get_ref_dir(): add function for getting a ref_dir from a ref_entry

Convert all accesses of a ref_dir within a ref_entry to use this
function.  This function will later be responsible for reading loose
references from disk on demand.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index beb186c7c9a6451c54cf4c66ef6c0f88a25621d3..8d76004afc7bc4abb81c8f9dbee416bc9da6b2f7 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -171,6 +171,12 @@ struct ref_entry {
        char name[FLEX_ARRAY];
 };
 
+static struct ref_dir *get_ref_dir(struct ref_entry *entry)
+{
+       assert(entry->flag & REF_DIR);
+       return &entry->u.subdir;
+}
+
 static struct ref_entry *create_ref_entry(const char *refname,
                                          const unsigned char *sha1, int flag,
                                          int check_name)
@@ -195,7 +201,7 @@ static void clear_ref_dir(struct ref_dir *dir);
 static void free_ref_entry(struct ref_entry *entry)
 {
        if (entry->flag & REF_DIR)
-               clear_ref_dir(&entry->u.subdir);
+               clear_ref_dir(get_ref_dir(entry));
        free(entry);
 }
 
@@ -320,7 +326,7 @@ static struct ref_dir *find_containing_dir(struct ref_dir *dir,
                entry = search_for_subdir(dir, dirname.buf, mkdir);
                if (!entry)
                        break;
-               dir = &entry->u.subdir;
+               dir = get_ref_dir(entry);
        }
 
        strbuf_release(&dirname);
@@ -449,8 +455,9 @@ static int do_for_each_ref_in_dir(struct ref_dir *dir, int offset,
                struct ref_entry *entry = dir->entries[i];
                int retval;
                if (entry->flag & REF_DIR) {
-                       sort_ref_dir(&entry->u.subdir);
-                       retval = do_for_each_ref_in_dir(&entry->u.subdir, 0,
+                       struct ref_dir *subdir = get_ref_dir(entry);
+                       sort_ref_dir(subdir);
+                       retval = do_for_each_ref_in_dir(subdir, 0,
                                                        base, fn, trim, flags, cb_data);
                } else {
                        retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
@@ -495,10 +502,12 @@ static int do_for_each_ref_in_dirs(struct ref_dir *dir1,
                if (cmp == 0) {
                        if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
                                /* Both are directories; descend them in parallel. */
-                               sort_ref_dir(&e1->u.subdir);
-                               sort_ref_dir(&e2->u.subdir);
+                               struct ref_dir *subdir1 = get_ref_dir(e1);
+                               struct ref_dir *subdir2 = get_ref_dir(e2);
+                               sort_ref_dir(subdir1);
+                               sort_ref_dir(subdir2);
                                retval = do_for_each_ref_in_dirs(
-                                               &e1->u.subdir, &e2->u.subdir,
+                                               subdir1, subdir2,
                                                base, fn, trim, flags, cb_data);
                                i1++;
                                i2++;
@@ -521,9 +530,10 @@ static int do_for_each_ref_in_dirs(struct ref_dir *dir1,
                                i2++;
                        }
                        if (e->flag & REF_DIR) {
-                               sort_ref_dir(&e->u.subdir);
+                               struct ref_dir *subdir = get_ref_dir(e);
+                               sort_ref_dir(subdir);
                                retval = do_for_each_ref_in_dir(
-                                               &e->u.subdir, 0,
+                                               subdir, 0,
                                                base, fn, trim, flags, cb_data);
                        } else {
                                retval = do_one_ref(base, fn, trim, flags, cb_data, e);
@@ -751,11 +761,11 @@ static struct ref_dir *get_packed_refs(struct ref_cache *refs)
                        packed_refs_file = git_path("packed-refs");
                f = fopen(packed_refs_file, "r");
                if (f) {
-                       read_packed_refs(f, &refs->packed->u.subdir);
+                       read_packed_refs(f, get_ref_dir(refs->packed));
                        fclose(f);
                }
        }
-       return &refs->packed->u.subdir;
+       return get_ref_dir(refs->packed);
 }
 
 void add_packed_ref(const char *refname, const unsigned char *sha1)
@@ -809,7 +819,7 @@ static void read_loose_refs(struct ref_cache *refs, const char *dirname,
                } else if (S_ISDIR(st.st_mode)) {
                        strbuf_addch(&refname, '/');
                        read_loose_refs(refs, refname.buf,
-                                       &search_for_subdir(dir, refname.buf, 1)->u.subdir);
+                                       get_ref_dir(search_for_subdir(dir, refname.buf, 1)));
                } else {
                        if (*refs->name) {
                                hashclr(sha1);
@@ -836,10 +846,10 @@ static struct ref_dir *get_loose_refs(struct ref_cache *refs)
        if (!refs->loose) {
                refs->loose = create_dir_entry("");
                read_loose_refs(refs, "refs/",
-                               &search_for_subdir(&refs->loose->u.subdir,
-                                                  "refs/", 1)->u.subdir);
+                               get_ref_dir(search_for_subdir(get_ref_dir(refs->loose),
+                                                             "refs/", 1)));
        }
-       return &refs->loose->u.subdir;
+       return get_ref_dir(refs->loose);
 }
 
 /* We allow "recursive" symbolic refs. Only within reason, though */