/* 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)
{
char s[100];
char *save_ptr;
// printf("%s \n",name);
memcpy(s,name,strlen(name)+1);
struct inode *inode = NULL;
char *file_name = get_file_name(name);
// printf("file name : %s\n",file_name);
if( strtok_r(s,"/",&save_ptr) ==NULL&&strlen(name)>0 )
{
// printf("aaa\n");
free(file_name);
return file_open(inode_open(1));
}
if( strcmp(file_name,"")==0 )
return NULL;
struct dir *dir = get_directory(name);
// printf("sector of dir : %d\n", inode_get_inumber(dir_get_inode(dir)));
// printf("lookup start\n");
if (dir != NULL)
{
// printf("here?\n");
if(strcmp(file_name,".")==0)
{
// printf("here\n");
inode = dir_get_inode(dir);
// printf("ohhhhhh\n");
// dir_close (dir);
free(file_name);
if(inode_is_removed(inode))
return NULL;
else
return file_open (inode);
}
else if( strcmp(file_name,"..")==0)
{
inode = dir_get_inode(inode);
// dir_close (dir);
free(file_name);
return file_open (inode);
}
else
dir_lookup (dir, file_name, &inode);
dir_close (dir);
if(inode==NULL)
return NULL;
free(file_name);
return file_open (inode);
}
else
{
// printf("here\n");
return NULL;
}
// if(inode_is_removed(inode))
// return NULL;
// return file_open (inode);
}
/* Opens the directory for the given path. If the path is null, opens the
* CWD */
struct dir *
dir_open_path (const char *path)
{
block_sector_t sector = path_traverse (path, NULL);
if (sector == INODE_INVALID_BLOCK_SECTOR) return NULL;
struct dir *d = dir_open (inode_open (sector));
if (inode_is_removed (d->inode)) return NULL;
return d;
}
static struct dir *get_directory(char *path)
{
char s[1024];
memcpy(s,path,strlen(path)+1);
char *token, *save_ptr,*prev_token="", *next_token="";//,*save,*real;
token = strtok_r(s,"/",&save_ptr);
// real = strtok_r(token,"/",&save);
struct dir *start;
struct inode *inode;
if( s[0]=='/' || !thread_current()->curr_dir )
{
// printf("when create a/b\n");
start = dir_open_root();
}
else
{
// printf("come on\n");
if( inode_is_removed(dir_get_inode(thread_current()->curr_dir)))
return NULL;
else
start = dir_reopen(thread_current()->curr_dir);
}
/*
if( strcmp(token,"." )==0)
{
}
else if( strcmp(token,"..") == 0)
{
if( thread_current()->curr_dir)
start = dir_get_parent(thread_current()->curr_dir);
else
start = dir_open_root();
}
else
{
printf("here\n");
if(thread_current()->curr_dir)
{
// printf("also here\n");
start = dir_reopen(thread_current()->curr_dir);
}
else
{
// printf("when create a/b\n");
start = dir_open_root();
}
}*/
// printf("first setting\n");
// real = strtok_r(token,"/",&save);
// printf("token %s s %s\n",token,s);
if(token)
{
next_token = strtok_r(NULL,"/",&save_ptr);
/* if(next_token == NULL)
printf("AAAA\n");
else
printf("%s\n",next_token);*/
// printf("first %s second %s\n",token,next_token);
}
while( next_token!=NULL)
{
// printf("but not here\n");
if( strcmp(token,"." )==0)
{
continue;
}
else if( strcmp(token,"..") == 0)
{
if(inode_get_inumber(dir_get_inode(start))!=1)
{
start=dir_get_parent(start);
}
}
else
{
if(dir_lookup(start ,token, &inode))
{
// printf("when create a/b token:%s\n",token);
// printf("aaaa\n");
dir_close(start);
start = dir_open(inode);
}
else
return NULL;
// dir_close(start);
/* if( inode==NULL )
{
return NULL;
}
else if(inode_is_removed(inode))
return NULL;*/
// start = dir_open(inode);
}
prev_token = token;
token = next_token;
next_token = strtok_r(NULL,"/",&save_ptr);
// printf("first %s second %s\n",token,next_token);
}
// printf("directory name : %s \n",token);
return start;
}
