操作系统课程设计报告

1、操作系统课程设计报告专 业：学 号：姓 名： 提交日期：【设计目的】（1）本实验的目的是通过一个简单多用户文件系统的设计，加深理解文件系统的内部功能和内部实现。（2）结合数据结构、程序设计、计算机原理等课程的知识，设计一个二级文件系统，进一步理解操作系统。（3）通过分对实际问题的分析、设计、编程实现，提高学生实际应用、编程的能力【设计内容】为Linux系统设计一个简单的二级文件系统。要求做到以下几点：1.可以实现下列几条命令：login 用户登录dir 列目录create 创建文件delete 删除文件open 打开文件close 关闭文件read 读文件write 写文件cd 进出目录2列目

2、录时要列出文件名，物理地址，保护码和文件长度3源文件可以进行读写保护【实验环境】C+/VC+【源程序清单】#include stdio.h#include string.h#include conio.h#include stdlib.h#define MAXNAME 25 /*the largest length of mfdname,ufdname,filename*/#define MAXCHILD 50 /*the largest child*/#define MAX (MAXCHILD*MAXCHILD) /*the size of fpaddrno*/typedef struct

3、/*the structure of OSFILE*/int fpaddr; /*file physical address*/ int flength; /*file length*/ int fmode; /*file mode:0-Read Only;1-Write Only;2-Read and Write; 3-Protect;*/ char fnameMAXNAME; /*file name*/ OSFILE;typedef struct /*the structure of OSUFD*/char ufdnameMAXNAME; /*ufd name*/OSFILE ufdfil

4、eMAXCHILD; /*ufd own file*/OSUFD;typedef struct /*the structure of OSUFDLOGIN*/char ufdnameMAXNAME; /*ufd name*/ char ufdpword8; /*ufd password*/ OSUFD_LOGIN;typedef struct /*file open mode*/int ifopen; /*ifopen:0-close,1-open*/ int openmode; /*0-read only,1-write only,2-read and write,3-initial*/OS

5、UFD_OPENMODE;OSUFD *ufdMAXCHILD; /*ufd and ufd own files*/OSUFD_LOGIN ufd_lp;int ucount=0; /*the count of mfds ufds*/int fcountMAXCHILD; /*the count of ufds files*/int loginsuc=0; /*whether login successfully*/char usernameMAXNAME; /*record login users name22*/char dirnameMAXNAME;/*record current di

6、rectory*/int fpaddrnoMAX; /*record file physical address num*/OSUFD_OPENMODE ifopenMAXCHILDMAXCHILD; /*record file open/close*/int wgetchar; /*whether getchar()*/FILE *fp_mfd,*fp_ufd,*fp_file_p,*fp_file;void LoginF(); /*LOGIN FileSystem*/void DirF(); /*Dir FileSystem*/void CdF(); /*Change Dir*/void

7、CreateF(); /*Create File*/void DeleteF(); /*Delete File*/void ModifyFM(); /*Modify FileMode*/void OpenF(); /*Open File*/void CloseF(); /*Close File*/void ReadF(); /*Read File*/void WriteF(); /*Write File*/void QuitF(); /*Quit FileSystem*/void help();char *rtrim(char *str); /*remove the trailing blan

8、ks.*/char *ltrim(char *str); /*remove the heading blanks.*/void InputPW(char *password); /*input password,use * replace*/void SetPANo(int RorW); /*Set physical address num*/int ExistD(char *dirname); /*Whether DirName Exist,Exist-i,Not Exist-0*/int WriteF1(); /*write file*/int ExistF(char *filename)

9、; /*Whether FileName Exist,Exist-i,Not Exist-0*/int FindPANo(); /*find out physical address num*/void clrscr()system(cls);int main()int i,choice1;char choice50; /*choice operation:dir,create,delete,open,delete,modify,read,write*/int choiceend=1; /*whether choice end*/char *rtrim(char *str); /*remove

10、 the trailing blanks.*/char *ltrim(char *str); /*remove the heading blanks.*/if(fp_mfd=fopen(c:osfilemfd.txt,rb)=NULL)fp_mfd=fopen(c:osfilemfd.txt,wb);fclose(fp_mfd);for(i=0;i,strupr(dirname);elseprintf(Bad command or file name.nC:%s,strupr(username); gets(choice);/输入所选择的 strcpy(choice,ltrim(rtrim(s

11、trlwr(choice);/将输入的值赋给choice if (strcmp(choice,dir)=0) choice1=1;/依次将输入的值与dir，create等进行比较 else if(strcmp(choice,create)=0) choice1=2;/如果输入create将choice1置为2通过switch选择，以下依次类推 else if(strcmp(choice,delete)=0) choice1=3; else if(strcmp(choice,attrib)=0) choice1=4; else if(strcmp(choice,open)=0) choice1=

12、5; else if(strcmp(choice,close)=0) choice1=6; else if(strcmp(choice,read)=0) choice1=7; else if(strcmp(choice,write)=0) choice1=8; else if(strcmp(choice,exit)=0) choice1=9; else if(strcmp(choice,cls)=0) choice1=10; else if(strcmp(choice,cd)=0) choice1=11; else if(strcmp(choice,help)=0) choice1=20; e

13、lse choice1=12;/choice1=12时跳转到default，然后继续循环switch(choice1)case 1:DirF();choiceend=1;break;case 2:CreateF();choiceend=1;if(!wgetchar) getchar();break;case 3:DeleteF();choiceend=1;if(!wgetchar)getchar();break;case 4:ModifyFM();choiceend=1;if(!wgetchar) getchar();break;case 5:OpenF();choiceend=1;if (!

14、wgetchar) getchar();break;case 6:CloseF();choiceend=1;if (!wgetchar) getchar();break;case 7:ReadF();choiceend=1;if (!wgetchar) getchar();break;case 8:WriteF();choiceend=1;if (!wgetchar) getchar();break;case 9:printf(nYou have exited this system.); QuitF();exit(0);break;case 10:clrscr();choiceend=1;b

15、reak;case 11:CdF();choiceend=1;break;case 20:help();choiceend=1;break;default:choiceend=0;elseprintf(nAccess denied.);/登录成功void help(void)printf(nThe Command Listn);printf(nCd Attrib Create write Read Open Cls Delete Exit Closen);char *rtrim(char *str) /*除去末尾端的空格指针指向字符串第一个*/int n=strlen(str)-1;/n为字符

16、串长度减1while(n=0)if(*(str+n)!= )/末尾不存在空格*(str+n+1)=0;/n表示结束符break;else n-;/如果存在空格将空格去掉if (nufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);fcountj=0;for(i=0;fread(&ufdj-ufdfilei,sizeof(OSFILE),1,fp_ufd)!=0;i+,fcountj+)ifopenji.ifopen=0;ifopenji.openmode=4;fclose(fp_ufd);fclose(fp_mfd);ucount=j;Set

17、PANo(0);printf(nnLogin successful! Welcome to this FileSystemnn);loginsuc=1;return;elseprintf(nn);flag=1;while(flag)printf(Login Failed! Password Error. Try Again(Y/N):);gets(a);ltrim(rtrim(a);if (strcmp(strupr(a),Y)=0)loginsuc=0;flag=0;else if(strcmp(strupr(a),N)=0)loginsuc=0;flag=0;return;elseprin

18、tf(New Password(=8):);InputPW(loginpw); /*input new password,use * replace*/printf(nConfirm Password(ufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);for(i=0;fread(&ufdj-ufdfilei,sizeof(OSFILE),1,fp_ufd)!=0;i+,fcountj+)ifopenji.ifopen=0; ifopenji.openmode=4;fclose(fp_ufd);fclose(fp_mfd);ucount=j;

19、SetPANo(0);printf(nnLogin Successful! Welcome to this Systemnn);loginsuc=1;return; elseprintf(nn);flag=1;while(flag)printf(Login Failed! Password Error. Try Again(Y/N):);gets(a);ltrim(rtrim(a);if (strcmp(strupr(a),Y)=0)loginsuc=0;flag=0;else if(strcmp(strupr(a),N)=0)loginsuc=0;flag=0;return;void Set

20、PANo(int RorW) /*Set physical address num,0-read,1-write*/int i,j;if (RorW=0)if(fp_file_p=fopen(c:osfilefilefile_p.txt,rb)=NULL)/如果文件未读成功 fp_file_p=fopen(c:osfilefilefile_p.txt,wb);/创建该文件fclose(fp_file_p); fp_file_p=fopen(c:osfilefilefile_p.txt,rb);/for(i=0;fread(&j,sizeof(int),1,fp_file_p)!=0;i+)fp

21、addrnoj=1;/真正模拟的位示图的关系/*for(i=1;iMAX;i+)if (i%13)=0)fpaddrnoi=1;*/elsefp_file_p=fopen(c:osfilefilefile_p.txt,wb);/*for(i=1;iMAX;i+)if(i%13)=0)fpaddrnoi=0;*/for(i=0;iMAX;i+)if (fpaddrnoi=1)/表示已使用fwrite(&i,sizeof(int),1,fp_file_p);/把第几个扇区号写进文件fclose(fp_file_p);void InputPW(char *password) /*input pass

22、word,use * replace*/int j;for(j=0;j0)/且密码个数大于0j-;j-;putchar(b);putchar( );putchar(b); /b表示退格，putchar函数只能用于单个字符输出else j-;elsepasswordj=0; /0是字符串的结束符，如果输出完毕则终止break;passwordj=0;void DirF() /*Dir FileSystem*/int i,j,count=0;char sfmode25,sfpaddr25,str25;clrscr();if (strcmp(strupr(ltrim(rtrim(dirname),)

23、!=0)printf(nnC:%sdirn,dirname);printf(n%14s%16s%14s%10s%18sn,FileName,FileAddress,FileLength,Type,FileMode);j=ExistD(dirname);for(i=0;iufdfilei.fpaddr,str,10);strcpy(sfpaddr,file);strcat(sfpaddr,str);if (ufdj-ufdfilei.fmode=0) strcpy(sfmode,Read Only);else if(ufdj-ufdfilei.fmode=1) strcpy(sfmode,Wri

24、te Only);else if(ufdj-ufdfilei.fmode=2)strcpy(sfmode,Read And Write);else strcpy(sfmode,Protect);printf(%14s%16s%14d%10s%18sn,ufdj-ufdfilei.fname,sfpaddr,ufdj-ufdfilei.flength,sfmode);printf(n %3d file(s)n,fcountj);elseprintf(nnC:dirn);printf(n%14s%18s%8sn,DirName,OwnFileCount,Type);for(i=0;iufdname

25、,fcounti,);count=count+fcounti;printf(n %3d dir(s),%5d file(s)n,ucount,count);int ExistD(char *dirname) /*Whether DirName Exist,Exist-i,Not Exist-0*/int i;int exist=0;for(i=0;iufdname),strupr(dirname)=0)exist=1;break;if (exist) return(i);else return(-1);void CdF() /*Exchange Dir*/char dnameMAXNAME;p

26、rintf(nPlease input DirName (cd.-Previous dir; DirNAME-cd DirNAME):);gets(dname);ltrim(rtrim(dname);if (ExistD(dname)=0) strcpy(dirname,strupr(dname);elseif(strcmp(strupr(dname),CD.)=0) strcpy(ltrim(rtrim(dirname),);else printf(nError.%s does not exist.n,dname);void CreateF() /*Create File*/int fpad

27、drno,flag=1,i;char fnameMAXNAME,str50,str150,a25;char fmode25;if (strcmp(strupr(dirname),strupr(username)!=0)printf(nError. You must create file in your own dir.n);wgetchar=1;elseprintf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);if (ExistF(fname)=0)printf(nError. Name %s has already exi

28、sted.n,fname);wgetchar=1;elseprintf(Please input FileMode(0-Read Only, 1-Write Only, 2-Read and Write, 3-Protect):);gets(fmode);ltrim(rtrim(fmode);if(strcmp(fmode,0)=0)|(strcmp(fmode,1)=0)|(strcmp(fmode,2)=0)|(strcmp(fmode,3)=0)fpaddrno=FindPANo();if (fpaddrno=0)i=ExistD(username);strcpy(ufdi-ufdfil

29、efcounti.fname,fname);ufdi-ufdfilefcounti.fpaddr=fpaddrno;ufdi-ufdfilefcounti.fmode=atoi(fmode);ifopenifcounti.ifopen=0;ifopenifcounti.openmode=4;strcpy(str,c:osfilefilefile);itoa(fpaddrno,str1,10);strcat(str,str1);strcat(str,.txt);fp_file=fopen(str,wb);fclose(fp_file);fcounti+;while(flag)printf(Inp

30、ut text now(Y/N):);gets(a);ltrim(rtrim(a);ufdi-ufdfilefcounti-1.flength=0;if(strcmp(strupr(a),Y)=0)fp_file=fopen(str,wb+);ufdi-ufdfilefcounti-1.flength=WriteF1();flag=0;else if(strcmp(strupr(a),N)=0)flag=0;wgetchar=1;printf(n%s has been created successfully!n,fname);elseprintf(nFail!No Disk Space. P

31、lease format your disk.n);wgetchar=1;elseprintf(nError. FileModes Range is 0-3n);wgetchar=1;int ExistF(char *filename) /*该函数检测某文件是否存在*/int i,j;int exist=0;j=ExistD(dirname);for(i=0;iufdfilei.fname),strupr(filename)=0)exist=1;break;if (exist) return(i);else return(-1);/找出没有使用的磁盘号，然后加以使用，返回值为该磁盘号int F

32、indPANo() /*find out physical address num*/int i;for(i=0;iMAX;i+)if (fpaddrnoi=0) /找到没有使用的磁盘号fpaddrnoi=1; /然后加以使用break;if (iMAX) return(i);else return(-1);int WriteF1() /*write file*/int length=0;char c;printf(Please input text(# stands for end):n);while(c=getchar()!=#)fprintf(fp_file,%c,c); /传送格式化输

33、出到一个fp_file文件中if (c!=n) length+;fprintf(fp_file,n);fclose(fp_file);return(length);void OpenF() /*打开文件*/int fc, i; /定义两个整型变量char fnameMAXNAME, fmode25; /定义两个字符数组int fm;printf(nPlease enter filename:);gets(fname); /从键盘获得文件名ltrim(rtrim(fname); /出去前后的空格if(ExistF(fname)0) /判断文件是否存在printf(nError.Name%sis

34、not existed.n,fname); /文件不存在wgetchar = 1;else /如果存在文件i = ExistD(username); /获取用户标识for(int a = 0; a ufdfilea.fname)=0) /如果文件名匹配fc=a; /记住是第几个文件break;ifopenifc.ifopen = 1; /设置ifopen数组的第i个用户的第fc个文件的状态未打开printf(please input OpenMode(0-Read Only, 1-Write Only, 2-Read and Write, 3-Protect):);gets(fmode); /

35、得到用户输入的打开权限fm = atoi(fmode); /字符串转成整型ifopenifc.openmode = fm; /设置ifopen的打开模式printf(nOpen successed);wgetchar = 1;void CloseF() /*关闭文件*/char fnameMAXNAME; /定义一个字符数组int i,k;if(strcmp(strupr(dirname),strupr(username)!=0) /判断所处的目录名是否存在printf(nerror.you can only moddify filemode in yourself dir.n); /只能关闭

36、自己目录下的文件elseprintf(nplease enter filename:);gets(fname); /输入需要关闭的文件名ltrim(rtrim(fname); /除去前面和后面的空格i = ExistF(fname); /获取用户标识if(i=0)k = ExistD(username);if(ifopenki.ifopen=0) /文件已被关闭printf(nError.Name%shas been closed.you can not close it again.n,fname);else /文件关闭成功ifopenki.ifopen=0; /ifopen的状态设为0ifopenki.openmode=4; /打开状态为4printf(%shas been closed successfully!,fname);else