directory: added directory_is_root()

directory_is_root() is cheaper than
isRootDirectory(directory_get_path()).

src/dbUtils.c

@@ -64,9 +64,10 @@ static int
 printDirectoryInDirectory(struct directory *directory, void *data)
 {
 	struct client *client = data;
-	if (!isRootDirectory(directory->path)) {
+
+	if (!directory_is_root(directory))
 		client_printf(client, "directory: %s\n", directory_get_path(directory));
-	}
+
 	return 0;
 }
 
@@ -374,7 +375,7 @@ sumSavedFilenameMemoryInDirectory(struct directory *dir, void *data)
 {
 	int *sum = data;
 
-	if (isRootDirectory(dir->path))
+	if (directory_is_root(dir))
 		return 0;
 
 	*sum += (strlen(directory_get_path(dir)) + 1

src/directory.h

@@ -70,6 +70,15 @@ directory_get_path(const struct directory *directory)
 	return directory->path;
 }
 
+/**
+ * Is this the root directory of the music database?
+ */
+static inline bool
+directory_is_root(const struct directory *directory)
+{
+	return directory->parent == NULL;
+}
+
 /**
  * Returns the base name of the directory.
  */

src/directory_save.c

@@ -36,7 +36,7 @@ directory_save(FILE *fp, struct directory *directory)
 	size_t i;
 	int retv;
 
-	if (!isRootDirectory(directory->path)) {
+	if (!directory_is_root(directory)) {
 		retv = fprintf(fp, "%s%s\n", DIRECTORY_BEGIN,
 			       directory_get_path(directory));
 		if (retv < 0)
@@ -57,7 +57,7 @@ directory_save(FILE *fp, struct directory *directory)
 
 	songvec_save(fp, &directory->songs);
 
-	if (!isRootDirectory(directory->path) &&
+	if (!directory_is_root(directory) &&
 	    fprintf(fp, DIRECTORY_END "%s\n",
 		    directory_get_path(directory)) < 0)
 		return -1;

src/song.c

@@ -181,7 +181,7 @@ song_get_url(const struct song *song, char *path_max_tmp)
 	assert(song != NULL);
 	assert(*song->url);
 
-	if (!song->parent || isRootDirectory(song->parent->path))
+	if (!song_in_database(song) || directory_is_root(song->parent))
 		strcpy(path_max_tmp, song->url);
 	else
 		pfx_dir(path_max_tmp, song->url, strlen(song->url),

src/song_print.c

@@ -26,7 +26,7 @@
 void
 song_print_url(struct client *client, struct song *song)
 {
-	if (song->parent && !isRootDirectory(song->parent->path)) {
+	if (song_in_database(song) && !directory_is_root(song->parent)) {
 		client_printf(client, "%s%s/%s\n", SONG_FILE,
 			      directory_get_path(song->parent), song->url);
 	} else {

src/update.c

@@ -290,7 +290,7 @@ make_subdir(struct directory *parent, const char *name)
 	if (directory == NULL) {
 		char path[MPD_PATH_MAX];
 
-		if (isRootDirectory(directory_get_path(parent)))
+		if (directory_is_root(parent))
 			strcpy(path, name);
 		else
 			pfx_dir(path, name, strlen(name),