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<div class="title">bitops.h</div> </div>
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<a href="bitops_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>  </div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#ifndef __BITOPS_H__</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#define __BITOPS_H__</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <sys/param.h></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BITS_PER_CHAR 8</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#define BITS_PER_LONG (BITS_PER_CHAR * sizeof(long))</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">/* Find last bit set:</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * the index of the last bit that's set, or 0 if value is zero.</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="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> _flsl(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> word)</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> {</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordflow">return</span> word ? <span class="keyword">sizeof</span>(long) * BITS_PER_CHAR - __builtin_clz(word) : 0;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</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="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> clear_bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bit, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *word)</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  *word &= ~(1 << bit);</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> }</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> set_bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bit, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *word)</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  *word |= (1 << bit);</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>  </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> bitmap_clear_bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *map, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bit)</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> {</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  clear_bit(bit % BITS_PER_LONG, &map[bit / BITS_PER_LONG]);</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> bitmap_set_bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *map, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bit)</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  set_bit(bit % BITS_PER_LONG, &map[bit / BITS_PER_LONG]);</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>  </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bitmap_get_bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *map,</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> bit)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> map[bit / BITS_PER_LONG] >> (bit % BITS_PER_LONG) & 1;</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>  </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> find_first_bit(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *addr,</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> size)</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> i = 0; i * BITS_PER_LONG < size; i++) {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (addr[i]) {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> MIN(i * BITS_PER_LONG + __builtin_ffsl(addr[i]) - 1, size);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</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="keywordflow">return</span> size;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> find_first_zero_bit(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *addr,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> size)</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> i = 0; i * BITS_PER_LONG < size; i++) {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (addr[i] != ~0ul) {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> MIN(i * BITS_PER_LONG + __builtin_ffsl(~addr[i]) - 1, size);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> size;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> }</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="preprocessor">#endif</span></div>
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