[libxml2] Fix IO callback signatures

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 86615e43bbac2315aa069ca3ef4712477d61605c
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Thu Nov 9 17:47:47 2017 +0100

    Fix IO callback signatures

 xmlIO.c     |    6 ++----
 xmllint.c   |   24 +++++++++++-------------
 xmlwriter.c |   12 +++++-------
 3 files changed, 18 insertions(+), 24 deletions(-)
---
diff --git a/xmlIO.c b/xmlIO.c
index 1d49095..e61e780 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -2843,10 +2843,8 @@ xmlOutputBufferCreateBuffer(xmlBufferPtr buffer,
 
     if (buffer == NULL) return(NULL);
 
-    ret = xmlOutputBufferCreateIO((xmlOutputWriteCallback)
-                                  xmlBufferWrite,
-                                  (xmlOutputCloseCallback)
-                                  NULL, (void *) buffer, encoder);
+    ret = xmlOutputBufferCreateIO(xmlBufferWrite, NULL, (void *) buffer,
+                                  encoder);
 
     return(ret);
 }
diff --git a/xmllint.c b/xmllint.c
index a691aa6..75d2f9b 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -814,13 +814,14 @@ xmlShellReadline(char *prompt) {
  *                                                                     *
  ************************************************************************/
 
-static int myRead(FILE *f, char * buf, int len) {
-    return(fread(buf, 1, len, f));
+static int myRead(void *f, char *buf, int len) {
+    return(fread(buf, 1, len, (FILE *) f));
 }
-static void myClose(FILE *f) {
-  if (f != stdin) {
-    fclose(f);
-  }
+static int myClose(void *context) {
+    FILE *f = (FILE *) context;
+    if (f == stdin)
+        return(0);
+    return(fclose(f));
 }
 
 /************************************************************************
@@ -2303,14 +2304,11 @@ static void parseAndPrintFile(char *filename, xmlParserCtxtPtr rectxt) {
 #endif
                if (f != NULL) {
                    if (rectxt == NULL)
-                       doc = xmlReadIO((xmlInputReadCallback) myRead,
-                                       (xmlInputCloseCallback) myClose, f,
-                                       filename, NULL, options);
+                       doc = xmlReadIO(myRead, myClose, f, filename, NULL,
+                                        options);
                    else
-                       doc = xmlCtxtReadIO(rectxt,
-                                       (xmlInputReadCallback) myRead,
-                                       (xmlInputCloseCallback) myClose, f,
-                                       filename, NULL, options);
+                       doc = xmlCtxtReadIO(rectxt, myRead, myClose, f,
+                                           filename, NULL, options);
                } else
                    doc = NULL;
            }
diff --git a/xmlwriter.c b/xmlwriter.c
index 2533a23..b5cd171 100644
--- a/xmlwriter.c
+++ b/xmlwriter.c
@@ -110,7 +110,7 @@ static void xmlFreeTextWriterNsStackEntry(xmlLinkPtr lk);
 static int xmlCmpTextWriterNsStackEntry(const void *data0,
                                         const void *data1);
 static int xmlTextWriterWriteDocCallback(void *context,
-                                         const xmlChar * str, int len);
+                                         const char *str, int len);
 static int xmlTextWriterCloseDocCallback(void *context);
 
 static xmlChar *xmlTextWriterVSprintf(const char *format, va_list argptr) LIBXML_ATTR_FORMAT(1,0);
@@ -325,9 +325,7 @@ xmlNewTextWriterPushParser(xmlParserCtxtPtr ctxt,
         return NULL;
     }
 
-    out = xmlOutputBufferCreateIO((xmlOutputWriteCallback)
-                                  xmlTextWriterWriteDocCallback,
-                                  (xmlOutputCloseCallback)
+    out = xmlOutputBufferCreateIO(xmlTextWriterWriteDocCallback,
                                   xmlTextWriterCloseDocCallback,
                                   (void *) ctxt, NULL);
     if (out == NULL) {
@@ -4418,12 +4416,12 @@ xmlCmpTextWriterNsStackEntry(const void *data0, const void *data1)
  * Returns -1, 0, 1
  */
 static int
-xmlTextWriterWriteDocCallback(void *context, const xmlChar * str, int len)
+xmlTextWriterWriteDocCallback(void *context, const char *str, int len)
 {
     xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) context;
     int rc;
 
-    if ((rc = xmlParseChunk(ctxt, (const char *) str, len, 0)) != 0) {
+    if ((rc = xmlParseChunk(ctxt, str, len, 0)) != 0) {
         xmlWriterErrMsgInt(NULL, XML_ERR_INTERNAL_ERROR,
                         "xmlTextWriterWriteDocCallback : XML error %d !\n",
                         rc);
@@ -4449,7 +4447,7 @@ xmlTextWriterCloseDocCallback(void *context)
 
     if ((rc = xmlParseChunk(ctxt, NULL, 0, 1)) != 0) {
         xmlWriterErrMsgInt(NULL, XML_ERR_INTERNAL_ERROR,
-                        "xmlTextWriterWriteDocCallback : XML error %d !\n",
+                        "xmlTextWriterCloseDocCallback : XML error %d !\n",
                         rc);
         return -1;
     }