xdiff: use ptrdiff_t for dstart/dend

ptrdiff_t is appropriate for dstart and dend because they both describe
positive or negative offsets relative to a pointer.

Signed-off-by: Ezekiel Newren <ezekielnewren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/xdiff/xtypes.h b/xdiff/xtypes.h
index f145abba3ea8a30f859dca127e3dda43fca8e07d..7a2d429ec5e7ea149f241fcb9cdd8a5a4dafec23 100644 (file)
--- a/xdiff/xtypes.h
+++ b/xdiff/xtypes.h
@@ -47,7 +47,7 @@ typedef struct s_xrecord {
 typedef struct s_xdfile {
        xrecord_t *recs;
        long nrec;
-       long dstart, dend;
+       ptrdiff_t dstart, dend;
        bool *changed;
        long *rindex;
        long nreff;