XML_GetFeatureList(): New API function.

expat/doc/reference.html

@@ -116,6 +116,7 @@ Clark Cooper to retain copyright and to distribute it with expat.</p>
 		  <li><a href="#XML_DefaultCurrent">XML_DefaultCurrent</a></li>
 		  <li><a href="#XML_ExpatVersion">XML_ExpatVersion</a></li>
 		  <li><a href="#XML_ExpatVersionInfo">XML_ExpatVersionInfo</a></li>
+		  <li><a href="#XML_GetFeatureList">XML_GetFeatureList</a></li>
 	      </ul>
 	  </li>
       </ul>  
@@ -1652,6 +1653,23 @@ Testing these constants is currently the best way to determine if
 particular parts of the Expat API are available.
 </div>
 
+<pre class="fcndec" id="XML_GetFeatureList">
+const char **
+XML_GetFeatureList();
+</pre>
+<div class="fcndef">
+<p>Returns a list of "feature" identifiers that provide details on how
+Expat was configured at compile time.  Most applications should not
+need to worry about this, but this information is otherwise not
+available from Expat.  This function allows code that does need to
+check these features to do so at runtime.</p>
+
+<p>The return value is an array of strings, terminated by NULL,
+identifying the feature-test macros Expat was compiled with.  Common
+features which may be found in this list include
+<code>"XML_DTD"</code> and <code>"XML_UNICODE"</code>.
+</div>
+
 <hr />
 <p><a href="http://validator.w3.org/check/referer"><img
         src="valid-xhtml10.png" alt="Valid XHTML 1.0!"

expat/lib/expat.h

@@ -864,6 +864,9 @@ typedef struct {
 XMLPARSEAPI(XML_Expat_Version)
 XML_ExpatVersionInfo(void);
 
+XMLPARSEAPI(const char **)
+XML_GetFeatureList(void);
+
 
 /* Expat follows the GNU/Linux convention of odd number minor version for
    beta/development releases and even number minor version for stable

expat/lib/xmlparse.c

@@ -1584,7 +1584,8 @@ XML_ExpatVersion(void) {
 }
 
 XML_Expat_Version
-XML_ExpatVersionInfo(void) {
+XML_ExpatVersionInfo(void)
+{
   XML_Expat_Version version;
 
   version.major = XML_MAJOR_VERSION;
@@ -1594,6 +1595,24 @@ XML_ExpatVersionInfo(void) {
   return version;
 }
 
+const char **
+XML_GetFeatureList(void)
+{
+  static const char *features[] = {
+#ifdef XML_DTD
+    "XML_DTD",
+#endif
+#ifdef XML_UNICODE
+    "XML_UNICODE",
+#endif
+#ifdef XML_UNICODE_WCHAR_T
+    "XML_UNICODE_WCHAR_T",
+#endif
+    NULL
+  };
+  return features;
+}
+
 static
 enum XML_Error contentProcessor(XML_Parser parser,
                                 const char *start,