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fatattr: new applet

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function                                             old     new   delta
fatattr_main                                           -     281    +281
packed_usage                                       29821   29871     +50
bit_to_char                                            -      10     +10
applet_names                                        2472    2480      +8
applet_main                                         1436    1440      +4
applet_nameofs                                       718     720      +2
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(add/remove: 3/0 grow/shrink: 4/0 up/down: 355/0)             Total: 355 bytes

Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Pascal Bellard 2014-06-30 13:06:39 +02:00 committed by Denys Vlasenko
parent a9dc7c2f59
commit d3633b7e9c
1 changed files with 104 additions and 0 deletions
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104
util-linux/fatattr.c Normal file
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/* 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;
}