-
Notifications
You must be signed in to change notification settings - Fork 0
/
os2.cpp
766 lines (698 loc) · 15.8 KB
/
os2.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
#include <iostream>
#include <list>
#include <string>
using namespace std;
#define NADDR 3
#define PWOSIZ 32
#define NICFREE 10
#define NICINOD 10
#define DIRNUM 8
#define NOFILE 10
struct inode;
//目录索引节点
struct direct
{
string d_name; /*目录名*/
inode* pointer; /*目录号*/
};
struct dir
{
struct direct directory[DIRNUM];
int size;
};
//块描述符
struct inode{
struct inode *i_forw = NULL;
struct inode *i_back = NULL;
bool I_flag;
unsigned long i_into; /*磁盘i节点标号*/
unsigned int di_number; /*关联文件书,当为0时,则删除该文件*/
unsigned int di_mode; /*存取权限*/
unsigned int di_uid; /*磁盘i节点用户*/
unsigned int di_gid; /*磁盘i节点组*/
//unsigned int di_addr[NADDR]; /*物理块号*/
bool isDir;
dir* directory;
char data[100];
unsigned int i_size;
inode(long into,int uid,int gid,int mode){
i_into = into;
i_forw = NULL;
i_back = NULL;
i_size = 0;
di_uid = uid;
di_gid = gid;
di_mode = mode;
}
};
struct pwd
{
unsigned int P_uid;
unsigned int P_gid;
char passward[PWOSIZ];
};
struct hinode
{
struct inode *iforw;
};
struct file
{
char f_flag; /*文件操作标志*/
unsigned int f_count; /*引用计数*/
struct inode *f_inode; /*指向内存节点*/
unsigned long f_off; /*读/写指针*/
};
class user
{
private:
string user_name;
string pwd;
bool active;
unsigned int u_default_mode;
unsigned int u_uid; /*用户标志*/
unsigned int u_gid; /*用户组标志*/
unsigned int u_ofile[NOFILE]; /*用户打开表*/
string cur_postion;
public:
user(string name, string pw, short uid, short gid, short mode)
{
user_name = name;
pwd = pw;
u_default_mode = mode;
u_uid = uid;
u_gid = gid;
active = false;
}
string getName(){ return user_name; }
int getUsrid(){ return u_uid; }
int gerGrpid(){ return u_gid; }
bool login_account(string password)
{
if (pwd == password)
{
active = true;
return true;
}
else{
return false;
}
}
void setActive(bool act){
active = act;
}
//~user();
};
class filsys
{
private:
//unsigned int s_isize; /*i节点块块数*/
//unsigned long s_fsize; /*数据块块数*/
//unsigned int s_nfree; /*空闲块块数*/
//unsigned int s_pfree; /*空闲块指针*/
//unsigned int s_free[NICFREE]; /*空闲块堆栈*/
unsigned long s_ninode; /*空闲i节点数*/
list<inode*>::iterator s_pinode; /*空闲i节点指针*/
list<inode*> inode_list;
unsigned int s_inode[NICINOD]; /*空闲i节点数组*/
unsigned int s_rinode; /*铭记i节点*/
char s_fmod; /*超级块修改标志*/
inode* cur_positon;
public:
filsys(){
s_ninode = 0;
//s_pinode = 0;
cur_positon = 0;
}
bool initial(long size,int uid,int gid,int mode){
s_ninode = size;
for (int i = 0; i < size; i++){
inode_list.push_back(new inode(i,uid,gid,mode));
}
inode* root_dir=inode_list.front();
root_dir->directory = new dir;
root_dir->directory->size = 0;
root_dir->isDir = true;
s_ninode = size - 1;
cur_positon = root_dir;
list<inode*>::iterator temp =inode_list.begin();
s_pinode = ++temp;
return true;
}
inode* firstFreeInode(){
if (s_ninode > 0){
return *s_pinode;
}
else {
cout << "The disk is full!" << endl;
return NULL;
}
}
void refresh_pinode(){
if (s_ninode > 0)
{
int i = s_ninode;
list<inode*>::iterator temp = s_pinode;
(*temp)->I_flag = true;
while ((*temp)->I_flag == true && i > 0){
temp++;
i--;
}
s_pinode = temp;
s_ninode--;
}
}
void retrieveInode(inode* node){
if (*s_pinode > node){
while ((*s_pinode) != node)
s_pinode--;
s_ninode++;
}
else{
s_ninode++;
}
}
void mkdir(string dir_name){
if (cur_positon->isDir){
int& addpoint = cur_positon->directory->size;
if (addpoint == DIRNUM) cout << "The directory is full!" << endl;
else{
cur_positon->directory->directory[addpoint].d_name = dir_name;
inode* temp=firstFreeInode();
if (temp){
temp->isDir = true;
temp->i_forw = cur_positon;
temp->I_flag = true;
temp->directory = new dir;
temp->directory->size = 0;
cur_positon->directory->directory[addpoint].pointer = temp;
addpoint++;
refresh_pinode();
}
else cout << "Can not creat a directory!" << endl;
}
}
else cout << "Can not creat a directory!" << endl;
}
void cd(string dir_name){
if (cur_positon->isDir){
direct* temp;
int i = 0;
for (i = 0; i<cur_positon->directory->size; ){
temp =&( cur_positon->directory->directory[i]);
if (temp->d_name == dir_name)
{
cur_positon = temp->pointer;
return;
}
else if (temp->pointer != NULL){ i++; }
}
if (i == cur_positon->directory->size)
cout << "Can not find " << dir_name << endl;
else cout << "current position: " << dir_name << endl;
}
else{
cout << "Failed!" << endl;
}
}
void chdir(){
if (cur_positon != inode_list.front()){
cur_positon = cur_positon->i_forw;
}
}
void showDir(){
if (cur_positon->isDir){
int i = 0;
direct temp;
for (i = 0; i < DIRNUM; i++){
temp = cur_positon->directory->directory[i];
if (temp.d_name=="") continue;
if (temp.pointer->isDir)
{
cout << "directory " << temp.pointer->di_uid << " " << temp.pointer->di_gid << " " << temp.d_name << endl;
}
else {
cout << "file " << temp.pointer->di_uid << " " << temp.pointer->di_gid << " " << temp.d_name << endl;
}
}
if (i == 0) cout << "The directory is empty!";
}
else cout << "This is not a directory!";
}
void creatFile(string file_name,int size){
if (cur_positon->isDir && s_ninode > size){
int& addpoint = cur_positon->directory->size;
if (addpoint == DIRNUM) cout << "The directory is full!" << endl;
else{
cur_positon->directory->directory[addpoint].d_name = file_name;
inode* temp = firstFreeInode();
if (temp){
temp->isDir = false;
//cur_positon->i_back = temp;
temp->i_forw = cur_positon;
temp->I_flag = true;
temp->data[0] = '\0';
cur_positon->directory->directory[addpoint].pointer = temp;
addpoint++;
refresh_pinode();
size--;
for (size; size > 0; size--){
temp->i_back = firstFreeInode();
temp->isDir = false;
temp->i_forw->i_forw = cur_positon;
temp->I_flag = true;
temp->i_back->data[0] = '\0';
refresh_pinode();
temp = temp->i_back;
}
}
else cout << "Can not creat a file!" << endl;
}
}
else cout << "Can not creat a file!" << endl;
}
void closeFile(){
cur_positon = cur_positon->i_forw;
}
void extendFile(inode* filenode){
if (s_ninode > 0){
filenode->i_back = firstFreeInode();
filenode->i_back->isDir = false;
filenode->i_back->i_forw = filenode->i_forw;
filenode->i_back->I_flag = true;
filenode->i_back->data[0] = '\0';
refresh_pinode();
}
else{ cout << "Disk is full!" << endl; }
}
void editFile(inode* node){
inode* filenode = node;
cout << endl;
string context;
cin >> context;
int count = context.size() / 100 ;
for (int i = 0; i < count+1; i++)
{
for (int k = 0; k < 100; k++){
if (100 * i + k<context.size()){
filenode->data[k] = context.at(100 * i + k);
filenode->i_size++;
}
else{
filenode->data[k] = '\0';
break;
}
}
if (filenode->i_back != NULL) filenode = filenode->i_back;
else{
extendFile(filenode);
filenode = filenode->i_back;
}
}
}
void printFileContext(inode* filenode){
inode* temp = filenode;
while (temp){
cout << temp->data;
temp = temp->i_back;
}
}
void appendFileContext(inode* filenode){
inode* temp = filenode;
cout << endl;
string context;
cin >> context;
int num = context.size();
for (int i = 0; i < num; ){
if (temp->i_size < 100){
temp->data[temp->i_size++] = context.at(i);
i++;
}
else if (temp->i_back != NULL){
temp = temp->i_back;
}
else{
extendFile(temp);
temp = temp->i_back;
}
}
if (temp->i_size<100) temp->data[temp->i_size++] ='\0';
}
void fileOpMenu(inode* filenode)
{
bool flag = true;
while (flag)
{
cout << endl << "choose one of the actions below:(1 to 4)" << endl;
int i = 0;
i++;
cout << i << ".\t" << "correct content" << endl;
i++;
cout << i << ".\t" << "show content" << endl;
i++;
cout << i << ".\t" << "add content" << endl;
i++;
cout << i << ".\t" << "exit file" << endl;
int select;
cin >> select;
switch (select)
{
case 1:
editFile(filenode);
break;
case 2:
printFileContext(filenode);
break;
case 3:
appendFileContext(filenode);
break;
case 4:
flag = false;
cur_positon = cur_positon->i_forw;
break;
default:
break;
}
}
}
inode* findFileorDir(string name){
if (cur_positon->isDir){
direct* temp;
int i = 0;
int num = cur_positon->directory->size;
for (i; i < DIRNUM;i++){
temp = &(cur_positon->directory->directory[i]);
if (temp->d_name == name){
return temp->pointer;
}
/*else if (temp->pointer != NULL){
i++;
}*/
}
}
else return NULL;
}
void delFileorDirinDir(string name){
if (cur_positon->isDir){
direct* temp;
int i = 0;
int num = cur_positon->directory->size;
for (i; i < DIRNUM;i++){
temp = &(cur_positon->directory->directory[i]);
if (temp->d_name == name){
cur_positon->directory->directory[i].d_name = "";
cur_positon->directory->directory[i].pointer = NULL;
cur_positon->directory->size--;
return;
}
/*else if (temp->pointer != NULL){
}*/
}
}
else return;
}
void openFile(string file_name){
if (cur_positon->isDir){
direct* temp;
int i = 0;
int num = cur_positon->directory->size;
for (i = 0; i<DIRNUM;i++){
temp = &(cur_positon->directory->directory[i]);
if (temp->d_name == file_name){
cur_positon = temp->pointer;
fileOpMenu(cur_positon);
return;
}
//else if (temp->pointer != NULL){ i++; }
}
if (i == cur_positon->directory->size-1)
cout << "Can not find " << file_name << endl;
else cout << "current position: " << file_name << endl;
}
else{
cout << "Failed!" << endl;
}
}
void deleteFile(){
cout << endl << "input file name:";
string fname;
cin >> fname;
inode* fnode=findFileorDir(fname);
if (fnode){
while (fnode){
fnode->data[0] = '\0';
fnode->I_flag = false;
fnode->i_forw = NULL;
inode* temp = fnode->i_back;
fnode->i_back = NULL;
fnode->i_size = 0;
retrieveInode(fnode);
fnode = temp;
delFileorDirinDir(fname);
}
}
else{
cout <<endl<< fname << " can not found." << endl;
}
}
void deleteDir(){
cout << endl << "input directory name:";
string dname;
cin >> dname;
inode* fnode = findFileorDir(dname);
if (fnode && fnode->di_number!=0){
delete fnode->directory;
fnode->isDir = false;
fnode->i_back = NULL;
fnode->I_flag = false;
delFileorDirinDir(dname);
}
else{
cout << "failed" << endl;
}
}
};
struct dinode
{
unsigned int di_number; /*关联文件数*/
unsigned int di_mode; /*存取权限*/
unsigned int di_uid;
unsigned int di_gid;
unsigned long di_size; /*文件大小*/
unsigned int di_addr[NADDR]; /*物理块号*/
};
class disk:public filsys
{
private:
dinode disk_discription;
bool raw;
public:
disk(long size, int uid, int gid, int mode) :filsys()
{
disk_discription.di_size = size;
disk_discription.di_number = 0;
disk_discription.di_uid = uid;
disk_discription.di_gid = gid;
disk_discription.di_mode = mode;
raw = true;
}
void creatFileSystem(){
initial(disk_discription.di_size,disk_discription.di_uid,disk_discription.di_gid,disk_discription.di_mode);
raw = false;
}
int getUid(){ return disk_discription.di_uid; }
bool getRaw(){ return raw; }
};
class sys_process
{
private:
int user_num;
int group_num;
list<user*> user_list;
int disk_num;
list<disk*> disk_list;
public:
sys_process()
{
user_num = 0;
group_num = 0;
}
//~sys_process();
user* creatUser(string name,string pwd,short mode=0)
{
user_num++;
group_num++;
user* temp = new user(name, pwd, user_num, group_num, mode);
user_list.push_back(temp);
return temp;
}
user* findUser(string name)
{
list<user*>::iterator temp;
for (temp = user_list.begin(); temp != user_list.end();temp++)
{
if ( (*temp)->getName() == name) return *temp;
}
if (temp == user_list.end()) return NULL;
return NULL;
}
disk* creatDisk(long size,user usr,int mode=0){
disk_num++;
disk* temp = new disk(size, usr.getUsrid(), usr.gerGrpid(), mode);
disk_list.push_back(temp);
return temp;
}
disk* findDisk(user* usr)
{
list<disk*>::iterator temp;
for (temp = disk_list.begin(); temp != disk_list.end(); temp++)
{
if ((*temp)->getUid() == usr->getUsrid()) return *temp;
}
if (temp == disk_list.end()) return NULL;
return NULL;
}
void menu(user* usr)
{
disk* di = findDisk(usr);
if (di == NULL){
cout << "no disk found!you have to creat a new partition!" << endl;
cout << "input disk size:";
long size;
cin >> size;
di=creatDisk(size, *usr);
}
bool flag = true;
while (flag)
{
cout << endl<<"choose one of the actions below:(1 to 11)" << endl;
int i = 0;
i++;
cout << i << ".\t" << "create dir" << endl;
i++;
cout << i << ".\t" << "entry dir" << endl;
i++;
cout << i << ".\t" << "return" << endl;
i++;
cout << i << ".\t" << "show file" << endl;
i++;
cout << i << ".\t" << "create file" << endl;
i++;
cout << i << ".\t" << "open file" << endl;
i++;
cout << i << ".\t" << "delete file" << endl;
i++;
cout << i << ".\t" << "delete dir" << endl;
i++;
cout << i << ".\t" << "create system file" << endl;
i++;
cout << i << ".\t" << "create disk partition" << endl;
i++;
cout << i << ".\t" << "log out" << endl;
int select;
string name;
cin >> select;
if (di->getRaw() && select!=9){
cout << "The disk is raw,you have to creat a filesystem first!" << endl;
continue;
}
switch (select)
{
case 1:
cout << endl << "input directory name:";
cin >> name;
di->mkdir(name);
break;
case 2:
cout << endl << "input directory name:";
cin >> name;
di->cd(name);
break;
case 3:
di->chdir();
break;
case 4:
di->showDir();
break;
case 5:
cout << endl << "input file name:";
cin >> name;
di->creatFile(name, 2);
break;
case 6:
cout << endl<<"input file name:";
cin >> name;
di->openFile(name);
break;
case 7:
di->deleteFile();
break;
case 8:
di->deleteDir();
break;
case 9:
cout << endl << "creat filesysytem" << endl;
di->creatFileSystem();
break;
case 10:
cout << endl << "input disk size:";
long size;
cin >> size;
di = creatDisk(size, *usr);
break;
case 11:
usr->setActive(false);
flag = false;
break;
default:
select = 0;
break;
}
}
}
void daemon()
{
string log_name, log_pwd;
cout << "login:";
cin >> log_name;
cout << endl;
user* login=findUser(log_name);
if (login==NULL)
{
cout << log_name << " is not exist,do you want to creat an user with this name?(Y or N)" << endl;
char c;
cin >> c;
if (c == 'y' || c == 'Y')
{
cout << "Please input password:";
cin >> log_pwd;
cout << "mode:(0 or 1)";
int mode = 0;
cin >> mode;
login=creatUser(log_name, log_pwd, mode);
}
}
else
{
while (1){
cout << "password:";
cin >> log_pwd;
if (log_pwd == "exit") break;
else if (login->login_account(log_pwd)){
cout << "Welcome, " << log_name << endl;
login->setActive(true);
break;
}
else{
cout << "password failed!" << endl;
}
}
}
menu(login);
}
};
int main()
{
sys_process sys;
sys.daemon();
return 0;
}