fix(cruby): stop clobbering libxml2 error handler on SAX parser init

This was leading to loss of error capture on extremely short HTML docs when encoding was not passed by the caller. This call was introduced in d23fe2c (#87) for reasons that are unclear, but we've come a long way with how we manage the global error handlers and so I think we're OK to stop doing this now.
sparklemotion · Dec 28, 2020 · 771164d · 771164d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -112,6 +112,7 @@ See note below about CVE-2020-26247 in the "Changed" subsection entitled "XML::S
 * [JRuby] XML::Schema XSD validation errors are captured in `XML::Schema#errors`. These errors were previously ignored.
 * [JRuby] Standardize reading from IO like objects, including StringIO. [[#1888](https://github.com/sparklemotion/nokogiri/issues/1888), [#1897](https://github.com/sparklemotion/nokogiri/issues/1897)]
 * [JRuby] Comparison of Node to Document with `Node#<=>` now matches CRuby/libxml2 behavior.
+* [CRuby] Syntax errors are now correctly captured in `Document#errors` for short HTML documents. Previously the SAX parser used for encoding detection was clobbering libxml2's global error handler.
 * [CRuby] Fixed installation on AIX with respect to `vasprintf`. [[#1908](https://github.com/sparklemotion/nokogiri/issues/1908)]
 * [CRuby] On some platforms, avoid symbol name collision with glibc's `canonicalize`. [[#2105](https://github.com/sparklemotion/nokogiri/issues/2105)]
 * [Windows Visual C++] Fixed compiler warnings and errors. [[#2061](https://github.com/sparklemotion/nokogiri/issues/2061), [#2068](https://github.com/sparklemotion/nokogiri/issues/2068)]

diff --git a/ext/nokogiri/xml_sax_parser.c b/ext/nokogiri/xml_sax_parser.c
@@ -259,8 +259,6 @@ static VALUE allocate(VALUE klass)
 {
   xmlSAXHandlerPtr handler = calloc((size_t)1, sizeof(xmlSAXHandler));
 
-  xmlSetStructuredErrorFunc(NULL, NULL);
-
   handler->startDocument = start_document;
   handler->endDocument = end_document;
   handler->startElement = start_element;

diff --git a/test/html/test_document_encoding.rb b/test/html/test_document_encoding.rb
@@ -142,6 +142,17 @@ def binopen(file)
             assert_equal(evil, ary_from_file)
           end
         end
+
+        describe "error handling" do
+          RAW = "<html><body><div"
+
+          {"read_memory" => RAW, "read_io" => StringIO.new(RAW)}.each do |flavor, input|
+            it "#{flavor} should handle errors" do
+              doc = Nokogiri::HTML.parse(input)
+              assert_operator(doc.errors.length, :>, 0)
+            end
+          end
+        end
       end
     end
   end