snipt

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C

Solution to "How to read from standard input" by Bruno Haible. Original material from http://www.haible.de/bruno/mycat-blog.txt

#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int
main ()
{
  for (;;)
    {
      char buf[4096];
      ssize_t count = read (STDIN_FILENO, buf, sizeof (buf));
      if (count == 0)
        break;
      if (count < 0)
        {
#ifdef EINTR
          if (errno != EINTR)
#endif
            break;
        }
      if (count > 0)
        fwrite (buf, 1, count, stdout);
    }
  return 0;
}
https://snipt.net/embed/336bb99994fb927ac21f8f863d37e06e/
/raw/336bb99994fb927ac21f8f863d37e06e/
336bb99994fb927ac21f8f863d37e06e
c
C
26
2019-06-24T11:35:38
True
False
False
/api/public/snipt/28045/
solution-to-how-to-read-from-standard-input-by-bruno-haible-original-material-from-httpwwwhaibledebrunomycat-blogtxt
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="cp">#include</span> <span class="cpf">&lt;errno.h&gt;</span><span class="cp"></span> </span><span id="L-2"><a name="L-2"></a><span class="cp">#include</span> <span class="cpf">&lt;stdio.h&gt;</span><span class="cp"></span> </span><span id="L-3"><a name="L-3"></a><span class="cp">#include</span> <span class="cpf">&lt;sys/types.h&gt;</span><span class="cp"></span> </span><span id="L-4"><a name="L-4"></a><span class="cp">#include</span> <span class="cpf">&lt;unistd.h&gt;</span><span class="cp"></span> </span><span id="L-5"><a name="L-5"></a> </span><span id="L-6"><a name="L-6"></a><span class="kt">int</span> </span><span id="L-7"><a name="L-7"></a><span class="nf">main</span> <span class="p">()</span> </span><span id="L-8"><a name="L-8"></a><span class="p">{</span> </span><span id="L-9"><a name="L-9"></a> <span class="k">for</span> <span class="p">(;;)</span> </span><span id="L-10"><a name="L-10"></a> <span class="p">{</span> </span><span id="L-11"><a name="L-11"></a> <span class="kt">char</span> <span class="n">buf</span><span class="p">[</span><span class="mi">4096</span><span class="p">];</span> </span><span id="L-12"><a name="L-12"></a> <span class="kt">ssize_t</span> <span class="n">count</span> <span class="o">=</span> <span class="n">read</span> <span class="p">(</span><span class="n">STDIN_FILENO</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="k">sizeof</span> <span class="p">(</span><span class="n">buf</span><span class="p">));</span> </span><span id="L-13"><a name="L-13"></a> <span class="k">if</span> <span class="p">(</span><span class="n">count</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> </span><span id="L-14"><a name="L-14"></a> <span class="k">break</span><span class="p">;</span> </span><span id="L-15"><a name="L-15"></a> <span class="k">if</span> <span class="p">(</span><span class="n">count</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> </span><span id="L-16"><a name="L-16"></a> <span class="p">{</span> </span><span id="L-17"><a name="L-17"></a><span class="cp">#ifdef EINTR</span> </span><span id="L-18"><a name="L-18"></a> <span class="k">if</span> <span class="p">(</span><span class="n">errno</span> <span class="o">!=</span> <span class="n">EINTR</span><span class="p">)</span> </span><span id="L-19"><a name="L-19"></a><span class="cp">#endif</span> </span><span id="L-20"><a name="L-20"></a> <span class="k">break</span><span class="p">;</span> </span><span id="L-21"><a name="L-21"></a> <span class="p">}</span> </span><span id="L-22"><a name="L-22"></a> <span class="k">if</span> <span class="p">(</span><span class="n">count</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span> </span><span id="L-23"><a name="L-23"></a> <span class="n">fwrite</span> <span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">stdout</span><span class="p">);</span> </span><span id="L-24"><a name="L-24"></a> <span class="p">}</span> </span><span id="L-25"><a name="L-25"></a> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> </span><span id="L-26"><a name="L-26"></a><span class="p">}</span> </span></pre></div> </td></tr></table>
c, performance, pipe, stream, unix