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