filesys

#include<stdio.h>
#include<string.h>
void singled()
{
        int i;
        char f[20];
        struct
        {
                char dname[10],fname[10][10];
                int fcnt;
        }dir;
        int ch,flag=0;
        printf("Enter the name of the directory: ");
        scanf("%s",dir.dname);
        dir.fcnt=0;
        while(1)
        {
                printf("\n\tMENU\n\nEnter the operation to be performed:\n1)Create a file \n2)Delete a file\n3)Search a file\n4)Display all files\n5.Exit");
                scanf("%d",&ch);
                switch (ch)
                {
                        case 1:printf("\nEnter the name of the file :   ");
                                scanf("%s",f);
                                for(i=0;i<dir.fcnt;i++)
                                  {
                                          if(strcmp(f,dir.fname[i])==0)
                                          {
                                                 printf("\nThe file already exists");
                                                 flag=1;
                                                 break;
                                          }
                                  }
                                if(flag!=1)
                                {
                                        strcpy(dir.fname[dir.fcnt],f);
                                        dir.fcnt++;
                                }
                                break;
                        case 2:printf("\nEnter the name of the file to be deleted:");
                                scanf("%s",f);
                                for(i=0;i<dir.fcnt;i++)
                                {
                                        if(strcmp(f,dir.fname[i])==0)
                                        {
                                                printf("\nThe file has been deleted");
                                                strcpy(dir.fname[i],dir.fname[dir.fcnt-1]);
                                                break;
                                        }
                                }
                                if(i==dir.fcnt)
                                {
                                        printf("\nFile was not found");
                                }
                                else
                                        dir.fcnt--;
                                break;
                        case 3:printf("\nEnter the name of the file to be searched for: ");
                                scanf("%s",f);
                                for(i=0;i<dir.fcnt;i++)
                                {
                                         if(strcmp(f,dir.fname[i])==0)
                                         {
                                                  printf("\nThe file has been found!");
                                                  flag=1;
                                                  break;
                                         }
                                }
                                if(flag!=1)
                                        printf("\nFile was not found in the directory");
                                break;
                        case 4:printf("\nDisplaying the file names: \n");
                                if(dir.fcnt==0)
                                {
                                        printf("\nNo files in directory");
                                        break;
                                }
                                for(i=0;i<dir.fcnt;i++)
                                        printf("%s\n",dir.fname[i]);
                                break;
                        case 5:exit(0);
                }
        }

}

void twod()
{
  
  struct
{
  char dname[10],fname[10][10];
  int fcnt;
}dir[10];

int i,ch,dcnt,k;
char f[30], d[30];
dcnt=0;
while(1)
{
  printf("\n\n 1. Create Directory\t 2. Create File\t 3. Delete File");
  printf("\n 4. Search File \t \t 5. Display \t 6. Exit \t Enter your choice -- ");
  scanf("%d",&ch);
    switch(ch)
  {
  case 1: printf("\n Enter name of directory -- ");
  scanf("%s", dir[dcnt].dname);
  dir[dcnt].fcnt=0;
  dcnt++;
  printf("Directory created");
  break;
  case 2: printf("\n Enter name of the directory -- ");
  scanf("%s",d);
  for(i=0;i<dcnt;i++)
  if(strcmp(d,dir[i].dname)==0)
  {
    printf("Enter name of the file -- ");
    scanf("%s",dir[i].fname[dir[i].fcnt]);
    dir[i].fcnt++;
    printf("File created");
    break;
  }
  if(i==dcnt)
  printf("Directory %s not found",d);
  break;
  case 3: printf("\nEnter name of the directory -- ");
  scanf("%s",d);
  for(i=0;i<dcnt;i++)
  {
    if(strcmp(d,dir[i].dname)==0)
    {
      printf("Enter name of the file -- ");
      scanf("%s",f);
      for(k=0;k<dir[i].fcnt;k++)
        {
          if(strcmp(f, dir[i].fname[k])==0)
            {
              printf("File %s is deleted ",f);
              dir[i].fcnt--;
              strcpy(dir[i].fname[k],dir[i].fname[dir[i].fcnt]);
              goto jmp;
            }
        }
      printf("File %s not found",f);
      goto jmp;
    }
  }
printf("Directory %s not found",d);
jmp : break;
case 4: printf("\nEnter name of the directory -- ");
scanf("%s",d);
for(i=0;i<dcnt;i++)
{

if(strcmp(d,dir[i].dname)==0)
{
printf("Enter the name of the file -- ");
scanf("%s",f);
for(k=0;k<dir[i].fcnt;k++)
{
if(strcmp(f, dir[i].fname[k])==0)
{
printf("File %s is found ",f);
goto jmp1;
}
}
printf("File %s not found",f);
goto jmp1;
}
}
printf("Directory %s not found",d);
jmp1: break;
case 5: if(dcnt==0)
printf("\nNo Directory's ");
else
{
printf("\nDirectory\tFiles");
for(i=0;i<dcnt;i++)
{
printf("\n%s\t\t",dir[i].dname);
for(k=0;k<dir[i].fcnt;k++)
printf("\t%s",dir[i].fname[k]);
}
}
break;
default:exit(0);
}
}
}

void hierarchical()
{
  struct
  {
    char name[30];
    char type;
    int flag;
  }sys[30];
  
  int i,c,flag2=0;
  char ch,chname[10];
  for(i=0;i<30;i++)
    sys[i].flag=0;
    
  //INITIAL CREATION
  sys[1].flag=sys[2].flag=sys[3].flag=1;
  sys[1].type=sys[2].type=sys[3].type='d';
  strcpy(sys[1].name,"root");
  printf("Enter the name of the two user directories: ");
  scanf("%s %s",sys[2].name,sys[3].name);
  while(1)
  {
  printf("\nMENU\n1)Create directory/file\n2)Delete file\n3)Search directory/file\n4)Display directory\n");
  scanf("%d",&c);
  switch (c)
  {
    case 1://CREATION
            printf("Directory or File?(d/f)");
            scanf("%c",&ch);
            scanf("%c",&ch);
            printf("Enter the name of the directory to enter in:");
            scanf("%s",chname);
            for(i=1;i<30;i++)
            { 
              if(strcmp(chname,sys[i].name)==0)
              {
                if(sys[2*i].flag==1 && sys[(2*i)+1].flag==1)
                  {
                    printf("Insertion not possible in specified directory. Aborting.");
                    break;
                  }
                else if(sys[2*i].flag==0)
                {
                  flag2=1;
                  sys[2*i].type=ch;
                  sys[2*i].flag=1;
                  printf("\Enter the name:");
                  scanf("%s",sys[2*i].name);
        
                }
                else
                {
                flag2=1;
                sys[(2*i)+1].type=ch;
                sys[(2*i)+1].flag=1;
                printf("\Enter the name:");
                scanf("%s",sys[(2*i)+1].name);
                }
              }
            }
  if(flag2==0)
  {
    printf("Insertion failed. No such directory");
  }
  flag2=0;
  break;
  
  case 2:  //DELETE File
          printf("Enter the name of the file to be deleted:");
          scanf("%s",chname);
          for(i=0;i<30;i++)
          {
          if(strcmp(chname,sys[i].name)==0)
            {
            flag2=1;
            sys[i].flag=0;
            printf("Deletetion successful");
            }
          }
          if(flag2==0)
          {
            printf("The specified file does not exist");
          }
          flag2=0;
          break;
  
  case 3:   //Search
  
  printf("Enter the name of the directory/file to be searched for");
  scanf("%s",chname);
  for(i=1;i<30;i++)
  {
    if(strcmp(chname,sys[i].name)==0)
    { 
      flag2=1;
      printf("Entity exists!");
    }
    
  }
  if(flag2==0)
  {
    printf("entity does not exist");
  }
  flag2=0;
  break;
  
  case 4: //display all
  printf("Displaying the file system:\n");
  for(i=1;i<30;i++)
  {
    if(i==2||i==4||i==8||i==16)
      printf("\n\n");
    if(sys[i].flag==1)
    {
      printf("%d)%s(%c)\t",i,sys[i].name,sys[i].type);
    }
  }
  break;
  
  case 5:exit(0);
  }
  }
}

void main()
{
int c;

printf("Enter the choice:\n\n1)Single Level Directory\n2)Two level directory\n3)Hierarchical\n");
scanf("%d",&c);

switch (c)
{
        case 1:printf("\nImplementing single level directory\n");
               singled();
                break;
        case 2:printf("\nImplementing two level directory\n");
                twod();
                break;
        case 3:printf("\nImplementing hierarchical directory\n");
                hierarchical();
                break;
}
}