1 /* vi: set sw=4 ts=4: */
2 /*
3 * Display or change file attributes on a fat file system
4 *
5 * Copyright 2005 H. Peter Anvin
6 * Busybox'ed (2014) by Pascal Bellard <pascal.bellard@ads-lu.com>
7 *
8 * This file can be redistributed under the terms of the GNU General
9 * Public License
10 */
11 //config:config FATATTR
12 //config: bool "fatattr (1.9 kb)"
13 //config: default y
14 //config: help
15 //config: fatattr lists or changes the file attributes on a fat file system.
16
17 //applet:IF_FATATTR(APPLET_NOEXEC(fatattr, fatattr, BB_DIR_BIN, BB_SUID_DROP, fatattr))
18
19 //kbuild:lib-$(CONFIG_FATATTR) += fatattr.o
20
21 //usage:#define fatattr_trivial_usage
22 //usage: "[-+rhsvda] FILE..."
23 //usage:#define fatattr_full_usage "\n\n"
24 //usage: "Change file attributes on FAT filesystem\n"
25 //usage: "\n - Clear attributes"
26 //usage: "\n + Set attributes"
27 //usage: "\n r Read only"
28 //usage: "\n h Hidden"
29 //usage: "\n s System"
30 //usage: "\n v Volume label"
31 //usage: "\n d Directory"
32 //usage: "\n a Archive"
33
34 #include "libbb.h"
35 /* linux/msdos_fs.h says: */
36 #ifndef FAT_IOCTL_GET_ATTRIBUTES
37 # define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, uint32_t)
38 # define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, uint32_t)
39 #endif
40
41 /* Currently supports only the FAT flags, not the NTFS ones.
42 * Extra space at the end is a hack to print space separator in file listing.
43 * Let's hope no one ever passes space as an option char :)
44 */
45 static const char bit_to_char[] ALIGN1 = "rhsvda67 ";
46
get_flag(char c)47 static inline unsigned long get_flag(char c)
48 {
49 const char *fp = strchr(bit_to_char, c);
50 if (!fp)
51 bb_error_msg_and_die("invalid character '%c'", c);
52 return 1 << (fp - bit_to_char);
53 }
54
decode_arg(const char * arg)55 static unsigned decode_arg(const char *arg)
56 {
57 unsigned fl = 0;
58 while (*++arg)
59 fl |= get_flag(*arg);
60 return fl;
61 }
62
63 int fatattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
fatattr_main(int argc UNUSED_PARAM,char ** argv)64 int fatattr_main(int argc UNUSED_PARAM, char **argv)
65 {
66 unsigned set_mask = 0;
67 unsigned clear_mask = 0;
68
69 for (;;) {
70 unsigned fl;
71 char *arg = *++argv;
72
73 if (!arg)
74 bb_show_usage();
75 if (arg[0] != '-' && arg[0] != '+')
76 break;
77 fl = decode_arg(arg);
78 if (arg[0] == '+')
79 set_mask |= fl;
80 else
81 clear_mask |= fl;
82 }
83
84 do {
85 int fd, i;
86 uint32_t attr;
87
88 fd = xopen(*argv, O_RDONLY);
89 xioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr);
90 attr = (attr | set_mask) & ~clear_mask;
91 if (set_mask | clear_mask)
92 xioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
93 else {
94 for (i = 0; bit_to_char[i]; i++) {
95 bb_putchar((attr & 1) ? bit_to_char[i] : ' ');
96 attr >>= 1;
97 }
98 puts(*argv);
99 }
100 close(fd);
101 } while (*++argv);
102
103 return EXIT_SUCCESS;
104 }
105