source: MondoRescue/branches/3.3/mindi-busybox/util-linux/fatattr.c@ 3621

/* 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, uint32_t)
# define FAT_IOCTL_SET_ATTRIBUTES        _IOW('r', 0x11, uint32_t)
#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[] ALIGN1 = "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;
}