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<body class="article">
<div id="header">
<h1>hash API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The hash API is a collection of simple hash table functions. Users are expected
to implement their own hashing.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_data_structures">Data Structures</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<code>struct hash_table</code>
</dt>
<dd>
<p>
        The hash table structure. The <code>array</code> member points to the hash table
        entries. The <code>size</code> member counts the total number of valid and invalid
        entries in the table. The <code>nr</code> member keeps track of the number of
        valid entries.
</p>
</dd>
<dt class="hdlist1">
<code>struct hash_table_entry</code>
</dt>
<dd>
<p>
        An opaque structure representing an entry in the hash table. The <code>hash</code>
        member is the entry&#8217;s hash key and the <code>ptr</code> member is the entry&#8217;s
        value.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_functions">Functions</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<code>init_hash</code>
</dt>
<dd>
<p>
        Initialize the hash table.
</p>
</dd>
<dt class="hdlist1">
<code>free_hash</code>
</dt>
<dd>
<p>
        Release memory associated with the hash table.
</p>
</dd>
<dt class="hdlist1">
<code>insert_hash</code>
</dt>
<dd>
<p>
        Insert a pointer into the hash table. If an entry with that hash
        already exists, a pointer to the existing entry&#8217;s value is returned.
        Otherwise NULL is returned.  This allows callers to implement
        chaining, etc.
</p>
</dd>
<dt class="hdlist1">
<code>lookup_hash</code>
</dt>
<dd>
<p>
        Lookup an entry in the hash table. If an entry with that hash exists
        the entry&#8217;s value is returned. Otherwise NULL is returned.
</p>
</dd>
<dt class="hdlist1">
<code>for_each_hash</code>
</dt>
<dd>
<p>
        Call a function for each entry in the hash table. The function is
        expected to take the entry&#8217;s value as its only argument and return an
        int. If the function returns a negative int the loop is aborted
        immediately.  Otherwise, the return value is accumulated and the sum
        returned upon completion of the loop.
</p>
</dd>
</dl></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
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<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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