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<title>hash API</title>
</head>
<body>
<div id="header">
<h1>hash API</h1>
</div>
<div id="preamble">
<div class="sectionbody">
<div class="para"><p>The hash API is a collection of simple hash table functions. Users are expected
to implement their own hashing.</p></div>
</div>
</div>
<h2 id="_data_structures">Data Structures</h2>
<div class="sectionbody">
<div class="vlist"><dl>
<dt>
<tt>struct hash_table</tt>
</dt>
<dd>
<p>
The hash table structure. The <tt>array</tt> member points to the hash table
entries. The <tt>size</tt> member counts the total number of valid and invalid
entries in the table. The <tt>nr</tt> member keeps track of the number of
valid entries.
</p>
</dd>
<dt>
<tt>struct hash_table_entry</tt>
</dt>
<dd>
<p>
An opaque structure representing an entry in the hash table. The <tt>hash</tt>
member is the entry's hash key and the <tt>ptr</tt> member is the entry's
value.
</p>
</dd>
</dl></div>
</div>
<h2 id="_functions">Functions</h2>
<div class="sectionbody">
<div class="vlist"><dl>
<dt>
<tt>init_hash</tt>
</dt>
<dd>
<p>
Initialize the hash table.
</p>
</dd>
<dt>
<tt>free_hash</tt>
</dt>
<dd>
<p>
Release memory associated with the hash table.
</p>
</dd>
<dt>
<tt>insert_hash</tt>
</dt>
<dd>
<p>
Insert a pointer into the hash table. If an entry with that hash
already exists, a pointer to the existing entry's value is returned.
Otherwise NULL is returned. This allows callers to implement
chaining, etc.
</p>
</dd>
<dt>
<tt>lookup_hash</tt>
</dt>
<dd>
<p>
Lookup an entry in the hash table. If an entry with that hash exists
the entry's value is returned. Otherwise NULL is returned.
</p>
</dd>
<dt>
<tt>for_each_hash</tt>
</dt>
<dd>
<p>
Call a function for each entry in the hash table. The function is
expected to take the entry'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 id="footer">
<div id="footer-text">
Last updated 2010-09-18 23:57:11 UTC
</div>
</div>
</body>
</html>