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Commit | Line | Data |
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a904c8c2 | 1 | /* |
2 | * $Id$ | |
3 | * adds devmode and devgid to usbfs in fstab | |
4 | * | |
5 | */ | |
6 | #include <sys/types.h> | |
7 | #include <sys/mman.h> | |
8 | #include <sys/stat.h> | |
9 | #include <unistd.h> | |
10 | #include <fcntl.h> | |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
13 | #include <signal.h> | |
14 | ||
15 | void eputs(const char *msg) | |
16 | { | |
17 | write(2, msg, strlen(msg)); | |
18 | } | |
19 | ||
20 | int main() | |
21 | { | |
22 | char *name = "/etc/fstab"; | |
23 | char *backup_name = "/etc/fstab.bak"; | |
24 | char *add = ",devmode=0664,devgid=78"; | |
25 | ||
26 | char *old; | |
27 | int i, fd; | |
28 | int old_sz; | |
29 | struct stat st; | |
30 | ||
31 | eputs("Updating /etc/fstab..."); | |
32 | fd = open(name, O_RDONLY); | |
33 | if (fd < 0) { | |
34 | eputs("\nError: can't open file\n"); | |
35 | return 1; | |
36 | } | |
37 | fstat(fd, &st); | |
38 | old = (char *) malloc(st.st_size); | |
39 | read(fd, old, st.st_size); | |
40 | close(fd); | |
41 | old_sz = st.st_size; | |
42 | ||
43 | fd = open(backup_name, O_WRONLY|O_CREAT|O_TRUNC, 0600); | |
44 | if (fd < 0) { | |
45 | eputs("\nError: can't make backup\n"); | |
46 | return 2; | |
47 | } | |
48 | write(fd, old, old_sz); | |
49 | close(fd); | |
50 | ||
51 | // find usbfs | |
52 | for (i = 0; i < old_sz; i++) { | |
53 | if ( old[i] == 'u' && old[i+1] == 's' && old[i+2] == 'b' | |
54 | && old[i+3] == 'f' && old[i+4] == 's') | |
55 | break; | |
56 | } | |
57 | // find defau(lts) | |
58 | for (;i < old_sz; i++) { | |
59 | if ( old[i] == 'd' && old[i+1] == 'e' && old[i+2] == 'f' && old[i+3] == 'a' && old[i+4] == 'u' ) | |
60 | break; | |
61 | } | |
62 | // find first space | |
63 | for (;i < old_sz; i++) { | |
64 | if ( old[i] == ' ' || old[i] == '\t' ) | |
65 | break; | |
66 | } | |
67 | if ( i >= old_sz ) { | |
68 | eputs("\nError: can't find correct usbfs entry\n"); | |
69 | return 3; | |
70 | } | |
71 | ||
72 | fd = open(name, O_WRONLY|O_CREAT|O_TRUNC); | |
73 | if (fd < 0) { | |
74 | eputs("\nError: can't open file for writing\n"); | |
75 | return 4; | |
76 | } | |
77 | write(fd, old, i); | |
78 | write(fd, add, strlen(add)); | |
79 | write(fd, old + i, old_sz - i); | |
80 | close(fd); | |
81 | eputs("OK\n"); | |
82 | ||
83 | return 0; | |
84 | } | |
85 |