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<div id="projectname">Ruby
 <span id="projectnumber">1.9.3p551(2014-11-13revision48407)</span>
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<a href="../../de/df2/ffs_8c.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">/* ffs.c - find first set bit */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/* ffs() is defined by Single Unix Specification. */</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include "ruby.h"</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div>
<div class="line"><a name="l00006"></a><span class="lineno"><a class="line" href="../../de/df2/ffs_8c.html#a15b82144d3e24e0f5495a119909d2564"> 6</a></span> <span class="keywordtype">int</span> <a class="code" href="../../d3/d90/missing_8h.html#ab7a3e36d3032ed55666ca9a97d7ea672">ffs</a>(<span class="keywordtype">int</span> <a class="code" href="../../d3/d09/ripper_8y.html#ad608e57b446d6346a20ff2ce5ad16a13">arg</a>)</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> {</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> x = (<span class="keywordtype">unsigned</span> <a class="code" href="../../de/d07/bigdecimal_8c.html#accd5e629f58868c52137db996aaf8b83">int</a>)arg;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  <span class="keywordtype">int</span> <a class="code" href="../../de/d07/bigdecimal_8c.html#a514f1b439f404f86f77090fa9edc96ce">r</a>;</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="keywordflow">if</span> (x == 0)</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  r = 1;</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="preprocessor">#if 32 < SIZEOF_INT * CHAR_BIT</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> ((x & 0xffffffff) == 0) {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  x >>= 32;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  r += 32;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  }</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">if</span> ((x & 0xffff) == 0) {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  x >>= 16;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  r += 16;</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> </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">if</span> ((x & 0xff) == 0) {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  x >>= 8;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  r += 8;</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> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">if</span> ((x & 0xf) == 0) {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  x >>= 4;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  r += 4;</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> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> ((x & 0x3) == 0) {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  x >>= 2;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  r += 2;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  }</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">if</span> ((x & 0x1) == 0) {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  x >>= 1;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  r += 1;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> <a class="code" href="../../de/d07/bigdecimal_8c.html#a514f1b439f404f86f77090fa9edc96ce">r</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
<div class="ttc" id="bigdecimal_8c_html_accd5e629f58868c52137db996aaf8b83"><div class="ttname"><a href="../../de/d07/bigdecimal_8c.html#accd5e629f58868c52137db996aaf8b83">int</a></div><div class="ttdeci">VP_EXPORT int</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d07/bigdecimal_8c_source.html#l04911">bigdecimal.c:4911</a></div></div>
<div class="ttc" id="bigdecimal_8c_html_a514f1b439f404f86f77090fa9edc96ce"><div class="ttname"><a href="../../de/d07/bigdecimal_8c.html#a514f1b439f404f86f77090fa9edc96ce">r</a></div><div class="ttdeci">r</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d07/bigdecimal_8c_source.html#l01154">bigdecimal.c:1154</a></div></div>
<div class="ttc" id="ripper_8y_html_ad608e57b446d6346a20ff2ce5ad16a13"><div class="ttname"><a href="../../d3/d09/ripper_8y.html#ad608e57b446d6346a20ff2ce5ad16a13">arg</a></div><div class="ttdeci">arg</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d09/ripper_8y_source.html#l01287">ripper.y:1287</a></div></div>
<div class="ttc" id="missing_8h_html_ab7a3e36d3032ed55666ca9a97d7ea672"><div class="ttname"><a href="../../d3/d90/missing_8h.html#ab7a3e36d3032ed55666ca9a97d7ea672">ffs</a></div><div class="ttdeci">RUBY_EXTERN int ffs(int)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df2/ffs_8c_source.html#l00006">ffs.c:6</a></div></div>
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