">stdio_sync_filebuf.h:160</a></div></div>
<div class="ttc" id="a01157_html"><div class="ttname"><a href="a01157.html">cwchar</a></div></div>
<div class="ttc" id="a00728_html"><div class="ttname"><a href="a00728.html">std::fpos</a></div><div class="ttdoc">Class representing stream positions. </div><div class="ttdef"><b>Definition:</b> <a href="a01426_source.html#l00112">postypes.h:112</a></div></div>
<div class="ttc" id="a01572_html"><div class="ttname"><a href="a01572.html">streambuf</a></div></div>
<div class="ttc" id="a00452_html_ae0d813da6c3d39659299a6e7831ae265"><div class="ttname"><a href="a00452.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="a01572_source.html#l00133">streambuf:133</a></div></div>
<div class="ttc" id="a00071_html"><div class="ttname"><a href="a00071.html">__gnu_cxx::stdio_sync_filebuf</a></div><div class="ttdoc">Provides a layer of compatibility for C.This GNU extension provides extensions for working with stand...</div><div class="ttdef"><b>Definition:</b> <a href="a01544_source.html#l00056">stdio_sync_filebuf.h:56</a></div></div>
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