mufs: implement mufs_rmdir()

include/fs/mufs.h

@@ -48,6 +48,7 @@ struct mufs_dir *mufs_opendir(struct mufs *fs, const char *path);
 void mufs_closedir(struct mufs_dir *dir);
 int mufs_readdir(struct mufs_dir *dir, struct mufs_dirent *dirent);
 int mufs_mkdir(struct mufs *fs, const char *path);
+int mufs_rmdir(struct mufs *fs, const char *path);
 
 int mufs_create(struct mufs *fs, const char *path);
 struct mufs_file *mufs_open(struct mufs *fs, const char *path, int mode);

source/fs/mufs/dir.c

@@ -288,3 +288,16 @@ int mufs_mkdir(struct mufs *fs, const char *path)
 {
 	return mufs_mkpath(fs, path, MUFS_DIR);
 }
+
+int mufs_rmdir(struct mufs *fs, const char *path)
+{
+	struct mufs_stat stat;
+
+	if (mufs_stat(fs, path, &stat) < 0)
+		return -1;
+
+	if (stat.type != MUFS_DIR || stat.file_size != 0)
+		return -1;
+
+	return mufs_rmpath(fs, path);
+}