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<a href="fdstream_8h.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 fdstream.h</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * @brief The following code declares classes to read from and write to</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * file descriptore or file handles.</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"> * See</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * http://www.josuttis.com/cppcode</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * for details and the latest version.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * - open:</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * - integrating BUFSIZ on some systems?</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * - optimized reading of multiple characters</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * - stream for reading AND writing</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * - i18n</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * (C) Copyright Nicolai M. Josuttis 2001.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * Permission to copy, use, modify, sell and distribute this software</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * is granted provided this copyright notice appears in all copies.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * This software is provided "as is" without express or implied</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * warranty, and with no claim as to its suitability for any purpose.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * Version: Jul 28, 2002</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * History:</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * Jul 28, 2002: bugfix memcpy() => memmove()</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * fdinbuf::underflow(): cast for return statements</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * Aug 05, 2001: first public version</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#ifndef BOOST_FDSTREAM_HPP</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"></span><span class="preprocessor">#define BOOST_FDSTREAM_HPP</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <istream></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <ostream></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <streambuf></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// for EOF:</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <cstdio></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// for memmove():</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <cstring></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</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="comment">// low-level read and write functions</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor"></span><span class="preprocessor"># include <io.h></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor"></span><span class="preprocessor"># include <unistd.h></span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">//extern "C" {</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// int write (int fd, const char* buf, int num);</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// int read (int fd, char* buf, int num);</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="preprocessor">#endif</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor"></span></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">// BEGIN namespace BOOST</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">namespace </span>std {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </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> <span class="comment">/************************************************************</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * fdostream</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * - a stream that writes on a file descriptor</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> ************************************************************/</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> </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="code" href="classstd_1_1fdoutbuf.html"> 61</a></span> <span class="keyword">class </span><a class="code" href="classstd_1_1fdoutbuf.html">fdoutbuf</a> : <span class="keyword">public</span> std::streambuf {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="code" href="classstd_1_1fdoutbuf.html#a7841f9fc9946834fef6c18aff5d39d3f"> 63</a></span>  <span class="keywordtype">int</span> <a class="code" href="classstd_1_1fdoutbuf.html#a7841f9fc9946834fef6c18aff5d39d3f">fd</a>; <span class="comment">// file descriptor</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// constructor</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="classstd_1_1fdoutbuf.html#a07d6a113e82ff68c8d28520917621235"> 66</a></span>  <a class="code" href="classstd_1_1fdoutbuf.html#a07d6a113e82ff68c8d28520917621235">fdoutbuf</a> (<span class="keywordtype">int</span> _fd) : <a class="code" href="classstd_1_1fdoutbuf.html#a7841f9fc9946834fef6c18aff5d39d3f">fd</a>(_fd) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// write one character</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="code" href="classstd_1_1fdoutbuf.html#ae716d47a80e05eac06f8d8c6d9b80efd"> 70</a></span>  <span class="keyword">virtual</span> int_type <a class="code" href="classstd_1_1fdoutbuf.html#ae716d47a80e05eac06f8d8c6d9b80efd">overflow</a> (int_type c) {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">if</span> (c != EOF) {</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">char</span> z = c;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">if</span> (write (<a class="code" href="classstd_1_1fdoutbuf.html#a7841f9fc9946834fef6c18aff5d39d3f">fd</a>, &z, 1) != 1) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> EOF;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</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>  <span class="keywordflow">return</span> c;</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">// write multiple characters</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">virtual</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="code" href="classstd_1_1fdoutbuf.html#a9f2e5d6e6a9aa3cfe375524f3bf2ff0b"> 81</a></span>  std::streamsize <a class="code" href="classstd_1_1fdoutbuf.html#a9f2e5d6e6a9aa3cfe375524f3bf2ff0b">xsputn</a> (<span class="keyword">const</span> <span class="keywordtype">char</span>* s,</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  std::streamsize num) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">return</span> write(<a class="code" href="classstd_1_1fdoutbuf.html#a7841f9fc9946834fef6c18aff5d39d3f">fd</a>,s,num);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> };</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="code" href="classstd_1_1fdostream.html"> 87</a></span> <span class="keyword">class </span><a class="code" href="classstd_1_1fdostream.html">fdostream</a> : <span class="keyword">public</span> std::ostream {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="code" href="classstd_1_1fdostream.html#ac63de0f0adad07b87f6016b3d28fd133"> 89</a></span>  <a class="code" href="classstd_1_1fdoutbuf.html">fdoutbuf</a> <a class="code" href="classstd_1_1fdostream.html#ac63de0f0adad07b87f6016b3d28fd133">buf</a>;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00091"></a><span class="lineno"><a class="code" href="classstd_1_1fdostream.html#a66d3a69bc255050f90f87a865e4ad8ca"> 91</a></span>  <a class="code" href="classstd_1_1fdostream.html#a66d3a69bc255050f90f87a865e4ad8ca">fdostream</a> (<span class="keywordtype">int</span> fd) : std::ostream(0), <a class="code" href="classstd_1_1fdostream.html#ac63de0f0adad07b87f6016b3d28fd133">buf</a>(fd) {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  rdbuf(&<a class="code" href="classstd_1_1fdostream.html#ac63de0f0adad07b87f6016b3d28fd133">buf</a>);</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> };</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </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> <span class="comment">/************************************************************</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * fdistream</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * - a stream that reads on a file descriptor</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> ************************************************************/</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html"> 102</a></span> <span class="keyword">class </span><a class="code" href="classstd_1_1fdinbuf.html">fdinbuf</a> : <span class="keyword">public</span> std::streambuf {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#afbb67f83be6cf75d2eee7001feccadf0"> 104</a></span>  <span class="keywordtype">int</span> <a class="code" href="classstd_1_1fdinbuf.html#afbb67f83be6cf75d2eee7001feccadf0">fd</a>; <span class="comment">// file descriptor</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">/* data buffer:</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * - at most, pbSize characters in putback area plus</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * - at most, bufSize characters in ordinary read buffer</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5"> 110</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a> = 4; <span class="comment">// size of putback area</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#a1ad9c07e2d54a707b532b5a764447b43"> 111</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="classstd_1_1fdinbuf.html#a1ad9c07e2d54a707b532b5a764447b43">bufSize</a> = 1024; <span class="comment">// size of the data buffer</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7"> 112</a></span>  <span class="keywordtype">char</span> <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>[<a class="code" href="classstd_1_1fdinbuf.html#a1ad9c07e2d54a707b532b5a764447b43">bufSize</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>]; <span class="comment">// data buffer</span></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>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">/* constructor</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * - initialize file descriptor</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * - initialize empty data buffer</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * - no putback area</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * => force underflow()</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#a8c17fd985fad9718d9a249e4ee31d0a1"> 121</a></span>  <a class="code" href="classstd_1_1fdinbuf.html#a8c17fd985fad9718d9a249e4ee31d0a1">fdinbuf</a> (<span class="keywordtype">int</span> _fd) : <a class="code" href="classstd_1_1fdinbuf.html#afbb67f83be6cf75d2eee7001feccadf0">fd</a>(_fd) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  setg (<a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>, <span class="comment">// beginning of putback area</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>, <span class="comment">// read position</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>); <span class="comment">// end position</span></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> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">// insert new characters into the buffer</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"><a class="code" href="classstd_1_1fdinbuf.html#a0ec8bd416990c0f15ed57b4bb970290a"> 129</a></span>  <span class="keyword">virtual</span> int_type <a class="code" href="classstd_1_1fdinbuf.html#a0ec8bd416990c0f15ed57b4bb970290a">underflow</a> () {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor">#ifndef _MSC_VER</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="preprocessor"></span> <span class="keyword">using</span> std::memmove;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// is read position before end of buffer?</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">if</span> (gptr() < egptr()) {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">return</span> traits_type::to_int_type(*gptr());</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="comment">/* process size of putback area</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> * - use number of characters read</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> * - but at most size of putback area</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordtype">int</span> numPutback;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  numPutback = gptr() - eback();</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">if</span> (numPutback > <a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>) {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  numPutback = <a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</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>  <span class="comment">/* copy up to pbSize characters previously read into</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * the putback area</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  memmove (<a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+(<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>-numPutback), gptr()-numPutback,</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  numPutback);</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>  <span class="comment">// read at most bufSize new characters</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordtype">int</span> num;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  num = read (<a class="code" href="classstd_1_1fdinbuf.html#afbb67f83be6cf75d2eee7001feccadf0">fd</a>, <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>, <a class="code" href="classstd_1_1fdinbuf.html#a1ad9c07e2d54a707b532b5a764447b43">bufSize</a>);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (num <= 0) {</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// ERROR or EOF</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> EOF;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</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="comment">// reset buffer pointers</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  setg (<a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+(<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>-numPutback), <span class="comment">// beginning of putback area</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>, <span class="comment">// read position</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <a class="code" href="classstd_1_1fdinbuf.html#ad722d71cdb24ec1b2dbefa66b63508b7">buffer</a>+<a class="code" href="classstd_1_1fdinbuf.html#a794741366eee0473eacf24a194e453d5">pbSize</a>+num); <span class="comment">// end of buffer</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="comment">// return next character</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">return</span> traits_type::to_int_type(*gptr());</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> };</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div>
<div class="line"><a name="l00173"></a><span class="lineno"><a class="code" href="classstd_1_1fdistream.html"> 173</a></span> <span class="keyword">class </span><a class="code" href="classstd_1_1fdistream.html">fdistream</a> : <span class="keyword">public</span> std::istream {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00175"></a><span class="lineno"><a class="code" href="classstd_1_1fdistream.html#a26b53ffa63279eec770d4bec9f10d3b2"> 175</a></span>  <a class="code" href="classstd_1_1fdinbuf.html">fdinbuf</a> <a class="code" href="classstd_1_1fdistream.html#a26b53ffa63279eec770d4bec9f10d3b2">buf</a>;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00177"></a><span class="lineno"><a class="code" href="classstd_1_1fdistream.html#a2617ced530f049add473d189c88f4ebc"> 177</a></span>  <a class="code" href="classstd_1_1fdistream.html#a2617ced530f049add473d189c88f4ebc">fdistream</a> (<span class="keywordtype">int</span> fd) : std::istream(0), <a class="code" href="classstd_1_1fdistream.html#a26b53ffa63279eec770d4bec9f10d3b2">buf</a>(fd) {</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  rdbuf(&<a class="code" href="classstd_1_1fdistream.html#a26b53ffa63279eec770d4bec9f10d3b2">buf</a>);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</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> </div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> } <span class="comment">// END namespace boost</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="preprocessor">#endif </span><span class="comment">/*BOOST_FDSTREAM_HPP*/</span><span class="preprocessor"></span></div>
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