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
diff --git a/buf.c b/buf.c
index d1756c4..6efc7b6 100644
--- a/buf.c
+++ b/buf.c
@@ -565,7 +565,7 @@
*/
xmlChar *
-xmlBufContent(const xmlBufPtr buf)
+xmlBufContent(const xmlBuf *buf)
{
if ((!buf) || (buf->error))
return NULL;
@@ -583,7 +583,7 @@
*/
xmlChar *
-xmlBufEnd(const xmlBufPtr buf)
+xmlBufEnd(xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return NULL;