Fix some format string warnings with possible format string vulnerability
For https://bugzilla.gnome.org/show_bug.cgi?id=761029
Decorate every method in libxml2 with the appropriate
LIBXML_ATTR_FORMAT(fmt,args) macro and add some cleanups
following the reports.
diff --git a/xmlwriter.c b/xmlwriter.c
index fac20ac..69541b8 100644
--- a/xmlwriter.c
+++ b/xmlwriter.c
@@ -113,7 +113,7 @@
const xmlChar * str, int len);
static int xmlTextWriterCloseDocCallback(void *context);
-static xmlChar *xmlTextWriterVSprintf(const char *format, va_list argptr);
+static xmlChar *xmlTextWriterVSprintf(const char *format, va_list argptr) LIBXML_ATTR_FORMAT(1,0);
static int xmlOutputBufferWriteBase64(xmlOutputBufferPtr out, int len,
const unsigned char *data);
static void xmlTextWriterStartDocumentCallback(void *ctx);
@@ -153,7 +153,7 @@
*
* Handle a writer error
*/
-static void
+static void LIBXML_ATTR_FORMAT(3,0)
xmlWriterErrMsgInt(xmlTextWriterPtr ctxt, xmlParserErrors error,
const char *msg, int val)
{