[ 
https://issues.apache.org/jira/browse/XALANC-733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464808#comment-13464808
 ] 

Martin Elzen commented on XALANC-733:
-------------------------------------

the following patch against XalanLocator.hpp *as in rev 1389910* compiles on 
AIX, and after using it the samples/SimpleTransform executable seems to work 
okay : 
--- XalanLocator.hpp.orig    2012-09-27 17:08:30.936963206 +0200
+++ XalanLocator.hpp    2012-09-27 17:08:39.515962213 +0200
@@ -67,7 +67,7 @@
     static const XalanDOMChar*
     getPublicId(
             const Locator*          theLocator,
-            const XalanDOMChar*     theAlternateId = &s_dczero)
+            const XalanDOMChar*     theAlternateId = &( nullChar() ) )
     {
         return theLocator == 0 ? theAlternateId : (theLocator->getPublicId() ?
             theLocator->getPublicId() : theAlternateId);
@@ -76,7 +76,7 @@
     static const XalanDOMChar*
     getSystemId(
             const Locator*          theLocator,
-            const XalanDOMChar*     theAlternateId = &s_dczero)
+            const XalanDOMChar*     theAlternateId = &( nullChar() ) )
     {
         return theLocator == 0 ? theAlternateId : (theLocator->getSystemId() ?
             theLocator->getPublicId() : theAlternateId);
@@ -125,7 +125,13 @@
     XalanLocator&
     operator=(const XalanLocator&);
 
-    const static XalanDOMChar s_dczero = 0;
+    inline
+    static
+    const XalanDOMChar& nullChar()
+    {
+        const static XalanDOMChar sm_dczero = 0;
+        return sm_dczero;
+    }
 };

                
> Ensure that XalanLocator::getSystemId() and getPublicId() do not return NULL
> ----------------------------------------------------------------------------
>
>                 Key: XALANC-733
>                 URL: https://issues.apache.org/jira/browse/XALANC-733
>             Project: XalanC
>          Issue Type: Bug
>          Components: XalanC, XPathC
>    Affects Versions: 1.11
>            Reporter: Steven J. Hathaway
>            Assignee: Steven J. Hathaway
>         Attachments: XalanLocator-3.patch, XalanLocator.patch, 
> XalanLocator.patch2
>
>
> The recommended patch to "xalanc/PlatformSupport/XalanLocator.hpp"
> ensures that getSystemId() and getPublicId() do not return NULL pointers.
> XalanC source files that can benefit from the patch include:
> xalanc/PlatformSupport/ProblemListenerBase.cpp
> xalanc/PlatformSupport/XSLException.cpp
> xalanc/XPath/XPathExecutionContextDefault.cpp
> The patch will be submitted shortly.

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