/*
* NAME: vol->catsearch()
* DESCRIPTION: search catalog tree
*/
int v_catsearch(hfsvol *vol, long parid, const char *name,
CatDataRec *data, char *cname, node *np)
{
CatKeyRec key;
byte pkey[HFS_CATKEYLEN];
const byte *ptr;
node n;
int found;
if (np == 0)
np = &n;
r_makecatkey(&key, parid, name);
r_packcatkey(&key, pkey, 0);
found = bt_search(&vol->cat, pkey, np);
if (found <= 0)
return found;
ptr = HFS_NODEREC(*np, np->rnum);
if (cname)
{
r_unpackcatkey(ptr, &key);
strcpy(cname, key.ckrCName);
}
if (data)
r_unpackcatdata(HFS_RECDATA(ptr), data);
return 1;
}
int main (int argc, char *argv[]) {
struct node *tree = NULL;
struct node *lookup;
struct in_addr ip;
int idx;
int random;
char text[64];
printf ("Binary tree test\n");
for (idx = 0; idx < 10; idx++) {
sprintf (text, "chiave %d", rand() % 16);
bt_insert (&tree, text, &ip, idx);
}
printf ("Printing\n");
print_tree (tree);
for (idx = 0; idx < 16; idx++) {
sprintf (text, "chiave %d", idx);
lookup = bt_search (tree, text);
if (lookup == NULL)
printf ("%s not found\n", text);
else
printf ("%s has been found with idx %d\n", lookup->key, lookup->expires);
}
bt_delete_tree (tree);
printf ("Done\n");
}
/*
* NAME: hfs->opendir()
* DESCRIPTION: prepare to read the contents of a directory
*/
hfsdir *hfs_opendir(hfsvol *vol, const char *path)
{
hfsdir *dir = 0;
CatKeyRec key;
CatDataRec data;
byte pkey[HFS_CATKEYLEN];
if (getvol(&vol) == -1)
goto fail;
dir = ALLOC(hfsdir, 1);
if (dir == 0)
ERROR(ENOMEM, 0);
dir->vol = vol;
if (*path == 0)
{
#ifdef CP_NO_STATIC
/* meta-directory containing root dirs from all mounted volumes */
dir->dirid = 0;
dir->vptr = hfs_mounts;
#else
assert(0);
#endif
}
else
{
if (v_resolve(&vol, path, &data, 0, 0, 0) <= 0)
goto fail;
if (data.cdrType != cdrDirRec)
ERROR(ENOTDIR, 0);
dir->dirid = data.u.dir.dirDirID;
dir->vptr = 0;
r_makecatkey(&key, dir->dirid, "");
r_packcatkey(&key, pkey, 0);
if (bt_search(&vol->cat, pkey, &dir->n) <= 0)
goto fail;
}
dir->prev = 0;
dir->next = vol->dirs;
if (vol->dirs)
vol->dirs->prev = dir;
vol->dirs = dir;
return dir;
fail:
FREE(dir);
return 0;
}
//Search in the binary tree
node* bt_search(char *query, node *root){
if (root == NULL){
printf("\nStudent Record not found\n\n");
return NULL;
}
if (strcmp(root->data->identity, query) == 0){
return root;
}
else{
if ( strcmp(query, root->data->identity) == -1 ){
bt_search(query, root->left);
}
else{
bt_search(query, root->right);
}
}
}
BTree* bt_search(BTree* a, int x, int* pos) {
int found = findpos(a,x,pos);
if (found)
return a;
else if (isleaf(a))
return NULL;
else
return bt_search(a->p[*pos], x, pos);
}
//Element deletion
void delete_element(char *query, node *root){
if (root == NULL){
printf("Empty Tree\n");
return;
}
node* del = bt_search(query, root);
node* tmp;
if (del == NULL) return;
//The node has two children
if (del->left!=NULL && del->right!=NULL){
tmp = findMax(del->left);
overwrite(del, tmp);
//Checking if the current node is the left or right parent's child
if (tmp->parent->left == tmp) tmp->parent->left=NULL;
else tmp->parent->right = NULL;
free(tmp->data);
free(tmp);
}
//The node has not any childFILE* fo = fopen( "treedata.txt", "a+" );
else if (del->left==NULL && del->right==NULL){
//Checking if the current node is the left or right parent's child
if (del->parent->left == del) del->parent->left=NULL;
else del->parent->right = NULL;
free(del->data);
free(del);
}
//The node has one child
else{
if (del->left == NULL){
tmp = del->right;
del->right = NULL;
}
else if (del->right == NULL){
tmp = del->left;
del->left = NULL;
}
overwrite(del, tmp);
del->left = tmp->left;
del->right = tmp->right;
free(tmp->data);
free(tmp);
}
}
/*
* NAME: vol->extsearch()
* DESCRIPTION: search extents tree
*/
int v_extsearch(hfsfile *file, unsigned int fabn,
ExtDataRec *data, node *np)
{
ExtKeyRec key;
ExtDataRec extsave;
unsigned int fabnsave;
byte pkey[HFS_EXTKEYLEN];
const byte *ptr;
node n;
int found;
if (np == 0)
np = &n;
r_makeextkey(&key, file->fork, file->cat.u.fil.filFlNum, fabn);
r_packextkey(&key, pkey, 0);
/* in case bt_search() clobbers these */
memcpy(&extsave, &file->ext, sizeof(ExtDataRec));
fabnsave = file->fabn;
found = bt_search(&file->vol->ext, pkey, np);
memcpy(&file->ext, &extsave, sizeof(ExtDataRec));
file->fabn = fabnsave;
if (found <= 0)
return found;
if (data)
{
ptr = HFS_NODEREC(*np, np->rnum);
r_unpackextdata(HFS_RECDATA(ptr), data);
}
return 1;
}
int identity(){
binary_tree *tree = init_bt();
read_db_to_tree(tree);
node* tmp;
char buffer[50];
float fbuff;
int cmd;
FILE *f;
while(1){
printf("########################\n");
printf("# 1. Print In-Order #\n");
printf("# 2. Search #\n");
printf("# 3. Modify #\n");
printf("# 4. Delete #\n");
printf("# 5. Exit #\n");
printf("########################\n");
printf("Enter your choice: ");
scanf("%d",&cmd);
switch (cmd){
case 1:
inorder(tree->root);
break;
case 2:
printf("Enter IDENTITY NUMBER: ");
scanf("%s",&buffer);
tmp = bt_search(buffer, tree->root);
if (tmp != NULL) {
printf("\nResult: ");
print_node(tmp);
printf("\n");
}
break;
case 3:
printf("Enter IDENTITY: ");
scanf("%s", &buffer);
tmp = bt_search(buffer, tree->root);
if (tmp != NULL){
printf("Enter Name: ");
scanf("%s",&buffer);
strcpy(tmp->data->name, buffer);
printf("Enter Sirname: ");
scanf("%s",&buffer);
strcpy(tmp->data->sirname, buffer);
printf("Enter Average Grade: ");
scanf("%f",&fbuff);
tmp->data->avg_grade = fbuff;
printf("\n\n");
print_node(tmp);
}
fflush(stdin);
break;
case 4:
printf("Enter IDENTITY: ");
scanf("%s",&buffer);
delete_element(buffer, tree->root);
break;
case 5:
// Clear the previous database file
f = fopen("student_database.txt", "w");
fclose(f);
print_preorder(tree->root);
return 0;
default:
printf("Bad Command\n");
break;
}
}
}
/*
* NAME: hfs->opendir()
* DESCRIPTION: prepare to read the contents of a directory
*/
hfsdir *hfs_opendir(hfsvol *vol, char *path)
{
hfsdir *dir;
CatKeyRec key;
CatDataRec data;
unsigned char pkey[HFS_CATKEYLEN];
if (v_getvol(&vol) < 0)
return 0;
dir = ALLOC(hfsdir, 1);
if (dir == 0)
{
ERROR(ENOMEM, 0);
return 0;
}
dir->vol = vol;
if (*path == 0)
{
/* meta-directory containing root dirs from all mounted volumes */
dir->dirid = 0;
dir->vptr = hfs_mounts;
}
else
{
if (v_resolve(&vol, path, &data, 0, 0, 0) <= 0)
{
FREE(dir);
return 0;
}
if (data.cdrType != cdrDirRec)
{
FREE(dir);
ERROR(ENOTDIR, 0);
return 0;
}
dir->dirid = data.u.dir.dirDirID;
dir->vptr = 0;
r_makecatkey(&key, dir->dirid, (char *)"");
r_packcatkey(&key, pkey, 0);
if (bt_search(&vol->cat, pkey, &dir->n) <= 0)
{
FREE(dir);
return 0;
}
}
dir->prev = 0;
dir->next = vol->dirs;
if (vol->dirs)
vol->dirs->prev = dir;
vol->dirs = dir;
return dir;
}