实 验 报 告

实验课程名称： 计算机操作系统

本次实验是第 6 次，名称为： 文件系统设计

学 生 姓 名： 袁依洁 班 级 软件122 学 号 12477225

学 院（系）： 信息数理学院 指 导 教 师： 张英丽

成 绩：

实 验 时 间： 2014年 12 月 3 日 2014 年 12 月 3 日

实验六 文件系统设计

1．目的和要求

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．实验内容

为DOS系统设计一个简单的二级文件系统，可以实现下列几条命令

DIR 列文件目录

CREATE 创建文件

DELETE 删除文件

MODIFY 修改文件

OPEN 打开文件

CLOSE 关闭文件

列目录时要列出文件名，物理地址，保护码和文件长度。

3．实验环境

①PC兼容机

②Windows、DOS系统、Turbo c 2.0

③C语言

4．实验提示

①首先应确定文件系统的数据结构：主目录、活动文件等。主目录文件的形式存放于磁盘，这样便于查找和修改。

主目录结构：

Ufdname 用户名

Ufdfile 指向用户的活动文件

活动文件结构：

Fpaddr 文件物理地址

Flength 文件长度

Fmode 文件属性（file mode:0-Read Only;1-Write Only;2-Read and Write(default)）

Fname 文件名称

②用户创建的文件，可以编号存储于磁盘上。如：file0,file1,file2…并以编号作为物理地址，在目录中进行登记。

③本程序需要在c:下建一个名为osfile的目录及一个名为file的子目录，在利用程序创建了文件系统后，可以在这个文件夹下查看到相关的内容。

5．实验程序

#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 /*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(default);*/

char fname[MAXNAME]; /*file name*/

} OSFILE;

typedef struct /*the structure of OSUFD*/

{

char ufdname[MAXNAME]; /*ufd name*/

OSFILE ufdfile[MAXCHILD]; /*ufd own file*/

}OSUFD;

typedef struct /*the structure of OSUFD'LOGIN*/

{

char ufdname[MAXNAME]; /*ufd name*/

char ufdpword[8]; /*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*/

}OSUFD_OPENMODE;

OSUFD *ufd[MAXCHILD]; /*ufd and ufd own files*/

OSUFD_LOGIN ufd_lp;

int ucount=0; /*the count of mfd's ufds*/

int fcount[MAXCHILD]; /*the count of ufd's files*/

int loginsuc=0; /*whether login successfully*/

char username[MAXNAME]; /*record login user's name22*/

char dirname[MAXNAME];/*record current directory*/

int fpaddrno[MAX]; /*record file physical address num*/

OSUFD_OPENMODE ifopen[MAXCHILD][MAXCHILD]; /*record file open/close*/

int wgetchar; /*whether getchar()*/

FILE *fp_mfd,*fp_ufd,*fp_file_p,*fp_file;

void main()

{

int i,j,choice1;

char choice[50]; /*choice operation:dir,create,delete,open,delete,modify,read,write*/

int choiceend=1; /*whether choice end*/

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

void LoginF(); /*LOGIN FileSystem*/

void DirF(); /*Dir FileSystem*/

void CdF(); /*Change Dir*/

void 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();

if((fp_mfd=fopen("c:\\osfile\\mfd","rb"))==NULL)

{

fp_mfd=fopen("c:\\osfile\\mfd","wb");

fclose(fp_mfd);

}

for(i=0;i

/*textattr(BLACK*16|WHITE);*/

/*clrscr();*/ /*clear screen*/

LoginF(); /*user login*/

/*clrscr();*/

if(loginsuc==1) /*Login Successfully*/

{

while (1)

{

wgetchar=0;

if (choiceend==1)

{

printf("\n\nC:\\%s>",strupr(dirname));

}

else printf("Bad command or file name.\nC:\\%s>",strupr(username));

gets(choice);

strcpy(choice,ltrim(rtrim(strlwr(choice))));

if (strcmp(choice,"dir")==0) choice1=1;

else if(strcmp(choice,"create")==0) choice1=2;

else if(strcmp(choice,"delete")==0) choice1=3;

else if(strcmp(choice,"attrib")==0) choice1=4;

else if(strcmp(choice,"open")==0) choice1=5;

else if(strcmp(choice,"close")==0) choice1=6;

else if(strcmp(choice,"read")==0) choice1=7;

else if(strcmp(choice,"modify")==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;

else choice1=12;

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:choiceend=1;OpenF();if (!wgetchar) getchar();break;

case 6:choiceend=1;CloseF();if (!wgetchar) getchar();break;

case 7:choiceend=1;ReadF();if (!wgetchar) getchar();break;

case 8:choiceend=1;WriteF();if (!wgetchar) getchar();break;

case 9:printf("\nYou have exited this system.");

QuitF();exit(0);break;

case 10:choiceend=1;clrscr();break;

case 11:CdF();choiceend=1;break;

case 20:help();choiceend=1;break;

default:choiceend=0;

}

}

}

else printf("\nAccess denied.");

}

void help(void)

{

printf("\nThe Command List\n");

/*printf("\nCd Attrib Create Modify Read Open Cls Delete Exit Close\n");*/

printf("Create : Create a file(You can initialize file's attribute and content.)\n");

printf("Open : Open a file to modify\n");

printf("Close : Close a file.\n");

printf("Modify : Modify the opened file.\n");

printf("Delete : Delete existed files.\n");

printf("CD : Change current directory.\n");

printf("Exit : Exit this program.\n");

}

char *rtrim(char *str) /*remove the trailing blanks.*/

{

int n=strlen(str)-1;

while(n>=0)

{

if(*(str+n)!=' ')

{

*(str+n+1)='\0';

break;

}

else n--;

}

if (n<0) str[0]='\0';

return str;

}

char *ltrim(char *str) /*remove the heading blanks.*/

{

char *rtrim(char *str);

strrev(str);

rtrim(str);

strrev(str);

return str;

}

void LoginF() /*LOGIN FileSystem*/

{

char loginame[MAXNAME],loginpw[9],logincpw[9],str[50];

int i,j,flag=1;

char a[25];

int findout; /*login user not exist*/

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

void InputPW(char *password); /*input password,use '*' replace*/

void SetPANo(int RorW); /*Set physical address num*/

while(1)

{

findout=0;

printf("\n\nLogin Name:");

gets(loginame);

ltrim(rtrim(loginame));

fp_mfd=fopen("c:\\osfile\\mfd","rb");

for(i=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;i++)

if (strcmp(strupr(ufd_lp.ufdname),strupr(loginame))==0)

{

findout=1;

strcpy(logincpw,ufd_lp.ufdpword);

}

fclose(fp_mfd);

if (findout==1) /*user exist*/

{

printf("Login Password:");

InputPW(loginpw); /*input password,use '*' replace*/

if (strcmp(loginpw,logincpw)==0)

{

strcpy(username,strupr(loginame));

strcpy(dirname,username);

fp_mfd=fopen("c:\\osfile\\mfd","rb");

for(j=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;j++)

{

strcpy(str,"c:\\osfile\\");

strcat(str,ufd_lp.ufdname);

ufd[j]=(OSUFD*)malloc(sizeof(OSUFD));

strcpy(ufd[j]->ufdname,strupr(ufd_lp.ufdname));

fp_ufd=fopen(str,"rb");

fcount[j]=0;

for(i=0;fread(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd)!=0;i++,fcount[j]++)

{

ifopen[j][i].ifopen=0;

ifopen[j][i].openmode=4;

}

fclose(fp_ufd);

}

fclose(fp_mfd);

ucount=j;

SetPANo(0);

printf("\n\nLogin successful! Welcome to this FileSystem\n\n");

loginsuc=1;

return;

}

else

{

printf("\n\n");

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;}

}

}

}

else

{

printf("New Password(<=8):");

InputPW(loginpw); /*input new password,use '*' replace*/

printf("\nConfirm Password(<=8):"); /*input new password,use '*' replace*/

InputPW(logincpw);

if (strcmp(loginpw,logincpw)==0)

{

strcpy(ufd_lp.ufdname,strupr(loginame));

strcpy(ufd_lp.ufdpword,loginpw);

fp_mfd=fopen("c:\\osfile\\mfd","ab");

fwrite(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd);

fclose(fp_mfd);

strcpy(username,strupr(loginame));

strcpy(dirname,loginame);

strcpy(str,"c:\\osfile\\");

strcat(str,username);

if((fp_ufd=fopen(str,"rb"))==NULL)

{

fp_ufd=fopen(str,"wb");

fclose(fp_ufd);

}

fp_mfd=fopen("c:\\osfile\\mfd","rb");

for(j=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;j++)

{

strcpy(str,"c:\\osfile\\");

strcat(str,ufd_lp.ufdname);

ufd[j]=(OSUFD*)malloc(sizeof(OSUFD));

strcpy(ufd[j]->ufdname,strupr(ufd_lp.ufdname));

fp_ufd=fopen(str,"rb");

for(i=0;fread(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd)!=0;i++,fcount[j]++)

{

ifopen[j][i].ifopen=0;

ifopen[j][i].openmode=4;

}

fclose(fp_ufd);

}

fclose(fp_mfd);

ucount=j;

SetPANo(0);

printf("\n\nLogin Successful! Welcome to this System\n\n");

loginsuc=1;

return;

}

else

{

printf("\n\n");

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 SetPANo(int RorW) /*Set physical address num,0-read,1-write*/

{

int i,j;

if (RorW==0)

{

if((fp_file_p=fopen("c:\\osfile\\file\\file_p","rb"))==NULL)

{

fp_file_p=fopen("c:\\osfile\\file\\file_p","wb");

fclose(fp_file_p);

}

fp_file_p=fopen("c:\\osfile\\file\\file_p","rb");

for(i=0;fread(&j,sizeof(int),1,fp_file_p)!=0;i++)

fpaddrno[j]=1;

/*for(i=1;i

if ((i%13)==0) fpaddrno[i]=1;*/

}

else

{

fp_file_p=fopen("c:\\osfile\\file\\file_p","wb");

/*for(i=1;i

if((i%13)==0) fpaddrno[i]=0;*/

for(i=0;i

if (fpaddrno[i]==1)

fwrite(&i,sizeof(int),1,fp_file_p);

}

fclose(fp_file_p);

}

void InputPW(char *password) /*input password,use '*' replace*/

{

int j;

for(j=0;j<=7;j++)

{

password[j]=getch();

if ((int)(password[j])!=13)

{

if((int)(password[j])!=8)

putchar('*');

else

{

if (j>0)

{

j--;j--;

putchar('\b');putchar(' ');putchar('\b');

}

else j--;

}

}

else

{

password[j]='\0';

break;

}

}

password[j]='\0';

}

void DirF() /*Dir FileSystem*/

{

int i,j,count=0;

char sfmode[25],sfpaddr[25],str[25];

int ExistD(char *dirname); /*Whether DirName Exist,Exist-i,Not Exist-0*/

/*clrscr();*/

if (strcmp(strupr(ltrim(rtrim(dirname))),"")!=0)

{

printf("\n\nC:\\%s>dir\n",dirname);

printf("\n%14s%16s%14s%10s%18s\n","FileName","FileAddress","FileLength","Type","FileMode");

j=ExistD(dirname);

for(i=0;i

{

if ((i%16==0)&&(i!=0))

{

printf("\nPress any key to continue..");

getch();

/*clrscr();*/

printf("\n%14s%16s%14s%10s%18s\n","FileName","FileAddress","FileLength","Type","FileMode");

}

itoa(ufd[j]->ufdfile[i].fpaddr,str,10);

strcpy(sfpaddr,"file");

strcat(sfpaddr,str);

if (ufd[j]->ufdfile[i].fmode==0) strcpy(sfmode,"Read Only");

else if(ufd[j]->ufdfile[i].fmode==1) strcpy(sfmode,"Write Only");

else if(ufd[j]->ufdfile[i].fmode==2)strcpy(sfmode,"Read And Write");

else strcpy(sfmode,"Protect");

printf("%14s%16s%14d%10s%18s\n",ufd[j]->ufdfile[i].fname,sfpaddr,ufd[j]->ufdfile[i].flength,"",sfmode);

}

printf("\n %3d file(s)\n",fcount[j]);

}

else

{

printf("\n\nC:\\>dir\n");

printf("\n%14s%18s%8s\n","DirName","OwnFileCount","Type");

for(i=0;i

{

if ((i%16==0)&&(i!=0))

{

printf("\nPress any key to continue...");

getch();

/*clrscr();*/

printf("\n%14s%18s%8s\n","DirName","OwnFileCount","Type");

}

printf("%14s%18d%8s\n",ufd[i]->ufdname,fcount[i],"");

count=count+fcount[i];

}

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;i

if (strcmp(strupr(ufd[i]->ufdname),strupr(dirname))==0)

{

exist=1;

break;

}

if (exist) return(i);

else return(-1);

}

void CdF() /*Exchange Dir*/

{char dname[MAXNAME];

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistD(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

printf("\nPlease input DirName (cd..-Previous dir; DirNAME-cd [DirNAME]):");

gets(dname);

ltrim(rtrim(dname));

if (ExistD(dname)>=0) strcpy(dirname,strupr(dname));

else if(strcmp(strupr(dname),"CD..")==0) strcpy(ltrim(rtrim(dirname)),"");

else printf("\nError.\'%s\' does not exist.\n",dname);

}

void CreateF() /*Create File*/

{int fpaddrno,flag=1,i;

char fname[MAXNAME],str[50],str1[50],strtext[255],a[25];

char fmode[25];

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int FindPANo(); /*find out physical address num*/

int WriteF1(); /*write file*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(dirname),strupr(username))!=0)

{printf("\nError. You must create file in your own dir.\n");wgetchar=1;}

else

{

printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

if (ExistF(fname)>=0)

{printf("\nError. Name \'%s\' has already existed.\n",fname);

wgetchar=1;

}

else

{printf("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(ufd[i]->ufdfile[fcount[i]].fname,fname);

ufd[i]->ufdfile[fcount[i]].fpaddr=fpaddrno;

ufd[i]->ufdfile[fcount[i]].fmode=atoi(fmode);

ifopen[i][fcount[i]].ifopen=0;

ifopen[i][fcount[i]].openmode=4;

strcpy(str,"c:\\osfile\\file\\file");

itoa(fpaddrno,str1,10);

strcat(str,str1);

fp_file=fopen(str,"wb");

fclose(fp_file);

fcount[i]++;

while(flag)

{printf("Input text now(Y/N):");

gets(a);

ltrim(rtrim(a));

ufd[i]->ufdfile[fcount[i]-1].flength=0;

if(strcmp(strupr(a),"Y")==0)

{fp_file=fopen(str,"wb+");

ufd[i]->ufdfile[fcount[i]-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);

}

else

{printf("\nFail!No Disk Space. Please format your disk.\n");wgetchar=1;}

}

else {printf("\nError. FileMode\'s Range is 0-3\n");wgetchar=1;}

}}

}

int ExistF(char *filename) /*Whether FileName Exist,Exist-i,Not Exist-0*/

{int i,j;

int exist=0;

int ExistD(char *dirname);

j=ExistD(dirname);

for(i=0;i

if (strcmp(strupr(ufd[j]->ufdfile[i].fname),strupr(filename))==0)

{exist=1;

break;

}

if (exist) return(i);

else return(-1);

}

int FindPANo() /*find out physical address num*/

{int i;

for(i=0;i

if (fpaddrno[i]==0) {fpaddrno[i]=1;break;}

if (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);

if (c!='\n') length++;

}

fprintf(fp_file,"\n");

fclose(fp_file);

return(length);

}

void DeleteF() /*Delete File*/

{char fname[MAXNAME];

char str[50],str1[50];

int i,j,k,flag=1;

char a[25]; /*whether delete*/

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(dirname),strupr(username))!=0)

{printf("\nError. You can only delete file in your own dir.\n");wgetchar=1;}

else

{printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if (i>=0)

{k=ExistD(username);

if(ifopen[k][i].ifopen==1)

{printf("\nError. \'%s\' is in open status. Close it before delete.\n",fname);wgetchar=1;}

else

{

while(flag)

{printf("\'%s\' will be deleted. Are you sure(Y/N):",fname);

gets(a);

ltrim(rtrim(a));

if(strcmp(strupr(a),"Y")==0)

{fpaddrno[ufd[k]->ufdfile[i].fpaddr]=0;

itoa(ufd[k]->ufdfile[i].fpaddr,str,10);

for(j=i;j

{strcpy(ufd[k]->ufdfile[j].fname,ufd[k]->ufdfile[j+1].fname);

ufd[k]->ufdfile[j].fpaddr=ufd[k]->ufdfile[j+1].fpaddr;

ufd[k]->ufdfile[j].flength=ufd[k]->ufdfile[j+1].flength;

ufd[k]->ufdfile[j].fmode=ufd[k]->ufdfile[j+1].fmode;

ifopen[k][j]=ifopen[k][j+1];

}

fcount[k]--;

strcpy(str1,"c:\\osfile\\file\\file");

strcat(str1,str);

remove(str1);

flag=0;

printf("\n\'%s\' has been deleted successfully.\n",fname);

wgetchar=1;

}

else if(strcmp(strupr(a),"N")==0)

{printf("\nError. \'%s\' hasn\'t been deleted.\n",fname);

wgetchar=1;

flag=0;}

}}}

else

{printf("\nError. \'%s\' does not exist.\n",fname);wgetchar=1;}}

}

void ModifyFM() /*Modify FileMode*/

{char fname[MAXNAME],str[50];

int i,j,k,flag;

char fmode[25]; /*whether delete*/

char *rtrim(char *str); /*remove the trailing blanks.*/

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 ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(dirname),strupr(username))!=0) {printf("\nError.You can only modify filemode in yourself dir.\n");wgetchar=1;}

else

{ printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if (i>=0)

{k=ExistD(username);

if(ifopen[k][i].ifopen==1)

{printf("\nError.\'%s\' is in open status. Close it before modify.\n",fname);wgetchar=1;}

else

{

if(ufd[k]->ufdfile[i].fmode==0) strcpy(str,"read only"); /*FileMode*/

else if(ufd[k]->ufdfile[i].fmode==1) strcpy(str,"write only");

else if(ufd[k]->ufdfile[i].fmode==2) strcpy(str,"read and write");

else strcpy(str,"Protect");

printf("\'%s\' filemode is %s.\n",fname,strupr(str));

printf("Modify to(0-read only,1-write only,2-read and write,3-Protect):");

gets(fmode);

ltrim(rtrim(fmode));

if(strcmp(fmode,"0")==0)

{ufd[k]->ufdfile[i].fmode=0;

printf("\n\'%s\' has been modified to READ ONLY mode successfully.\n",fname);

wgetchar=1;

}

else if(strcmp(fmode,"1")==0)

{ufd[k]->ufdfile[i].fmode=1;

printf("\n\'%s\' has been modified to WRITE ONLY mode successfully.\n",fname);

wgetchar=1;

}

else if(strcmp(fmode,"2")==0)

{ufd[k]->ufdfile[i].fmode=2;

printf("\n\'%s\' has been modified to READ AND WRITE mode successfully.\n",fname);

wgetchar=1;

}

else if(strcmp(fmode,"3")==0)

{ufd[k]->ufdfile[i].fmode=3;

printf("\n\'%s\' has been modified to FORBID mode successfully.\n",fname);

wgetchar=1;

}

else {printf("\nError.\'%s\' is not modified.\n",fname);wgetchar=1;}

}

}

else

{printf("\nError. \'%s\' dose not exist.\n",fname);wgetchar=1;}}

}

void OpenF() /*Open File*/

{char fname[MAXNAME];

char str[25],str1[25],fmode[25];

int i,k;

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(ltrim(rtrim(dirname))),"")==0)

{printf("\nError. Please change to ufd dir before open.\n");wgetchar=1;return;}

printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if (i>=0)

{k=ExistD(dirname);

if(!ifopen[k][i].ifopen)

{if (ufd[k]->ufdfile[i].fmode==3)

{printf("\nError. The file\'s mode is FORBID. Can not open.\n");wgetchar=1;}

else

{printf("Please input FileOpenMode(0-Read Only,1-Write Only,2-Read and Write):");

gets(fmode);

ltrim(rtrim(fmode));

if((strcmp(fmode,"0")==0)||(strcmp(fmode,"1")==0)||(strcmp(fmode,"2")==0))

{if(fmode[0]=='0') /*open file with read only mode*/

{strcpy(str,"read only");

if((ufd[k]->ufdfile[i].fmode==0)||(ufd[k]->ufdfile[i].fmode==2)) ifopen[k][i].ifopen=1;

}

else if(fmode[0]=='1') /*open file with write only mode*/

{strcpy(str,"write only");

if((ufd[k]->ufdfile[i].fmode==1)||(ufd[k]->ufdfile[i].fmode==2)) ifopen[k][i].ifopen=1;

}

else if(fmode[0]=='2') /*open file with read and write mode*/

{strcpy(str,"read and write");

if(ufd[k]->ufdfile[i].fmode==2) ifopen[k][i].ifopen=1;

}

if(ufd[k]->ufdfile[i].fmode==0) strcpy(str1,"read only"); /*FileMode*/

else if(ufd[k]->ufdfile[i].fmode==1) strcpy(str1,"write only");

else if(ufd[k]->ufdfile[i].fmode==2) strcpy(str1,"read and write");

if(ifopen[k][i].ifopen==1)

{ifopen[k][i].openmode=atoi(fmode);

if (ifopen[k][i].openmode==0) strcpy(str,"read only");

else if(ifopen[k][i].openmode==1) strcpy(str,"write only");

else if(ifopen[k][i].openmode==2) strcpy(str,"read and write");

printf("\n\'%s\' has been opened. OpenMode is %s,FileMode is %s\n",fname,strupr(str),strupr(str1));

wgetchar=1;

}

else

{printf("\nError. \'%s\' hasn\'t been opened. OpenMode Error. OpenMode is %s,but FileMode is %s\n",fname,strupr(str),strupr(str1));wgetchar=1;}

}

else {printf("\nError. FileOpenMode\'s Range is 0-2\n");wgetchar=1;}

}}

else {printf("\nError. \'%s\' is in open status.\n",fname);wgetchar=1;}

}

else

{printf("\nError. \'%s\' does not exist.\n",fname);wgetchar=1;}

}

void CloseF() /*Close File*/

{int i,k,n=0;

char fname[MAXNAME];

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(ltrim(rtrim(dirname))),"")==0)

{printf("\nError. Please convert to ufd dir before close.\n");wgetchar=1;return;}

k=ExistD(dirname);

printf("\nOpen File(s) In This Ufd:\n");/*display openned file*/

for(i=0;i

{if (ifopen[k][i].ifopen==1) {printf("%15s",ufd[k]->ufdfile[i].fname);n++;}

if((n%4==0)&&(n!=0)) printf("\n");

}

printf("\n%d files openned.\n",n);

if (n==0) wgetchar=1;

if(n!=0)

{printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if(i>=0)

{if(ifopen[k][i].ifopen==1)

{ifopen[k][i].ifopen=0;

ifopen[k][i].openmode=4;

printf("\n\'%s\' has been closed successfully.\n",fname);

wgetchar=1;

}

else {printf("\nError.\'%s\' is in closing status.\n",fname);wgetchar=1;}

}

else {printf("\nError. \'%s\' is not exist.\n",fname);wgetchar=1;}

}

}

void ReadF() /*Read File*/

{int i,k,n=0;

char fname[MAXNAME];

char str[255],str1[255],c;

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

if (strcmp(strupr(ltrim(rtrim(dirname))),"")==0) {printf("\nError.Please convert to ufd dir before read.\n");wgetchar=1;return;}

printf("\nCaution:Open file first\n");

printf("Opened File(s) List:\n");

k=ExistD(dirname);

for(i=0;i

{if (ifopen[k][i].ifopen==1)

if ((ifopen[k][i].openmode==0) ||(ifopen[k][i].openmode==2)) {printf("%15s",ufd[k]->ufdfile[i].fname);n++;}

if((n%4==0)&&(n!=0)) printf("\n");

}

printf("\n%d files openned.\n",n);

if (n==0) wgetchar=1;

if(n!=0)

{printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if(i>=0)

{if(ifopen[k][i].ifopen==1)

{if((ifopen[k][i].openmode==0) ||(ifopen[k][i].openmode==2))

{itoa(ufd[k]->ufdfile[i].fpaddr,str,10);

strcpy(str1,"file");

strcat(str1,str);

strcpy(str,"c:\\osfile\\file\\");

strcat(str,str1);

fp_file=fopen(str,"rb");

fseek(fp_file,0,0);

printf("\nThe text is:\n\n");

printf(" ");

while(fscanf(fp_file,"%c",&c)!=EOF)

if (c=='\n') printf("\n ");

else printf("%c",c);

printf("\n\n%d Length.\n",ufd[k]->ufdfile[i].flength);

fclose(fp_file);

wgetchar=1;

}

else

{printf("\nError.\'%s\' has been opened with WRITE ONLY mode. It isn\'t read.\n",fname);wgetchar=1;}

}

else {printf("\nError.\'%s\' is in closing status. Please open it before read\n",fname);wgetchar=1;}

}

else {printf("\nError. \'%s\' does not exist.\n",fname);wgetchar=1;}

}

}

void WriteF() /*Write File*/

{int i,k,n=0;

char fname[MAXNAME];

char str[50],str1[50],a[50];

char *rtrim(char *str); /*remove the trailing blanks.*/

char *ltrim(char *str); /*remove the heading blanks.*/

int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/

int ExistD(char *dirname);

int WriteF1(); /*write file*/

if (strcmp(strupr(ltrim(rtrim(dirname))),"")==0) {printf("\nError. Please convert to ufd dir before write.\n");wgetchar=1;return;}

k=ExistD(dirname);

printf("\nOpen File(s) with write only mode or read and write mode:\n");/*display openned files with writable mode*/

for(i=0;i

{if (ifopen[k][i].ifopen==1)

if ((ifopen[k][i].openmode==1) ||(ifopen[k][i].openmode==2)) {printf("%15s",ufd[k]->ufdfile[i].fname);n++;}

if((n%4==0)&&(n!=0)) printf("\n");

}

printf("\n%d files open.\n",n);

if (n==0) wgetchar=1;

if(n!=0)

{printf("\nPlease input FileName:");

gets(fname);

ltrim(rtrim(fname));

i=ExistF(fname);

if(i>=0)

{if(ifopen[k][i].ifopen==1)

{if((ifopen[k][i].openmode==1) ||(ifopen[k][i].openmode==2))

{itoa(ufd[k]->ufdfile[i].fpaddr,str,10);

strcpy(str1,"file");

strcat(str1,str);

strcpy(str,"c:\\osfile\\file\\");

strcat(str,str1);

if (ufd[k]->ufdfile[i].flength!=0)

{printf("\n\'%s\' has text. Overwrite or Append(O-overwrite,A-Append,else-not write):",fname);

gets(a);

ltrim(rtrim(a));

if (fp_file!=NULL) fclose(fp_file);

if (strcmp(strupr(a),"O")==0)

{printf("\nOverwrite\n");

fp_file=fopen(str,"wb");

ufd[k]->ufdfile[i].flength=0;

ufd[k]->ufdfile[i].flength=WriteF1();

}

else if(strcmp(strupr(a),"A")==0)

{printf("\nAppend\n");

fp_file=fopen(str,"ab");

ufd[k]->ufdfile[i].flength=ufd[k]->ufdfile[i].flength+WriteF1();

}

else

{printf("\nError.\'%s\' has not been written.\n",fname);

fclose(fp_file);

wgetchar=1;

}

}

else

{fp_file=fopen(str,"wb");

ufd[k]->ufdfile[i].flength=WriteF1();

}

}

else

{printf("\nError. \'%s\' has been opened with read only mode.It isn\'t writed.\n",fname);wgetchar=1;}

}

else

{printf("\nError. \'%s\' is in closing status. Please open it before write\n",fname);wgetchar=1;}

}

else

{printf("\nError. \'%s\' does not exist.\n",fname);wgetchar=1;}

}

}

void QuitF() /*Quit FileSystem*/

{int i,j;

char str[50];

void SetPANo(int RorW); /*Set physical address num,0-read,1-write*/

SetPANo(1);

if (fp_mfd!=NULL) fclose(fp_mfd);

if (fp_ufd!=NULL) fclose(fp_ufd);

if (fp_file!=NULL) fclose(fp_file);

for(j=0;j

{strcpy(str,"c:\\osfile\\");

strcat(str,ufd[j]->ufdname);

ltrim(rtrim(str));

fp_ufd=fopen(str,"wb");

fclose(fp_ufd);

fp_ufd=fopen(str,"ab");

for(i=0;i

fwrite(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd);

fclose(fp_ufd);}

}

操作系统实验6