Fix pointer/int cast warnings on 64-bit Windows

On 64-bit Windows, `long` is 32 bits wide and can't hold a pointer.
Switch to ptrdiff_t instead which should be the same size as a pointer
on every somewhat sane platform without requiring C99 types like
intptr_t.

Fixes bug 788312.

Thanks to J. Peter Mugaas for the report and initial patch.

1 files changed, 2 insertions, 1 deletions

diff --git a/tree.c b/tree.c
index 25364425..911aa103 100644
--- a/tree.c
+++ b/tree.c
@@ -19,6 +19,7 @@
 #include "libxml.h"
 
 #include <string.h> /* for memset() only ! */
+#include <stddef.h>
 #include <limits.h>
 #ifdef HAVE_CTYPE_H
 #include <ctype.h>
@@ -4605,7 +4606,7 @@ xmlGetLineNoInternal(const xmlNode *node, int depth)
 	(node->type == XML_PI_NODE)) {
 	if (node->line == 65535) {
 	    if ((node->type == XML_TEXT_NODE) && (node->psvi != NULL))
-	        result = (long) node->psvi;
+	        result = (long) (ptrdiff_t) node->psvi;
 	    else if ((node->type == XML_ELEMENT_NODE) &&
 	             (node->children != NULL))
 	        result = xmlGetLineNoInternal(node->children, depth + 1);