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Final.cpp
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Final.cpp
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/*
Virtual Machine
Completed on 09-04-2019
Authors:
Hariharan S V 18PT11
Krishnan S G 18PT19
*/
#include <iostream>
#include <conio.h>
#include <string.h>
#include<string>
#include <stdio.h>
#include <stdlib.h> // system()
#define SIZE 50
using namespace std;
char path[100];
struct Node
{
char directory_name[10];
char address[10];
Node *links[5];
Node *parent;
};
Node *home = new Node; //The Root Directory
Node *cur = new Node; //The Current Directory
class Queue
{
public:
int front, rear;
int size;
Node**array;
};
/*
Queue is created for holding nodes while copying a node into another
*/
Queue* Createqueue(int size)
{
Queue* queue = new Queue();
queue->front = queue->rear = -1;
queue->size = size;
queue->array = new Node*[queue->size * sizeof( Node* )];
int i;
for (i = 0; i < size; ++i)
queue->array[i] = NULL;
return queue;
}
int isempty(Queue* queue)
{
return queue->front == -1;
}
int isfull(Queue* queue)
{ return queue->rear == queue->size - 1; }
int Hasoneitem(Queue* queue)
{ return queue->front == queue->rear; }
void Enqueue(Node *root, Queue* queue)
{
if (isfull(queue))
return;
queue->array[++queue->rear] = root;
if (isempty(queue))
++queue->front;
}
Node* Dequeue(Queue* queue)
{
if (isempty(queue))
return NULL;
Node* temp = queue->array[queue->front];
if (Hasoneitem(queue))
queue->front = queue->rear = -1;
else
++queue->front;
return temp;
}
Node* getfront(Queue* queue)
{ return queue->array[queue->front]; }
/*
Queue which contains Nodes to be copied is Created and returned
*/
Queue* Levelorder(Node* root)
{
Queue* queue = Createqueue(SIZE);
Queue* queue1=Createqueue(SIZE);
Enqueue(root, queue);
Enqueue(root,queue1);
while (!isempty(queue))
{
Node* temp = Dequeue(queue);
for(int l=0;l<5;l++)
{
if(temp->links[l]!=NULL)
{
Enqueue(temp->links[l],queue);
Enqueue(temp->links[l],queue1);
}
}
}
return queue1;
}
/*
Creates the root home folder
*/
void create_home()
{
strcpy(home->directory_name, "home");
for (int i = 0; i < 5; i++)
{
home->links[i] = NULL;
}
strcpy(home->address,"");
home->parent = NULL;
}
/*
Creates the tree from the file
*/
void memory()
{
FILE *fp;
fp = fopen(path,"a+");
char addr[10],name[10];
while(fscanf(fp,"%s %s",&addr,&name)!=EOF)
{
int i,j=0;
i=strlen(addr);
Node *trav = home;
Node *temp = new Node;
strcpy(temp->directory_name,name);
strcpy(temp->address,addr);
for (int k = 0; k < 5; k++)
{
temp->links[k] = NULL;
}
for(j=0;j<i-1;j++)
{
trav = trav->links[int(addr[j])-48];
}
temp->parent=trav;
trav->links[int(addr[j])-48]=temp;
}
fclose(fp);
}
/*
Creates a new tree node
*/
Node *create(char name[10], Node *root)
{
Node *dir = new Node;
strcpy(dir->directory_name, name);
strcpy(dir->address,root->address);
for (int i = 0; i < 5; i++)
{
dir->links[i] = NULL;
}
dir->parent = root;
return dir;
}
void traverse(Node *root)
{
if (root)
{
cout << root->directory_name << " ";
for (int i = 0; i < 5; i++)
traverse(root->links[i]);
}
}
/*
Searches for the appropriate directory / file and initializes the address
*/
void find_and_print(char str[20])
{
int f=0,k=0;
char addr[10],name[20];
strcpy(addr,"");
for(int i=0;i<strlen(str);i++)
{
if(str[i]=='_')
{
f=1;
i++;
}
if(f==0)
{
addr[i]=str[i];
addr[i+1]='\0';
}
else if(f==1)
{
name[k]=str[i];
k++;
name[k]='\0';
}
}
if(strcmp(addr,cur->address)==0)
cout<<name<<endl;
}
/*
Function to create a new directory
*/
void mkdir(char name[10], int addr)
{
char temp[2];
temp[0]=char(addr+48);
temp[1]='\0';
cur->links[addr] = create(name, cur);
strcat(cur->links[addr]->address,temp);
FILE *fp;
fp = fopen(path,"a");
fprintf(fp,"%s %s\n",&cur->links[addr]->address,&cur->links[addr]->directory_name);
fclose(fp);
}
/*
Finds the current directory
*/
void find_current_user_dir()
{
system("cd > w_dir.txt");
FILE *fp;
fp = fopen("w_dir.txt","r");
fscanf(fp,"%s",&path);
strcat(path,"\\Virtual_Machine\\Database.txt");
}
/*
Function used in visualizing tree
*/
void spacing(Node *root,int a)
{
if(a)
{
for(int i=0;i<a-1;i++)
{
cout<<char(179)<<" ";
}
Node *temp = root->parent;
for(int m=0;m<5;m++)
{
if(temp->links[m]==root&&m!=4)
{
if(temp->links[m+1]!=NULL)
{
cout<<char(195)<<char(196)<<char(196)<<char(196);
break;
}
else
{
cout<<char(192)<<char(196)<<char(196)<<char(196);
break;
}
}
else if(m==4)
{
cout<<char(192)<<char(196)<<char(196)<<char(196);
break;
}
}
}
}
/*
Prints the tree
*/
void print_tree(Node *root)
{
if(root!=NULL)
{
if(root!=cur)
spacing(root,strlen(root->address)-strlen(cur->address));
cout<<root->directory_name<<"\n";
print_tree(root->links[0]);
print_tree(root->links[1]);
print_tree(root->links[2]);
print_tree(root->links[3]);
print_tree(root->links[4]);
}
}
/*
Deletes the directory to be deleted and it's contents
*/
void delete_tree(Node *root)
{
if(root!=NULL)
{
delete_tree(root->links[0]);
delete_tree(root->links[1]);
delete_tree(root->links[2]);
delete_tree(root->links[3]);
delete_tree(root->links[4]);
FILE *fp;
fp=fopen("Virtual_Machine\\Database.txt","a+");
FILE *fptr;
fptr=fopen("Temp.txt","w+");
char addr[20];
char dir[20];
while(fscanf(fp,"%s%s",addr,dir)!=EOF)
{
if(!(strcmp(root->address,addr)==0))
fprintf(fptr,"%s %s\n",addr,dir);
else if(strcmp(root->address,addr)==0)
{
char filename[20];
FILE *filepoint;
filepoint=fopen("Virtual_Machine\\Files.txt","a+");
FILE *filepointer;
filepointer=fopen("Tempfile.txt","w+");
while(fscanf(filepoint,"%s",filename)!=EOF)
{
char addrstr[10];
int i1;
for (i1=0;;i1++)
{
if(filename[i1]=='_')
break;
addrstr[i1]=filename[i1];
}
addrstr[i1]='\0';
if(!strcmp(addr,addrstr)==0)
fprintf(filepointer,"%s\n",filename);
else
{
char mycommand[100]="";
char path1[100]="";
strcat(mycommand,"del ");
FILE *fp2;
fp2= fopen("w_dir.txt","r");
fscanf(fp2,"%s",&path1);
fclose(fp2);
strcat(mycommand,path1);
strcat(mycommand,"\\Virtual_Machine\\");
strcat(mycommand,filename);
system(mycommand);
}
}
fclose(filepoint);
fclose(filepointer);
remove("Virtual_Machine\\Files.txt");
rename("Tempfile.txt","Virtual_Machine\\Files.txt");
}
}
fclose(fp);
fclose(fptr);
remove("Virtual_Machine\\Database.txt");
rename("Temp.txt","Virtual_Machine\\Database.txt");
delete(root);
}
}
/*
Function used for moving a directory and it's contents
*/
void change_address(Node *root,char addr[10],int slot)
{
char mypath[30]="";
FILE *fp2;
fp2= fopen("w_dir.txt","r");
fscanf(fp2,"%s",&mypath);
fclose(fp2);
if(root!=NULL)
{
char temp[10];
char slot_change[2];
slot_change[0]=char(slot+48);
slot_change[1]='\0';
strcpy(temp,addr);
strcat(temp,slot_change);
char adr[10],dir[30];
FILE *fp,*fptr,*filepoint,*filepointer;
fp=fopen("Virtual_Machine\\Database.txt","a+");
fptr=fopen("Temp.txt","w+");
while(fscanf(fp,"%s%s",adr,dir)!=EOF)
{
if(strcmp(adr,root->address)==0)
{
char filename[20];
filepoint=fopen("Virtual_Machine\\Files.txt","a+");
filepointer=fopen("Tempfile.txt","w+");
while(fscanf(filepoint,"%s",filename)!=EOF)
{
char addrstr[20];
char tempfilename[20];
int i1=0;
for (i1=0;;i1++)
{
if(filename[i1]!='_')
addrstr[i1]=filename[i1];
else
break;
}
addrstr[i1]='\0';
for(int i=0,j=i1+1;j<=strlen(filename);i++,j++)
{
if(j==strlen(filename))
tempfilename[i]='\0';
else{
tempfilename[i]=filename[j];
}
}
if(!strcmp(adr,addrstr)==0)
fprintf(filepointer,"%s\n",filename);
else
{
char command[100]="";
strcat(command,"rename ");
strcat(command,mypath);
strcat(command,"\\Virtual_Machine\\");
strcat(command,filename);
strcat(command," ");
strcat(command,temp);
strcat(command,"_");
strcat(command,tempfilename);
system(command);
fprintf(filepointer,"%s_%s\n",temp,tempfilename);
}
}
fclose(filepoint);
fclose(filepointer);
remove("Virtual_Machine\\Files.txt");
rename("Tempfile.txt","Virtual_Machine\\Files.txt");
strcpy(adr,temp);
}
fprintf(fptr,"%s %s\n",adr,dir);
}
fclose(fp);
fclose(fptr);
remove("Virtual_Machine\\Database.txt");
rename("Temp.txt","Virtual_Machine\\Database.txt");
//oldaddress
strcpy(root->address,temp);
//newaddress
for(int q=0;q<5;q++)
change_address(root->links[q],root->address,q);
}
}
/*
Function used for inserting the copied nodes into it's respective parent nodes
*/
void Find_parent(Node* d_dir,Node* Data)
{
int flag=0;
for(int i=0;i<5;i++)
{
if(d_dir->links[i]!=NULL && strcmp(d_dir->links[i]->directory_name,Data->parent->directory_name)==0)
{
Node* c_dir=d_dir->links[i];
for(int l=0;l<5;l++)
{
if(c_dir->links[l]!=NULL && strcmp(c_dir->links[l]->directory_name,Data->directory_name)==0)
{
cout<<"\nDirectory already exists\n";
return;
}
else if(c_dir->links[l]==NULL)
{
c_dir->links[l]=create(Data->directory_name,c_dir);
c_dir->links[l]->parent=d_dir->links[i];
char temp[10]="";
strcat(temp,c_dir->address);
char x[2];
x[0]=l+48;
x[1]='\0';
strcat(temp,x);
strcpy(c_dir->links[l]->address,temp);
char filename[20];
FILE *filepoint;
filepoint=fopen("Virtual_Machine\\Files.txt","a+");
FILE *filepointer;
filepointer=fopen("Tempfile.txt","w+");
while(fscanf(filepoint,"%s",filename)!=EOF)
{
char addrstr[20];
char tempfilename[20];
int i1=0;
for (i1=0;;i1++)
{
if(filename[i1]!='_')
addrstr[i1]=filename[i1];
else
break;
}
addrstr[i1]='\0';
for(int i=0,j=i1+1;j<=strlen(filename);i++,j++)
{
if(j==strlen(filename))
tempfilename[i]='\0';
else{
tempfilename[i]=filename[j];
}
}
//cout<<endl<<"Now Check address "<<adr<<" "<<addrstr<<endl<<tempfilename<<" "<<temp<<"_"<<tempfilename<<endl;
if(!strcmp(Data->address,addrstr)==0)
fprintf(filepointer,"%s\n",filename);
else if(strcmp(Data->address,addrstr)==0)
{
char path1[30]="";
char mynewcommand[100]="";
FILE *fp2;
fp2= fopen("w_dir.txt","r");
fscanf(fp2,"%s",&path1);
fclose(fp2);
strcat(mynewcommand,"copy ");
strcat(mynewcommand,path1);
strcat(mynewcommand,"\\Virtual_Machine\\");
strcat(mynewcommand,filename);
strcat(mynewcommand," ");
strcat(mynewcommand,path1);
strcat(mynewcommand,"\\Virtual_Machine\\");
strcat(mynewcommand,temp);
strcat(mynewcommand,"_");
strcat(mynewcommand,tempfilename);
system(mynewcommand);
fprintf(filepointer,"%s\n",filename);
fprintf(filepointer,"%s_%s\n",temp,tempfilename);
}
}
fclose(filepoint);
fclose(filepointer);
remove("Virtual_Machine\\Files.txt");
rename("Tempfile.txt","Virtual_Machine\\Files.txt");
FILE *fp;
fp=fopen("Virtual_Machine\\Database.txt","a+");
fprintf(fp,"%s %s\n",c_dir->links[l]->address,c_dir->links[l]->directory_name);
fclose(fp);
flag=1;
cout<<"\nCopied successfully\n";
break;
}
}
if(flag==1)
return;
}
else if(d_dir->links[i]!=NULL && strcmp(d_dir->links[i]->directory_name,Data->parent->directory_name)!=0)
{
flag=0;
Find_parent(d_dir->links[i],Data);
}
}
}
/*
Queue containing the nodes to be copied and destination are sent to find_parent
*/
void copyfiles(Queue *queue,Node *d_dir)
{
Node* Data=Dequeue(queue);
char tempdata[20];
strcpy(tempdata,Data->parent->directory_name);
strcpy(Data->parent->directory_name,d_dir->directory_name);
Find_parent(d_dir->parent,Data);
strcpy(Data->parent->directory_name,tempdata);
while(!isempty(queue))
{
Node* Data=Dequeue(queue);
Find_parent(d_dir,Data);
}
}
void help()
{
cout<<"\nCommands are\nmkdir - creates a new directory\n\tmkdir new_directory_name\n";
cout<<"\nrmdir - remove a directory and it's contents recursively\n\trmdir directory_name\n";
cout<<"\nls - lists all the files and directories in the current directory\n";
cout<<"\ntree - displays all directories recursively under current directory\n";
cout<<"\nmove - moves the source directory into the destination directory\n\tmove -d source path\n\tmove -f filename path (to move files)\n";
cout<<"\ncopy - copies the source directory into the destination directory\n\tcopy -d source path\n\tcopy -f filename path (to copy files)\n";
cout<<"\nsearch - searches for the directory in current directory\n\tsearch directory_name\n";
cout<<"\nrename - renames a directory/file in current directory\n\trename -d oldname newname\n\trename -f oldname newname(for files)";
cout<<endl;
}
int main()
{
find_current_user_dir();
create_home();
cur = home;
memory();
system("mkdir Virtual_Machine");
system("cls");
char current_dir[100] = {""};
int len = strlen(current_dir);
char command[50];
int i = 0;
do
{
Node *trav;
trav=cur;
strcpy(current_dir,"");
do
{
char rev[10];
strcpy(rev,cur->directory_name);
strcat(current_dir,"/");
strcat(current_dir,strrev(rev));
cur = cur->parent;
}while(cur!=NULL);
cur=trav;
cout<< strrev(current_dir) << "\b > ";
cin >> command;
if (strcmp(command, "mkdir") == 0)
{
char name[10];
cin >> name;
int free_slot=-1;
for(int l=0;l<5;l++)
{
if(cur->links[l]!=NULL&&strcmp(cur->links[l]->directory_name,name)==0)
{
cout<< "Directory named \'"<<name<<"\' already exists. Did you mean cd \'"<<name<<"\' ?"<<endl;
free_slot=-2;
break;
}
if(cur->links[l]==NULL)
{
free_slot=l;
break;
}
}
if(free_slot>=0)
{
mkdir(name, free_slot);
}
else if(free_slot==-1)
{
cout<< "Directory \'"<<cur->directory_name<<"\' is full\n";
}
i++;
}
else if (strcmp(command, "rmdir") == 0)
{
char name[20];
cin>>name;
int flag=0;
for(int l=0;l<5;l++)
{
if(cur->links[l]!=NULL&&strcmp(cur->links[l]->directory_name,name)==0)
{
flag=1;
cout << "\nDeleted\n";
delete_tree(cur->links[l]);
cur->links[l]=NULL;
break;
}
}
if(flag==0)
cout<<"Directory not found in "<<current_dir<<endl;
}
else if(strcmp(command,"delete")==0)
{
int flag=0;
char oldfilename[30];
char filename[30];
char tempfilename[30]="";
cin>>oldfilename;
strcat(tempfilename,cur->address);
strcat(tempfilename,"_");
strcat(tempfilename,oldfilename);
FILE *filepoint;
filepoint=fopen("Virtual_Machine\\Files.txt","a+");
FILE *filepointer;
filepointer=fopen("Tempfile.txt","w+");
while(fscanf(filepoint,"%s",filename)!=EOF)
{
if(strcmp(filename,tempfilename)!=0)
fprintf(filepointer,"%s\n",filename);
else
{
char mycommand[100]="";
char path1[100]="";
strcat(mycommand,"del ");
FILE *fp2;
fp2= fopen("w_dir.txt","r");
fscanf(fp2,"%s",&path1);
fclose(fp2);
strcat(mycommand,path1);
strcat(mycommand,"\\Virtual_Machine\\");
strcat(mycommand,filename);
system(mycommand);
flag=1;
}
}
fclose(filepoint);
fclose(filepointer);
remove("Virtual_Machine\\Files.txt");
rename("Tempfile.txt","Virtual_Machine\\Files.txt");
if(flag==1)
cout<<"Successfully deleted\n";
else
{
cout<<"Could not delete file\n";
}
}
else if (strcmp(command, "move") == 0)
{
char specifier[10]="",source[50],destination[50];
Node *d_dir=home;
cin>>specifier>>source>>destination;;
int linked_at=-1;
if(strcmp(specifier,"-d")==0)
{
for(int v=0;v<5;v++)
{
if(cur->links[v]!=NULL&&strcmp(source,cur->links[v]->directory_name)==0)
{
linked_at=v;
break;
}
}
if(linked_at>=0)
{
char folder_name[20];
int l=0;
bool path_valid=true;
for(int m=0;m<strlen(destination)&&path_valid;m++)
{
if(destination[m]=='/')
{
path_valid=false;
for(int s=0;s<5;s++)
{
if(d_dir->links[s]!=NULL&&strcmp(folder_name,d_dir->links[s]->directory_name)==0)
{
d_dir=d_dir->links[s];
path_valid=true;
break;
}
}
if(path_valid==false)
cout<<"Invalid path"<<endl;
l=0;
strcpy(folder_name,"");
}
else
{
folder_name[l]=destination[m];
l++;
folder_name[l]='\0';
}
}
if(path_valid)
{
bool move_success=true;
int store=-1;
for(int d=0;d<5;d++)
{
if(d_dir->links[d]==NULL)
{
if(store==-1)
store=d;
}
if(d_dir->links[d]!=NULL&&strcmp(d_dir->links[d]->directory_name,source)==0)
{
cout<<"Directory exist in destination folder";
move_success=false;
break;
}
}
if(store>=0&&move_success)
{
d_dir->links[store]=cur->links[linked_at];
d_dir->links[store]->parent=d_dir;
change_address(d_dir->links[store],d_dir->address,store);
cur->links[linked_at]=NULL;
cout<<"\nMoved Successfully\n";
}
else if (store<0&&move_success)
{
cout<<"Destination Directory Full"<<endl;
}
}
}
else
{
cout<<"No Directory named \'"<<source<<" \' in "<<current_dir<<endl;
}
}
else if(strcmp(specifier,"-f")==0)
{
char folder_name[20];
char mynewcommand[30]="";
char path1[30]="";
int l=0;
bool path_valid=true;
for(int m=0;m<strlen(destination)&&path_valid;m++)
{
if(destination[m]=='/')
{
path_valid=false;
for(int s=0;s<5;s++)
{
if(d_dir->links[s]!=NULL&&strcmp(folder_name,d_dir->links[s]->directory_name)==0)
{
d_dir=d_dir->links[s];
cout<<d_dir->address<<"\t";
path_valid=true;
break;
}
}
if(path_valid==false)
cout<<"Invalid path\n";
l=0;
strcpy(folder_name,"");
}
else
{
folder_name[l]=destination[m];
l++;
folder_name[l]='\0';
}
}
if(path_valid)
{
FILE *filepoint;
filepoint=fopen("Virtual_Machine\\Files.txt","a+");
FILE *filepointer;
filepointer=fopen("Tempfile.txt","w+");
char filename[20];
while(fscanf(filepoint,"%s",filename)!=EOF)
{
char tempfilename[20];
int i1;
for (i1=0;;i1++)
{
if(filename[i1]=='_')
break;
}
for(int i=0,j=i1+1;j<=strlen(filename);i++,j++)
{
if(j==strlen(filename))
tempfilename[i]='\0';
else
tempfilename[i]=filename[j];
}
if(!strcmp(source,tempfilename)==0)
fprintf(filepointer,"%s\n",filename);
else
{
strcat(mynewcommand,"rename ");
FILE *fp2;
fp2= fopen("w_dir.txt","r");
fscanf(fp2,"%s",&path1);
fclose(fp2);
strcat(mynewcommand,path1);
strcat(mynewcommand,"\\Virtual_Machine\\");
strcat(mynewcommand,filename);
strcat(mynewcommand," ");
strcat(mynewcommand,d_dir->address);
strcat(mynewcommand,"_");
strcat(mynewcommand,tempfilename);
system(mynewcommand);
fprintf(filepointer,"%s_%s\n",d_dir->address,tempfilename);
}
}
fclose(filepoint);
fclose(filepointer);
remove("Virtual_Machine\\Files.txt");
rename("Tempfile.txt","Virtual_Machine\\Files.txt");
cout<<"\nFile moved successfully\n";
}
else
cout<<"Invalid Path";
}
else
cout<<"Did you mean \"move -f/-d source destination\"?";
cout<<endl;
}
else if (strcmp(command, "cd") == 0)
{
char name[10];
cin >> name;
if (strcmp(name, "..") == 0)
{
if (cur != home)
{
cur = cur->parent;
}
}
else
{
int cd_at=-1;
for(int s=0;s<5;s++)
{
if(cur->links[s]!=NULL && strcmp(cur->links[s]->directory_name,name)==0)
{
cd_at=s;
break;
}
}
if(cd_at!=-1)
cur = cur->links[cd_at];
else
{
cout<<"\'"<<name<<"\' not found\n";
}
}
}
else if(strcmp(command,"copy")==0)
{
int flag=0;
char specifier[10],source[30],destination[50];
char folder_name[50];
Queue *queue=Createqueue(SIZE);
bool path_valid=true;
cin>>specifier>>source>>destination;
Node* d_dir=home;
if(strcmp(specifier,"-d")==0)
{
for(int l=0;l<5;l++)
{
if(cur->links[l]!=NULL&&strcmp(cur->links[l]->directory_name,source)==0)
{
flag=1;
queue=Levelorder(cur->links[l]);
break;
}
}
if(flag==0)
{
cout<<"Source directory not found"<<endl;
}
else
{
int l=0;
for(int m=0;m<strlen(destination)&&path_valid;m++)
{
if(destination[m]=='/')
{
path_valid=false;
for(int s=0;s<5;s++)
{
if(d_dir->links[s]!=NULL)
{
if(strcmp(folder_name,d_dir->links[s]->directory_name)==0)
{
d_dir=d_dir->links[s];
path_valid=true;
break;
}
}
}
if(path_valid==false)
{
cout<<"Invalid path\n";
break;
}
l=0;
strcpy(folder_name,"");
}
else
{
folder_name[l]=destination[m];
l++;
folder_name[l]='\0';
}
}
if(path_valid && d_dir->parent!=NULL)
{