2 * Copyright (C) 2008-2009 Free Software Foundation
3 * Written by Simon Josefsson
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.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "signature.h"
23 SIGNATURE_CHECK (memcmp, int, (void const *, void const *, size_t));
28 #include "zerosize-ptr.h"
30 #define ASSERT(expr) \
35 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
45 /* Test equal / not equal distinction. */
46 ASSERT (memcmp (zerosize_ptr (), zerosize_ptr (), 0) == 0);
47 ASSERT (memcmp ("foo", "foobar", 2) == 0);
48 ASSERT (memcmp ("foo", "foobar", 3) == 0);
49 ASSERT (memcmp ("foo", "foobar", 4) != 0);
50 ASSERT (memcmp ("foo", "bar", 1) != 0);
51 ASSERT (memcmp ("foo", "bar", 3) != 0);
53 /* Test less / equal / greater distinction. */
54 ASSERT (memcmp ("foo", "moo", 4) < 0);
55 ASSERT (memcmp ("moo", "foo", 4) > 0);
56 ASSERT (memcmp ("oomph", "oops", 3) < 0);
57 ASSERT (memcmp ("oops", "oomph", 3) > 0);
58 ASSERT (memcmp ("foo", "foobar", 4) < 0);
59 ASSERT (memcmp ("foobar", "foo", 4) > 0);
61 /* Some old versions of memcmp were not 8-bit clean. */
62 ASSERT (memcmp ("\100", "\201", 1) < 0);
63 ASSERT (memcmp ("\201", "\100", 1) > 0);
64 ASSERT (memcmp ("\200", "\201", 1) < 0);
65 ASSERT (memcmp ("\201", "\200", 1) > 0);
67 /* The Next x86 OpenStep bug shows up only when comparing 16 bytes
68 or more and with at least one buffer not starting on a 4-byte boundary.
69 William Lewis provided this test program. */
74 for (i = 0; i < 4; i++)
78 strcpy (a, "--------01111111");
79 strcpy (b, "--------10000000");
80 ASSERT (memcmp (a, b, 16) < 0);