libxml2-python: fix python3 malformed UTF8 strings

Signed-off-by: Jürgen Buchmüller <pullmoll@t-online.de>

srcpkgs/libxml2-python/patches/python3-utf8.patch

@@ -0,0 +1,37 @@
+Description: work around libxml2 python3 handling of UTF-8 encoded messages
+Author: Jan Matejek
+Source: https://bugzilla.opensuse.org/show_bug.cgi?id=1065270
+
+--- python/libxml.c
++++ python/libxml.c
+@@ -1620,6 +1620,7 @@ libxml_xmlErrorFuncHandler(ATTRIBUTE_UNU
+     PyObject *message;
+     PyObject *result;
+     char str[1000];
++    unsigned char *ptr = (unsigned char *)str;
+ 
+ #ifdef DEBUG_ERROR
+     printf("libxml_xmlErrorFuncHandler(%p, %s, ...) called\n", ctx, msg);
+@@ -1636,12 +1637,20 @@ libxml_xmlErrorFuncHandler(ATTRIBUTE_UNU
+ 	    str[999] = 0;
+         va_end(ap);
+ 
++#if PY_MAJOR_VERSION >= 3
++        /* Ensure the error string doesn't start at UTF8 continuation. */
++        while (*ptr && (*ptr & 0xc0) == 0x80)
++            ptr++;
++#endif
++
+         list = PyTuple_New(2);
+         PyTuple_SetItem(list, 0, libxml_xmlPythonErrorFuncCtxt);
+         Py_XINCREF(libxml_xmlPythonErrorFuncCtxt);
+-        message = libxml_charPtrConstWrap(str);
++        message = libxml_charPtrConstWrap(ptr);
+         PyTuple_SetItem(list, 1, message);
+         result = PyEval_CallObject(libxml_xmlPythonErrorFuncHandler, list);
++        /* Forget any errors caused in the error handler. */
++        PyErr_Clear();
+         Py_XDECREF(list);
+         Py_XDECREF(result);
+     }
+

srcpkgs/libxml2-python/template

@@ -1,7 +1,7 @@
 # Template file for 'libxml2-python'
 pkgname=libxml2-python
 version=2.9.9
-revision=2
+revision=3
 wrksrc="${pkgname%-python}-${version}"
 build_wrksrc=python
 build_style=python-module