support/tst-support_blob_repeat.c

   1 /* Tests for <support/blob_repeat.h>
   2    Copyright (C) 2018-2020 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 <stdio.h>
  20 #include <support/blob_repeat.h>
  21 #include <support/check.h>
  22
  23 static int
  24 do_test (void)
  25 {
  26   struct support_blob_repeat repeat
  27     = support_blob_repeat_allocate ("5", 1, 5);
  28   TEST_COMPARE_BLOB (repeat.start, repeat.size, "55555", 5);
  29   support_blob_repeat_free (&repeat);
  30
  31   repeat = support_blob_repeat_allocate ("ABC", 3, 3);
  32   TEST_COMPARE_BLOB (repeat.start, repeat.size, "ABCABCABC", 9);
  33   support_blob_repeat_free (&repeat);
  34
  35   repeat = support_blob_repeat_allocate ("abc", 4, 3);
  36   TEST_COMPARE_BLOB (repeat.start, repeat.size, "abc\0abc\0abc", 12);
  37   support_blob_repeat_free (&repeat);
  38
  39   size_t gigabyte = 1U << 30;
  40   repeat = support_blob_repeat_allocate ("X", 1, gigabyte + 1);
  41   if (repeat.start == NULL)
  42     puts ("warning: not enough memory for 1 GiB mapping");
  43   else
  44     {
  45       TEST_COMPARE (repeat.size, gigabyte + 1);
  46       {
  47         unsigned char *p = repeat.start;
  48         for (size_t i = 0; i < gigabyte + 1; ++i)
  49           if (p[i] != 'X')
  50             FAIL_EXIT1 ("invalid byte 0x%02x at %zu", p[i], i);
  51
  52         /* Check that there is no sharing across the mapping.  */
  53         p[0] = 'Y';
  54         p[1U << 24] = 'Z';
  55         for (size_t i = 0; i < gigabyte + 1; ++i)
  56           if (i == 0)
  57             TEST_COMPARE (p[i], 'Y');
  58           else if (i == 1U << 24)
  59             TEST_COMPARE (p[i], 'Z');
  60           else if (p[i] != 'X')
  61             FAIL_EXIT1 ("invalid byte 0x%02x at %zu", p[i], i);
  62       }
  63     }
  64   support_blob_repeat_free (&repeat);
  65
  66   repeat = support_blob_repeat_allocate ("012345678", 9, 10 * 1000 * 1000);
  67   if (repeat.start == NULL)
  68     puts ("warning: not enough memory for large mapping");
  69   else
  70     {
  71       unsigned char *p = repeat.start;
  72       for (int i = 0; i < 10 * 1000 * 1000; ++i)
  73         for (int j = 0; j <= 8; ++j)
  74           if (p[i * 9 + j] != '0' + j)
  75             {
  76               printf ("error: element %d index %d\n", i, j);
  77               TEST_COMPARE (p[i * 9 + j], '0' + j);
  78             }
  79     }
  80   support_blob_repeat_free (&repeat);
  81
  82   return 0;
  83 }
  84
  85 #include <support/test-driver.c>