tests/test-strnlen.c

   1 /*
   2  * Copyright (C) 2010-2020 Free Software Foundation, Inc.
   3  * Written by Eric Blake
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <string.h>
  21
  22 #include "signature.h"
  23 SIGNATURE_CHECK (strnlen, size_t, (char const *, size_t));
  24
  25 #include <stdlib.h>
  26
  27 #include "zerosize-ptr.h"
  28 #include "macros.h"
  29
  30 int
  31 main (void)
  32 {
  33   size_t i;
  34   char *page_boundary = (char *) zerosize_ptr ();
  35   if (!page_boundary)
  36     {
  37       page_boundary = malloc (0x1000);
  38       ASSERT (page_boundary);
  39       page_boundary += 0x1000;
  40     }
  41
  42   /* Basic behavior tests.  */
  43   ASSERT (strnlen ("a", 0) == 0);
  44   ASSERT (strnlen ("a", 1) == 1);
  45   ASSERT (strnlen ("a", 2) == 1);
  46   ASSERT (strnlen ("", 0x100000) == 0);
  47
  48   /* Memory fence and alignment testing.  */
  49   for (i = 0; i < 512; i++)
  50     {
  51       char *start = page_boundary - i;
  52       size_t j = i;
  53       memset (start, 'x', i);
  54       do
  55         {
  56           if (i != j)
  57             {
  58               start[j] = 0;
  59               ASSERT (strnlen (start, i + j) == j);
  60             }
  61           ASSERT (strnlen (start, i) == j);
  62           ASSERT (strnlen (start, j) == j);
  63         }
  64       while (j--);
  65     }
  66
  67   return 0;
  68 }