/* --------------------------------------------------------
do_pwd:
* recursively follow a pathname back to a root
*
* base case: dir is a ROOT
* if not base case:
* (1) get_block and point DIR* dp to start
of second block, which is ..
* (2) use dp to get parent's ino
* (3) load parent MINODE using iget
* (4) Recusively call do_pwd(parent)
* (5) print / and directory name
-------------------------------------------------------------*/
void do_pwd(MINODE* dir)
{
MINODE* parent;
int pino, ino;
char* cp;
DIR* dp;
char buf[BLOCK_SIZE];
// (1) Base case: DIR is root
if(dir == root)
{
printf("/");
return;
}
// Read in i_block[0],
// which contains all of the directories contained in this DIR
get_block(dir->dev, dir->INODE.i_block[0], buf);
// Point to the beginning of the datablock
cp = buf;
dp = (DIR*) cp;
// Get ino number of current directory
ino = dp->inode;
// go to second data block, get ino of ..
cp += dp->rec_len;
dp = (DIR* )cp;
// dp now points to .., the parent's directory
pino = dp->inode; // get parent's ino
// Load the parent MINODE*
parent = iget(dir->dev, pino);
// Call pwd with parent's MINODE pointer
do_pwd(parent);
if(parent == NULL)
{
printf("Error: could not load MINODE %s", dp->name);
return;
}
// (3) Print name followed by /
// Search parent DIR for an entry with this ino
// Get the name associated with this ino
char* dirName = findmyname(parent, ino);
printf("%s/", dirName);
iput(parent);
}
char* find_name(MINODE *mip)
{
int my_ino = 0;
int parent_ino = 0;
findino(mip, &my_ino, &parent_ino);
MINODE* parent_mip = iget(running->cwd->device, parent_ino);
char* my_name = NULL;
findmyname(parent_mip, my_ino, &my_name);
iput(parent_mip);
return my_name;
}