io: Add missing calls to xmlInitParser

This is required after c9a46a9.

Should fix #782.

Author: nwellnhof

xmlIO.c

@@ -1572,6 +1572,8 @@ xmlParserInputBufferCreateFilenameInt(const char *URI, xmlCharEncoding enc,
     int ret;
     int i;
 
+    xmlInitParser();
+
     *out = NULL;
     if (URI == NULL)
         return(XML_ERR_ARGUMENT);
@@ -1679,6 +1681,8 @@ __xmlOutputBufferCreateFilename(const char *URI,
     int i = 0;
     char *unescaped = NULL;
 
+    xmlInitParser();
+
     if (URI == NULL)
         return(NULL);
 
@@ -2978,6 +2982,8 @@ int
 xmlRegisterInputCallbacks(xmlInputMatchCallback matchFunc,
 	xmlInputOpenCallback openFunc, xmlInputReadCallback readFunc,
 	xmlInputCloseCallback closeFunc) {
+    xmlInitParser();
+
     if (xmlInputCallbackNr >= MAX_INPUT_CALLBACK) {
 	return(-1);
     }
@@ -3009,6 +3015,8 @@ xmlRegisterDefaultInputCallbacks(void) {
 int
 xmlPopInputCallbacks(void)
 {
+    xmlInitParser();
+
     if (xmlInputCallbackNr <= 0)
         return(-1);
 
@@ -3026,6 +3034,8 @@ xmlPopInputCallbacks(void)
 void
 xmlCleanupInputCallbacks(void)
 {
+    xmlInitParser();
+
     xmlInputCallbackNr = 0;
 }
 
@@ -3045,6 +3055,8 @@ int
 xmlRegisterOutputCallbacks(xmlOutputMatchCallback matchFunc,
 	xmlOutputOpenCallback openFunc, xmlOutputWriteCallback writeFunc,
 	xmlOutputCloseCallback closeFunc) {
+    xmlInitParser();
+
     if (xmlOutputCallbackNr >= MAX_OUTPUT_CALLBACK) {
 	return(-1);
     }
@@ -3076,6 +3088,8 @@ xmlRegisterDefaultOutputCallbacks (void) {
 int
 xmlPopOutputCallbacks(void)
 {
+    xmlInitParser();
+
     if (xmlOutputCallbackNr <= 0)
         return(-1);
 
@@ -3093,6 +3107,8 @@ xmlPopOutputCallbacks(void)
 void
 xmlCleanupOutputCallbacks(void)
 {
+    xmlInitParser();
+
     xmlOutputCallbackNr = 0;
 }