操作系统实验文件管理C++代码

1、#include using namespace std;#define BLKSIZE 512.n);printf(WARNING:ALL DATA ON THIS FILESYSTEM WILL BE LOST!n);printf(Proceed with Format(Y/N);scanf(%c, &choice);getchar();if(choice = y) | (choice = Y)if(fp=fopen(image_name, w+b) = NULL)printf(Cant create file %sn, image_name);exit(-1);for(i = 0; i

2、BLKSIZE; i+)fputc(0, fp);= 0;strcpy, /);= d;strcpy, /);= 0;= 0;0 = -1;1 = -1;fwrite(&inode, sizeof(Inode), 1, fp);= -1;for(i = 0; i 31; i+)fwrite(&inode, sizeof(Inode), 1, fp);for(i = 0; i 512)add1 = inode_arraynum.address1;if(fp = fopen(image_name, r+b) = NULL)printf(Cant open file %s.n, image_name

3、);exit(-1);fseek(fp, BLKSIZE+INODESIZE*INODENUM +add0*BLKSIZE, SEEK_SET);ch = fgetc(fp);for(i=0; (i len) & (ch != 0) & (i = 512)fseek(fp,BLKSIZE+INODESIZE*INODENUM+add1*BLKSIZE,SEEK_SET);ch = fgetc(fp);for(; (i len) & (ch != 0); i+)tempi = ch;ch = fgetc(fp);tempi = 0;fclose(fp);ddress0;len = inode_a

4、rraynum.length;if(fp = fopen(image_name, r+b) = NULL)printf(Cant open file %s.n, image_name);exit(-1);fseek(fp, BLKSIZE+INODESIZE*INODENUM+add0*BLKSIZE, SEEK_SET);for(i=0; (ilen)&(tempi!=0)&(i 512); i+)fputc(tempi, fp);if(i = 512)add1 = inode_arraynum.address1;fseek(fp,BLKSIZE+INODESIZE*INODENUM+add

5、1*BLKSIZE,strcat(path,inode_arrayn.file_name);SEEK_SET);for(; (i len) & (tempi != 0); i+)fputc(tempi, fp);fputc(0, fp);fclose(fp);num = 0)strcpy(path,;elsestrcpy(path,;m=0;n=inum_cur;while(m != inum_cur)while(inode_arrayn.iparent != m)n = inode_arrayn.iparent;strcat(path,/);m = n;n = inum_cur;printf

6、(%s$,path);或者 cd dir1)void cd(void)int i;if(argc != 2)printf(Command cd must have two args. n);return ;if(!strcmp(argv1, .)inum_cur = inode_arrayinum_cur.iparent;elsefor(i = 0; i 0)&(inode_arrayi.type=d)&(inode_arrayi.iparent=inum_cur)&!strcmp(inode_arrayi.file_name,argv1)&!strcmp(inode_arrayi.user_

7、name,)break;if(i = INODENUM)printf(This directory isnt exsited.n);elseinum_cur = i;n);return ;num 0) &(inode_arrayi.iparent = inum_cur)&!strcmp(inode_arrayi.user_name,)if(inode_arrayi.type = d)dcount+;printf(%-20sn,inode_arrayi.file_name);elsefcount+;bcount+=inode_arrayi.length;printf(%-20s%12dbytes

8、n,inode_arrayi.file_name,inode_arrayi.length);printf(n%d file(s)%11dbytesn,fcount,bcount);printf(%d dir(s) %11d bytesFreeSpacen,dcount,1024*1024-bcount);n);return ;num 0) break;if(i = INODENUM)printf(Inode is full.n);exit(-1);inode_arrayi.inum = i;strcpy(inode_arrayi.file_name, argv1);inode_arrayi.t

9、ype = d;strcpy(inode_arrayi.user_name,;inode_arrayi.iparent = inum_cur;inode_arrayi.length = 0;save_inode(i);n);return ;for(i = 0; i 0) &(inode_arrayi.type = f) &!strcmp(inode_arrayi.file_name, argv1)printf(This file is exsit.n);return ;if(i = FILENUM)(inode_arrayi.type = f) &for(i = 0; i INODENUM;

10、i+)if(inode_arrayi.inum 0) break;if(i = INODENUM)printf(Inode is full.n);exit(-1);inode_arrayi.inum = i;strcpy(inode_arrayi.file_name, argv1);inode_arrayi.type = f;strcpy(inode_arrayi.user_name, ;inode_arrayi.iparent = inum_cur;inode_arrayi.length = 0;save_inode(i);n);return ;for(i = 0; i 0) &!strcm

11、p(inode_arrayi.file_name,argv1)&!strcmp(inode_arrayi.user_name,)break;if(i = INODENUM)printf(The file you want to open doesnt exsited.n);return ;inum = i;printf(Please input open mode:(1: read, 2: write, 3: read and write):);scanf(%d, &mode);getchar();if(mode 3)printf(Open mode is wrong.n);return;fo

12、r(i = 0; i FILENUM; i+)if(file_arrayi.inum 0) break;printf(The file table is full, please close some file.n);return ;filenum = i;file_arrayfilenum.inum = inum;strcpy(file_arrayfilenum.file_name,inode_arrayinum.file_name);file_arrayfilenum.mode = mode;printf(Open file %s by , file_arrayfilenum.file_n

13、ame);if(mode = 1) printf(read only.n);else if(mode = 2) printf(write only.n);else printf(read and write.n);n);return;for(i = 0; i 0) &!strcmp(file_arrayi.file_name,argv1) break;for(i = 0; i 0)read_blk(inum);for(i = 0; (i 0)&!strcmp(file_arrayi.file_name,argv1) break;if(i = FILENUM)printf(Open %s fir

14、st.n, argv1);return ;else if(file_arrayi.mode = 1)printf(Cant write %s.n, argv1);return ;inum = file_arrayi.inum;printf(The length of %s:%dn, inode_arrayinum.file_name, inode_arrayinum.length);if(inode_arrayinum.length = 0)i=0;inode_arrayinum.address0 = get_blknum();printf(Input the data(CTRL+Z to e

15、nd):n);while(i 512)inode_arrayinum.address1 = get_blknum();save_inode(inum);write_blk(inum);elseprintf(This file cant be written.n);n);return ;for(i = 0; i 0) &!strcmp(file_arrayi.file_name, argv1) break;if(i = FILENUM)printf(This file doesnt be opened.n);return ;elsefile_arrayi.inum = -1;printf(Clo

16、se %s success!n, argv1);num = -1;if(inode_arrayi.length 0)release_blk(inode_arrayi.address0);if(inode_arrayi.length = 512)release_blk(inode_arrayi.address1);save_inode(i);n);return ;int n,t,i;stack istk;for(i = 0; i =0) &(inode_arrayi.iparent = inum_cur)&(!strcmp(inode_arrayi.file_name,argv1)&(!strc

17、mp(inode_arrayi.user_name,)n=inode_arrayi.inum;break;if(i=INODENUM) puts(Directory ERROR);else(n);while(!()t=();();del(t);for(i = 0; i =0)&(inode_arrayi.iparent = t)(i);/ 功能 : 退出当前用户 (logout)/ 功能 : 显示错误void logout()printf(Do you want to exit this user(y/n);scanf(%c, &choice);getchar();if(choice = y)

18、 | (choice = Y)printf(nCurrent user has exited!n);login();return ;/ 功能 : 退出文件系统 (quit)void quit()printf(Do you want to exist(y/n):);scanf(%c, &choice);getchar();if(choice = y) | (choice = Y)exit(0);void errcmd()printf(Command Error!n);/ 清空内存中存在的用户名void free_user()int i;for(i=0;i10;i+)i=0;/功能 : 循环执行用户输入的命令, 直到 logout/help, cd, dir, mkdir, creat, open,read,write,close, delete, logout, clear, format,quit void command(void)char cmd100;system(cls);dopathset();gets(cmd);switch(analyse(cmd)case 0:help(); break;cd(); break;dir