dir: introduce readdir_skip_dot_and_dotdot() helper

Many places in the code were doing
    while ((d = readdir(dir)) != NULL) {
        if (is_dot_or_dotdot(d->d_name))
            continue;
        ...process d...
    }
Introduce a readdir_skip_dot_and_dotdot() helper to make that a one-liner:
    while ((d = readdir_skip_dot_and_dotdot(dir)) != NULL) {
        ...process d...
    }

This helper particularly simplifies checks for empty directories.

Also use this helper in read_cached_dir() so that our statistics are
consistent across platforms.  (In other words, read_cached_dir() should
have been using is_dot_or_dotdot() and skipping such entries, but did
not and left it to treat_path() to detect and mark such entries as
path_none.)

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

1 files changed, 1 insertions, 3 deletions

diff --git a/rerere.c b/rerere.c
index dee60dc6df..d83d58df4f 100644
--- a/rerere.c
+++ b/rerere.c
@@ -1190,13 +1190,11 @@ void rerere_gc(struct repository *r, struct string_list *rr)
 	if (!dir)
 		die_errno(_("unable to open rr-cache directory"));
 	/* Collect stale conflict IDs ... */
-	while ((e = readdir(dir))) {
+	while ((e = readdir_skip_dot_and_dotdot(dir))) {
 		struct rerere_dir *rr_dir;
 		struct rerere_id id;
 		int now_empty;
 
-		if (is_dot_or_dotdot(e->d_name))
-			continue;
 		if (!is_rr_cache_dirname(e->d_name))
 			continue; /* or should we remove e->d_name? */