[PATCH v5 14/17] builtin/repack.c: use named flags for existing_packs

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We use the `util` pointer for items in the `existing_packs` string list
to indicate which packs are going to be deleted. Since that has so far
been the only use of that `util` pointer, we just set it to 0 or 1.

But we're going to add an additional state to this field in the next
patch, so prepare for that by adding a #define for the first bit so we
can more expressively inspect the flags state.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 builtin/repack.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/builtin/repack.c b/builtin/repack.c
index b85483a148..36d1f03671 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -22,6 +22,8 @@
 #define LOOSEN_UNREACHABLE 2
 #define PACK_CRUFT 4
 
+#define DELETE_PACK 1
+
 static int pack_everything;
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
@@ -564,7 +566,7 @@ static void midx_included_packs(struct string_list *include,
 		}
 	} else {
 		for_each_string_list_item(item, existing_nonkept_packs) {
-			if (item->util)
+			if ((uintptr_t)item->util & DELETE_PACK)
 				continue;
 			string_list_insert(include, xstrfmt("%s.idx", item->string));
 		}
@@ -1002,7 +1004,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 			 * was given) and that we will actually delete this pack
 			 * (if `-d` was given).
 			 */
-			item->util = (void*)(intptr_t)!string_list_has_string(&names, sha1);
+			if (!string_list_has_string(&names, sha1))
+				item->util = (void*)(uintptr_t)((size_t)item->util | DELETE_PACK);
 		}
 	}
 
@@ -1026,7 +1029,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	if (delete_redundant) {
 		int opts = 0;
 		for_each_string_list_item(item, &existing_nonkept_packs) {
-			if (!item->util)
+			if (!((uintptr_t)item->util & DELETE_PACK))
 				continue;
 			remove_redundant_pack(packdir, item->string);
 		}
-- 
2.36.1.94.gb0d54bedca




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