1 /* Definitions of macros to access `dev_t' values.
2 Copyright (C) 1996, 1997, 1999, 2003, 2004 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 #ifndef _SYS_SYSMACROS_H
20 #define _SYS_SYSMACROS_H 1
21
22 #include <features.h>
23
24 /* If the compiler does not know long long it is out of luck. We are
25 not going to hack weird hacks to support the dev_t representation
26 they need. */
27 #if 1 /*def __GLIBC_HAVE_LONG_LONG uClibc note: always enable */
28 __extension__
29 static __inline unsigned int gnu_dev_major (unsigned long long int __dev)
30 __THROW;
31 __extension__
32 static __inline unsigned int gnu_dev_minor (unsigned long long int __dev)
33 __THROW;
34 __extension__
35 static __inline unsigned long long int gnu_dev_makedev (unsigned int __major,
36 unsigned int __minor)
37 __THROW;
38
39 # if defined __GNUC__ && __GNUC__ >= 2
40 __extension__ static __inline unsigned int
__NTH(gnu_dev_major (unsigned long long int __dev))41 __NTH (gnu_dev_major (unsigned long long int __dev))
42 {
43 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
44 }
45
46 __extension__ static __inline unsigned int
__NTH(gnu_dev_minor (unsigned long long int __dev))47 __NTH (gnu_dev_minor (unsigned long long int __dev))
48 {
49 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
50 }
51
52 __extension__ static __inline unsigned long long int
__NTH(gnu_dev_makedev (unsigned int __major,unsigned int __minor))53 __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
54 {
55 return ((__minor & 0xff) | ((__major & 0xfff) << 8)
56 | (((unsigned long long int) (__minor & ~0xff)) << 12)
57 | (((unsigned long long int) (__major & ~0xfff)) << 32));
58 }
59 # endif
60
61
62 /* Access the functions with their traditional names. */
63 # define major(dev) gnu_dev_major (dev)
64 # define minor(dev) gnu_dev_minor (dev)
65 # define makedev(maj, min) gnu_dev_makedev (maj, min)
66 #endif
67
68 #endif /* sys/sysmacros.h */
69