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| <h3 class="section">5.9 <code>memmem</code>—find memory segment</h3> |
| |
| <p><a name="index-memmem-378"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <string.h> |
| char *memmem(const void *<var>s1</var>, size_t <var>l1</var>, const void *<var>s2</var>, |
| size_t <var>l2</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| |
| <p>Locates the first occurrence in the memory region pointed to |
| by <var>s1</var> with length <var>l1</var> of the sequence of bytes pointed |
| to by <var>s2</var> of length <var>l2</var>. If you already know the |
| lengths of your haystack and needle, <code>memmem</code> can be much |
| faster than <code>strstr</code>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| Returns a pointer to the located segment, or a null pointer if |
| <var>s2</var> is not found. If <var>l2</var> is 0, <var>s1</var> is returned. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>memmem</code> is a newlib extension. |
| |
| <p><code>memmem</code> requires no supporting OS subroutines. |
| |
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