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| <h3 class="section">11.1 <code>ffs</code>—find first bit set in a word</h3> |
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| <p><a name="index-ffs-458"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <strings.h> |
| int ffs(int <var>word</var>); |
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| </pre> |
| <p><strong>Description</strong><br> |
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| <p><code>ffs</code> returns the first bit set in a word. |
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| <p><br> |
| <strong>Returns</strong><br> |
| <code>ffs</code> returns 0 if <var>c</var> is 0, 1 if <var>c</var> is odd, 2 if <var>c</var> is a multiple of |
| 2, etc. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>ffs</code> is not ANSI C. |
| |
| <p>No supporting OS subroutines are required. |
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