[libxml2] Fix SAX2 builder in case of undefined element namespaces

[Daniel Veillard <veillard src gnome org>]

commit 77b77b1301e052d90e6a0967534a698506afcd86
Author: Daniel Veillard <veillard redhat com>
Date:   Thu Jan 26 19:11:02 2012 +0800

    Fix SAX2 builder in case of undefined element namespaces
    
    Work as in XML-1.0 before namespaces, and use prefix:localname
    as the new element name (and no namespace of course)
    Also fix 3 cases in the regression tests where the prefix: was
    erroneously dropped in such case

 SAX2.c                      |   25 +++++++++++++++++++++++--
 result/namespaces/err_7.xml |    2 +-
 result/xmlid/id_tst2.xml    |    2 +-
 result/xmlid/id_tst3.xml    |    2 +-
 4 files changed, 26 insertions(+), 5 deletions(-)
---
diff --git a/SAX2.c b/SAX2.c
index c0482c0..0c48d65 100644
--- a/SAX2.c
+++ b/SAX2.c
@@ -2163,6 +2163,7 @@ xmlSAX2StartElementNs(void *ctx,
     xmlNodePtr parent;
     xmlNsPtr last = NULL, ns;
     const xmlChar *uri, *pref;
+    xmlChar *lname = NULL;
     int i, j;
 
     if (ctx == NULL) return;
@@ -2182,6 +2183,20 @@ xmlSAX2StartElementNs(void *ctx,
     }
 
     /*
+     * Take care of the rare case of an undefined namespace prefix
+     */
+    if ((prefix != NULL) && (URI == NULL)) {
+        if (ctxt->dictNames) {
+	    const xmlChar *fullname;
+
+	    fullname = xmlDictQLookup(ctxt->dict, prefix, localname);
+	    if (fullname != NULL)
+	        localname = fullname;
+	} else {
+	    lname = xmlBuildQName(localname, prefix, NULL, 0);
+	}
+    }
+    /*
      * allocate the node
      */
     if (ctxt->freeElems != NULL) {
@@ -2194,7 +2209,10 @@ xmlSAX2StartElementNs(void *ctx,
 	if (ctxt->dictNames)
 	    ret->name = localname;
 	else {
-	    ret->name = xmlStrdup(localname);
+	    if (lname == NULL)
+		ret->name = xmlStrdup(localname);
+	    else
+	        ret->name = lname;
 	    if (ret->name == NULL) {
 	        xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElementNs");
 		return;
@@ -2206,8 +2224,11 @@ xmlSAX2StartElementNs(void *ctx,
 	if (ctxt->dictNames)
 	    ret = xmlNewDocNodeEatName(ctxt->myDoc, NULL, 
 	                               (xmlChar *) localname, NULL);
-	else
+	else if (lname == NULL)
 	    ret = xmlNewDocNode(ctxt->myDoc, NULL, localname, NULL);
+	else
+	    ret = xmlNewDocNodeEatName(ctxt->myDoc, NULL, 
+	                               (xmlChar *) lname, NULL);
 	if (ret == NULL) {
 	    xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElementNs");
 	    return;
diff --git a/result/namespaces/err_7.xml b/result/namespaces/err_7.xml
index f4e5164..4b4c662 100644
--- a/result/namespaces/err_7.xml
+++ b/result/namespaces/err_7.xml
@@ -1,2 +1,2 @@
 <?xml version="1.0"?>
-<foo/>
+<f:foo/>
diff --git a/result/xmlid/id_tst2.xml b/result/xmlid/id_tst2.xml
index 33ee896..856a320 100644
--- a/result/xmlid/id_tst2.xml
+++ b/result/xmlid/id_tst2.xml
@@ -1,6 +1,6 @@
 Object is a Node Set :
 Set contains 1 nodes:
-1  ELEMENT foo
+1  ELEMENT n:foo
     ATTRIBUTE id
       TEXT
         content=bar
diff --git a/result/xmlid/id_tst3.xml b/result/xmlid/id_tst3.xml
index e2f8228..6d8865c 100644
--- a/result/xmlid/id_tst3.xml
+++ b/result/xmlid/id_tst3.xml
@@ -1,6 +1,6 @@
 Object is a Node Set :
 Set contains 1 nodes:
-1  ELEMENT o:o
+1  ELEMENT f:o:o
     ATTRIBUTE id
       TEXT
         content=bar