Commit | Line | Data |
---|---|---|
3a54d117 BJ |
1 | /* |
2 | * Print working (current) directory | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <sys/param.h> | |
6 | #include <sys/stat.h> | |
7 | #include <sys/dir.h> | |
8 | ||
9 | char dot[] = "."; | |
10 | char dotdot[] = ".."; | |
11 | char name[BUFSIZ]; | |
12 | int file; | |
13 | int off = -1; | |
14 | struct stat d, dd; | |
15 | struct direct dir; | |
16 | ||
17 | main() | |
18 | { | |
19 | int rdev, rino; | |
20 | ||
21 | stat("/", &d); | |
22 | rdev = d.st_dev; | |
23 | rino = d.st_ino; | |
24 | for (;;) { | |
25 | stat(dot, &d); | |
26 | if (d.st_ino==rino && d.st_dev==rdev) | |
27 | prname(); | |
28 | if ((file = open(dotdot,0)) < 0) { | |
29 | fprintf(stderr,"pwd: cannot open ..\n"); | |
30 | exit(1); | |
31 | } | |
32 | fstat(file, &dd); | |
33 | chdir(dotdot); | |
34 | if(d.st_dev == dd.st_dev) { | |
35 | if(d.st_ino == dd.st_ino) | |
36 | prname(); | |
37 | do | |
38 | if (read(file, (char *)&dir, sizeof(dir)) < sizeof(dir)) { | |
39 | fprintf(stderr,"read error in ..\n"); | |
40 | exit(1); | |
41 | } | |
42 | while (dir.d_ino != d.st_ino); | |
43 | } | |
44 | else do { | |
45 | if(read(file, (char *)&dir, sizeof(dir)) < sizeof(dir)) { | |
46 | fprintf(stderr,"read error in ..\n"); | |
47 | exit(1); | |
48 | } | |
49 | stat(dir.d_name, &dd); | |
50 | } while(dd.st_ino != d.st_ino || dd.st_dev != d.st_dev); | |
51 | close(file); | |
52 | cat(); | |
53 | } | |
54 | } | |
55 | ||
56 | prname() | |
57 | { | |
58 | write(1, "/", 1); | |
59 | if (off<0) | |
60 | off = 0; | |
61 | name[off] = '\n'; | |
62 | write(1, name, off+1); | |
63 | exit(0); | |
64 | } | |
65 | ||
66 | cat() | |
67 | { | |
68 | register i, j; | |
69 | ||
70 | i = -1; | |
71 | while (dir.d_name[++i] != 0); | |
72 | if ((off+i+2) > BUFSIZ-1) | |
73 | prname(); | |
74 | for(j=off+1; j>=0; --j) | |
75 | name[j+i+1] = name[j]; | |
76 | off=i+off+1; | |
77 | name[i] = '/'; | |
78 | for(--i; i>=0; --i) | |
79 | name[i] = dir.d_name[i]; | |
80 | } |