| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #ifndef _SYS_SYSMACROS_H |
| 21 | #define _SYS_SYSMACROS_H 1 |
| 22 | |
| 23 | #include <features.h> |
| 24 | |
| 25 | /* If the compiler does not know long long it is out of luck. We are |
| 26 | not going to hack weird hacks to support the dev_t representation |
| 27 | they need. */ |
| 28 | #if 1 /*def __GLIBC_HAVE_LONG_LONG uClibc note: always enable */ |
| 29 | __extension__ |
| 30 | static __inline unsigned int gnu_dev_major (unsigned long long int __dev) |
| 31 | __THROW; |
| 32 | __extension__ |
| 33 | static __inline unsigned int gnu_dev_minor (unsigned long long int __dev) |
| 34 | __THROW; |
| 35 | __extension__ |
| 36 | static __inline unsigned long long int gnu_dev_makedev (unsigned int __major, |
| 37 | unsigned int __minor) |
| 38 | __THROW; |
| 39 | |
| 40 | # if defined __GNUC__ && __GNUC__ >= 2 |
| 41 | __extension__ static __inline unsigned int |
| 42 | __NTH (gnu_dev_major (unsigned long long int __dev)) |
| 43 | { |
| 44 | return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff); |
| 45 | } |
| 46 | |
| 47 | __extension__ static __inline unsigned int |
| 48 | __NTH (gnu_dev_minor (unsigned long long int __dev)) |
| 49 | { |
| 50 | return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); |
| 51 | } |
| 52 | |
| 53 | __extension__ static __inline unsigned long long int |
| 54 | __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor)) |
| 55 | { |
| 56 | return ((__minor & 0xff) | ((__major & 0xfff) << 8) |
| 57 | | (((unsigned long long int) (__minor & ~0xff)) << 12) |
| 58 | | (((unsigned long long int) (__major & ~0xfff)) << 32)); |
| 59 | } |
| 60 | # endif |
| 61 | |
| 62 | |
| 63 | /* Access the functions with their traditional names. */ |
| 64 | # define major(dev) gnu_dev_major (dev) |
| 65 | # define minor(dev) gnu_dev_minor (dev) |
| 66 | # define makedev(maj, min) gnu_dev_makedev (maj, min) |
| 67 | #endif |
| 68 | |
| 69 | #endif /* sys/sysmacros.h */ |