bool filesys_chdir (const char* name)
{
struct dir* dir = containing_dir(name);
char* file_name = get_name(name);
struct inode *inode = NULL;
if (dir != NULL){
if (strcmp(file_name, "..") == 0){
//Check parent
if (!dir_parent(dir, &inode)){
free(file_name);
return false;
}
}
else if ((strlen(file_name) == 0 && (dir_is_root(dir))) || (strcmp(file_name, ".") == 0)){
thread_current()->cur_dir = dir;
free(file_name);
return true;
}else{
dir_lookup (dir, file_name, &inode);
}
}
dir_close (dir);
free(file_name);
dir = dir_open(inode);
if (dir)
{
dir_close(thread_current()->cur_dir);
thread_current()->cur_dir = dir;
return true;
}
return false;
}
/* Opens the file with the given NAME.
Returns the new file if successful or a null pointer
otherwise.
Fails if no file named NAME exists,
or if an internal memory allocation fails. */
struct file *
filesys_open (const char *name)
{
if (strlen(name) == 0)
{
return NULL;
}
struct dir *dir = get_containing_dir (name);
char* file_name = get_filename (name);
struct inode *inode = NULL;
if (dir != NULL)
{
if (strcmp(file_name, "..") == 0)
{
if (!dir_get_parent(dir, &inode))
{
free (file_name);
return NULL;
}
}
else if ((dir_is_root(dir) && strlen(file_name) == 0) ||
strcmp(file_name, ".") == 0)
{
free (file_name);
return (struct file*)dir;
}
else
{
dir_lookup(dir, file_name, &inode);
}
}
dir_close (dir);
free(file_name);
if (!inode)
{
return NULL;
}
if (inode_is_dir(inode))
{
return (struct file *)dir_open(inode);
}
return file_open (inode);
}
/* changes the current working directory to path */
bool filesys_chdir(const char *path)
{
struct dir *dir = get_containing_dir(path);
char *file_name = get_file_name(path);
struct inode *inode = NULL;
struct thread *cur = thread_current();
if (dir != NULL)
{
if(strcmp(file_name, "..") == 0)
{
if(!dir_get_parent(dir, &inode))
{
free(file_name);
return false;
}
}
else if(strcmp(file_name, ".") == 0)
{
cur->cwd = dir;
free(file_name);
return true;
}
else if(dir_is_root(dir) && strlen(file_name) == 0)
{
cur->cwd = dir;
free(file_name);
return true;
}
else
{
dir_lookup (dir, file_name, &inode);
}
}
dir_close(dir);
free(file_name);
dir = dir_open(inode);
if(dir != NULL)
{
dir_close(cur->cwd);
cur->cwd = dir;
return true;
}
return false;
}
