82 lines
3.8 KiB
HTML
82 lines
3.8 KiB
HTML
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<title>Looking Up or Entering a String - Untitled</title>
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<a name="Looking-Up-or-Entering-a-String"></a>Next: <a rel="next" accesskey="n" href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table">Traversing a Hash Table</a>,
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Previous: <a rel="previous" accesskey="p" href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table">Creating and Freeing a Hash Table</a>,
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<h4 class="subsection">2.18.2 Looking up or entering a string</h4>
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<p><a name="index-bfd_005fhash_005flookup-1388"></a>The function <code>bfd_hash_lookup</code> is used both to look up a
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string in the hash table and to create a new entry.
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<p>If the <var>create</var> argument is <code>FALSE</code>, <code>bfd_hash_lookup</code>
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will look up a string. If the string is found, it will
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returns a pointer to a <code>struct bfd_hash_entry</code>. If the
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string is not found in the table <code>bfd_hash_lookup</code> will
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return <code>NULL</code>. You should not modify any of the fields in
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the returns <code>struct bfd_hash_entry</code>.
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<p>If the <var>create</var> argument is <code>TRUE</code>, the string will be
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entered into the hash table if it is not already there.
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Either way a pointer to a <code>struct bfd_hash_entry</code> will be
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returned, either to the existing structure or to a newly
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created one. In this case, a <code>NULL</code> return means that an
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error occurred.
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<p>If the <var>create</var> argument is <code>TRUE</code>, and a new entry is
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created, the <var>copy</var> argument is used to decide whether to
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copy the string onto the hash table objalloc or not. If
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<var>copy</var> is passed as <code>FALSE</code>, you must be careful not to
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deallocate or modify the string as long as the hash table
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exists.
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