Fix and add const qualifiers

For https://bugzilla.gnome.org/show_bug.cgi?id=689483

It seems there are functions that do use the const qualifier for some of the
arguments, but it seems that there are a lot of functions that don't use it and
probably should.

So I created a patch against 2.9.0 that makes as much as possible const in
tree.h, and changed other files as needed.

There were a lot of cases like "const xmlNodePtr node".  This doesn't actually
do anything, there the *pointer* is constant not the object it points to. So I
changed those to "const xmlNode *node".

I also removed some consts, mostly in the Copy functions, because those
functions can actually modify the doc or node they copy from

1 files changed, 2 insertions, 2 deletions

diff --git a/buf.c b/buf.c
index d1756c4a..6efc7b67 100644
--- a/buf.c
+++ b/buf.c
@@ -565,7 +565,7 @@ xmlBufDump(FILE *file, xmlBufPtr buf) {
  */
 
 xmlChar *
-xmlBufContent(const xmlBufPtr buf)
+xmlBufContent(const xmlBuf *buf)
 {
     if ((!buf) || (buf->error))
         return NULL;
@@ -583,7 +583,7 @@ xmlBufContent(const xmlBufPtr buf)
  */
 
 xmlChar *
-xmlBufEnd(const xmlBufPtr buf)
+xmlBufEnd(xmlBufPtr buf)
 {
     if ((!buf) || (buf->error))
         return NULL;