File: tst-reallocarray.c

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, experimental, sid
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (118 lines) | stat: -rw-r--r-- 2,699 bytes parent folder | download | duplicates (4)
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
/* Test for reallocarray.
   Copyright (C) 2017-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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 <malloc.h>
#include <string.h>
#include <support/check.h>

static int
do_test (void)
{
  void *ptr = NULL;
  void *ptr2 = NULL;
  unsigned char *c;
  size_t i;
  int ok;
  const size_t max = ~(size_t)0;
  size_t a, b;

  /* Test overflow detection.  */
  errno = 0;
  ptr = reallocarray (NULL, max, 2);
  TEST_VERIFY (!ptr);
  TEST_VERIFY (errno == ENOMEM);

  errno = 0;
  ptr = reallocarray (NULL, 2, max);
  TEST_VERIFY (!ptr);
  TEST_VERIFY (errno == ENOMEM);

  a = 65537;
  b = max/65537 + 1;
  errno = 0;
  ptr = reallocarray (NULL, a, b);
  TEST_VERIFY (!ptr);
  TEST_VERIFY (errno == ENOMEM);

  errno = 0;
  ptr = reallocarray (NULL, b, a);
  TEST_VERIFY (!ptr);
  TEST_VERIFY (errno == ENOMEM);

  /* Test realloc-like behavior.  */
  /* Allocate memory like malloc.  */
  ptr = reallocarray (NULL, 10, 2);
  TEST_VERIFY_EXIT (ptr);
  TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 10*2);

  memset (ptr, 0xAF, 10*2);

  /* Enlarge buffer.   */
  ptr2 = reallocarray (ptr, 20, 2);
  TEST_VERIFY (ptr2);
  if (ptr2)
    ptr = ptr2;
  TEST_VERIFY (malloc_usable_size (ptr) >= 20*2);

  c = ptr;
  ok = 1;
  for (i = 0; i < 10*2; ++i)
    {
      if (c[i] != 0xAF)
        ok = 0;
    }
  TEST_VERIFY (ok);

  /* Decrease buffer size.  */
  ptr2 = reallocarray (ptr, 5, 3);
  TEST_VERIFY (ptr2);
  if (ptr2)
    ptr = ptr2;
  TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 5*3);

  c = ptr;
  ok = 1;
  for (i = 0; i < 5*3; ++i)
    {
      if (c[i] != 0xAF)
        ok = 0;
    }
  TEST_VERIFY (ok);

  /* Overflow should leave buffer untouched.  */
  errno = 0;
  ptr2 = reallocarray (ptr, 2, ~(size_t)0);
  TEST_VERIFY (!ptr2);
  TEST_VERIFY (errno == ENOMEM);

  c = ptr;
  ok = 1;
  for (i = 0; i < 5*3; ++i)
    {
      if (c[i] != 0xAF)
        ok = 0;
    }
  TEST_VERIFY (ok);

  free (ptr);

  return 0;
}

#include <support/test-driver.c>