summaryrefslogtreecommitdiff
path: root/malloc/tst-calloc.c
blob: f014ea223c1f3abb4c9eef69f3556753fd375acc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
/* Copyright (C) 2000-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <error.h>
#include <limits.h>
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>


/* Number of samples per size.  */
#define N 50000


static void
fixed_test (int size)
{
  char *ptrs[N];
  int i;

  for (i = 0; i < N; ++i)
    {
      int j;

      ptrs[i] = (char *) calloc (1, size);

      if (ptrs[i] == NULL)
	break;

      for (j = 0; j < size; ++j)
	{
	  if (ptrs[i][j] != '\0')
	    error (EXIT_FAILURE, 0,
		   "byte not cleared (size %d, element %d, byte %d)",
		   size, i, j);
	  ptrs[i][j] = '\xff';
	}
    }

  while (i-- > 0)
    free (ptrs[i]);
}


static void
random_test (void)
{
  char *ptrs[N];
  int i;

  for (i = 0; i < N; ++i)
    {
      int j;
      int n = 1 + random () % 10;
      int elem = 1 + random () % 100;
      int size = n * elem;

      ptrs[i] = (char *) calloc (n, elem);

      if (ptrs[i] == NULL)
	break;

      for (j = 0; j < size; ++j)
	{
	  if (ptrs[i][j] != '\0')
	    error (EXIT_FAILURE, 0,
		   "byte not cleared (size %d, element %d, byte %d)",
		   size, i, j);
	  ptrs[i][j] = '\xff';
	}
    }

  while (i-- > 0)
    free (ptrs[i]);
}


static void
null_test (void)
{
  /* If the size is 0 the result is implementation defined.  Just make
     sure the program doesn't crash.  */
  calloc (0, 0);
  calloc (0, UINT_MAX);
  calloc (UINT_MAX, 0);
  calloc (0, ~((size_t) 0));
  calloc (~((size_t) 0), 0);
}


static int
do_test (void)
{
  /* We are allocating blocks with `calloc' and check whether every
     block is completely cleared.  We first try this for some fixed
     times and then with random size.  */
  fixed_test (15);
  fixed_test (5);
  fixed_test (17);
  fixed_test (6);
  fixed_test (31);
  fixed_test (96);

  random_test ();

  null_test ();

  return 0;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"