refspec: drop separate raw_nr count

A refspec struct contains zero or more refspec_item structs, along with
matching "raw" strings. The items and raw strings are kept in separate
arrays, but those arrays will always have the same length (because we
write them only via refspec_append_nodup(), which grows both). This can
lead to bugs when manipulating the array, since the arrays and lengths
must be modified in lockstep. For example, the bug fixed in the previous
commit, which forgot to decrement raw_nr.

So let's get rid of "raw_nr" and have only "nr", making this kind of bug
impossible (and also making it clear that the two are always matched,
something that existing code already assumed but was not guaranteed by
the interface).

Even though we'd expect "alloc" and "raw_alloc" to likewise move in
lockstep, we still need to keep separate counts there if we want to
continue to use ALLOC_GROW() for both.

Conceptually this would all be simpler if refspec_item just held onto
its own raw string, and we had a single array. But there are callers
which use refspec_item outside of "struct refspec" (and so don't hold on
to a matching "raw" string at all), which we'd possibly need to adjust.
So let's not worry about refactoring that for now, and just get rid of
the redundant count variable. That is the first step on the road to
combining them anyway.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/refspec.c b/refspec.c
index c3cf003443..8e8ee8542d 100644
--- a/refspec.c
+++ b/refspec.c
@@ -186,10 +186,12 @@ static void refspec_append_nodup(struct refspec *rs, char *refspec)
 	refspec_item_init_or_die(&item, refspec, rs->fetch);
 
 	ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
-	rs->items[rs->nr++] = item;
+	rs->items[rs->nr] = item;
 
-	ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
-	rs->raw[rs->raw_nr++] = refspec;
+	ALLOC_GROW(rs->raw, rs->nr + 1, rs->raw_alloc);
+	rs->raw[rs->nr] = refspec;
+
+	rs->nr++;
 }
 
 void refspec_append(struct refspec *rs, const char *refspec)
@@ -217,18 +219,17 @@ void refspec_clear(struct refspec *rs)
 {
 	int i;
 
-	for (i = 0; i < rs->nr; i++)
+	for (i = 0; i < rs->nr; i++) {
 		refspec_item_clear(&rs->items[i]);
+		free(rs->raw[i]);
+	}
 
 	FREE_AND_NULL(rs->items);
 	rs->alloc = 0;
 	rs->nr = 0;
 
-	for (i = 0; i < rs->raw_nr; i++)
-		free(rs->raw[i]);
 	FREE_AND_NULL(rs->raw);
 	rs->raw_alloc = 0;
-	rs->raw_nr = 0;
 
 	rs->fetch = 0;
 }