[3621] | 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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