From d5da27bcbc0b3495705ecd3f492425766f53f7ea Mon Sep 17 00:00:00 2001
From: rfm <richardfrithmacdonald@gmail.com>
Date: Thu, 19 Dec 2024 11:37:59 +0000
Subject: [PATCH] Fix error unlinking old namespace

---
 Source/NSXMLNode.m | 73 +++++++++++++++++++++++++++++-----------------
 1 file changed, 46 insertions(+), 27 deletions(-)

diff --git a/Source/NSXMLNode.m b/Source/NSXMLNode.m
index 1a1759348..5ebf4718b 100644
--- a/Source/NSXMLNode.m
+++ b/Source/NSXMLNode.m
@@ -39,8 +39,8 @@
   if ((node == NULL) || (ns == NULL))
     return;
 
-  if ((node->type == XML_ATTRIBUTE_NODE) ||
-      (node->type == XML_ELEMENT_NODE))
+  if ((node->type == XML_ATTRIBUTE_NODE)
+    || (node->type == XML_ELEMENT_NODE))
     {
       xmlNsPtr ns1 = node->ns;
       
@@ -50,19 +50,23 @@
         }
 
       // Either both the same or one NULL and the other the same
-      if (ns1 != NULL &&
-          (((ns1->href == NULL) &&
-            (xmlStrcmp(ns1->prefix, ns->prefix) == 0)) ||
-           /*
-           ((ns1->prefix == NULL) &&
-            (xmlStrcmp(ns1->href, ns->href) == 0)) ||
-           */
-           ((xmlStrcmp(ns1->prefix, ns->prefix) == 0) &&
-            (xmlStrcmp(ns1->href, ns->href) == 0))))
-        {
-          //xmlFreeNs(ns1);
-          xmlSetNs(node, ns);
-        }
+      if (ns1 != NULL)
+	{
+	  BOOL	equalPrefix;
+
+	  equalPrefix = (xmlStrcmp(ns1->prefix, ns->prefix) == 0) ? YES : NO;
+
+	  if (equalPrefix
+	    && ((ns1->href == NULL)
+	      || (xmlStrcmp(ns1->href, ns->href) == 0)))
+	    {
+	      xmlSetNs(node, ns);
+	      if (ns1->href != NULL)
+		{
+	          //xmlFreeNs(ns1);
+		}
+	    }
+	}
  
       cleanup_namespaces(node->children, ns);
       cleanup_namespaces(node->next, ns);
@@ -73,9 +77,11 @@
     }
 }
 
-void
+BOOL
 ensure_oldNs(xmlNodePtr node)
 {
+  BOOL	newDoc = NO;
+
   if (node->doc == NULL)
     {
       // Create a private document for this node
@@ -86,6 +92,7 @@
 #else
       xmlSetTreeDoc(node, tmp);
 #endif
+      newDoc = YES;
     }
   if (node->doc->oldNs == NULL)
     {
@@ -96,6 +103,7 @@
       ns->prefix = xmlStrdup((const xmlChar *)"xml");
       node->doc->oldNs = ns;
     }
+  return newDoc;
 }
 
 static int
@@ -551,11 +559,15 @@ - (void) _insertChild: (NSXMLNode*)child atIndex: (NSUInteger)index
       if (tmp)
         {
           // Try to resolve half defined namespaces
-          xmlNsPtr ns = tmp->oldNs;
+          xmlNsPtr ns;
           xmlNsPtr last = NULL;
 
-          ensure_oldNs(parentNode);
+	  if (ensure_oldNs(parentNode))
+	    {
+	      detached = parentNode->doc;
+	    }
 
+          ns = tmp->oldNs;
           while (ns != NULL)
             {
               BOOL resolved = NO;
@@ -594,7 +606,7 @@ - (void) _insertChild: (NSXMLNode*)child atIndex: (NSUInteger)index
                   // Unlink in old
                   if (last == NULL)
                     {
-                      tmp->oldNs = NULL;
+                      tmp->oldNs = tmp->oldNs->next;
                     }
                   else
                     {
@@ -1801,9 +1813,9 @@ - (void) setName: (NSString *)name
     }
   else
     {
-      const xmlChar *xmlName = XMLSTRING(name); 
-      xmlChar *prefix = NULL;
-      xmlChar *localName;
+      const xmlChar	*xmlName = XMLSTRING(name); 
+      xmlChar 		*prefix = NULL;
+      xmlChar 		*localName;
       
       if (NULL == xmlName)
         {
@@ -1814,8 +1826,8 @@ - (void) setName: (NSString *)name
       localName = xmlSplitQName2(xmlName, &prefix);
       if (prefix != NULL)
         {
-          if ((theNode->type == XML_ATTRIBUTE_NODE) ||
-              (theNode->type == XML_ELEMENT_NODE))
+          if ((theNode->type == XML_ATTRIBUTE_NODE)
+	    || (theNode->type == XML_ELEMENT_NODE))
             {
               if ((theNode->ns != NULL && theNode->ns->prefix == NULL))
                 {
@@ -1835,7 +1847,10 @@ - (void) setName: (NSString *)name
                     {
                       xmlNsPtr oldNs;
 
-                      ensure_oldNs(theNode);
+		      if (ensure_oldNs(theNode))
+			{
+			  detached = theNode->doc;
+			}
 
                       // Fake the name space and fix it later
                       // This function is private, so re reimplemt it.
@@ -1843,7 +1858,8 @@ - (void) setName: (NSString *)name
                       oldNs = theNode->doc->oldNs;
                       while (oldNs)
                         {
-                          if (oldNs->prefix != NULL && xmlStrEqual(oldNs->prefix, prefix))
+                          if (oldNs->prefix != NULL
+			    && xmlStrEqual(oldNs->prefix, prefix))
                             {
                               ns = oldNs;
                               break;
@@ -1964,7 +1980,10 @@ - (void) setURI: (NSString*)URI
             {
               xmlNsPtr oldNs;
               
-              ensure_oldNs(theNode);
+              if (ensure_oldNs(theNode))
+		{
+		  detached = theNode->doc;
+		}
               
               // Fake the name space and fix it later
               // This function is private, so re reimplemt it.