CVFS.cpp

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<iostream>
#include<io.h>

#include "CVFS.h"

int main()
{
    char *ptr = NULL;
    int ret = 0,fd = 0,count = 0;
    char command[4][80],str[80],arr[1024];

    InitialiseSuperBlock();
    CreateDILB();

    while (1)
    {
        fflush(stdin);
        strcpy(str,"");

        printf("\nMarvellous Customized Virtual File System(CVFS):> ");
        fgets(str,80,stdin);//scanf("%[^\n]s,str");

        count = sscanf(str," %s %s %s",command[0],command[1],command[2],command[3]);

        if (count == 1)
        {
            if (strcmp(command[0],"ls") == 0)
            {
                ls_file();
            }
            else if (strcmp(command[0],"closeall") == 0)
            {
                CloseAllFile();
                printf("All files closed sucessfully\n");
                continue;
            }
            else if (strcmp(command[0],"clear") == 0)
            {
                system("cls");
                continue;
            }
            else if (strcmp(command[0],"help") == 0)
            {
                DisplayHelp();
                continue;
            }
            else if (strcmp(command[0],"exit") == 0)
            {
                printf("Terminating the Virtual File System\n");
                break;
            }
            else
            {
                printf("\nError: Command not found !!!\n");
                continue;
            }
        }
        else if (count == 2)
        {
            if (strcmp(command[0],"stat") == 0)
            {
                ret = stat_file(command[1]);
                if (ret == -1)
                {
                    printf("ERROR: Incorrect parameters\n");
                }
                if (ret == -2)
                {
                    printf("ERROR:There is no such file\n");
                }
                continue;
             }
                else if (strcmp(command[0],"fstat") == 0)
                {
                    ret = fstat_file(atoi(command[1]));
                    if (ret == -1)
                    {
                        printf("ERROR: Incorrect Parameters\n");
                    }
                    if (ret == -2)
                    {
                        printf("ERROR: There is no such file\n");
                    }
                    continue;
                }
                else if (strcmp(command[0],"close") == 0)
                {
                    ret = CloseFileByName(command[1]);
                    if (ret == -1)
                    {
                        printf("ERROR: There is no such file\n");
                    }
                    continue;
                }
                else if (strcmp(command[0],"rm") == 0)
                {
                    ret = rm_File(command[1]);
                    if (ret == -1)
                    {
                        printf("ERROR: There is no such file\n");
                    }
                    continue;
                }
                else if (strcmp(command[0],"man") == 0)
                {
                    man(command[1]);
                }
                else if (strcmp(command[0],"write") == 0)
                {
                    fd = GetFDFromName(command[1]);
                    if (fd == -1) 
                    {
                        printf("ERROR: Incorrect parameter\n");
                        continue;
                    }
                    printf("Enter the data: \n");
                    scanf("%[^\n]",arr);

                    ret = strlen(arr);
                    if (ret == 0)
                    {
                        printf("ERROR: Incorrect parameter\n");
                        continue;
                    }
                    
                    ret = WriteFile(fd,arr,ret);
                    if (ret == -1)
                    {
                        printf("ERROR: Permission denied\n");
                    }
                    if (ret == -2)
                    {
                        printf("ERROR: There is no sufficient memory to write\n");
                    }
                    if (ret == -3)
                    {
                        printf("ERROR: It is not regular file\n");
                    }
                }
                else if (strcmp(command[0],"truncate") == 0)
                {
                    ret = truncate_File(command[1]);
                    if (ret == -1)
                    {
                        printf("ERROR: Incorrect parameter\n");
                    }
                }
                else
                {
                    printf("\nERROR: Command not found !!!\n");
                    continue;
                }
            }
            else if (count == 3)
            {
                if (strcmp(command[0],"create") == 0)
                {
                    ret = CreateFile(command[1],atoi(command[2]));
                    if (ret >= 0)
                    {
                        printf("File is sucessfully created with file descriptor: %d\n",ret);
                    }
                    if (ret == -1)
                    {
                        printf("ERROR: Incorrect parameters\n");
                    }
                    if (ret == -2)
                    {
                        printf("ERROR: There are no inodes\n");
                    }
                    if (ret == -3)
                    {
                        printf("ERROR: File already exists\n");
                    }
                    
                    if (ret == -4)
                    {
                        printf("ERROR: Memory allocation failure\n");
                    }
                    continue;
                }
                else if (strcmp(command[0],"open") == 0)
                {
                    ret = OpenFile(command[1],atoi(command[2]));
                    if (ret >= 0)
                    {
                        printf("File is sucessfully opened with file descriptor: %d\n",ret);
                    }
                    if (ret == -1)
                    {
                        printf("ERROR: Incorrect parameters\n");
                    }
                    if (ret == -2)
                    {
                        printf("ERROR: File not present\n");
                    }
                    if (ret == -3)
                    {
                        printf("ERROR:permission denied\n");
                    }
                    continue;
                }
                else if (strcmp(command[0],"read") == 0)
                {
                    fd = GetFDFromName(command[1]);
                    if (fd == -1)
                    {
                        printf("ERROR: Incorrect parameter\n");
                        continue;
                    }
                    ptr = (char*)malloc(sizeof(atoi(command[2]))+1);
                    if (ptr == NULL)
                    {
                        printf("ERROR: Memory allocation failure\n");
                        continue;
                    }
                    ret = ReadFile(fd,ptr,atoi(command[2]));
                    if (ret == -1)
                    {
                        printf("ERROR: File not existing\n");
                    }
                    if (ret == -2)
                    {
                        printf("ERROR: Permission denied\n");
                    }
                    if (ret == -3)
                    {
                        printf("ERROR: Reached at end of file\n");
                    }
                    if (ret == -4)
                    {
                        printf("ERROR: It is not regular file \n");
                    }
                    if (ret == 0)
                    {
                        printf("ERROR: File empty\n");
                    }
                    if (ret>0)
                    {
                        write(2,ptr,ret);
                    }
                    continue;
                }
                else if (count == 4)
                {
                    if (strcmp(command[0],"lseek") == 0)
                    {
                        fd = GetFDFromName(command[1]);
                        if (fd == -1)
                        {
                            printf("ERROR: Incorrect parameter\n");
                            continue;
                        }
                        ret = LseekFile(fd,atoi(command[2]),atoi(command[3]));
                        if (ret == -1)
                        {
                            printf("ERROR: Unable to perform lseek\n");
                        }                        
                     }
                     else
                     {
                         printf("\nERROR: Command not found !!!\n");
                         continue;
                     }
                }
                else
                {
                    printf("\nERROR: Command not found !!!\n");
                    continue;
                }
            }
        }
        return 0;
}