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#ident "$Id$"
/* ----------------------------------------------------------------------- *
*
* Copyright 2005 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* fatattr.c
*
* Display or change attributes on a FAT filesystem, similar to the
* DOS attrib command.
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include <sysexits.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/msdos_fs.h>
#ifndef FAT_IOCTL_GET_ATTRIBUTES
# define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
#endif
#ifndef FAT_IOCTL_SET_ATTRIBUTES
# define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)
#endif
const char *program;
/* Currently supports only the FAT flags, not the NTFS ones */
const char bit_to_char[] = "rhsvda67";
static int
chattr(const char *file, uint32_t s_attr, uint32_t c_attr)
{
int fd = -1;
uint32_t attr, nattr;
int e;
fd = open(file, O_RDONLY);
if ( fd < 0 )
goto err;
if ( ioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr) )
goto err;
nattr = (attr & ~c_attr) | s_attr;
if ( nattr != attr ) {
if ( ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &nattr) )
goto err;
}
close(fd);
return 0;
err:
e = errno;
if ( fd >= 0 )
close(fd);
errno = e;
return -1;
}
static int
lsattr(const char *file)
{
int fd = -1;
uint32_t attr;
int i, e;
fd = open(file, O_RDONLY);
if ( fd < 0 )
goto err;
if ( ioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr) )
goto err;
close(fd);
for ( i = 0 ; bit_to_char[i] ; i++ ) {
putchar( (attr & 1) ? bit_to_char[i] : ' ' );
attr >>= 1;
}
putchar(' ');
puts(file);
return 0;
err:
e = errno;
if ( fd >= 0 )
close(fd);
errno = e;
return -1;
}
static uint32_t
parse_attr(const char *attrs)
{
uint32_t attr = 0;
const char *p;
while ( *attrs ) {
p = strchr(bit_to_char, *attrs);
if ( !p ) {
fprintf(stderr, "%s: unknown attribute: '%c'\n", program, *attrs);
exit(EX_USAGE);
}
attr |= (uint32_t)1 << (p-bit_to_char);
attrs++;
}
return attr;
}
static void __attribute__((noreturn)) usage(void)
{
fprintf(stderr, "Usage: %s [-+%s] files...\n", program, bit_to_char);
exit(EX_USAGE);
}
int main(int argc, char *argv[])
{
uint32_t s_attr = 0; /* Attributes to set */
uint32_t c_attr = 0; /* Attributes to clear */
int i;
int files = 0; /* Files processed */
int e;
program = argv[0];
for ( i = 1 ; i < argc ; i++ ) {
if ( argv[i][0] == '-' )
c_attr |= parse_attr(argv[i]+1);
else if ( argv[i][0] == '+' )
s_attr |= parse_attr(argv[i]+1);
else {
e = 0;
if ( c_attr | s_attr )
e = chattr(argv[i], s_attr, c_attr);
else
e = lsattr(argv[i]);
if ( e ) {
perror(argv[i]);
return EX_DATAERR;
}
files++;
}
}
if ( !files )
usage();
return 0;
}
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