sysdeps/unix/sysv/linux/makedev.c

   1 /* Definitions of functions to access `dev_t' values.
   2    Copyright (C) 2003 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
  23 gnu_dev_major (unsigned long long int dev)
  24 {
  25   return ((dev >> 8) & 0xfff) | ((unsigned int) (dev >> 32) & ~0xfff);
  26 }
  27
  28 unsigned int
  29 gnu_dev_minor (unsigned long long int dev)
  30 {
  31   return (dev & 0xff) | ((unsigned int) (dev >> 12) & ~0xff);
  32 }
  33
  34 unsigned long long int
  35 gnu_dev_makedev (unsigned int major, unsigned int minor)
  36 {
  37   return ((minor & 0xff) | ((major & 0xfff) << 8)
  38           | (((unsigned long long int) (minor & ~0xff)) << 12)
  39           | (((unsigned long long int) (major & ~0xfff)) << 32));
  40 }