misc/tst-makedev.c

   1 /* Tests of functions to access `dev_t' values.
   2    Copyright (C) 2016-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <sys/sysmacros.h>
  21 #include <stdio.h>
  22 #include <inttypes.h>
  23
  24 /* Confirm that makedev (major (d), minor (d)) == d.  */
  25 static int
  26 do_test_split_combine (dev_t d1)
  27 {
  28   unsigned int maj = major (d1);
  29   unsigned int min = minor (d1);
  30   dev_t d2 = makedev (maj, min);
  31   if (d1 != d2)
  32     {
  33       printf ("FAIL: %016" PRIx64 " != %016" PRIx64 " (maj %08x min %08x)\n",
  34               (uint64_t)d2, (uint64_t)d1, maj, min);
  35       return 1;
  36     }
  37   else
  38     return 0;
  39 }
  40
  41 /* Confirm that major (makedev (maj, min)) == maj and
  42    minor (makedev (maj, min)) == min.  */
  43 static int
  44 do_test_combine_split (unsigned int maj1, unsigned int min1)
  45 {
  46   dev_t d = makedev (maj1, min1);
  47   unsigned int maj2 = major (d);
  48   unsigned int min2 = minor (d);
  49   if (maj1 != maj2 && min1 != min2)
  50     {
  51       printf ("FAIL: %08x != %08x, %08x != %08x (dev %016" PRIx64 ")\n",
  52               maj2, maj1, min2, min1, (uint64_t)d);
  53       return 1;
  54     }
  55   else if (maj1 != maj2)
  56     {
  57       printf ("FAIL: %08x != %08x, %08x == %08x (dev %016" PRIx64 ")\n",
  58               maj2, maj1, min2, min1, (uint64_t)d);
  59       return 1;
  60     }
  61   else if (min1 != min2)
  62     {
  63       printf ("FAIL: %08x == %08x, %08x != %08x (dev %016" PRIx64 ")\n",
  64               maj2, maj1, min2, min1, (uint64_t)d);
  65       return 1;
  66     }
  67   else
  68     return 0;
  69 }
  70
  71 static int
  72 do_test (void)
  73 {
  74   dev_t d;
  75   unsigned int maj, min;
  76   int status = 0;
  77
  78   /* Test the traditional range (16-bit dev_t, 8-bit each maj/min)
  79      exhaustively.  */
  80   for (d = 0; d <= 0xFFFF; d++)
  81     status |= do_test_split_combine (d);
  82
  83   for (maj = 0; maj <= 0xFF; maj++)
  84     for (min = 0; min <= 0xFF; min++)
  85       status |= do_test_combine_split (maj, min);
  86
  87   /* Test glibc's expanded range (64-bit dev_t, 32-bit each maj/min).
  88      Exhaustive testing would take much too long, instead we shift a
  89      pair of 1-bits over each range.  */
  90   {
  91     unsigned int a, b;
  92     for (a = 0; a <= 63; a++)
  93       do_test_split_combine (((dev_t) 0x03) << a);
  94
  95     for (a = 0; a < 31; a++)
  96       for (b = 0; b <= 31; b++)
  97         do_test_combine_split (0x03u << a, 0x03u << b);
  98   }
  99
 100   return status;
 101 }
 102
 103 #define TEST_FUNCTION do_test ()
 104 #include "../test-skeleton.c"