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-rw-r--r--xdiff/xutils.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index 1b3b471..277ccdf 100644
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -280,9 +280,11 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
#ifdef XDL_FAST_HASH
-#define ONEBYTES 0x0101010101010101ul
-#define NEWLINEBYTES 0x0a0a0a0a0a0a0a0aul
-#define HIGHBITS 0x8080808080808080ul
+#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
+
+#define ONEBYTES REPEAT_BYTE(0x01)
+#define NEWLINEBYTES REPEAT_BYTE(0x0a)
+#define HIGHBITS REPEAT_BYTE(0x80)
/* Return the high bit set in the first byte that is a zero */
static inline unsigned long has_zero(unsigned long a)