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/object-file.c b/object-file.c
index 624af40..77bdcfd 100644
--- a/object-file.c
+++ b/object-file.c
@@ -2304,10 +2304,8 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
 	strbuf_addch(path, '/');
 	baselen = path->len;
 
-	while ((de = readdir(dir))) {
+	while ((de = readdir_skip_dot_and_dotdot(dir))) {
 		size_t namelen;
-		if (is_dot_or_dotdot(de->d_name))
-			continue;
 
 		namelen = strlen(de->d_name);
 		strbuf_setlen(path, baselen);