From 9a93c6686f56086fe5280a85513041bbfebf41d0 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 29 Dec 2015 01:35:46 -0500 Subject: avoid shifting signed integers 31 bits We sometimes use 32-bit unsigned integers as bit-fields. It's fine to access the MSB, because it's unsigned. However, doing so as "1 << 31" is wrong, because the constant "1" is a signed int, and we shift into the sign bit, causing undefined behavior. We can fix this by using "1U" as the constant. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- diff.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'diff.h') diff --git a/diff.h b/diff.h index f7208ad103..893f446517 100644 --- a/diff.h +++ b/diff.h @@ -91,7 +91,7 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data) #define DIFF_OPT_DIRSTAT_BY_LINE (1 << 28) #define DIFF_OPT_FUNCCONTEXT (1 << 29) #define DIFF_OPT_PICKAXE_IGNORE_CASE (1 << 30) -#define DIFF_OPT_DEFAULT_FOLLOW_RENAMES (1 << 31) +#define DIFF_OPT_DEFAULT_FOLLOW_RENAMES (1U << 31) #define DIFF_OPT_TST(opts, flag) ((opts)->flags & DIFF_OPT_##flag) #define DIFF_OPT_TOUCHED(opts, flag) ((opts)->touched_flags & DIFF_OPT_##flag) -- cgit v1.2.3