Fix dangerous casts

On Windows 64-bit, the size of long is 32-bit, thus any pointer to long cast is
not valid. In any case, one should use intptr_t and ptrdiff_t when casting
to integers. This commit attempts to fix all instances reported by GCC.
When relevant, I replaced code by the macros PTR_ADD, ALIGN_UP from system.h

Change-Id: I2273b0e8465d3c4689824717ed5afa5ed238a2dc

1 files changed, 1 insertions, 1 deletions

diff --git a/apps/plugins/zxbox/tapefile.c b/apps/plugins/zxbox/tapefile.c
index b030f8dab9..054cae1aba 100644
--- a/apps/plugins/zxbox/tapefile.c
+++ b/apps/plugins/zxbox/tapefile.c
@@ -216,7 +216,7 @@ static struct tzxblock tzxb[NUMBLOCKID] = {
 };
 
 
-#define PTRDIFF(pe, ps) ((int) (((long) (pe) - (long) (ps)) / sizeof(*pe)))
+#define PTRDIFF(pe, ps) pe - ps
 
 static char tzxheader[] = {'Z','X','T','a','p','e','!',0x1A};