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<title>hash: Chained hash tables</title>
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<h2><span class="refentrytitle">hash</span></h2>
<p>hash - Chained hash tables</p>
<p>This module implements the hash table support used in various places in the library. </p>
<p>Author(s): Bjorn Reese <bjorn.reese@systematic.dk> </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">#define <a href="#XML_CAST_FPTR">XML_CAST_FPTR</a>(fptr);
typedef struct _xmlHashTable <a href="#xmlHashTable">xmlHashTable</a>;
typedef <a href="libxml2-hash.html#xmlHashTable">xmlHashTable</a> * <a href="#xmlHashTablePtr">xmlHashTablePtr</a>;
int <a href="#xmlHashAdd">xmlHashAdd</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload);
int <a href="#xmlHashAdd2">xmlHashAdd2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload);
int <a href="#xmlHashAdd3">xmlHashAdd3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload);
int <a href="#xmlHashAddEntry">xmlHashAddEntry</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload);
int <a href="#xmlHashAddEntry2">xmlHashAddEntry2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload);
int <a href="#xmlHashAddEntry3">xmlHashAddEntry3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload);
typedef void * <a href="#xmlHashCopier">xmlHashCopier</a> (void * payload, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name);
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> <a href="#xmlHashCopy">xmlHashCopy</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashCopier">xmlHashCopier</a> copy);
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> <a href="#xmlHashCopySafe">xmlHashCopySafe</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashCopier">xmlHashCopier</a> copyFunc, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> deallocFunc);
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> <a href="#xmlHashCreate">xmlHashCreate</a> (int size);
<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> <a href="#xmlHashCreateDict">xmlHashCreateDict</a> (int size, <br> <a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict);
typedef void <a href="#xmlHashDeallocator">xmlHashDeallocator</a> (void * payload, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name);
void <a href="#xmlHashDefaultDeallocator">xmlHashDefaultDeallocator</a> (void * entry, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key);
void <a href="#xmlHashFree">xmlHashFree</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
void * <a href="#xmlHashLookup">xmlHashLookup</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key);
void * <a href="#xmlHashLookup2">xmlHashLookup2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2);
void * <a href="#xmlHashLookup3">xmlHashLookup3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3);
void * <a href="#xmlHashQLookup">xmlHashQLookup</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name);
void * <a href="#xmlHashQLookup2">xmlHashQLookup2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2);
void * <a href="#xmlHashQLookup3">xmlHashQLookup3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix3, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3);
int <a href="#xmlHashRemoveEntry">xmlHashRemoveEntry</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
int <a href="#xmlHashRemoveEntry2">xmlHashRemoveEntry2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
int <a href="#xmlHashRemoveEntry3">xmlHashRemoveEntry3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
void <a href="#xmlHashScan">xmlHashScan</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> scan, <br> void * data);
void <a href="#xmlHashScan3">xmlHashScan3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> scan, <br> void * data);
void <a href="#xmlHashScanFull">xmlHashScanFull</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> scan, <br> void * data);
void <a href="#xmlHashScanFull3">xmlHashScanFull3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> scan, <br> void * data);
typedef void <a href="#xmlHashScanner">xmlHashScanner</a> (void * payload, <br> void * data, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name);
typedef void <a href="#xmlHashScannerFull">xmlHashScannerFull</a> (void * payload, <br> void * data, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3);
int <a href="#xmlHashSize">xmlHashSize</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash);
int <a href="#xmlHashUpdateEntry">xmlHashUpdateEntry</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
int <a href="#xmlHashUpdateEntry2">xmlHashUpdateEntry2</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
int <a href="#xmlHashUpdateEntry3">xmlHashUpdateEntry3</a> (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="XML_CAST_FPTR">Macro </a>XML_CAST_FPTR</h3>
<pre class="programlisting">#define <a href="#XML_CAST_FPTR">XML_CAST_FPTR</a>(fptr);
</pre>
<p>Macro to do a casting from an object pointer to a function pointer without encountering a warning from gcc #define XML_CAST_FPTR(fptr) (*(void **)(&fptr)) This macro violated ISO C aliasing rules (gcc4 on s390 broke) so it is disabled now</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>fptr</tt></i>:</span></td>
<td>pointer to a function</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashTable">Structure </a>xmlHashTable</h3>
<pre class="programlisting">struct _xmlHashTable {
The content of this structure is not made public by the API.
} xmlHashTable;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashTablePtr">Typedef </a>xmlHashTablePtr</h3>
<pre class="programlisting"><a href="libxml2-hash.html#xmlHashTable">xmlHashTable</a> * xmlHashTablePtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashCopier"></a>Function type xmlHashCopier</h3>
<pre class="programlisting">void * xmlHashCopier (void * payload, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br>
</pre>
<p>Callback to copy data from a hash.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>the data in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name associated</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a copy of the data or NULL in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashDeallocator"></a>Function type xmlHashDeallocator</h3>
<pre class="programlisting">void xmlHashDeallocator (void * payload, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br>
</pre>
<p>Callback to free data from a hash.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>the data in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name associated</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScanner"></a>Function type xmlHashScanner</h3>
<pre class="programlisting">void xmlHashScanner (void * payload, <br> void * data, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br>
</pre>
<p>Callback when scanning data in a hash with the simple scanner.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>the data in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra scanner data</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name associated</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScannerFull"></a>Function type xmlHashScannerFull</h3>
<pre class="programlisting">void xmlHashScannerFull (void * payload, <br> void * data, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3)<br>
</pre>
<p>Callback when scanning data in a hash with the full scanner.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>the data in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra scanner data</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name associated</td>
</tr>
<tr>
<td><span class="term"><i><tt>name2</tt></i>:</span></td>
<td>the second name associated</td>
</tr>
<tr>
<td><span class="term"><i><tt>name3</tt></i>:</span></td>
<td>the third name associated</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAdd"></a>xmlHashAdd ()</h3>
<pre class="programlisting">int xmlHashAdd (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload)<br>
</pre>
<p>Add a hash table entry. If an entry with this key already exists, payload will not be updated and 0 is returned. This return value can't be distinguished from out-of-memory errors, so this function should be used with care. Available since 2.13.0.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 on success, 0 if an entry exists and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAdd2"></a>xmlHashAdd2 ()</h3>
<pre class="programlisting">int xmlHashAdd2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload)<br>
</pre>
<p>Add a hash table entry with two strings as key. See <a href="libxml2-hash.html#xmlHashAdd">xmlHashAdd</a>. Available since 2.13.0.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 on success, 0 if an entry exists and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAdd3"></a>xmlHashAdd3 ()</h3>
<pre class="programlisting">int xmlHashAdd3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload)<br>
</pre>
<p>Add a hash table entry with three strings as key. See <a href="libxml2-hash.html#xmlHashAdd">xmlHashAdd</a>. Available since 2.13.0.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 on success, 0 if an entry exists and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAddEntry"></a>xmlHashAddEntry ()</h3>
<pre class="programlisting">int xmlHashAddEntry (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload)<br>
</pre>
<p>Add a hash table entry. If an entry with this key already exists, payload will not be updated and -1 is returned. This return value can't be distinguished from out-of-memory errors, so this function should be used with care. NOTE: This function doesn't allow to distinguish malloc failures from existing entries. Use <a href="libxml2-hash.html#xmlHashAdd">xmlHashAdd</a> instead.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAddEntry2"></a>xmlHashAddEntry2 ()</h3>
<pre class="programlisting">int xmlHashAddEntry2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload)<br>
</pre>
<p>Add a hash table entry with two strings as key. See <a href="libxml2-hash.html#xmlHashAddEntry">xmlHashAddEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashAddEntry3"></a>xmlHashAddEntry3 ()</h3>
<pre class="programlisting">int xmlHashAddEntry3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload)<br>
</pre>
<p>Add a hash table entry with three strings as key. See <a href="libxml2-hash.html#xmlHashAddEntry">xmlHashAddEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashCopy"></a>xmlHashCopy ()</h3>
<pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> xmlHashCopy (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashCopier">xmlHashCopier</a> copy)<br>
</pre>
<p>DEPRECATED: Leaks memory in error case. Copy the hash table using @copy to copy payloads.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>copy</tt></i>:</span></td>
<td>copier function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new table or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashCopySafe"></a>xmlHashCopySafe ()</h3>
<pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> xmlHashCopySafe (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashCopier">xmlHashCopier</a> copyFunc, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> deallocFunc)<br>
</pre>
<p>Copy the hash table using @copyFunc to copy payloads. Available since 2.13.0.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>copyFunc</tt></i>:</span></td>
<td>copier function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>deallocFunc</tt></i>:</span></td>
<td>deallocation function in case of errors</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new table or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashCreate"></a>xmlHashCreate ()</h3>
<pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> xmlHashCreate (int size)<br>
</pre>
<p>Create a new hash table. Set size to zero if the number of entries can't be estimated.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>size</tt></i>:</span></td>
<td>initial size of the hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created object, or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashCreateDict"></a>xmlHashCreateDict ()</h3>
<pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> xmlHashCreateDict (int size, <br> <a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br>
</pre>
<p>Create a new hash table backed by a dictionary. This can reduce resource usage considerably if most keys passed to API functions originate from this dictionary.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>size</tt></i>:</span></td>
<td>the size of the hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>a dictionary to use for the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created object, or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashDefaultDeallocator"></a>xmlHashDefaultDeallocator ()</h3>
<pre class="programlisting">void xmlHashDefaultDeallocator (void * entry, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key)<br>
</pre>
<p>Free a hash table entry with <a href="libxml2-xmlmemory.html#xmlFree">xmlFree</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>entry</tt></i>:</span></td>
<td>hash table entry</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>the entry's string key</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashFree"></a>xmlHashFree ()</h3>
<pre class="programlisting">void xmlHashFree (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Free the hash and its contents. The payload is deallocated with @dealloc if provided.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function or NULL</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashLookup"></a>xmlHashLookup ()</h3>
<pre class="programlisting">void * xmlHashLookup (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key)<br>
</pre>
<p>Find the entry specified by @key.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashLookup2"></a>xmlHashLookup2 ()</h3>
<pre class="programlisting">void * xmlHashLookup2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2)<br>
</pre>
<p>Find the payload specified by the (@key, @key2) tuple.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashLookup3"></a>xmlHashLookup3 ()</h3>
<pre class="programlisting">void * xmlHashLookup3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3)<br>
</pre>
<p>Find the payload specified by the (@key, @key2, @key3) tuple.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashQLookup"></a>xmlHashQLookup ()</h3>
<pre class="programlisting">void * xmlHashQLookup (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br>
</pre>
<p>Find the payload specified by the QName @prefix:@name or @name.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix</tt></i>:</span></td>
<td>prefix of the string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>local name of the string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashQLookup2"></a>xmlHashQLookup2 ()</h3>
<pre class="programlisting">void * xmlHashQLookup2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2)<br>
</pre>
<p>Find the payload specified by the QNames tuple.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix</tt></i>:</span></td>
<td>first prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>first local name</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix2</tt></i>:</span></td>
<td>second prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name2</tt></i>:</span></td>
<td>second local name</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashQLookup3"></a>xmlHashQLookup3 ()</h3>
<pre class="programlisting">void * xmlHashQLookup3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix3, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3)<br>
</pre>
<p>Find the payload specified by the QNames tuple.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix</tt></i>:</span></td>
<td>first prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>first local name</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix2</tt></i>:</span></td>
<td>second prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name2</tt></i>:</span></td>
<td>second local name</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix3</tt></i>:</span></td>
<td>third prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name3</tt></i>:</span></td>
<td>third local name</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the payload or NULL if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashRemoveEntry"></a>xmlHashRemoveEntry ()</h3>
<pre class="programlisting">int xmlHashRemoveEntry (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Find the entry specified by the @key and remove it from the hash table. Payload will be freed with @dealloc.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for removed item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 if no entry was found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashRemoveEntry2"></a>xmlHashRemoveEntry2 ()</h3>
<pre class="programlisting">int xmlHashRemoveEntry2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Remove an entry with two strings as key. See <a href="libxml2-hash.html#xmlHashRemoveEntry">xmlHashRemoveEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for removed item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashRemoveEntry3"></a>xmlHashRemoveEntry3 ()</h3>
<pre class="programlisting">int xmlHashRemoveEntry3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Remove an entry with three strings as key. See <a href="libxml2-hash.html#xmlHashRemoveEntry">xmlHashRemoveEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for removed item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScan"></a>xmlHashScan ()</h3>
<pre class="programlisting">void xmlHashScan (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> scan, <br> void * data)<br>
</pre>
<p>Scan the hash @table and apply @scan to each value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>scan</tt></i>:</span></td>
<td>scanner function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra data passed to @scan</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScan3"></a>xmlHashScan3 ()</h3>
<pre class="programlisting">void xmlHashScan3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> scan, <br> void * data)<br>
</pre>
<p>Scan the hash @table and apply @scan to each value matching (@key, @key2, @key3) tuple. If one of the keys is null, the comparison is considered to match.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>scan</tt></i>:</span></td>
<td>scanner function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra data passed to @scan</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScanFull"></a>xmlHashScanFull ()</h3>
<pre class="programlisting">void xmlHashScanFull (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> scan, <br> void * data)<br>
</pre>
<p>Scan the hash @table and apply @scan to each value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>scan</tt></i>:</span></td>
<td>scanner function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra data passed to @scan</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashScanFull3"></a>xmlHashScanFull3 ()</h3>
<pre class="programlisting">void xmlHashScanFull3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> scan, <br> void * data)<br>
</pre>
<p>Scan the hash @table and apply @scan to each value matching (@key, @key2, @key3) tuple. If one of the keys is null, the comparison is considered to match.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>scan</tt></i>:</span></td>
<td>scanner function for items in the hash</td>
</tr>
<tr>
<td><span class="term"><i><tt>data</tt></i>:</span></td>
<td>extra data passed to @scan</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashSize"></a>xmlHashSize ()</h3>
<pre class="programlisting">int xmlHashSize (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash)<br>
</pre>
<p>Query the number of elements in the hash table.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number of elements in the hash table or -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashUpdateEntry"></a>xmlHashUpdateEntry ()</h3>
<pre class="programlisting">int xmlHashUpdateEntry (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Add a hash table entry. If an entry with this key already exists, the old payload will be freed and updated with the new value.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for replaced item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 in case of success, -1 if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashUpdateEntry2"></a>xmlHashUpdateEntry2 ()</h3>
<pre class="programlisting">int xmlHashUpdateEntry2 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Add a hash table entry with two strings as key. See <a href="libxml2-hash.html#xmlHashUpdateEntry">xmlHashUpdateEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for replaced item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlHashUpdateEntry3"></a>xmlHashUpdateEntry3 ()</h3>
<pre class="programlisting">int xmlHashUpdateEntry3 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> hash, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key2, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * key3, <br> void * payload, <br> <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> dealloc)<br>
</pre>
<p>Add a hash table entry with three strings as key. See <a href="libxml2-hash.html#xmlHashUpdateEntry">xmlHashUpdateEntry</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>hash</tt></i>:</span></td>
<td>hash table</td>
</tr>
<tr>
<td><span class="term"><i><tt>key</tt></i>:</span></td>
<td>first string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key2</tt></i>:</span></td>
<td>second string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>key3</tt></i>:</span></td>
<td>third string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>payload</tt></i>:</span></td>
<td>pointer to the payload</td>
</tr>
<tr>
<td><span class="term"><i><tt>dealloc</tt></i>:</span></td>
<td>deallocator function for replaced item or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
</div>
</div>
</body>
</html>