文件管理系统一、实验目的通过设计一个多用户文件系统，了解操作系统中文件的组织与管理，熟悉文件管理所用的数据结构，加深对文件系统内部功能实现过程的理解。

二、实验内容1．用C语言或C++语言设计一个最多包括N个用户的多用户文件系统，约定每个用户最多保存M个文件。

同时限制一个用户在进入系统后，最多打开L个文件。

2．系统应具备一定的健壮性。

即能够检查用户所输入命令的正确性，出错时显示出必要的信息。

另外，对文件需设置必要的保护措施。

3．文件目录结构采用两级目录结构：主文件目录和用户文件目录#include"io.h"#include"conio.h"#include"stdio.h"#include"stdlib.h"#include"malloc.h"#include"string.h"#include"ctype.h"#define N 30 /*用户数*/#define M 20 /*一个用户可保存M个文件*/#define L 5 /*用户只能一次打开L个文件*/typedef struct MFD /*主文件目录*/{char username[100];char password[100];FILE fp; /*文件指针*/}MFD;///////////typedef struct UFD /*用户文件目录*/{char filename[256];char protect; /*保护码*/int length; /*文件长度*/}UFD;//////////typedef struct OFD /*打开文件目录*/{char filename[256];char opencode; /*打开保护码*/int fp; /*读写指针*/}OFD;//////////typedef struct COMM /*命令串*/{char string[256]; /*命令*/struct COMM *next;/*后继指针*/}COMM;////////////MFD mainfd[N]; /*主文件目录数组*/UFD userfd[M]; /*用户文件目录数组*/OFD openfd[L]; /*打开文件目录数组*/////////COMM*command; /*命令串指针*/char username[10];int usernum,savenum,opennum;int workfile;void init();void init_ufd(char *username);/*初始化用户文件目录*/ void mesg(char *str); /*消息*/char *getpass(); /*设置口令函数声明*/ char *getuser(); /*设置用户函数声明*/ COMM *readcommand(); /*读命令串函数声明*/ void login(); /*用户登录*/void logout(); /*用户注销*/void setpass(); /*设置口令*/void create(); /*创建文件*/void mydelete(); /*删除文件*/void myread(); /*读文件*/void myopen(); /*打开文件*/void myclose(); /*关闭文件*/void mywrite(); /*写文件*/void help(); /*帮助*/void dir(); /*列文件目录*/void mycopy(); /*复制文件*/void myrename(); /*重命名文件名*//////////////void main(){init();for(;;){readcommand();if(strcmp(command->string,"create")==0)create();else if(strcmp(command->string,"delete")==0)mydelete();else if(strcmp(command->string,"open")==0)myopen();else if(strcmp(command->string,"close")==0)myclose();else if(strcmp(command->string,"read")==0)myread();else if(strcmp(command->string,"write")==0)mywrite();else if(strcmp(command->string,"copy")==0)mycopy();else if(strcmp(command->string,"rename")==0)myrename();else if(strcmp(command->string,"login")==0)login();else if(strcmp(command->string,"setpass")==0)setpass();else if(strcmp(command->string,"logout")==0)logout();else if(strcmp(command->string,"help")==0)help();else if(strcmp(command->string,"dir")==0)dir();else if(strcmp(command->string,"exit")==0)break;elsemesg("Bad command!");}}///////////////////void init(){FILE *fp;char tempname[20],temppass[20];int i=0;usernum=0;savenum=0;opennum=0;strcpy(username,"");if((fp=fopen("mainfile.txt","r"))!=NULL){while(!feof(fp)){strcpy(tempname,"");fgets(tempname,20,fp);if(strcmp(tempname,"")!=0){fgets(temppass,20,fp);tempname[strlen(tempname)-1]='\0';temppass[strlen(tempname)-1]='\0';strcpy(mainfd[usernum].username,tempname);strcpy(mainfd[usernum].password,tempname);usernum++;}}fclose(fp);}}///////////////////////void init_ufd(char *username)/*初始化用户文件目录*/{FILE *fp;char tempfile[100],tempprot;int templength;savenum=0;opennum=0;workfile=-1;if((fp=fopen(username,"w+"))!=NULL){while(!feof(fp)){strcpy(tempfile,"");fgets(tempfile,50,fp);if(strcmp(tempfile,"")!=0){fscanf(fp,"%c",&tempprot);fscanf(fp,"%d",&templength);tempfile[strlen(tempfile)-1]='\0';strcpy(userfd[savenum].filename,tempfile);userfd[savenum].protect=tempprot;userfd[savenum].length=templength;savenum++;fgets(tempfile,50,fp);}}}fclose(fp);}////////////////////void mesg(char *str){printf("\n %s\n",str);}////////////////////////////char *getuser(){char username[20];char temp;int i;username[0]='\0';for(i=0;i<10;){while(!kbhit());temp=getch();if(isalnum(temp)||temp=='_'||temp==13){username[i]=temp;if(username[i]==13){username[i]='\0';break;}putchar(temp);i++;username[i]='\0';}}return(username);}///////////////////char *getpass(){char password[20];char temp;int i;password[0]='\0';for(i=0;i<10;){while(!kbhit());temp=getch();if(isalnum(temp)||temp=='_'||temp==13){password[i]=temp;if(password[i]==13){password[i]='\0';break;}putchar('*');i++;password[i]='\0';}}return(password);}///////////////COMM *readcommand(){char temp[256];char line[256];int i,end;COMM *newp,*p;command=NULL;strcpy(line,"");while(strcmp(line,"")==0){printf("\nc:\\>");gets(line);}for(i=0;i<=strlen(line);i++){if(line[i]==' ')i++;end=0;while(line[i]!='\0'&&line[i]!=' '){temp[end]=line[i];end++;i++;}if(end>0){temp[end]='\0';newp=(COMM *)malloc(sizeof(COMM *));strcpy(newp->string,temp);newp->next=NULL;if(command==NULL)command=newp;else{p=command;while(p->next!=NULL)p=p->next;p->next=newp;}}}p=command;return(command);}/////////////////////////////void login() /*用户注册*/{FILE *fp;int i;char password[20],confirm[20],tempname[20];if(command->next==NULL){printf("\n User Name:");strcpy(tempname,getuser());}else if(command->next->next!=NULL){mesg("Too many parameters!");return;}elsestrcpy(tempname,command->next->string);for(i=0;i<usernum;i++)if(strcmp(mainfd[i].username,tempname)==0)break; /*从mainfd表中查找要注册的用户*/ if(i>=usernum) /*新用户*/{printf("\n new user account,enter your password twice!");printf("\n Password:");strcpy(password,getpass());/*输入口令且返回之*/printf("\n Password:");strcpy(confirm,getpass()); /*第二次输入口令*/if(strcmp(password,confirm)==0)/*用户数不能超过N*/{if(usernum>=N)mesg("Create new account false!number of user asscount limited.\n login fasle!");else{strcpy(mainfd[usernum].username,tempname);/*把新用户和口令填入mainfd中*/strcpy(mainfd[usernum].password,password);usernum++;strcpy(username,tempname);mesg("Create a new user!\n login success!");init_ufd(username); /*初始化用户文件目录*/fp=fopen("mainfile.txt","w+"); /*把新用户填入mainfile.txt文件中*/for(i=0;i<usernum;i++){fputs(mainfd[i].username,fp);fputs("\n",fp);fputs(mainfd[i].password,fp);fputs("\n",fp);}fclose(fp);}}else{mesg("Create new account false! Error password.");mesg("login false!");}}else{printf("\n Password:");strcpy(password,getpass());if(strcmp(mainfd[i].password,password)!=0)mesg("Login false! Error password.");else{mesg("Login success!");strcpy(username,tempname);init_ufd(username);}}}/////////////////////////void logout() /*用户注销*/{if(command->next!=NULL)mesg("Too many parameters!");else if(strcmp(username,"")==0)mesg("No user login!");else{strcpy(username,"");opennum=0;savenum=0;workfile=-1;mesg("User logout!");}}////////////////////void setpass() /*修改口令*/{int i=0;FILE *fp;char oldpass[20],newpass[20],confirm[20];if(strcmp(username,"")==0)mesg("No user login!");else{printf("\n Old password:");strcpy(oldpass,getpass());for(int i=0;i<usernum;i++){if(strcmp(mainfd[i].username,username)==0)break;}if(strcmp(mainfd[i].password,oldpass)!=0)mesg("Old password error!");else{printf("\n New password:");strcpy(newpass,getpass());printf("\n Confirm password:");strcpy(confirm,getpass());if(strcmp(newpass,confirm)!=0)mesg("Password not change! confirm different.");else{strcpy(mainfd[i].password,newpass);mesg(" Password change !");fp=fopen("mainfile.txt","w+");for(i=0;i<usernum;i++){fputs(mainfd[i].username,fp);fputs("\n",fp);fputs(mainfd[i].password,fp);fputs("\n",fp);}fclose(fp);}}}}////////////////void create(){int i=0;FILE *fp;if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next!=NULL)mesg("Too many parameters!");else{for(i=0;i<savenum;i++){if(strcmp(userfd[i].filename,command->next->string)==0)break;}if(i<savenum)mesg("Error! the file already existed!");else if(savenum>=M)mesg("Error! connot create file! number of files limited!");else{strcpy(userfd[savenum].filename,command->next->string);userfd[i].protect='r';userfd[i].length=rand();savenum++;mesg("Create file success!");fp=fopen(username,"w+");for(i=0;i<savenum;i++){fputs(userfd[i].filename,fp);fputs("\n",fp);fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);}fclose(fp);}}}/////////////////void mydelete() /*删除*/{int i=0;int tempsave=0;FILE *fp;if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next!=NULL)mesg("Too many parameters!");else{for(i=0;i<savenum;i++){if(strcmp(userfd[i].filename,command->next->string)==0)break;}if(i>=savenum)mesg("Error! the file not existed!");else{tempsave=i;for(i=0;i<opennum;i++){if(strcmp(command->next->string,openfd[i].filename)==0)break;}if(i>=opennum)mesg("File not open");////////////////////////////////////////////else{if(tempsave==savenum-1)savenum--;else{for(;tempsave<savenum-1;tempsave++){strcpy(userfd[tempsave].filename,userfd[tempsave+1].filename);userfd[tempsave].protect=userfd[tempsave+1].protect;userfd[tempsave].length=userfd[tempsave+1].length;}savenum--;}mesg("Delete file success!");fp=fopen(username,"w+");for(i=0;i<savenum;i++){fputs(userfd[i].filename,fp);fputs("\n",fp);fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);}fclose(fp);}}}}//////////////////void myread() /*读*/{int i=0;int tempsave=0;char tempfile[100];if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next!=NULL)mesg("Too many parameters!");elsestrcpy(tempfile,command->next->string);for(i=0;i<savenum;i++){if(strcmp(tempfile,userfd[i].filename)==0)break;}if(i>=savenum)mesg("File not existed!");else{tempsave=i;for(i=0;i<opennum;i++){if(strcmp(tempfile,openfd[i].filename)==0)break;}if(i>=opennum)mesg("File not opened");else{if(userfd[tempsave].length<1000)printf("\n The file size is %d KB",userfd[tempsave].length);else if(userfd[tempsave].length==1000)printf("\n The file size is 1000 KB");elseprintf("\n The file size is %d,%d KB",userfd[tempsave].length/1000,userfd[tempsave].length%1000);mesg("File read");}}}}/////////////////void myopen()/*打开*/{int i=0;int type=0;char tempcode;char tempfile[100];if(strcmp(username,"")==0)mesg("No user login!");else if(command->next==NULL)mesg("Too few parameters!");{strcpy(tempfile,"");tempcode='r';if(strcmp(command->next->string,"/r")==0){tempcode='r';type=1;}else if(strcmp(command->next->string,"/w")==0){tempcode='w';type=1;}else if(strcmp(command->next->string,"/d")==0){tempcode='d';type=1;}else if(command->next->string[0]=='/')mesg("Error! /r/w/d request!");else if(command->next->next!=NULL)mesg("Too many parameters!");elsestrcpy(tempfile,command->next->string);if(type==1){if(command->next->next!=NULL){if(command->next->next->next!=NULL)mesg("Too many parameters!");elsestrcpy(tempfile,command->next->next->string);}elsemesg("Too few parameters!");}if(strcmp(tempfile,"")){for(i=0;i<savenum;i++){if(strcmp(tempfile,userfd[i].filename)==0)break;}if(i>=savenum)mesg("File not existed!");else{for(i=0;i<opennum;i++){if(strcmp(tempfile,openfd[i].filename)==0)break;}if(i<opennum){mesg("File already opened!");if(openfd[i].opencode!=tempcode){openfd[i].opencode=tempcode;mesg("File permission changed!");}}else if(opennum>=L){mesg("Error! connot open file! number of opened files limited!");}else{strcpy(openfd[opennum].filename,tempfile);openfd[opennum].opencode=tempcode;workfile=opennum;opennum++;mesg("File open success!");}}}}}///////////////////////void myclose()/*关闭*/{int i=0;int tempsave=0;char tempfile[100];if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next!=NULL)mesg("Too many parameters!");else{strcpy(tempfile,command->next->string);for(i=0;i<savenum;i++){if(strcmp(tempfile,userfd[i].filename)==0)break;}if(i>=savenum)mesg("File not existed!");else{for(i=0;i<opennum;i++){if(strcmp(tempfile,openfd[i].filename)==0)break;}if(i>=opennum)mesg("File not opened");else{if(i==opennum-1)opennum--;else{for(;i<opennum-1;i++){strcpy(openfd[i].filename,openfd[i+1].filename);openfd[i].opencode=openfd[i+1].opencode;}opennum--;}mesg("Close file success!");}}}}/////////////////////////void mywrite()/*写*/{int i=0;int tempsave=0;char tempfile[100];if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next!=NULL)mesg("Too many parameters!");else{strcpy(tempfile,command->next->string);for(i=0;i<savenum;i++){if(strcmp(tempfile,userfd[i].filename)==0)break;}if(i>=savenum)mesg("File not existed!");else{tempsave=i;for(i=0;i<opennum;i++){if(strcmp(tempfile,openfd[i].filename)==0)break;}if(i>=opennum)mesg("File not opened");else{mesg("File write");int tt=rand();if(userfd[tempsave].length<=1000)printf("\n The file size from %d KB to %d KB",userfd[tempsave].length,userfd[tempsave].length+tt);/* else if(userfd[tempsave].lenght=1000)printf("\n The file size from 1000 KB");*/elseprintf("\n The file size form %d,%d KB to %d,%d KB",userfd[tempsave].length/1000,userfd[tempsave].length%1000,userfd[tempsave].length+tt/10 00,userfd[tempsave].length+tt%1000);userfd[tempsave].length=userfd[tempsave].length+tt;}}}}///////////////////void help()/*帮助*/{static char *cmd[]={"login","setpass","logout","create","open","read","write","close","delete","dir","help","exit","copy","rename"};static char *cmdhlp[]={"aommand format: login [<username>]","command format:setpass","command format:logout","command format:create <filename>","command format:open [/r/w/d] <filename>","command format:read <filename>","command format:write <filename>","command format:close <filename>","command format:delete <filename>","command format:dir [/u/o/f]","command format:help [<command>]","command format:exit","command format:copy <source filename> <destination filename>","command format:rename <old filename> <new filename>"};static char *detail[]={"explain:user login in the file system.","explain:modify the user password.","explain:user logout the file system.","explain:creat a new file.","explain:/r -- read only [deflaut]\n\t /w -- list opened files \n\t /d --read,modify and delete.","explain:read the file.","explain:modify the file.","explain:close the file.","explain:delete the file.","explain:/u -- list the user account\n\t /0 -- list opened files\n\t /f --list user file[deflaut].","explain:<command> -- list the command detail format and explain.\n\t [deflaut] list the command.","explain:exit from the file sysytem.","explain:copy from one file to another file.","explain:modify the file name."};int helpnum=14;int i=0;if(command->next==NULL){mesg(cmdhlp[10]);mesg(detail[10]);mesg("step 1: login");printf("\t if old user then login,if user not exist then create new user");mesg("step 2: open the file for read(/r),write(/w)or delete(/d)");printf("\t you can open one or more files.one command can open one file");mesg("step 3: read,write or delete some one file");printf("\t you can operate one of the opened files.one command can open one file");mesg("step 4: close the open file");printf("\t you can close one of the opened files.one command can open one file");mesg("step 5: user logout.close all the user opened files");printf("\n command list:");for(i=0;i<helpnum;i++){if(i%4==0)printf("\n");printf(" %-10s",cmd[i]);}}else if(command->next->next!=NULL)mesg("Too many parameters!");else{for(i=0;i<helpnum;i++){if(strcmp(command->next->string,cmd[i])==0)break;}if(i>=helpnum)mesg("the command not existed!");else{mesg(cmdhlp[i]);mesg(detail[i]);}}}//////////////////////void dir()/*列目录文件*/{int i=0;int type=0;char tempcode;if(strcmp(username,"")==0)mesg("No user login!");else{if(command->next==NULL){tempcode='f';}else{if(strcmp(command->next->string,"/u")==0){tempcode='u';}else if(strcmp(command->next->string,"/o")==0){tempcode='o';}else if(strcmp(command->next->string,"/f")==0){tempcode='f';}else if(command->next->string[0]=='/')mesg("Error! /u/o/f request!");else if(command->next->next!=NULL)mesg("Too many parameters!");}if('u'==tempcode){printf("list the user account\n");printf("usename\n");for(i=0;i<usernum;i++){printf("%s\n",mainfd[i].username);}}else if('f'==tempcode){printf("list opened files\n");printf("filename length protect\n");for(i=0;i<savenum;i++){printf("%s%s%d%s%s%c\n",userfd[i].filename," ",userfd[i].length,"KB"," ",userfd[i].protect);}}else if('o'==tempcode){printf("list user files\n");printf("filename opencode\n");for(i=0;i<opennum;i++){printf("%s%s%c\n",openfd[i].filename," ",openfd[i].opencode);}}}}/////////////////////////void mycopy()/*复制*/{char sourfile[256],destfile[256];int i=0,j=0,temp=0;FILE *fp;char tempchar;if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next==NULL)mesg("Too few parametets!");else if(command->next->next->next!=NULL)mesg("Too many parameters!");else{strcpy(sourfile,command->next->string);strcpy(destfile,command->next->next->string);for(i=0;i<savenum;i++){if(strcmp(sourfile,userfd[i].filename)==0)break;}temp=i;if(i>=savenum)printf("\n the source file not eixsted!");else{for(i=0;i<opennum;i++){if(strcmp(sourfile,openfd[i].filename)==0)break;}if(i>=opennum)printf("\n the source file not opened!");else{for(j=0;j<opennum;j++){if(strcmp(destfile,openfd[i].filename)==0)break;}if(j<opennum)mesg("Error! the destination file opened,you must close it first.");else{for(j=0;j<savenum;j++){if(strcmp(destfile,userfd[i].filename)==0)break;}if(j<savenum){mesg("Warning! the destination file exist!");printf("\n Are you sure to recover if ? [Y/N]");while(!kbhit());tempchar=getch();if(tempchar=='N'||tempchar=='n')mesg("Cancel! file not copy.");else if(tempchar=='Y'||tempchar=='y'){mesg("File copy success!file recovered!");userfd[j].length=userfd[i].length;userfd[j].protect=userfd[i].protect;fp=fopen(username,"w+");for(i=0;i<savenum;i++){fputs(userfd[i].filename,fp);fputs("\n",fp);fprintf(fp,"%C\n%d\n",userfd[i].protect,userfd[i].length);}fclose(fp);}}else if(savenum>=M)mesg("copy false! file total limited.");else{strcpy(userfd[savenum].filename,destfile);userfd[savenum].length=userfd[temp].length;userfd[savenum].protect=userfd[temp].protect;savenum++;fp=fopen(username,"w+");for(i=0;i<savenum;i++){fputs(userfd[i].filename,fp);fputs("\n",fp);fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);}fclose(fp);mesg("File copy success!");}}}}}}///////////////////////void myrename()/*文件重命名*/{char oldfile[256],newfile[256];int i=0,temp=0;if(strcmp(username,"")==0)mesg("No user lgoin!");else if(command->next==NULL)mesg("Too few parametets!");else if(command->next->next==NULL)mesg("Too few parametets!");else if(command->next->next->next!=NULL)mesg("Too many parameters!");else{strcpy(oldfile,command->next->string);strcpy(newfile,command->next->next->string);for(i=0;i<savenum;i++){if(strcmp(oldfile,userfd[i].filename)==0)break;}temp=i;if(temp>=savenum)printf("\n the source file not eixsted!");else if(temp!=i&&i<savenum){printf("\n newfile and the existing files is the same name, please re-naming!");}else{for(i=0;i<opennum;i++){if(strcmp(oldfile,openfd[i].filename)==0)break;}if(i>=opennum)printf("\n the source file not opened!");else if(strcmp(oldfile,newfile)==0){printf("Rename false! oldfile and newfile can not be the same.");}else{strcpy(openfd[i].filename,newfile);strcpy(userfd[temp].filename,newfile);mesg("Rename file success!\n");}}}}。