📄 myfs.txt
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save_dir(dir_id); //立即写回磁盘
}
void open_file_system() //打开文件系统
{
int flag=0;
fp=fopen(file_system_name,"rb"); //以读方式打开，如果不存在，则创建文件系统
if(fp==NULL)
{
create_file_system();
flag=1;
}
fp=fopen(file_system_name,"rb+"); //以读写方式打开
if(fp==NULL)
{
printf("Open file system error!\n");
exit(1);
}
if(flag==0) //如果该文件系统早就创建，则将其信息读入主存
{
fseek(fp,0,SEEK_SET); //读超级块信息
fread(&used_dir,sizeof(int),1,fp);
fread(&used_file,sizeof(int),1,fp);
fread(&used_block,sizeof(int),1,fp);
for(int i=0;i<DIR_NUM;i++)
fread(&dir_flag[i],sizeof(int),1,fp);
for(i=0;i<FILE_NUM;i++)
fread(&file_flag[i],sizeof(int),1,fp);
for(i=0;i<BLOCK_NUM;i++)
fread(&block_flag[i],sizeof(int),1,fp);
for(i=0;i<DIR_NUM;i++) //读目录及文件的控制信息
if(dir_flag[i]==1)
{
fseek(fp,sizeof(int)*(DIR_NUM+FILE_NUM+BLOCK_NUM+3)+sizeof(struct dir_node)*i,SEEK_SET);
fread(&dir[i],sizeof(struct dir_node),1,fp);
}
for(i=0;i<FILE_NUM;i++)
if(file_flag[i]==1)
{
fseek(fp,sizeof(int)*(DIR_NUM+FILE_NUM+BLOCK_NUM+3)+sizeof(struct dir_node)*DIR_NUM+sizeof(struct file_node)*i,SEEK_SET);
fread(&file[i],sizeof(struct file_node),1,fp);
}
collect(0);
}
fflush(fp);
curr=0;
curr_dir=&dir[curr]; //设置当前目录为根目录
strcpy(curr_path,curr_dir->dir_name);
strcat(curr_path,"/");
}
void close_file_system() //关闭文件系统，并保存相应信息，这是系统
{ //隐式保存文件及目录的方法
save(0);
for(int i=0;i<DIR_NUM;i++)
if(al_dflag[i]%2!=0)
write_bit(i,0);
for(i=0;i<FILE_NUM;i++)
if(al_fflag[i]%2!=0)
write_bit(i,1);
for(i=0;i<BLOCK_NUM;i++)
if(al_bflag[i]%2!=0)
write_bit(i,2);
fseek(fp,0,SEEK_SET);
fwrite(&used_dir,sizeof(int),1,fp);
fwrite(&used_file,sizeof(int),1,fp);
fwrite(&used_block,sizeof(int),1,fp);
fclose(fp);
}
void help() //打印命令及解释
{
printf("Commands: Explanation:\n\n");
printf(" exit: Exit!\n");
printf(" dir: Show files and directories!\n");
printf(" tree: Show directory tree!\n");
printf(" mkf: Create a new file!\n");
printf(" mkd: Create a new directory!\n");
printf(" delf: Delete a file!\n");
printf(" deld: Delete a directory!\n");
printf(" cd: Change the current directory!\n");
printf(" write: Write a string to a file!\n");
printf(" read: Read a string from a file!\n");
printf(" edit: Edit a file!\n");
printf(" cpf: Copy a file!\n");
printf(" cpd: Copy a directory!\n");
printf(" format: Format the disk!\n");
printf(" help: Print commands!\n");
printf(" savef: Save a file!\n");
printf(" saved: Save a directory!\n");
printf(" rnf: Rename a file!\n");
printf(" rnd: Rename a directory!\n");
}
void run() //命令接受及解析，转入相应函数运行
{
char *command[19]={"exit","dir","mkf","mkd","delf","deld","cd","write","read","cpf","cpd","savef","saved","format","help","tree","rnf","rnd","edit"};
char buf1[256];
char buf2[2048];
char buf3[128];
char buf4[128];
int key,num,offset,index,del_pos,parent,buf_id,file_id,p;
char *s,flag='\0';
printf("Input help to print commands!\n");
while(1)
{
strcpy(buf1,"");
strcpy(buf2,"");
strcpy(buf3,"");
strcpy(buf4,"");
p=0;
printf("\n%s\n",curr_path);
cin.getline(buf1,256,'\n');
key=-1;
for(int i=0;i<=18;i++) //命令匹配
if(strncmp(buf1,command[i],(int)strlen(command[i]))==0)
{
key=i;
break;
}
if(key!=-1) //参数分解
{
s=strchr(buf1,' ');
if(s!=NULL)
{
index=(int)(s-buf1);
while(buf1[index]==' ')
index++;
strcpy(buf3,buf1+index);
s=strchr(buf3,' ');
if(s!=NULL)
{
num=(int)(s-buf3);
buf3[num]='\0';
}
s=strrchr(buf1+index,' ');
if(s!=NULL)
{
index=(int)(s-buf1);
strcpy(buf4,buf1+index+1);
}
}
}
switch(key)
{
case -1:
printf("The command you input not exist!\n");
break;;
case 0:
return;
case 1:
list();
break;
case 2:
if((int)strlen(buf3)==0)
{
printf("please input the name of the file:\n");
cin.getline(buf3,128,'\n');
}
if(create(buf3)!=-1)
printf("Succeed!\n");
break;
case 3:
if((int)strlen(buf3)==0)
{
printf("please input the name of the directory:\n");
cin.getline(buf3,128,'\n');
}
if(md(buf3)!=-1)
printf("Succeed!\n");
break;
case 4:
if((int)strlen(buf3)==0)
{
printf("please input the name of the file:\n");
cin.getline(buf3,128,'\n');
}
if(delfile(buf3)!=-1)
printf("Succeed!\n");
break;
case 5:
if((int)strlen(buf3)==0)
{
printf("please input the name of the directory:\n");
cin.getline(buf3,128,'\n');
}
parent=get_parent(buf3,p);
if(parent==-1)
{
printf("Path name error!\n");
break;
}
if((del_pos=search(parent,buf3+p,0,index))==-1)
{
printf("The directory to delete not exist in current directory!\n");
break;
}
if(dir[del_pos].dir_count>0 || dir[del_pos].file_count>0)
{
printf("The directory is not empty!\nAre you sure to delete it?('Y' or 'N')\n");
cin.getline(&flag,32,'\n');
if(flag!='Y' && flag!='y')
break;
}
del_dir(parent,del_pos,index);
printf("Succeed!\n");
break;
case 6:
if((int)strlen(buf3)==0)
{
printf("please input the name of the diectory:\n");
cin.getline(buf3,128,'\n');
}
if(change_dir(buf3)!=-1)
printf("Succeed!\n");
break;
case 7:
if((int)strlen(buf3)==0)
{
printf("please input the file name:\n");
cin.getline(buf3,128,'\n');
}
printf("please input the offset:\n");
scanf("%d",&offset);
printf("please input the string:\n");
cin.getline(buf2,256,'\n');
if(write_file(buf3,offset,strlen(buf2),buf2)!=-1)
printf("Succeed!\n");
break;
case 8:
if((int)strlen(buf3)==0)
{
printf("please input the file name:\n");
cin.getline(buf3,128,'\n');
}
printf("please input the offset:\n");
scanf("%d",&offset);
printf("please input the number of characters:\n");
scanf("%d",&num);
if(read_file(buf3,offset,num,buf2)!=-1)
{
printf("Succeed!\n");
printf("%s\n",buf2);
}
break;
case 9:
if((int)strlen(buf3)==0)
{
printf("please input the name of the dest dir:\n");
cin.getline(buf3,128,'\n');
}
if((int)strlen(buf4)==0)
{
printf("please input the name of the source file:\n");
cin.getline(buf4,128,'\n');
}
if(copy_file(buf3,buf4)!=-1)
printf("Succeed!\n");
break;
case 10:
if((int)strlen(buf3)==0)
{
printf("please input the name of the dest dir:\n");
cin.getline(buf3,128,'\n');
}
if((int)strlen(buf4)==0)
{
printf("please input the name of the source dir:\n");
cin.getline(buf4,128,'\n');
}
if(copy_dir(buf3,buf4)!=-1)
printf("Succeed!\n");
break;
case 11:
if((int)strlen(buf3)==0)
{
printf("please input the name of the file:\n");
cin.getline(buf3,128,'\n');
}
if(savefile(buf3)!=-1)
printf("Succeed!\n");
break;
case 12:
if((int)strlen(buf3)==0)
{
printf("please input the name of the directory:\n");
cin.getline(buf3,128,'\n');
}
if(saved(buf1)!=-1)
printf("Succeed!\n");
break;
case 13:
format();
printf("Succeed!\n");
break;
case 14:
help();
break;
case 15:
show_tree();
break;
case 16:
if((int)strlen(buf3)==0)
{
printf("please input the name of the file:\n");
cin.getline(buf3,128,'\n');
}
if((int)strlen(buf4)==0)
{
printf("please input the new name:\n");
cin.getline(buf4,128,'\n');
}
if(rename_file(buf3,buf4)!=-1)
printf("Succeed!\n");
break;
case 17:
if((int)strlen(buf3)==0)
{
printf("please input the name of the dir:\n");
cin.getline(buf3,128,'\n');
}
if((int)strlen(buf4)==0)
{
printf("please input the new name:\n");
cin.getline(buf4,128,'\n');
}
if(rename_dir(buf3,buf4)!=-1)
printf("Succeed!\n");
break;
case 18:
if((int)strlen(buf3)==0)
{
printf("please input the name of the file:\n");
cin.getline(buf3,128,'\n');
}
parent=get_parent(buf3,p);
if(parent==-1)
{
printf("Path name error!\n");
break;
}
file_id=search(parent,buf3+p,1,index);
if(file_id==-1)
{
printf("The file not exist!\n");
break;
}
buf_id=open_file(file_id,2);
printf("\n%s\n\n",buffer[buf_id].buf);
printf("Please select:\nD(delete) I(insert) Q(cancel)\n");
cin.getline(&flag,10,'\n');
if(flag=='D' || flag=='d')
{
printf("Please input the start position and the finish position:\n");
scanf("%d %d",&offset,&index);
if(offset>=index)
{
printf("Position error!\n");
break;
}
edit(buf_id,2,offset,index,NULL);
}
else if(flag=='I' || flag=='i')
{
printf("Please input the insert position:\n");
scanf("%d",&offset);
printf("Please input the string:\n");
cin.getline(buf1,256,'\n');
edit(buf_id,1,offset,0,buf1);
}
else
break;
printf("Succeed!\n");
break;
}
}
}
void main()
{
open_file_system();
run();
close_file_system();
}
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