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<div class="title">Kbhit.h</div> </div>
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<a href="../../dc/dd0/_kbhit_8h.xhtml">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">/*****************************************************************************</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">_kbhit() and _getch() for Linux/UNIX</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">Chris Giese <geezer@execpc.com> http://my.execpc.com/~geezer</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">Release date: ?</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">This code is public domain (no copyright).</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">You can do whatever you want with it.</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">*****************************************************************************/</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Modified work: Copyright (c) 2016, SLikeSoft UG (haftungsbeschränkt)</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * This source code was modified by SLikeSoft. Modifications in this file are put under the public domain.</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * Alternatively you are permitted to license the modifications under the MIT license, if you so desire. The</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * license can be found in the license.txt file in the root directory of this source tree.</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#if defined(_WIN32)</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor"></span><span class="preprocessor">#include <conio.h></span> <span class="comment">/* _kbhit(), _getch() */</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"></span><span class="preprocessor">#include <sys/time.h></span> <span class="comment">/* struct timeval, select() */</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">/* ICANON, ECHO, TCSANOW, struct termios */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <termios.h></span> <span class="comment">/* tcgetattr(), tcsetattr() */</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <stdlib.h></span> <span class="comment">/* atexit(), exit() */</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <unistd.h></span> <span class="comment">/* read() */</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <stdio.h></span> <span class="comment">/* printf() */</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="../../da/d66/string_8h.xhtml">string.h</a>></span> <span class="comment">/* memcpy */</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"><a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a9cb11cfdb0ccedf4d1100363933eaf1a"> 28</a></span> <span class="keyword">static</span> <span class="keyword">struct </span>termios <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a9cb11cfdb0ccedf4d1100363933eaf1a">g_old_kbd_mode</a>;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/*****************************************************************************</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">*****************************************************************************/</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#ab6a0eb9d27a9bae96d5e488bcb77b5ed"> 31</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#ab6a0eb9d27a9bae96d5e488bcb77b5ed">cooked</a>(<span class="keywordtype">void</span>)</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> {</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  tcsetattr(0, TCSANOW, &<a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a9cb11cfdb0ccedf4d1100363933eaf1a">g_old_kbd_mode</a>);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> }</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">/*****************************************************************************</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">*****************************************************************************/</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"><a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a91dd97230ebe40e2387a9f9b1eee7258"> 37</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a91dd97230ebe40e2387a9f9b1eee7258">raw</a>(<span class="keywordtype">void</span>)</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">static</span> <span class="keywordtype">char</span> init;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">struct </span>termios new_kbd_mode;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span>(init)</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">/* put keyboard (stdin, actually) in raw, unbuffered mode */</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  tcgetattr(0, &<a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a9cb11cfdb0ccedf4d1100363933eaf1a">g_old_kbd_mode</a>);</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  memcpy(&new_kbd_mode, &<a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a9cb11cfdb0ccedf4d1100363933eaf1a">g_old_kbd_mode</a>, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> termios));</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  new_kbd_mode.c_lflag &= ~(ICANON <span class="comment">/*| ECHO */</span> );</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  new_kbd_mode.c_cc[VTIME] = 0;</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  new_kbd_mode.c_cc[VMIN] = 1;</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  tcsetattr(0, TCSANOW, &new_kbd_mode);</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">/* when we exit, go back to normal, "cooked" mode */</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  atexit(<a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#ab6a0eb9d27a9bae96d5e488bcb77b5ed">cooked</a>);</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  init = 1;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">/*****************************************************************************</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">*****************************************************************************/</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"><a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#ae18f1497359ac3d85268e196eb67a77b"> 59</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#ae18f1497359ac3d85268e196eb67a77b">_kbhit</a>(<span class="keywordtype">void</span>)</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">struct </span>timeval timeout;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  fd_set read_handles;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">int</span> status;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a91dd97230ebe40e2387a9f9b1eee7258">raw</a>();</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">/* check stdin (fd 0) for activity */</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  FD_ZERO(&read_handles);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  FD_SET(0, &read_handles);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  timeout.tv_sec = timeout.tv_usec = 0;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  status = select(0 + 1, &read_handles, NULL, NULL, &timeout);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">if</span>(status < 0)</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  {</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  printf(<span class="stringliteral">"select() failed in _kbhit()\n"</span>);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  exit(1);</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> status;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">/*****************************************************************************</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">*****************************************************************************/</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"><a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a69d93081d75c65e3e355d1dbedf7ec0e"> 80</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a69d93081d75c65e3e355d1dbedf7ec0e">_getch</a>(<span class="keywordtype">void</span>)</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> {</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> temp;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <a class="code" href="../../dc/dd0/_kbhit_8h.xhtml#a91dd97230ebe40e2387a9f9b1eee7258">raw</a>();</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">/* stdin = fd 0 */</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span>(read(0, &temp, 1) != 1)</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> temp;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> }</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
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