1 /* Definitions of functions to access `dev_t' values.
2 Copyright (C) 2003-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include <endian.h>
20 #include <sys/sysmacros.h>
21
22 unsigned int
gnu_dev_major(unsigned long long int dev)23 gnu_dev_major (unsigned long long int dev)
24 {
25 return ((dev >> 8) & 0xfff) | ((unsigned int) (dev >> 32) & ~0xfff);
26 }
libc_hidden_def(gnu_dev_major)27 libc_hidden_def(gnu_dev_major)
28
29 unsigned int
30 gnu_dev_minor (unsigned long long int dev)
31 {
32 return (dev & 0xff) | ((unsigned int) (dev >> 12) & ~0xff);
33 }
libc_hidden_def(gnu_dev_minor)34 libc_hidden_def(gnu_dev_minor)
35
36 unsigned long long int
37 gnu_dev_makedev (unsigned int major, unsigned int minor)
38 {
39 return ((minor & 0xff) | ((major & 0xfff) << 8)
40 | (((unsigned long long int) (minor & ~0xff)) << 12)
41 | (((unsigned long long int) (major & ~0xfff)) << 32));
42 }
43