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| -rw-r--r-- | util-linux/fatattr.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/util-linux/fatattr.c b/util-linux/fatattr.c new file mode 100644 index 000000000..0f8d63268 --- /dev/null +++ b/util-linux/fatattr.c @@ -0,0 +1,104 @@ +/* vi: set sw=4 ts=4: */ +/* + * Display or change file attributes on a fat file system + * + * Copyright 2005 H. Peter Anvin + * Busybox'ed (2014) by Pascal Bellard <pascal.bellard@ads-lu.com> + * + * This file can be redistributed under the terms of the GNU General + * Public License + */ +//config:config FATATTR +//config: bool "fatattr" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: fatattr lists or changes the file attributes on a fat file system. + +//applet:IF_FATATTR(APPLET(fatattr, BB_DIR_BIN, BB_SUID_DROP)) +//kbuild:lib-$(CONFIG_FATATTR) += fatattr.o + +//usage:#define fatattr_trivial_usage +//usage: "[-+rhsvda] FILE..." +//usage:#define fatattr_full_usage "\n\n" +//usage: "Change file attributes on FAT filesystem\n" +//usage: "\n - Clear attributes" +//usage: "\n + Set attributes" +//usage: "\n r Read only" +//usage: "\n h Hidden" +//usage: "\n s System" +//usage: "\n v Volume label" +//usage: "\n d Directory" +//usage: "\n a Archive" + +#include "libbb.h" +/* linux/msdos_fs.h says: */ +#ifndef FAT_IOCTL_GET_ATTRIBUTES +# define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) +# define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) +#endif + +/* Currently supports only the FAT flags, not the NTFS ones. + * Extra space at the end is a hack to print space separator in file listing. + * Let's hope no one ever passes space as an option char :) + */ +static const char bit_to_char[] = "rhsvda67 "; + +static inline unsigned long get_flag(char c) +{ + const char *fp = strchr(bit_to_char, c); + if (!fp) + bb_error_msg_and_die("invalid character '%c'", c); + return 1 << (fp - bit_to_char); +} + +static unsigned decode_arg(const char *arg) +{ + unsigned fl = 0; + while (*++arg) + fl |= get_flag(*arg); + return fl; +} + +int fatattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int fatattr_main(int argc UNUSED_PARAM, char **argv) +{ + unsigned set_mask = 0; + unsigned clear_mask = 0; + + for (;;) { + unsigned fl; + char *arg = *++argv; + + if (!arg) + bb_show_usage(); + if (arg[0] != '-' && arg[0] != '+') + break; + fl = decode_arg(arg); + if (arg[0] == '+') + set_mask |= fl; + else + clear_mask |= fl; + } + + do { + int fd, i; + uint32_t attr; + + fd = xopen(*argv, O_RDONLY); + xioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr); + attr = (attr | set_mask) & ~clear_mask; + if (set_mask | clear_mask) + xioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr); + else { + for (i = 0; bit_to_char[i]; i++) { + bb_putchar((attr & 1) ? bit_to_char[i] : ' '); + attr >>= 1; + } + puts(*argv); + } + close(fd); + } while (*++argv); + + return EXIT_SUCCESS; +} |