ed3a7f09 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | #include <errno.h> |
4 | #include <string.h> |
5 | #include <pwd.h> |
6 | |
7 | #include <sys/types.h> |
8 | #include <sys/stat.h> |
9 | |
10 | int main(int argc, char *argv[]) { |
11 | |
12 | struct stat file_stat; |
13 | struct passwd *file_pd; |
14 | |
15 | int argc_decr; |
16 | mode_t *ft; |
17 | |
18 | extern int errno; |
19 | |
20 | argc_decr = argc; /* K&R 117(ยง5.10) warns against decrementing argc directly */ |
21 | |
22 | if(argc <= 1 || argc >= 5) { |
23 | |
24 | printf("USAGE: %s <file> [-o, -c]\n", argv[0]); |
25 | return 1; |
26 | |
27 | } else if(stat(argv[1], &file_stat)) { |
28 | |
29 | if(errno == ENOENT) |
30 | printf("provided file does not exist.\n"); |
31 | else if(errno == EACCES) |
32 | printf("improper permissions to read from file.\n"); |
33 | else if(errno == ENAMETOOLONG) |
34 | printf("provided path is too long.\n"); |
35 | else if(errno == ENOTDIR) |
36 | printf("provided path contains a non-existant directory.\n"); |
37 | else if(errno == EOVERFLOW) |
38 | printf("provided file cannot be properly contained into a stat buf.\n"); |
39 | else if(errno == ELOOP) |
40 | printf("provided file points to an irresolvable symlink chain.\n"); |
41 | |
42 | return errno; |
43 | } |
44 | |
45 | printf("file size in bytes: %llu\n", file_stat.st_size); |
46 | |
47 | while(argc_decr > 2) { |
48 | |
49 | if(!strncmp(argv[argc_decr - 1], "-o", 5)) { |
50 | |
51 | if((file_pd = getpwuid(file_stat.st_uid)) != NULL) |
52 | printf("file owned by user %s.\n", file_pd->pw_name); |
53 | |
54 | else |
55 | printf("file owned by uid %d.\n", file_stat.st_uid); |
56 | |
57 | } else if(!strncmp(argv[argc_decr - 1], "-t", 5)) { |
58 | |
59 | printf("file is a "); |
60 | ft = &(file_stat.st_mode); |
61 | |
62 | if (S_ISBLK(*ft)) printf("block device.\n"); |
63 | else if(S_ISCHR(*ft)) printf("character device.\n"); |
64 | else if(S_ISFIFO(*ft)) printf("fifo pipe.\n"); |
65 | else if(S_ISREG(*ft)) printf("regular file.\n"); |
66 | else if(S_ISDIR(*ft)) printf("directory.\n"); |
67 | else if(S_ISLNK(*ft)) printf("symbolic link.\n"); |
68 | |
69 | |
70 | } else { |
71 | |
72 | printf("provided argument is invalid, must be '-t' or '-o'.\n"); |
73 | return 1; |
74 | } |
75 | |
76 | argc_decr--; |
77 | } |
78 | |
79 | return 0; |
80 | } |