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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Display or change file attributes on a fat file system
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*
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* Copyright 2005 H. Peter Anvin
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* Busybox'ed (2014) by Pascal Bellard <pascal.bellard@ads-lu.com>
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*
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* This file can be redistributed under the terms of the GNU General
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* Public License
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*/
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//config:config FATATTR
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//config: bool "fatattr (2.2 kb)"
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//config: default y
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//config: help
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//config: fatattr lists or changes the file attributes on a fat file system.
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//applet:IF_FATATTR(APPLET_NOEXEC(fatattr, fatattr, BB_DIR_BIN, BB_SUID_DROP, fatattr))
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//kbuild:lib-$(CONFIG_FATATTR) += fatattr.o
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//usage:#define fatattr_trivial_usage
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//usage: "[-+rhsvda] FILE..."
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//usage:#define fatattr_full_usage "\n\n"
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//usage: "Change file attributes on FAT filesystem\n"
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//usage: "\n - Clear attributes"
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//usage: "\n + Set attributes"
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//usage: "\n r Read only"
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//usage: "\n h Hidden"
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//usage: "\n s System"
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//usage: "\n v Volume label"
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//usage: "\n d Directory"
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//usage: "\n a Archive"
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#include "libbb.h"
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/* linux/msdos_fs.h says: */
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#ifndef FAT_IOCTL_GET_ATTRIBUTES
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# define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, uint32_t)
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# define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, uint32_t)
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#endif
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/* Currently supports only the FAT flags, not the NTFS ones.
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* Extra space at the end is a hack to print space separator in file listing.
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* Let's hope no one ever passes space as an option char :)
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*/
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static const char bit_to_char[] ALIGN1 = "rhsvda67 ";
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static inline unsigned long get_flag(char c)
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{
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const char *fp = strchr(bit_to_char, c);
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if (!fp)
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bb_error_msg_and_die("invalid character '%c'", c);
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return 1 << (fp - bit_to_char);
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}
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static unsigned decode_arg(const char *arg)
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{
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unsigned fl = 0;
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while (*++arg)
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fl |= get_flag(*arg);
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return fl;
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}
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int fatattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fatattr_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned set_mask = 0;
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unsigned clear_mask = 0;
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for (;;) {
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unsigned fl;
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char *arg = *++argv;
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if (!arg)
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bb_show_usage();
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if (arg[0] != '-' && arg[0] != '+')
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break;
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fl = decode_arg(arg);
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if (arg[0] == '+')
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set_mask |= fl;
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else
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clear_mask |= fl;
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}
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do {
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int fd, i;
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uint32_t attr;
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fd = xopen(*argv, O_RDONLY);
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xioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr);
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attr = (attr | set_mask) & ~clear_mask;
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if (set_mask | clear_mask)
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xioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
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else {
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for (i = 0; bit_to_char[i]; i++) {
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bb_putchar((attr & 1) ? bit_to_char[i] : ' ');
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attr >>= 1;
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}
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puts(*argv);
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}
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close(fd);
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} while (*++argv);
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return EXIT_SUCCESS;
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}
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